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JEE Advanced

Explore popular questions from pBlock Elements for JEE Advanced. This collection covers pBlock Elements previous year JEE Advanced questions hand picked by experienced teachers.

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Q 1. {tex} \mathrm { HBr } {/tex} and {tex} \mathrm {HI } {/tex} reduce sulphuric acid, {tex} \mathrm {HCl } {/tex} can reduce {tex}\mathrm{ KMnO} _ { 4 } {/tex} and {tex} \mathrm {HF } {/tex} can reduce

A

{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

B

{tex} \mathrm { KMnO } _ { 4 } {/tex}

C

{tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

None of the above

Explanation

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Q 2. Bromine can be liberated from potassium bromide solution by the action of

A

Iodine solution

Chlorine water

C

Sodium chloride

D

Potassium iodide

Explanation

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Q 3. {tex} \ln \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } {/tex} each {tex} \mathrm { P } {/tex} atom is linked with....... {tex} \mathrm {O } {/tex} atoms

A

2

B

3

4

D

5

Explanation

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Q 4. Ammonia can be dried by

A

conc. {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

B

{tex} \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } {/tex}

{tex} \mathrm { CaO } {/tex}

D

anhydrous {tex} \mathrm { CaCl } _ { 2 } {/tex}

Explanation

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Q 5. The product formed in the reaction of {tex} \mathrm { SOCl } _ { 2 } {/tex} with white phosphorous is

{tex} \mathrm { PCl } _ { 3 } {/tex}

B

{tex} \mathrm { SO } _ { 2 } \mathrm { Cl } _ { 2 } {/tex}

C

{tex} \mathrm { SCl } _ { 2 } {/tex}

D

{tex} \mathrm { POCl } _ { 3 } {/tex}

Explanation

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Q 6.

Which of the following arrangements does not truly represent the property indicated against it?

A

: Oxidising power

B

: Electronegativity

C

: Electron affinity

: Bond energy

Explanation

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Q 7.

Consider the following reactions in which atoms have been labelled with isotopes (indicated by *)

(I)

(II)

In which case isotopes are equivalent in the products?

A

I

II

C

Both I and II

D

None of these

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Q 8.

What does Green Chemistry in terms of environment mean?

A

Green house effect

B

Reactions related to depletion of ozone layer

C

Photosynthetic reactions in plants

Reduction in the use and production of hazardous chemicals

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Q 9.

The number of bonds in sulphur trioxide trimer, is

A

Three

B

Two

C

One

Zero

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Q 10.

Extra pure N2 can be obtained by heating

A

NH3 with CuO

B

NH4 NO3

C

(NH4)2 Cr2O7

Explanation

Ba(s)+3N2(g)

Azide salt of barium can be obtained in purest form as well as the decomposition product contain solid Ba as by product alongwith gaseous nitrogen hence to additional step of separation is required.

Other reaction are

NH4 NO3 N2O+2H2O

2 NH3 + 3CuO 3Cu+3H2O+N2

(NH4)2Cr2O7 Cr2O3 +4H2O +N2

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Q 11.

Which of the following is not a chalcogen?

A

Se

B

O

C

S

Na

Explanation

Oxygen family elements (O, S, Se, Te, Po) are called chalcogen

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Q 12.

Select the correct statements

A

Helium has the lowest melting point and boiling point

B

Helium can diffuse through rubber, PVC and even glass

C

and form clathrate

All the above are correct statements

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Q 13.

Select the correct statement(s)

A

and are used as bleaching agents and as germicides

B

is used in the quantitative estimation of CO

C

Bond angle varies in the order

All of the above are correct statements

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Q 14.

Chlorine dioxide

A

Is paramagnetic in nature

B

Has odd-electron bond

C

Is stable

Has all the above properties true

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Q 15.

Of the following acids

I. Hypophosphorous acid

II. Oxalic acid

III. Glycine

A

I, II are monobasic, III dibasic and amphoteric

B

II monobasic, I dibasic acid, III amphoteric

I monobasic, II dibasic, III amphoteric

D

I, II dibasic, III amphoteric

Explanation

Monobasic, as only one attached to O-atom

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Q 16.

In case of oxygen family (Group 16)

A

The tendency for catenation decreases markedly as we go down the group

B

Maximum coordination of oxygen is four due to lack of -orbital but that of other elements is six due to presence of -orbital

C

The tendency to form multiple bonds with C, N and O decreases as going down the group from S to Te

All of the above are correct statements

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Q 17.

Dissociation of into and is

Kinetically controlled

B

Thermodynamically controlled

C

Kinetically as well as thermodynamically controlled

D

Neither kinetically nor thermodynamically controlled

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Q 18.

Which is most basic fluoride?

A

C

D

None is basic, all are acids

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Q 19.

Which one of the following is not a true “per acid”?

B

C

D

Explanation

have peroxy linkage

perchloric acid] no peroxy linkage

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Q 20.

Maximum coordination number of oxygen in liquid water is

A

Two

B

Three

Four

D

Five

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Q 21.

is the anhydride of

A

B

C

and

Explanation

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Q 22.

Which of the following atoms has the highest ionization energy?

B

C

D

Explanation

Being smallest in size

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Q 23.

reacts with in alkaline medium to produce

A

C

D

Explanation

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Q 24.

and are all very strong acids in aqueous solution. In glacial acetic acid medium, their acid strength is such that

B

C

D

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Q 25.

Thermal stability of hydrates of group 18 elements

Increases down the group

B

Decreases down the group

C

Remains unchanged

D

First increases up to and then decreases