The correct order of boiling points for group 16 hydrides is:

1. H₂O < H₂S < H₂Se < H₂Te

2. H₂Te < H₂Se < H₂S < H₂O

3. H₂S < H₂Se < H₂Te < H₂O

4. H₂O < H₂Te < H₂Se < H₂S

Ammonia on reaction with excess of chlorine gives

1. NCl₃ and HCl

2. N₂ and NH₄Cl

3. NCl₃ and NH₄Cl

4. N₂ and HCl

White phosphorous reacts with calcium to form a certain compound which on hydrolysis produces

1. PH₃

2. H₃PO₄

3. P₄O₆

4. P₄O₁₀

Which of the following pairs of molecules have the almost identical bond dissociation energy?

1. F₂ and H₂

2. N₂ and CO

3. F₂ and I₂

4. HF and O₂

Match the interhalogen compounds of Column I with the geometry in Column II and assign the correct code.

Column I             Column II
A. XX'                 (i) T-shape
B. XX'₃               (ii) Pentagonal bipyramidal
C. XX'₅               (iii) Linear
D. XX'₇                (iv) Square-pyramidal
                           (v) Tetrahedral

The correct match among the following is -
       A   B    C    D
1.   (iii) (iv) (i) (ii)

2.   (iii) (i) (iv) (ii)

3.   (v) (iv) (iii) (ii)

4.   (iv) (iii) (ii) (i)

In which pair of ions both the species contain S-S bond?

$\left(\mathrm{a}\right) {\mathrm{S}}_2{\mathrm{O}}_7^{2-}, {\mathrm{S}}_2{\mathrm{O}}_3^{2-}$
$\left(\mathrm{b}\right) {\mathrm{S}}_4{\mathrm{O}}_6^{2-}, {\mathrm{S}}_2{\mathrm{O}}_3^{2-}$
$\left(\mathrm{c}\right) {\mathrm{S}}_2{\mathrm{O}}_7^{2-}, {\mathrm{S}}_2{\mathrm{O}}_8^{2-}$
$\left(\mathrm{d}\right) {\mathrm{S}}_4{\mathrm{O}}_6^{2-}, {\mathrm{S}}_2{\mathrm{O}}_7^{2-}$

AlF₃ is soluble in HF only in presence of KF. It is due to the formation of
(1) K₃[AIF₃H₃]

(2) K₃[AIF₆]

(3) AlH₃

(4) K[AIF₃H]

Hot concentrated sulphuric acid is a moderately strong oxidising agent. Which of the following reaction doe not show oxidising behaviour?

(a) Cu + 2H₂SO₄ $\to$CuSO₄ + SO₂ + 2H₂O

(b) 3S + 2H₂SO₄ $\to$3SO₂ + 2H₂O

(c) C + 2H₂SO₄ $\to$CO₂ + 2SO₂ + 2H₂O

(d) CaF₂ + H₂SO₄ $\to$CaSO₄ + 2HF

Among the following, which one is a wrong statement?

(1) PH₅ and BiCl₅ do not exist

(2) ρp-dp bonds are present in SO₂

(3) SeF₄ and CH₄ have same shape

(4) ${\mathrm{I}}_3^{+}$ has bent geometry

Copper on heating with concentrated HNO₃ produces:

1. Cu(NO₃)₂ and NO       

2. Cu(NO₃)₂, NO and NO₂

3. Cu(NO₃)₂ and N₂O       

4. Cu(NO₃)₂ and NO₂