JEE Main Practice Test- 13 - JEE MCQ

# JEE Main Practice Test- 13 - JEE MCQ

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## 75 Questions MCQ Test - JEE Main Practice Test- 13

JEE Main Practice Test- 13 for JEE 2024 is part of JEE preparation. The JEE Main Practice Test- 13 questions and answers have been prepared according to the JEE exam syllabus.The JEE Main Practice Test- 13 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Main Practice Test- 13 below.
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JEE Main Practice Test- 13 - Question 1
JEE Main Practice Test- 13 - Question 2

### If 60a = 3 and 60b = 5 then the value of  equals

Detailed Solution for JEE Main Practice Test- 13 - Question 2

60a = 3 ⇒ a = log603
60b = 5 ⇒ b = log605

JEE Main Practice Test- 13 - Question 3

### The set of values of x satisfying the inequality

Detailed Solution for JEE Main Practice Test- 13 - Question 3

Domain is (- 3, – 2) ∪ (- 1, ∞) ; for x > - 1, LHS is negative & RHS is positive and for - 3 < x < - 2 it is the other way
⇒ x > - 1 is the final answer

JEE Main Practice Test- 13 - Question 4

Given that x + sin y = 2008 and x + 2008 cos y = 2007 where 0 ≤ y ≤ π/2. The value of [x + y], is. (Here [x] denotes greatest integer function)

Detailed Solution for JEE Main Practice Test- 13 - Question 4

x + sin y = 2008

This is possible only if cos y = 0

JEE Main Practice Test- 13 - Question 5

Let p be the statement ' Ram races' and q be the statement 'Ram wins'. Then ~ (p v (~ q)) is

Detailed Solution for JEE Main Practice Test- 13 - Question 5

Given
p : Ram races
q : Ram wins
∴ The statement of given proposition ~ (p v (~ q)) = ~ p ∧ q is "Ram does not race and Ram wins."

JEE Main Practice Test- 13 - Question 6

A vertical pole PS has two marks at Q and R such that portions PQ, PR and PS subtend angles α, β, γ respectively at a point on the ground which is at distance x from the bottom of pole P. If PQ = a, PR = b, PS = c and α + β + γ = 180º, then x2 is equal to

Detailed Solution for JEE Main Practice Test- 13 - Question 6

We have

tan α + tan β + tan γ = tan α tan β tan γ

JEE Main Practice Test- 13 - Question 7

Then the number of subsets of set A×(A ∩ B) which contains exactly 3 elements is

Detailed Solution for JEE Main Practice Test- 13 - Question 7

A = {1, 2, 3, 4, 5, 6} ⇒ n(A) = 6
B = {1, 2} ⇒ n(B) = 2
∴ A ∩ B = {1, 2} ⇒ n(A ∩ B) = 2
So, number of elements in A× (A ∩ B) = 12
∴ Number of subsets containing 3 elements = 12C3 = 220

JEE Main Practice Test- 13 - Question 8

The relation P defined from R to R as a P b ⇔ 1+ ab > 0, for all a,b ∈ R is

JEE Main Practice Test- 13 - Question 9

If x1, x2 & x3 are the three real solutions of the equation

where x1 > x2 > x3 , then

Detailed Solution for JEE Main Practice Test- 13 - Question 9

RHS when simplified is equal x.

JEE Main Practice Test- 13 - Question 10

The variance of 20 observations is 5. If each observation is multiplied by 2 then the new variance of the resulting observations, is

Detailed Solution for JEE Main Practice Test- 13 - Question 10

New, observations are,
2x1 , 2x2 , 2x3 , ......, 2x20
Theirmean,

Now, variance,

JEE Main Practice Test- 13 - Question 11

The last two digits of the number 3400 are

Detailed Solution for JEE Main Practice Test- 13 - Question 11

3400 = 81100 = (1 + 80)100 = 100C0
+ 100C1 80 + ....... + 100C100 80100
⇒ Last two digits are 01

JEE Main Practice Test- 13 - Question 12

There exist positive integers A, B and C with no common factors greater than 1, such that A log2005 + B log2002 = C. The sum (A + B + C) equals

Detailed Solution for JEE Main Practice Test- 13 - Question 12

A log2005 + B log2002 = C

A log 5 + B log 2 = C log 200 = C log(52 23)
= 2C log 5 + 3 C log 2
hence, A = 2C
B = 3C
for no common factor greater than 1, C = 1
∴ A = 2; B = 3 ⇒ A + B + C = 6

JEE Main Practice Test- 13 - Question 13

The expression

Detailed Solution for JEE Main Practice Test- 13 - Question 13

Let
E = sin2α + sin2β + cos2(α + β) + 2 · sin α · sin β · cos(α + β)
= sin2α + sin2β + cos2 (α + β) + [cos (α - β) - cos (α + β)] · cos (α + β)
= sin2α + sin2β +(cos2α - sin2β) = 1. Ans.

