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All Physics Chemistry Botany Zoology

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Match the interhaIogen 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

Code
A B C D

(iii) (iv) (i) (ii)

(iii) (i) (iv) (ii)

(v) (iv) (iii) (ii)

(iv) (iii) (ii) (i)

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Explanation

(b) Two different halogens may react to form interhalogen compounds as

XX' (ClF,BrF,BrCl,IF,ICl) Linear

XX'₃ (ClF₃,BrF₃,IF₃,ICl₃) Bent T-shaped

XX'₅ (ClF₅,BrCl₅,IF₅) Square-pyramidal

XX'₇ (IF₇) Pentagonal bipyramidal

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It is because inability of ns² electrons of the valence shell to participate in bonding that

Sn²⁺ is reducing while Pb⁴⁺ is oxidising agent

Sn²⁺ is oxidising while Pb⁴⁺ is reducing agent

Sn²⁺ and Pb²⁺ are both oxidising and reducing agent

Sn⁴⁺ is reducing while Pb⁴⁺ is oxidising agent

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Explanation

(a) The inability of ns² electrons of the valence shell to participate in bonding is called as inert pair effect. Due to this effect, the lower oxidation state becomes more stable on descending the group. Thus, Sn²⁺ is a reducing agent while Pb⁴⁺ act as an oxidising agent.

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AlF₃ is soluble in HF only in presence of KF. It is due to the formation of

K₃[AIF₃H₃]

K₃[AIF₆]

AlH₃

K[AIF₃H]

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Explanation

(b) Key Idea Al³⁺shows maximum coordination number 6, thus it will form ${AF}_{6}^{- 3}$

AIF₃ forms K₃[AIF₆] when dissolved in HF in the presence of KF as shown below:

${AlF}_{3} + 3 KF \overset{HF}{\to} K_{3} [{AlF}_{6}]$

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

Cu + 2H₂SO₄ $\to$ CuSO₄ + SO₂ + 2H₂O

3S + 2H₂SO₄ $\to$ 3SO₂ + 2H₂O

C + 2H₂SO₄ $\to$ CO₂ + 2SO₂ + 2H₂O

CaF₂ + H₂SO₄ $\to$ CaSO₄ + 2HF

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Explanation

The reaction of CaF2 with H2SO4 does not involve any oxidation process. It is an acid-base reaction where HF is formed. The other reactions given involve the oxidation of Cu, S, and C by hot concentrated H2SO4 acting as an oxidizing agent.

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Among the following, which one is a wrong statement?

PH₅ and BiCl₅ do not exist

ρp-dp bonds are present in SO₂

SeF₄ and CH₄ have same shape

$I_{3}^{+}$ has bent geometry

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Explanation

The statement that SeF4 and CH4 have the same shape is incorrect. SeF4 has a see-saw shape (distorted tetrahedral), while CH4 has a tetrahedral shape. The other statements given are correct.

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When copper is heated with conc. HNO₃ it produces

Cu(NO₃)₂ and NO

Cu(NO₃)₂,NO and NO₂

Cu(NO₃)₂ and N₂O

Cu(NO₃)₂ and NO₂

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Explanation

(d) Nitric acid acts as an oxidising agent while reacting with copper. When dil. HNO₃ reacts, reaction proceeds as:

$3 Cu + 8 {HNO}_{3} (dil .) \overset{}{\to} 3 Cu {({NO}_{3})}_{2} + 2 NO + H_{2} O$

and when conc. HNO₃ is used, reaction proceeds as

$Cu + 4 {HNO}_{3} (conc .) \overset{}{\to} Cu {({NO}_{3})}_{2} + 2 NO 2 + 2 H_{2} O$

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Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option.

Column I Column II
A. XeF₆ 1. Distorted octahedral
B. XeO₃ 2. Square planar
C. XeOF₄ 3. Pyramidal
D. XeF₄ 4. Square pyramidal

Codes
A B C D

1 2 4 3

4 3 1 2

4 1 2 3

1 3 4 2

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Which is the correct statement for the given acids?

Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid

Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid

Both are triprotic acids

Both are diprotic acids

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The product obtained as a result of a reaction of nitrogen with CaC₂ is:

CaCN

CaCN₃

Ca₂CN

CaCN₂

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Explanation

(d) When calcium carbide (CaC₂) reacts with nitrogen (N₂) under high temperature, it forms calcium cyanamide which is also called nitrolim.

CaC₂ + N₂ $\to_{temperature}^{High}$ CaCN₂ + C

Calcium cyanamide

Hence, option (d) should be CaCN₂ instead of Ca(CN)₂

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Maximum bond angle at nitrogen is present in which of the following?

NO₂

NO_2^-

NO_2⁺

NO3_^-

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Explanation

Species Hybridisation Bond angle
NO₂ sp 120°
NO_2^- sp₂ 115.4°
NO_2⁺ sp(linear) 180°
NO_3^- sp₂ 120°

So, No₂⁺ has maximum bond angle.

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