Allotropes

Q. Assertion :In aqueous solution, $S{O}_2$ reacts with $H_{2}S$ forming sulphur. Reason: $S{O}_2$ is an effective reducing agent.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. When $H_{2}S$ is passed through nitric acid solution the products formed are-

1. $\beta -$ sulphur
2. $\gamma -$ sulphur
3. Colloidal sulphur
4. Milk of sulphur

Q. Assertion :Sometimes it happens that when $H_{2}S$ gas is passed into solutions in .dil. HCl, yellowish white turbidity appears. Reason: The yellowish turbidity is due to colloidal sulphur, formed by oxidation of $H_{2}S$ by the presence of $N{O}_3^{-}$ or $N{O}_2^{-}orS{O}_3^{2-}$
$H_{2}S+HN{O}_3⟶S$(colloidal)
Before passing $H_{2}S$ gas, solution is boiled so as to decompose these radicals.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of the following compound is formed when Sodium thiosulphate reacts with some strong oxidizing agents: (i.e., dichromate solution)

1. Only sulphate ions
2. Only colloidal sulphur.
3. $S{O}_4^{2-}$ and colloidal sulphur
4. $N{a}_2{S}_4{O}_6$

Q. When $H_{2}S$ is passed through nitric acid solution the products formed are-

1. $\beta -$ sulphur
2. $\gamma -$ sulphur
3. Colloidal sulphur
4. Milk of sulphur