Aliter: E = sin2α + sin2β + cos2 (α + β) + 2sin α sin β cos (α + β)
= sin2α - sin2 (α + β) + sin2β + 1 + 2sin α sin β cos (α + β)
= - sin (2α + β) · sin β + sin2 β + 1 + 2sin α sin β cos (α + β)
= 1 - sin β [sin (2α + β) - sin β] + 2 sin α sin β cos (α + β)
= 1 - sin β [2 cos (α + β) sin α] + 2 sin α sin β cos (α + β)
= 1 - 2 sin α sin β cos (α + β) + 2 sin α sin β cos (α + β)
∴ E = 1 ⇒ (A). Ans.

JEE Main Practice Test- 13 - Question 14

Smallest positive x satisfying the equation cos33x + cos35x = 8 cos34x · cos3x is

Detailed Solution for JEE Main Practice Test- 13 - Question 14

cos33x + cos35x = (2 cos 4x cos x)3 = (cos 5x + cos 3x)3
cos33x + cos35x = cos35x + cos33x + 3 cos 5x cos 3x (cos 5x + cos 3x)
⇒ (3 cos 3x · cos 5x) (2 cos 4x · cos x) = 0
⇒ cos x · cos 3x · cos 4x · cos 5x = 0

⇒  smallest + ve values of x is π/10 i.e. 18° Ans.

JEE Main Practice Test- 13 - Question 15

If the quadratic equations 3x2 + ax + 1 = 0 and 2x2 + bx + 1 = 0 have a common root, then the value of the expression 5ab - 2a2 - 3b2 is

Detailed Solution for JEE Main Practice Test- 13 - Question 15

6x2 + 2ax + 2 = 0 and 6x2 + 3bx + 3 = 0 subtracting x (2a – 3b) – 1 = 0

(put in any equation)

2 + b (2a – 3b) + (2a – 3b)2 = 0
4a2 + 5b2 – 12ab + 2ab – 3b2 + 2 = 0
–10ab + 6b2 + 4a2 + 1 = 0
⇒ 5ab –3b2 – 2a2 = 1 ⇒ B

JEE Main Practice Test- 13 - Question 16

Solution set of the inequality

JEE Main Practice Test- 13 - Question 17

The sum to infinity of the series

Detailed Solution for JEE Main Practice Test- 13 - Question 17

JEE Main Practice Test- 13 - Question 18

Consider the sequence 8A + 2B, 6A + B, 4A, 2A – B, ........ Which term of this sequence will have a coefficient of A which is twice the coefficient of B?

Detailed Solution for JEE Main Practice Test- 13 - Question 18

coefficient of A in nth term = 8 + (n – 1)(– 2)
= 10 – 2n
coefficient of B in nth term = 2 + (n – 1)(– 1)
= 3 – n
10 – 2n = 2(3 – n) ⇒ 10 = 6
which is absurd ⇒ none

JEE Main Practice Test- 13 - Question 19

then the value of d is

Detailed Solution for JEE Main Practice Test- 13 - Question 19

JEE Main Practice Test- 13 - Question 20

Let k1, k2 (k1 < k2) be two values of k for which the expression x2 – y2 +kx +1 can be factorised into two real linear factors, then (k2 – k1) is equal to

Detailed Solution for JEE Main Practice Test- 13 - Question 20

x2 + kx + 1 – y2 = 0

for real linear factors 4y2 + 0y + k2 – 4 must be a perfect square.
Hence D = 0 ⇒ 0 – 16(k2 – 4) = 0
∴ k = 2, – 2 ⇒ k1 = – 2 and k2 = 2
k2 – k1 = 2 – (–2) = 4  Ans.

Aliternatively: Comparing x2 – y2 + kx + 1, with Ax2 + 2Hxy + By2 + 2Gx + 2Fy + C;
we get A = 1, B = – 1, H = 0, G = k/2 ,
F = 0, C = 1
Now, using condition,
ABC + 2FGH – AF2 – BG2 – CH2 = 0, we get

⇒ k1 = – 2, k2 = 2
Hence, (k2 – k1) = 2 – (– 2) = 4. Ans.

