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CBSE 12th Standard Chemistry Subject The p-Block Elements Ncert Exemplar MCQ Questions 2021

Published on: 24/05/2021

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Multiple Choice Question

5 x 1 = 5

Which o the following pairs of ions are isoelectronic and isostructural?

(a)

CO₃^2-, NO₃^-

(b)

CIO₃^-, CO₃^2-

(c)

SO₃^2-, NO₃^-

(d)

CIO₃^-, SO₃^2-

Which of the following elements can be involved in p\(\pi\)-d\(\pi\) bonding?

(a)

Carbon

(b)

Nitrogen

(c)

Phosphorus

(d)

Boron

In a cyclo tri metaphosphoric acid molecule, how many single and double bonds are present?

(a)

3 double bonds ; 9 single bonds

(b)

6 double bonds ; 6 single bonds

(c)

3 double bonds ; 12 single bonds

(d)

zero double bonds ; 12 single bonds

In quantitative analysis when H₂S is passed through an aqueous solution of salt acidified with dil . HCl, a black precipitate is obtained. On boiling the precipitate with dil . HNO₃it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives.......

(a)

deep blue precipitate of Cu(OH)₂

(b)

deep blue solution of [Cu(NH₃)₄]²⁺

(c)

deep blue solution of Cu(NO₃)₂

(d)

deep blue solution of Cu(OH)₂.Cu(NO₃)₂

On addition of conc.H₂SO₄ to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes comes out. This is because

(a)

H₂SO₄reduces HI to I₂

(b)