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Test: JEE Main 35 Year PYQs- The p-Block Elements - JEE MCQ


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30 Questions MCQ Test Chapter-wise Tests for JEE Main & Advanced - Test: JEE Main 35 Year PYQs- The p-Block Elements

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Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 1

Alum helps in purifying water by

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 1

Alum furnishes Al3+ ions which bring about coagulation of negatively charged clay particles, bacteria etc.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 2

In XeF2, XeF4, XeF6 the number of lone pairs on Xe are respectively

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 2

In the formation of  XeF2, sp3d hybridisation occurs which gives the molecule a trigonal bipyramidal structure.


In the formation of XeF4, sp3d2 hybridization occurs which gives the molecule an octahedral structure.

In the formation of XeF6, sp3d3 hybridization occurs which gives the molecule a pentagonal bipyramidal structure.

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Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 3

In case of nitrogen, NCl3 is possible but not NCl5 while in case of phosphorous, PCl3 as well as PCl5 are possible. It is due to

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 3

NOTE :  In phosphorous the 3d- orbitals are available.
Hence phosphorous can from pentahalides also but nitrogen can not form pentahalide due to absence of dorbitals

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 4

Which of the following statements is true?

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 5

Number of sigma bonds in P4O10 is

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 5

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 6

Oxidation number of Cl in CaOCl2 (bleaching power) is:

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 6


hence oxidation no of Cl in OCl– is
–2 + x2 = –1
x2 = 2–1 = +1
now oxidation no. of another Cl is –1 as it is present as Cl.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 7

What may be expected to happen when phosphine gas is mixed with chlorine gas ?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 7

On mixing phosphine with chlorine gas PCl5 and HCl forms. The mixture cools down.
PH3 + 4Cl2 –––––→  PCl5 + 3HCl

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 8

Concentrated hydrochlor ic acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 8

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 9

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 9

In graphite, carbon is sp2 hybridized. Each carbon is thus linked to three other carbon atoms forming hexagonal rings. Since only three electrons of each carbon are used in making hexagonal ring, fourth electron of each carbon is free to move. This makes graphite a good conductors of heat and electricity.
Further graphite has a two dimensional sheet like structure. These various sheets are held together by weak van der Waal’s force of attraction. due to these weak forces of attraction, one layer can slip over the other. This makes graphite soft and a good lubricating agent.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 10

Glass is a

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 10

Glass is a translucent or transparent amorphous supercooled solid solution or we can say super cooled liquid of silicates and borats having a general formula R2O. MO. 6 SiO2. where R = Na or K and M = Ca, Ba, Zn or Pb.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 11

Which one of the following substan ces has the highest proton affinity ?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 11

Among  the given compounds, the  is most basic. Hence has highest proton affinity

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 12

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 12

It is mer cury because it exists as liquid at room temperature.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 13

Which among the following factors is the most important in making fluorine the strongest oxidizing halogen ?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 13

Fluorine is the strongest oxidizing agent due to low heat of dissociation and high heat of hydration which compensate the lower value of electron affinity.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 14

Which one of the following statement regarding helium is incorrect ?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 14

Property of He -It is used in weather balloons and tires of airplanes as He is non inflammable. He is heavier than H. So the correct option is c.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 15

Beyllium and aluminium exhibit many properties which are similar. But, the two elements differ in

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 15

The maximum valency of beryllium is +2 while that of aluminium is +3.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 16

Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene.
When dissolved in water, it gives

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 16

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 17

Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction ?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 17

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 18

The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 18

Hypophosphorous acid 

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 19

The correct order of the thermal stability of hydrogen halides (H – X) is

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 19

The H–X bond strength decreases from HF to HI. i.e.
HF > HCl > HBr > HI. Thus HF is most stable while HI is least stable. This is evident from their decomposition reaction: HF and HCl are stable upto 1473K, HBr decreases slightly and HI dissociates considerably at 713K. The decreasing stability of the hydrogen halide is also reflected in the values of dissociation energy of the H–X bond

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 20

Heating an aqueous solution of alumin ium chloride to dryness will give

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 20

The solution of aluminium chloride in water is acidic due to hydrolysis.        

AlCl3 + 3H2O –––––→ Al(OH)3 +  3HCl.
On heating  it till dryness Al(OH)3 is converted into Al2O3

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 21

In silicon dioxide

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 21

In SiO2 (quartz), each of O-atom is shared between two SiO44– tetrahedra

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 22

The structure of diborane (B2H6) contains

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 22

In diborane structure B2H6 there are two 2c-2e bonds and two 3c–2e bonds (see structure of diborane).
Structure of B2H6 :

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 23

Which of the following statements is true?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 23

The   is stronger than  The more the oxidation state of N, the more is the acid character.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 24

The increasing order of the first ionization enthalpies of the elements B, P, S and F (Lowest first) is

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 24

The correct order of ionisation enthalpies is

F > P > S > B

NOTE : On moving along a period ionization enthalapy increases from left to right and decreases from top to bottom in a group. But this trend breaks up in case of atom having  fully or half filled stable orbitals.
In this case P has a stable half filled electronic configuration hence its ionisation enthalapy is greater in comparision to S. Hence the correct order is

B <  S < P < F.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 25

What products are expected from the disproportionation reaction of hypochlorous acid?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 25

During disproportionation same compound undergo simultaneous oxidation and reduction.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 26

Identify the incorrect statement among the following.

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 26

Chlorine reacts with excess of ammonia to produce ammonium chloride and nitrogen.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 27

Regular use of the following fertilizers increases the acidity of soil?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 27

(NH4)2SO4 + 2H2O → 2H2SO4 + NH4OH H2SO4 is strong acid and increases the acidity of soil.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 28

Which one of the following is the correct statement?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 28

The correct formula of inorganic benzene is B3N3H6 so (d) is incorrect statement

Boric acid  is a lewis acid so (a) is
incorrect statement.
The coordination number exhibited by beryllium is 4 and not 6 so statement (b) is incorrect.
Both BeCl2 and AlCl3 exhibit bridged structures in solid state so (c) is correct statement.

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 29

Which one of the following reactions of xenon compounds is not feasible?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 29

The products of the concerned reaction react each other forming back the reactants.

XeF6 + 3H2O → XeO3+ 6HF .

Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 30

Which of the following statement is wrong?

Detailed Solution for Test: JEE Main 35 Year PYQs- The p-Block Elements - Question 30

The ease of for mation an d stability  of hydrides decreases rapidly from NH3 to BiH3. This is evident from their dissociation temperature which decreases from NH3 to BiH3. As we go down the group the size of central atom increases and thus metal-hydrogen bond becomes weaker due to decreased overlap between the large central atom and small hydrogen atom.

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