JEE Main Chemistry Mock

QUESTION: 1

Proof spirit contains about

A.
40% alcohol by weight
B.
50% alcohol by weight
C.
25% alcohol by weight
D.
10% alcohol by weight

Solution:

QUESTION: 2

The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits

A.
Metamerism
B.
Tautomerism
C.
Enantiomerism
D.
Geometrical isomerism

Solution:

QUESTION: 3

Identify the correct statement regarding enzymes.

A.
they cannot be poisoned
B.
they are very specific in their action
C.
they possess well-defined active sites
D.
they function at very high temperatures

Solution:

QUESTION: 4

The facor which changes equilibrium constant of the reaction A₂(g) + B₂(g) → 2AB(g) is

A.
Total pressure
B.
Amounts of A₂ and B₂
C.
Temperature
D.
Catalyst

Solution:

QUESTION: 5

The ligand : NO is named as

A.
Nitrosonium
B.
Nitronium
C.
Nitrosyl
D.
Nitro

Solution:

QUESTION: 6

Which one of the following reactions occur at the cathode?

A.
2 OH^- → H₂O + 1/2 O₂ + 2 e^-
B.
Ag → Ag + e −
C.
Fe⁺² → Fe³⁺ + e^-
D.
Cu⁺² + 2 e^- → C u

Solution:

QUESTION: 7

The order of a reaction depends upon

A.
pressure
B.
temperature
C.
molecularity
D.
concentration of reactants

Solution:

QUESTION: 8

Which of the following reactions actually take place?

A.
Zn(s) + 2Ag⁺(aq) → Zn⁺⁺ + 2Ag(s)
B.
Zn⁺⁺+ 2Ag(s) → 2Ag⁺(s) + Zn(s)
C.
Zn(s)+ Ag(s) → Zn⁺⁺(aq) + Ag⁺(aq)
D.
Zn⁺⁺(aq) + Ag⁺(aq) → Zn(s) + Ag(s)

Solution:

QUESTION: 9

The first ionisation potential of Li will be

A.
Greater than Be
B.
Less than Be
C.
Equal to Na
D.
Equal to F

Solution: As we move from left to right in a period, the ionisation potential increases with increasing atomic number and the ionisation potential keeps on decreasing regularly as we move down a group. Thus the first ionisation potential of Li is less than Be and higher than Na.

QUESTION: 10

When benzenediazonium chloride in hydrochloric acid reacts with cuprous chloride, then chlorobenzene is formed. The reaction is called

A.
Gattermann reaction
B.
Perkin reaction
C.
Etard reaction
D.
Sandmeyer reaction

Solution:

QUESTION: 11

Which of the following is a non-electrolyte?

A.
NaCl
B.
CaCl₂
C.
C₆H₁₂O₆
D.
CH₃COOH

Solution:

QUESTION: 12

In decinormal solution, CH₃COOH acid is ionised to the extent of 1.3%. If log 1.3=0.11. What is the pH of the solution?

A.
3.89
B.
2.89
C.
4.89
D.
unpredictable

Solution:

QUESTION: 13

The Δ H value for the reaction H₂ + Cl₂ → 2 HCl is − 44.12 K.cal. If E₁ is the activation energy of the reactants and E₂ is the activation energy of the products, then for the above reaction

A.
E₁ > E₂
B.
E₁ < E₂
C.
E₁ = E₂
D.
Δ H is not related to E₁ to E₂

Solution:

QUESTION: 14

Phenolphthalein does not act as an indicator for the titration between

A.
NaOH and CH₃COOH
B.
H₂C₂O₄ and KMnO₄ sol
C.
Ba(OH)₂ and HCl
D.
KOH and H₂SO₄

Solution:

QUESTION: 15

If H₂S is passed in ZnSO₄ containing HCl,Zinc sulphide is not precipitated because K_sp of

A.
Zinc sulphide is not exceeded
B.
hydrogen sulphide is not exceeded
C.
both the sulphides is decreased
D.
both zinc sulphide and H₂S are decreased

Solution:

QUESTION: 16

The reagent used to convert Ethanoic acid to Ethanol is

A.
LiAlH₄
B.
BH₃
C.
PCl₃
D.
K₂Cr₂O₇/H⁺

Solution:

QUESTION: 17

Conc. HNO₃ forms NO₂⁺ in presence of :

A.
conc. H₂SO₄
B.
Fe
C.
FeBr₃
D.
AlCl₃

Solution:

QUESTION: 18

On mixing a certain alkane with chlorine and irradiating it with ultraviolet light,it forms only one monochloroalkane .This alkane could be

A.
neopentane
B.
propane
C.
pentane
D.
isopentane

Solution:

QUESTION: 19

The solid NaCl is a bad conductor of electricity since

A.
In solid NaCl there are no ions
B.
Solid NaCl is covalent
C.
In Solid NaCl there is no velocity of ions
D.
In solid NaCl there are no electrons

Solution:

QUESTION: 20

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.0 g?(Atomic weights of Na = 23 and Cl = 35.5)

A.
2.57 x 10²¹
B.
5.14 x 10²¹
C.
1.28 x 10²¹
D.
1.71 x 10²¹

Solution:

Gram formula mass of NaCl = (23 + 35.5)g = 58.5g
Number of formula units of NaCl in 1.0g of NaCl = 6.02 x 10²³/58.5 x1.0
There are four formula units per unit cell in NaCl
∴ Number of unit cells = 6.02 x 10²³ x1.0/58.5 x4 = 2.57 x 10²¹