DIRECTION: These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Silicones are hydrophobic in nature.
Statement-2 :Si – O – Si linkages are moisture sensitive.

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

DIRECTION: These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Benzene is reactive while inorganic benzene is unreactive compound.
Statement-2 :Inorganic benzene is, borazine, B₃N₃H₆

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

Solution

Borazine has more polarity as compared to benzene because nitrogen is more and boron is less electronegative than carbon. Thus due to polarity inorganic benzene, borazine is highly reactive while benzene is much less reactive.

DIRECTION: These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Boron is metalloid.
Statement-2 :Boron shows metallic nature.

Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement-1 is True,Statement-2 is False
Statement-1 is False, Statement-2 is True

Solution

Boron is metalloid. Thus assertion is correct. Metalloids possess,metallic as well as non-metallic nature. Hence,reason is false.

The species present in solution when CO₂ is dissolved in water are

CO₂ ,H₂CO₃,\(HCO_{3}^{-}\),\(CO_{3}^{2-}\)
H₂CO₃,\(CO_{3}^{2-}\)
\(CO_{3}^{2-}\),HCO₃
CO₂, H₂CO₃

Solution

CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + \(HCO_{3}^{-}\) ⇌ 2H⁺ \(CO_{3}^{2-}\)

How can the following reaction be made to proceed in forward direction?
B(OH)₃ + NaOH ⇌ NaBO₂ + Na[B(OH)₄] + H₂O

addition of borax
addition of c is-1,2-diol
addition of Na₂HPO₄
addition of trans-1,2-dio

Solution

When PbO₂ reacts with conc. HNO₃ the gas evolved is

NO₂
O₂
N₂
N₂O

Solution

PbO₂ is a powerful oxidizing agent and liberate O₂ when treated with acids.
2PbO₂ + 4HNO₃ ⟶ Pb(NO₃)₂ + 2H₂O + O₂ ↑

Solution

Negative Δ_rG° value indicates that + 2 oxidation state is more stable for Pb. Also it is supported by inert pair effect that + 2 oxidation state is more stable for Pb and as Δ_rG° value is positive in second reaction it indicates that + 4 oxidation state is more stable for Sn.i.e., Sn⁺⁺ < Pb⁺⁺, Sn⁴⁺ > Pb⁴⁺.

Heating an aqueous solution of aluminium chloride to dryness will give

Al(OH)Cl₂
Al₂Cl₆
Al₂Cl₆
AlCl₃

Solution

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