Q. No.\(\small{\begin{gathered} 3 \mathrm{Cu}(s)+8 \mathrm{HNO}_3(a q) \rightarrow 2 \mathrm{NO}(g)+3 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(a q)+4 \mathrm{H}_2 \mathrm{O}(l) \end{gathered}}\)
| 1. | Cu | 2. | H |
| 3. | N | 4. | O |
1. ClO2-
2. PO43-
3. S2O32-
4. NO2+
| Assertion (A): | In the following chemical reaction between \(H_2S(g)\) and \(Cl_2(g)\), \(H_2S(g)\) is oxidized to \(S(s)\) \(H_2S(g) +Cl_2(g) \rightarrow 2HCl(g) +S(s) \) |
| Reason (R): | Electropositive element, hydrogen has been removed from S. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Which of the following compounds has an element exhibiting two differrent oxidation states?
| 1. | NH2OH | 2. | NH4NO3 |
| 3. | N2H4 | 4. | N3H |
\(2PbO + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O\)
1. Combination reaction
2. Redox reaction
3. Acid-base reaction
4. Disproportion reaction
Given that:
\(\begin{aligned} &E_{\mathrm{O}_{2} / \mathrm{H}_{2} \mathrm{O}}^{\Theta}=+1.23 \mathrm{~V} ; E_{S_{2} \mathrm{O}_{8}^{2-} / \mathrm{{SO}_{4}}^{-2}}=2.05 \mathrm{~V} \\ &E_{\mathrm{Br}_{2} / \mathrm{Br}^{-}}^{\Theta}=+1.09 \mathrm{~V} ; E_{A u^{3+} / A u}^{\Theta}=+1.4 \mathrm{~V} \end{aligned}\)
Which of the following is the strongest oxidizing agent?
1. \(\mathrm{S}_2 \mathrm{O}_8^{2-}\)
2. \(\mathrm{O}_2\)
3. \(A u^{3+}\)
4. \(B r_2\)
What is the oxidation number of Cl in \(\text{CaOCl}_2\) (bleaching powder)?
1. Zero, because it contains Cl2
2. -1, because it contains Cl-
3. +1, because it contains ClO-
4. +1 and -1 because it contains ClO- and Cl-
For the reaction:
Fe3O4 (s) + Al (s) → Fe (s) + Al2O3 (s)
Which of the following statements about the reaction are correct?
| a. | Stoichiometric coefficient of Fe is 9. |
| b. | Aluminium is oxidized. |
| c. | Ferrous ferric oxide (Fe3O4) is oxidized. |
| d. | Aluminium is reduced. |
1. a, c
2. a, b
3. b, c
4. c, d
If the oxidation numbers of A, B, and C are + 2, +5, and –2 respectively, then the possible formula of the compound is:
| 1. | A2(BC2)2 | 2. | A3(BC4)2 |
| 3. | A2(BC3)2 | 4. | A3(B2C)2 |
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