*Answer can only contain numeric values
JEE Main Practice Test- 13 - Question 21

(Instruction to attempt numerical value (integer) type question: If your answer is 100 write 100 only. Do not write 100.0)

Rolle’s theorem holds for the function f(x) = x3 + bx2 + cx, 1 ≤ x ≤ 2 at the point 4/3, then the value of 100c − 500b must be

Detailed Solution for JEE Main Practice Test- 13 - Question 21

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JEE Main Practice Test- 13 - Question 22

If p, q, r are three distinct real numbers, p ≠ 0 such that x2 + qx + pr = 0 and x2 + rx + pq = 0 have a common root, then the value of p + q + r is .....

Detailed Solution for JEE Main Practice Test- 13 - Question 22

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JEE Main Practice Test- 13 - Question 23

The number of solutions of the equation [2x] - [x + 1] = 2x must be equal to (where [.] denotes the greatest integer function)

Detailed Solution for JEE Main Practice Test- 13 - Question 23

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JEE Main Practice Test- 13 - Question 24

If λ = logx2  then the value of 3216λ must be

Detailed Solution for JEE Main Practice Test- 13 - Question 24

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JEE Main Practice Test- 13 - Question 25

The three angles of a quadrilateral are 60°, 60g and 5π/6, if fourth angle is λ, then the value of λ must be

Detailed Solution for JEE Main Practice Test- 13 - Question 25

JEE Main Practice Test- 13 - Question 26

A special kind of ruler can be used to measure reaction time. You position the 'zero' mark between your friend's first finger and thumb. Without warning, you let go of the the rular, and your friend has to grab it as soon as possible. You can read the reaction time from labelled marks on the ruler. The marks, are separated from each other by 0.01 s intervals of falling time. This means that

JEE Main Practice Test- 13 - Question 27

An object moves to the East across a frictionless surface with constant speed. A person then applies a constant force to the North on the object. What is the resulting path that the object takes?

Detailed Solution for JEE Main Practice Test- 13 - Question 27

Component of velocity along north will increase

JEE Main Practice Test- 13 - Question 28

An aeroplane is flying vertically upwards. When it is at a height of 1000m above the ground and moving at a speed of 367 m/s., a shot is fired at it with a speed of 567 m/s from a point directly below it. What should be the acceleration of aeroplane so that it may escape from being hit ?

Detailed Solution for JEE Main Practice Test- 13 - Question 28

0 = (200)2 – 2(arel) (1000)
or arel = 20 m/s2
So to avoit the hit,
arel > 20 m/s2
or ap > 10 m/s2

JEE Main Practice Test- 13 - Question 29

A jet plane flying at a constant velocity V at a height h = 8 km is being tracked by a radar R located at O directly below the line of flight. If the angle θ is decreasing at the rate of 0.025 rad/s., when θ = 60° the velocity of the plane is :

Detailed Solution for JEE Main Practice Test- 13 - Question 29

JEE Main Practice Test- 13 - Question 30

The figure Shows the acceleration of a particle versus time graph. The particle starts from rest at t = 0. Find the approximate velocity at t = 1s.

Detailed Solution for JEE Main Practice Test- 13 - Question 30

Counting the squares under the graph from t = 0 to t = 1. We get change in velocity.

JEE Main Practice Test- 13 - Question 31

A uniform rope of length L and mass M is placed on a smooth fixed wedge as shown. Both ends of rope are at same horizontal level.The rope is initially released from rest, then the magnitude of initial acceleration of rope is

Detailed Solution for JEE Main Practice Test- 13 - Question 31

h = l1 sin α = l2 sin β
∵ l1 + l2 = L

JEE Main Practice Test- 13 - Question 32

Figure shows two 45° wedges, the smaller wedge w has a horizontal top face. It can slide down the larger wedge W, which is on a horizontal table. All the surfaces are smooth. A mass m sits on the top face of the upper wedge.
Describe qualitatively the motion of the system once it is released from rest.

JEE Main Practice Test- 13 - Question 33

A block of mass m is kept on a rough inclined plane with coefficient of friction µ. The force required to just move the block up is

Detailed Solution for JEE Main Practice Test- 13 - Question 33

N = mg cos q
F = mg sin θ + µN

JEE Main Practice Test- 13 - Question 34

The variation of the vertical speed with time of a ball falling in air is shown below.

