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Explore popular questions from sBlock Element (Alkali and Alkaline earth metals) for JEE Advanced. This collection covers sBlock Element (Alkali and Alkaline earth metals) previous year JEE Advanced questions hand picked by experienced teachers.

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sBlock Element (Alkali and Alkaline earth metals)

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Q 1. A substance absorbs {tex} \mathrm { CO } _ { 2 } {/tex} and voilently reacts with water. The substance is

A

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

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

C

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

D

{tex} \mathrm { ZnO } {/tex}

Explanation

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Q 2. The metallic lustre exhibited by sodium is explained by

A

diffusion of sodium ions

oscillation of loose electrons

C

excitation of free protons

D

existence of body centered cubic lattice

Explanation

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Q 3. The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order.
{tex} \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 } ( \mathrm { I } )\ \mathrm { MgCO } _ { 3 } ( \mathrm { II } )\ \mathrm { CaCO } _ { 3 } ( \mathrm { III } ) \ \mathrm { BeCO } _ { 3 } ( \mathrm { IV } ) {/tex}

A

{tex} \mathrm { I } < \mathrm { II } < \mathrm { III } < \mathrm { IV } {/tex}

{tex} \mathrm { IV } < \mathrm { II } < \mathrm { III } < \mathrm { I } {/tex}

C

{tex} \mathrm { IV } < \mathrm { II } < \mathrm { I } < \mathrm { III } {/tex}

D

{tex} \mathrm { II } < \mathrm { IV } < \mathrm { III } < \mathrm { I } {/tex}

Explanation

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Q 4. The set representing the correct order of first ionization potential is

A

{tex} \mathrm { K } > \mathrm { Na } > \mathrm { Li } {/tex}

{tex} \mathrm { Be } > \mathrm { Mg } > \mathrm { Ca } {/tex}

C

{tex} \mathrm { B } > \mathrm { C } > \mathrm { N } {/tex}

D

{tex} \mathrm { Ge } > \mathrm { Si } > \mathrm { C } {/tex}

Explanation

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Q 5. Hydrogen peroxide in its reaction with {tex} \mathrm { KIO } _ { 4 } {/tex} and {tex} \mathrm { NH } _ { 2 } \mathrm { OH } {/tex} respectively, is acting as a

Reducing agent, oxidising agent

B

Reducing agent, reducing agent

C

Oxidising agent, oxidising agent

D

Oxidising agent, reducing agent

Explanation

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Q 6. {tex} \mathrm {HCl}{/tex} is added to following oxides. Which one would give {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } ? {/tex}

A

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

B

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

{tex} \mathrm { BaO } _ { 2 } . 8 \mathrm { H } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { NO } _ { 2 } {/tex}

Explanation

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Q 7. A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

A

sodium atoms

B

sodium hydride

C

sodium amide

solvated electrons

Explanation

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Q 8. Hydrogen gas will not reduce:

A

heated cupric oxide

B

heated ferric oxide

C

heated stannic oxide

heated aluminium oxide

Explanation

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Q 9. The pair of compounds which cannot exist together in solution is :

{tex} \mathrm { NaHCO } _ { 3 } {/tex} and {tex} \mathrm { NaOH } {/tex}

B

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex} and {tex} \mathrm { NaHCO } _ { 3 } {/tex}

C

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex} and {tex} \mathrm { NaOH } {/tex}

D

{tex} \mathrm { NaHCO } _ { 3 } {/tex} and {tex} \mathrm { NaCl } {/tex}

Explanation

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Q 10. The volume strength of {tex} 1.5 \mathrm { N }\ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution is

A

4.8

8.4

C

3.0

D

8.0

Explanation

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Q 11. A sodium salt on treatment with {tex} \mathrm { MgCl } _ { 2 } {/tex} gives white precipitate only on heating. The anion of the sodium salt is

{tex} \mathrm { HCO } _ { 3 } ^ { - } {/tex}

B

{tex} \mathrm { CO } _ { 3 } ^ { 2 - } {/tex}

C

{tex} \mathrm { NO } _ { 3 } ^ { - } {/tex}

D

{tex} \mathrm { SO } _ { 4 } ^ { 2 - } {/tex}

Explanation

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Q 12.

Select the correct statement(s)

A

Presence of in table salt causes it to clump

B

Addition of to table salt converts to non-hygroscopic salt

Both (a) and (b)

D

None of the above

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Q 13.

In which of the following the hydration energy is higher than the lattice energy?

A

C

D

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Q 14.

Select the correct statement(s)

A

Beryllium and magnesium hydride are covalent and polymeric

B

and are ionic

C

contains three-centre two-electron bond

All of the above are correct statements

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Q 15.

A metal readily forms water soluble . It also forms oxide which becomes inert on heating. Hydroxide is insoluble in water but soluble in solution. What is ?

A

Mg

B

C

Ca

Be

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Q 16.

Slaked lime and chlorine reacts to produce

A

Quicklime

B

C

Mixture of and

Explanation

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Q 17.

Identify the correct statement

A

Gypsum is obtained by heating plaster of Paris

B

Plaster of Paris can be obtained by hydration of gypsum

Plaster of Paris contains higher percentage of calcium than does gypsum

D

Plaster of Paris obtained from gypsum by oxidation

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Q 18.

Alkaline earth metals are

Reducing agent

B

Dehydrating agent

C

Amphoteric

D

Oxidizing agent

Explanation

Due to low (IE) and most negative values

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Q 19.

A compound which can be used in space vehicles both to absorb and liberate is

A

B

D

Explanation

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Q 20.

Which of the following is not used as food preservatives?

A

B

C

Explanation

is used as preservatives of dead biological specimen

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Q 21.

Which is used in the treatment of manic-depressive disorders?

A

C

D

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Q 22.

is formed when

A

reacts with solution

B

reacts with solution

Both (a) and (b) correct

D

None of the above is correct

Explanation

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Q 23.

Be and do not resemble in

A

Both become passive on reaction with due to formation of oxide layer

Their chlorides are Lewis bases

C

Chlorides exist in polymeric form

D

Hydroxides are soluble in alkali as well as in acid

Explanation

Chlorides are Lewis acids

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Q 24.

Which of the following statements are true about II A group elements?

A

All form nitrides in air

B

Be is amphoteric

C

is ionic ‘salt-like’ hydride

All of the above are correct statements

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Q 25.

Select the incorrect statement

can be stored in a vessel made of

B

can be stored in a vessel made of alloy

C

HF can be stored in a vessel made of wax

D

HF attacks glass

Explanation