P-Block - Super Live Session

1. Which is the correct statement for the given acids?

1.	Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
2.	Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
3.	Both are triprotic acids
4.	Both are diprotic acids

The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in the sequence:
1. $B C l_{3} > B F_{3} > B B r_{3}$
2. $B B r_{3} > B C l_{3} > B F_{3}$
3. $B B r_{3} > B F_{3} > B C l_{3}$
4. $B F_{3} > B C l_{3} > B B r_{3}$

The reaction that does not produce nitrogen is-
1. Heating ${({NH}_{4})}_{2} {Cr}_{2} O_{7}$
2. Excess of ${NH}_{3} + {Cl}_{2}$
3. Heating of ${NaN}_{3}$
4. Heating of ${NH}_{4} {NO}_{3}$

Which of the following contains salts of H₃PO₃?
I. NaH₂PO₃ II. Na₂HPO₃ III. Na₃PO₃
1. I, and II only
2. I, II, and III
3. II and III only
4. III only

In the structure of borax, the numbers of boron atoms and B-O-B units, respectively, are
1. 4 and 5
2. 4 and 3
3. 5 and 4
4. 5 and 3

The complete hydrolysis of ${XeF}_{6}$ results in the formation of
1. ${XeO}_{2} F_{2}$
2. ${XeOF}_{4}$
3. ${XeO}_{3}$
4. ${XeO}_{2}$

Ionization enthalpy ( $∆_{i} H_{1} kJ {mol}^{- 1}$ ) for the elements of Group 13 follows the order.

1.	B > Al > Ga > In > Tl	2.	B < Al < Ga < In < Tl
3.	B < Al > Ga < In > Tl	4.	B > Al < Ga > In < Tl

A compound X, of boron, reacts with ${NH}_{3}$ on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating ${BF}_{3}$ with Lithium aluminium hydride. The compounds X and Y are represented by the formulas -

1.	$\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 $	2.	$\mathrm{B}_2 \mathrm{O}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 $
3.	$\mathrm{BF}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 $	4.	$\mathrm{B}_3 \mathrm{~N}_3 \mathrm{H}_6, \mathrm{~B}_2 \mathrm{H}_6$

NO₂ is the anhydride of
1. HNO₃
2. HNO₂
3. HNO₃ + HNO₂
4. None of these

10.

A compound that cannot hydrolysed with water is -
1. ${PCl}_{3}$
2. ${NF}_{3}$
3. ${NCl}_{3}$
4. ${BCl}_{3}$

11.

The incorrect statement among the following is -

(1) F₂ > Cl₂ > Br₂ > I (Oxidising Power)
(2) HI >HBr > HCl > HF (Acidic Strength)
(3) F₂ > Cl₂ > Br₂ > I₂ (Bond Energy)
(4) HF > HI > HBr > HCl (Boiling Point)

12.

The correct order of acidic strength of oxyacid of phosphorous is

(1) H₃PO₂ > H₃PO₃ > H₃PO₄
(2) H₃PO₄ > H₃PO₃ > H₃PO₂
(3) H₃PO₃ > H₃PO₂ > H₃PO₄
(4) H₃PO₂ > H₃PO₄ > H₃PO₃

13.

Peroxoacids of sulphur among the following is -
1. H₂SO₅ and H₂S₂O₈
2. H₂SO₅ and H₂S₂O₇
3. H₂S₂O₇ and H₂S₂O₈
4. H₂S₂O₆ and H₂S₂O₇

14.

A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When excess of this gas reacts with NH₃ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from _________.
1. – 3 to +3
2. – 3 to 0
3. – 3 to +5
4. 0 to – 3

15.

In solid state PCl₅ is a _________.
1. covalent solid
2. octahedral structure
3. ionic solid with [PCl₆]⁺ octahedral and [PCl₄]^– tetrahedra
4. ionic solid with [PCl₄]⁺tetrahedral and [PCl₆]^– octahedra

16.

Which is incorrect?
1. $P b l_{2} + l_{2} \to P b l_{4}$
2. In diborane 'B' is $s p^{3}$ hybridised
3. Pyrosilicate contains $S i_{2} {O_{7}}^{6 -}$
4. Borax has 8 mole of water of crystallisation per mole

17.

The stability of dihalides of group 14 elements follow which of the order?
1. $S i C l_{2} < G e C l_{2} < P b C l_{2} < S n C l_{2}$
2. $G e C l_{2} < P b C l_{2} < S n C l_{2} < S i C l_{2}$
3. $S i C l_{2} < G e C l_{2} < S n C l_{2} < P b C l_{2}$
4. $G e C l_{2} < S i C l_{2} < P b C l_{2} < S n C l_{2}$

18.

Which one of the following compounds on strong heating evolves ammonia gas ?
1. ${({NH}_{4})}_{2} S O_{4}$
2. ${HNO}_{3}$
3. ${({NH}_{4})}_{2} C r_{2} O_{7}$
4. ${NH}_{4} {NO}_{3}$

19.

When $I^{-}$ is oxidised by ${MnO}_{4}^{-}$ in alkaline medium, $I^{-}$ converts into-
1. ${IO}_{3}^{-}$
2. $I_{2}$
3. ${IO}_{4}^{-}$
4. ${IO}^{-}$

20.

Which of the following leaves no residue on heating ?
1. $Pb {({NO}_{3})}_{2}$
2. ${NH}_{4} {NO}_{3}$
3. $Cu {({NO}_{3})}_{2}$
4. ${NaNO}_{3}$

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1.	\(\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \)	2.	\(\mathrm{B}_2 \mathrm{O}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \)
3.	\(\mathrm{BF}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \)	4.	\(\mathrm{B}_3 \mathrm{~N}_3 \mathrm{H}_6, \mathrm{~B}_2 \mathrm{H}_6\)

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