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CHXI10:THE S-BLOCK ELEMENTS

315959 Consider the following statements regarding calcium carbonate.
I. It is a white fluffy powder and almost soluble in water.
II. It decomposed to evolve carbon dioxide when heated to $1200 K$ .
III. It reacts with conc. acid to liberate carbon monoxide.
IV. It is used in the manufacture of high quality paper, as an antacid, filler in cosmetics.
Choose the correct statements and select the correct option.

1 I, II

2 III and IV

3 I, II and IV

4 II, III and IV

Explanation:

Statements II, III and IV are correct, while the statement $I$ is incorrect. Its correct form is as follows: Calcium carbonate is a white fluffu powder and is almost insoluble in water. So, the option (4) is correct.

CHXI10:THE S-BLOCK ELEMENTS

315960 Which of the following statements is true about $Ca (OH)_{2}$ ?

1 It is used in the preparation of bleaching powder

2 It is a light blue solid

3 It does not possess disinfectant property

4 It is used in the manufacture of cement

CHXI10:THE S-BLOCK ELEMENTS

315970 Calcium is obtained by

1 electrolysis of molten

{CaCl}_{2}

2 electrolysis of solution of

{CaCl}_{2}

in water

3 reduction of

{CaCl}_{2}

with carbon

4 roasting of limestone

Explanation:

Electrolysis of molten ${CaCl}_{2}$ gives calcium at cathode
${Ca}^{2 +} + 2 e^{-} \to Ca$ at cathode
In case of electrolysis in aqueous medium, less electropositive $H^{+}$ is reduced at cathode rather than ${Ca}^{2 +}$ .

CHXI10:THE S-BLOCK ELEMENTS

315971 A and $B$ are two salts. A with dil. $HCl$ and $A$ & $B$ with conc. $H_{2} {SO}_{4}$ react to give reddish brown vapours, hence $A & B$ respectively are :

1

{NaNO}_{3}, NaBr

2

NaBr, {NaNO}_{3}

3

NaBr, {NaNO}_{2}

4

{NaNO}_{2}, NaBr

Explanation:

Nitrites give ${NO}_{2}$ (brown) with dil. acids. The nitrites and bromides give brown vapours of ${NO}_{2}$ and ${Br}_{2}$ with conc. acids.

CHXI10:THE S-BLOCK ELEMENTS

315959 Consider the following statements regarding calcium carbonate.
I. It is a white fluffy powder and almost soluble in water.
II. It decomposed to evolve carbon dioxide when heated to $1200 K$ .
III. It reacts with conc. acid to liberate carbon monoxide.
IV. It is used in the manufacture of high quality paper, as an antacid, filler in cosmetics.
Choose the correct statements and select the correct option.

1 I, II

2 III and IV

3 I, II and IV

4 II, III and IV

Explanation:

Statements II, III and IV are correct, while the statement $I$ is incorrect. Its correct form is as follows: Calcium carbonate is a white fluffu powder and is almost insoluble in water. So, the option (4) is correct.

CHXI10:THE S-BLOCK ELEMENTS

315960 Which of the following statements is true about $Ca (OH)_{2}$ ?

1 It is used in the preparation of bleaching powder

2 It is a light blue solid

3 It does not possess disinfectant property

4 It is used in the manufacture of cement

CHXI10:THE S-BLOCK ELEMENTS

315970 Calcium is obtained by

1 electrolysis of molten

{CaCl}_{2}

2 electrolysis of solution of

{CaCl}_{2}

in water

3 reduction of

{CaCl}_{2}

with carbon

4 roasting of limestone

Explanation:

Electrolysis of molten ${CaCl}_{2}$ gives calcium at cathode
${Ca}^{2 +} + 2 e^{-} \to Ca$ at cathode
In case of electrolysis in aqueous medium, less electropositive $H^{+}$ is reduced at cathode rather than ${Ca}^{2 +}$ .

CHXI10:THE S-BLOCK ELEMENTS

315971 A and $B$ are two salts. A with dil. $HCl$ and $A$ & $B$ with conc. $H_{2} {SO}_{4}$ react to give reddish brown vapours, hence $A & B$ respectively are :

1

{NaNO}_{3}, NaBr

2

NaBr, {NaNO}_{3}

3

NaBr, {NaNO}_{2}

4

{NaNO}_{2}, NaBr

Explanation:

Nitrites give ${NO}_{2}$ (brown) with dil. acids. The nitrites and bromides give brown vapours of ${NO}_{2}$ and ${Br}_{2}$ with conc. acids.