During the time from 0 to T, the ball gains kinetic energy and loses gravitational potential energy ΔEP.
Which of the following statements must be correct?

Detailed Solution for JEE Main Practice Test- 13 - Question 34

By COE loss in gravitational P.E. = gain in K.E.

JEE Main Practice Test- 13 - Question 35

One end of a light rope is tied directly to the ceiling. A man initially at rest on the ground starts climbing the rope hand over hand upto a height ℓ.

From the time he starts at rest on the ground to the time he is hanging at rest at a height ℓ, how much work was done on the man by the rope?

Detailed Solution for JEE Main Practice Test- 13 - Question 35

This is subtle, because it is the force that the rope applies to the man that causes him to move upward, against the force of gravity. Nonetheless, as he climbs hand over hand, the hand that is holding the rope is always stationary, while man's body and his free hand move upward. Since the force of the rope is applied to the man's stationary hand, there is no displacement of the object to which the force is applied, and hence no work done.

JEE Main Practice Test- 13 - Question 36

A car of mass 1000 kg moves on a circular road with a speed of 20 m/s. Its direction changes by 90° after travelling 628 m on the road. The centripetal force acting on the car is

Detailed Solution for JEE Main Practice Test- 13 - Question 36

JEE Main Practice Test- 13 - Question 37

A pendulum bob is released from horizontal position shown. At an angular position θ, its total acceleration makes an angle ϕ with string, ϕ is -

Detailed Solution for JEE Main Practice Test- 13 - Question 37

mat = mg sin θ

JEE Main Practice Test- 13 - Question 38

A ball of mass m is released from A inside a smooth wedge of mass m as shown in the figure. What is the speed of the wedge when the ball reaches point B?

JEE Main Practice Test- 13 - Question 39

A light particle moving horizontally with a speed of 12 m/s strikes a very heavy block moving in the same direction at 10 m/s. The collision is one dimensional and elastic. After the collision, the particle will

Detailed Solution for JEE Main Practice Test- 13 - Question 39

JEE Main Practice Test- 13 - Question 40

A particle A suffers an oblique elastic collision with a particle B that is at rest initially. If their masses are the same, then, after the collision :

Detailed Solution for JEE Main Practice Test- 13 - Question 40

As masses are equal and collision elastic

∴ velocity along line of impact gets exchanged and velocity perpendicular to line of impact remains unchanged.

JEE Main Practice Test- 13 - Question 41

A space vehicle of mass 200 kg is observed at t = 0 to pass through the origin of reference frame oxyz with velocity  relative to the frame. Due to explosive charges, the vehicle separates into three parts A, B and C of mass 100 kg, 60 kg and 40 kg respectively. At t = 2s the positions of parts A and B are observed to be at A (500, – 200, 250) and B (250, 0, – 100), where the coordinates are expressed in metres. The position of part C at that time is

Detailed Solution for JEE Main Practice Test- 13 - Question 41

JEE Main Practice Test- 13 - Question 42

Figure shows three coplanar forces acting on an object which does not have any other forces acting on it. Marks the correct options.

JEE Main Practice Test- 13 - Question 43

Figure below shows the variation of the moment of inertia of a uniform rod about an axis normal to its length with the distance of the axis from the end of the rod. The moment of inertia of the rod about an axis passing through its centre and perpendicular to the its length is

Detailed Solution for JEE Main Practice Test- 13 - Question 43

JEE Main Practice Test- 13 - Question 44

A semi-circular disc of radius 1 m and mass = 4 kg is lying on the horizontal x-y plane. If XX' is the axis of rotation of the body and a  is applied at point P, the magnitude of angular acceleration is equal to (the region is gravity free)

Detailed Solution for JEE Main Practice Test- 13 - Question 44

JEE Main Practice Test- 13 - Question 45

A uniform disk, a thin hoop (ring), and a uniform sphere, all with the same mass and same outer radius, are each free to rotate about a fixed axis through its center. Assume the hoop is connected to the rotation axis by light spokes. With the objects starting from rest, identical forces are simultaneously applied to the rims, as shown. Rank the objects according to their angular momentum after a given time t, least to greatest.

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JEE Main Practice Test- 13 - Question 46

(Instruction to attempt numerical value (integer) type question: If your answer is 100 write 100 only. Do not write 100.0)

A person wants to see AB part of his image (see figure). His eye level is at 1.8 m above the ground. If he uses minimum size of mirror required for this, find the height of the lowest point of the mirror above the ground.

