(i) a) Arrange the following in the increasing order of thermal stabil

1.	(i) a) Arrange the following in the increasing order of thermal stability: H2O, H2S, H2Se, H2Te b) Give the formula of the brown ring formed at the interface during the ring test for nitrate. (ii) A greenish yellow gas ‘A’ with pungent and suffocating odour, is a powerful bleaching agent. ‘A’ on treatment with dry slaked lime it gives bleaching powder. Identify ‘A’ and explain the reason for its bleaching action. Write the balanced chemical equation for the reaction of ‘A’ with hot and concentrated NaOH.
Answer» (i)(a) H₂Te, H₂Se, H₂S, H₂O (b) [Fe (H₂O)₅ (NO)]²⁺ (ii) A is chlorine gas Its bleaching action is due to oxidation. Cl₂ + H₂O → 2HCl + O , Coloured substance + O → Colourless substance 6 NaOH + 3Cl₂ → 5NaCl + NaClO₃ + 3H₂O

(i) a) Arrange the following in the increasing order of thermal stability: H2O, H2S, H2Se, H2Te b) Give the formula of the brown ring formed at the interface during the ring test for nitrate. (ii) A greenish yellow gas ‘A’ with pungent and suffocating odour, is a powerful bleaching agent. ‘A’ on treatment with dry slaked lime it gives bleaching powder. Identify ‘A’ and explain the reason for its bleaching action. Write the balanced chemical equation for the reaction of ‘A’ with hot and concentrated NaOH.

Answer»

(i)(a) H₂Te, H₂Se, H₂S, H₂O

(b) [Fe (H₂O)₅ (NO)]²⁺

(ii) A is chlorine gas

Its bleaching action is due to oxidation.

Cl₂ + H₂O → 2HCl + O , Coloured substance + O → Colourless substance

6 NaOH + 3Cl₂ → 5NaCl + NaClO₃ + 3H₂O

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