CHXI10:THE S-BLOCK ELEMENTS

315959 Consider the following statements regarding calcium carbonate.
I. It is a white fluffy powder and almost soluble in water.
II. It decomposed to evolve carbon dioxide when heated to $1200 K$ .
III. It reacts with conc. acid to liberate carbon monoxide.
IV. It is used in the manufacture of high quality paper, as an antacid, filler in cosmetics.
Choose the correct statements and select the correct option.

1 I, II

2 III and IV

3 I, II and IV

4 II, III and IV

Explanation:

Statements II, III and IV are correct, while the statement $I$ is incorrect. Its correct form is as follows: Calcium carbonate is a white fluffu powder and is almost insoluble in water. So, the option (4) is correct.

CHXI10:THE S-BLOCK ELEMENTS

315960 Which of the following statements is true about $Ca (OH)_{2}$ ?

1 It is used in the preparation of bleaching powder

2 It is a light blue solid

3 It does not possess disinfectant property

4 It is used in the manufacture of cement

CHXI10:THE S-BLOCK ELEMENTS

315970 Calcium is obtained by

1 electrolysis of molten

{CaCl}_{2}

2 electrolysis of solution of

{CaCl}_{2}

in water

3 reduction of

{CaCl}_{2}

with carbon

4 roasting of limestone

Explanation:

Electrolysis of molten ${CaCl}_{2}$ gives calcium at cathode
${Ca}^{2 +} + 2 e^{-} \to Ca$ at cathode
In case of electrolysis in aqueous medium, less electropositive $H^{+}$ is reduced at cathode rather than ${Ca}^{2 +}$ .

CHXI10:THE S-BLOCK ELEMENTS

315971 A and $B$ are two salts. A with dil. $HCl$ and $A$ & $B$ with conc. $H_{2} {SO}_{4}$ react to give reddish brown vapours, hence $A & B$ respectively are :

1

{NaNO}_{3}, NaBr

2

NaBr, {NaNO}_{3}

3

NaBr, {NaNO}_{2}

4

{NaNO}_{2}, NaBr

Explanation:

Nitrites give ${NO}_{2}$ (brown) with dil. acids. The nitrites and bromides give brown vapours of ${NO}_{2}$ and ${Br}_{2}$ with conc. acids.

CHXI10:THE S-BLOCK ELEMENTS

315959 Consider the following statements regarding calcium carbonate.
I. It is a white fluffy powder and almost soluble in water.
II. It decomposed to evolve carbon dioxide when heated to $1200 K$ .
III. It reacts with conc. acid to liberate carbon monoxide.
IV. It is used in the manufacture of high quality paper, as an antacid, filler in cosmetics.
Choose the correct statements and select the correct option.

1 I, II

2 III and IV

3 I, II and IV

4 II, III and IV

Explanation:

Statements II, III and IV are correct, while the statement $I$ is incorrect. Its correct form is as follows: Calcium carbonate is a white fluffu powder and is almost insoluble in water. So, the option (4) is correct.

CHXI10:THE S-BLOCK ELEMENTS

315960 Which of the following statements is true about $Ca (OH)_{2}$ ?

1 It is used in the preparation of bleaching powder

2 It is a light blue solid

3 It does not possess disinfectant property

4 It is used in the manufacture of cement

CHXI10:THE S-BLOCK ELEMENTS

315970 Calcium is obtained by

1 electrolysis of molten

{CaCl}_{2}

2 electrolysis of solution of

{CaCl}_{2}

in water

3 reduction of

{CaCl}_{2}

with carbon

4 roasting of limestone

Explanation:

Electrolysis of molten ${CaCl}_{2}$ gives calcium at cathode
${Ca}^{2 +} + 2 e^{-} \to Ca$ at cathode
In case of electrolysis in aqueous medium, less electropositive $H^{+}$ is reduced at cathode rather than ${Ca}^{2 +}$ .

CHXI10:THE S-BLOCK ELEMENTS

315971 A and $B$ are two salts. A with dil. $HCl$ and $A$ & $B$ with conc. $H_{2} {SO}_{4}$ react to give reddish brown vapours, hence $A & B$ respectively are :

1

{NaNO}_{3}, NaBr

2

NaBr, {NaNO}_{3}

3

NaBr, {NaNO}_{2}

4

{NaNO}_{2}, NaBr

Explanation:

Nitrites give ${NO}_{2}$ (brown) with dil. acids. The nitrites and bromides give brown vapours of ${NO}_{2}$ and ${Br}_{2}$ with conc. acids.

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