Detailed Solution for JEE Main Practice Test- 13 - Question 46

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JEE Main Practice Test- 13 - Question 47

A charged particle of mass m = 1 mg and charge q = 1 μC enters along AB at point A in a uniform magnetic field B = 1.2 T existing in the rectangular region of size a × b, where a = 4 m and b = 3m. The particle leaves the region exactly at corner point C. What is the speed v (in ms–1) of the particle?

Detailed Solution for JEE Main Practice Test- 13 - Question 47

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JEE Main Practice Test- 13 - Question 48

Three identical resistors are connected in series. When a certain potential difference is applied across the combination, the total power dissipated is 27 W. How many times the power would be dissipated if the three resistors were connected in parallel across the same potential difference?

Detailed Solution for JEE Main Practice Test- 13 - Question 48

For three identical resistors in series, Ps = V2/3R. If they are now in parallel over the same voltage,

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JEE Main Practice Test- 13 - Question 49

Pertaining to two planets, the ratio of escape velocities from respective surfaces is 1 : 2, the ratio of the time periods of the same simple pendulum at their respective surfaces is 2 : 1 (in same order). Then, the ratio of their average densities is 1 : n. Find value of n.

Detailed Solution for JEE Main Practice Test- 13 - Question 49

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JEE Main Practice Test- 13 - Question 50

Two particles P and Q have mass 4.0 kg and 1.0 kg respectively. They are projected along a vertical line with velocity  up = 20m/s and uQ =  5m/s when separation between them was 60 m. P was projected vertically up while Q was projected vertically down. Calculate the maximum height attained (in m) by the centre of mass of the system of two particles, measured from the initial position of P. Assume that the particles do not collide and that the ground is far below their point of projection [g = 10 m/s2].

Detailed Solution for JEE Main Practice Test- 13 - Question 50

JEE Main Practice Test- 13 - Question 51

Which of the following is incorrectly matched?

Detailed Solution for JEE Main Practice Test- 13 - Question 51

JEE Main Practice Test- 13 - Question 52

Arrange the given intermediates in decreasing order of their hydride donation tendency :

Detailed Solution for JEE Main Practice Test- 13 - Question 52

Hydride donation tendency α e donating group.

JEE Main Practice Test- 13 - Question 53

The following cell at 298K,two weak acids (HA) and(HB) with pka (HA) = 5 and pka (HB) = 7 of equal molarity have been used as shown.
Pt|H2(g, 1atm) | HA(1M) || HB(1M)|H2(g,1atm)|Pt
Thus, emf of the cell is -

Detailed Solution for JEE Main Practice Test- 13 - Question 53

JEE Main Practice Test- 13 - Question 54

Which of the following addition reaction will result into a complex salt?

Detailed Solution for JEE Main Practice Test- 13 - Question 54

JEE Main Practice Test- 13 - Question 55

Identify compounds which give precipitate with Tollen's reagent.

(c) Me – C ≡ C – H

Detailed Solution for JEE Main Practice Test- 13 - Question 55

(c) Me – C ≡ C – H → 1-Alkyne has acidic 'H' than give ppt.

JEE Main Practice Test- 13 - Question 56

The standard half-cell reduction potential of Fe3+ (aq) | Fe is – 0.036 V and that of OH | Fe(OH)3(s) | Fe is – 0.756 V. The value of log Ksp for Fe(OH)3 at 298 K is

Detailed Solution for JEE Main Practice Test- 13 - Question 56

ΔG° = - 3 FE°
– 3F (– 0.716) = – 3F(0.036) – RT ln Ksp + 3F (– 0.756) = + 3F(0.036) + RT ln Ksp On solving
log Ksp = – 36.52

JEE Main Practice Test- 13 - Question 57

Which of the following co-ordination entity is chiral?

Detailed Solution for JEE Main Practice Test- 13 - Question 57

JEE Main Practice Test- 13 - Question 58

In which compound the products obtained upon prolonged heating can not be separated by fractional distillation.

Detailed Solution for JEE Main Practice Test- 13 - Question 58

Enantiomer is not separated by fractional distillation.

(4) None

JEE Main Practice Test- 13 - Question 59

Which of the following is correct relation?

JEE Main Practice Test- 13 - Question 60

Two complexes [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl can't be distinguished by -

JEE Main Practice Test- 13 - Question 61

The product A is

Detailed Solution for JEE Main Practice Test- 13 - Question 61

→ More reactive Aldehyde oxidise and Less reactive reduced.

JEE Main Practice Test- 13 - Question 62

Select the incorrect statement based on the following half-reaction -

JEE Main Practice Test- 13 - Question 63

In which of the following complexes, change in colour is not observed on heating ?

Detailed Solution for JEE Main Practice Test- 13 - Question 63

Due to d10 configuration Zn2+ does not impart any colour on heating

JEE Main Practice Test- 13 - Question 64

Find the total number of Aldol products in given reaction.

Detailed Solution for JEE Main Practice Test- 13 - Question 64

Total = 6 product Ans.

JEE Main Practice Test- 13 - Question 65

The reaction : 2NO2(g) ⇌ N2O4(g), has ΔG0298K = -6kJ mol-1. If in the reaction mixture the partial pressure of NO2 is 0.4 atm and partial pressure of N2O4 is 0.2 atm than -

Detailed Solution for JEE Main Practice Test- 13 - Question 65

= – 6 kJmol–1 + 2.366 × 0.23 kJ mol–1
= – 6 + 0.549 = – 5.45 kJmol–1
So, reaction is spontaneous in forward direction.

JEE Main Practice Test- 13 - Question 66

Select a incorrect match :

Detailed Solution for JEE Main Practice Test- 13 - Question 66

Na+ + EDTA4– → Na4 EDTA

JEE Main Practice Test- 13 - Question 67

Which statement is not true :

Detailed Solution for JEE Main Practice Test- 13 - Question 67

(1) Protonation increases electrophilic of carbonyl group.

CF3SO3 is better leaving group than CH3SO3 because CH3SO3 is weak base in compare of CH3SO3

JEE Main Practice Test- 13 - Question 68

The standard heat of combustion of carbon(s), sulphur(s) and carbon disulphide(l) are – 390, – 290 and – 1100 kJ/mol respectively. The standard heat of formation of carbon disulphide (l) is -

Detailed Solution for JEE Main Practice Test- 13 - Question 68

C(s) + 2S(s) → CS2(l)
ΔfH° = -390 - (290) × 2 - (-1100)
= + 130 kJ mol-1

JEE Main Practice Test- 13 - Question 69

of Mn, Fe and Co is +1.57, + 0.77 and + 1.97 respectively then this irregularity is due to

Detailed Solution for JEE Main Practice Test- 13 - Question 69

Mn → [Ar] 3d5 4s2 ; Mn3+ → d4
Fe → [Ar] 3d6 4s2 ; Fe2+ → d6, Fe3+ → d5
Co → [Ar] 3d7 4s2 ; Co3+ → d6

JEE Main Practice Test- 13 - Question 70

Which of the following ketones has the largest equilibrium constant for addition of water?

Detailed Solution for JEE Main Practice Test- 13 - Question 70

Cyclopropone has largest equilibrium constant.

*Answer can only contain numeric values
JEE Main Practice Test- 13 - Question 71

(Instruction to attempt numerical value (integer) type question: If your answer is 100 write 100 only. Do not write 100.0)

In hydrogen atom an orbit has a diameter of about 16.92 Å. What is the maximum number of electrons that can be accommodated?

Detailed Solution for JEE Main Practice Test- 13 - Question 71

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JEE Main Practice Test- 13 - Question 72

The diagonal relationship is shown by the elements upto how many groups only?

Detailed Solution for JEE Main Practice Test- 13 - Question 72

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JEE Main Practice Test- 13 - Question 73

In an iodometric estimation, the following reactions occur
2Cu+2 + 4I → Cu2I2 + I2;
I2 + 2Na2S2O3 → 2Nal + Na2S4O6
0.12 mole of CuSO4, was added to excess of Kl solution and the liberated iodine required 120 ml of hypo.
The molarity of the hypo solution was

Detailed Solution for JEE Main Practice Test- 13 - Question 73

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JEE Main Practice Test- 13 - Question 74

Equivalent weight of potash alum is M1/x and equivalent weight of gypsum is M2/y. Then x – y will be

Detailed Solution for JEE Main Practice Test- 13 - Question 74

Eq. wt of Potash alum = M/8
Eq. wt of Gypsum = M/2

*Answer can only contain numeric values
JEE Main Practice Test- 13 - Question 75

How much amount of CaCO3 in gram having percentage purity 50 per cent produces 0.56 litre of CO2 at STP on heating?

Detailed Solution for JEE Main Practice Test- 13 - Question 75

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