Q. No.In which of the following compounds, an element exhibits two different oxidation states:
1. NH2OH
2. NH4NO3
3. N2H4
4. N3H
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Which of the following elements does not show disproportionation tendency?
| 1. | Cl | 2. | Br |
| 3. | F | 4. | I |
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Match column I with column II for the oxidation states of the central atoms.
Column I Column II
(i) Cr2O72- (a) +3
(ii) MnO4- (b) +4
(iii) VO3- (c) +5
(iv) FeF63- (d) +6
(e) +7
1. (i)-(d), (ii)-(e), (iii)-(c), (iv)-(a)
2. (i)-(c), (ii)-(e), (iii)-(a), (iv)-(d)
3. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)
4. (i)-(b), (ii)-(c), (iii)-(d), (iv)-(e)
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Match the items in Column I with relevant items in Column II.
Column I Column II
(i) Ions having positive charge (a) +7
(ii) The sum of oxidation number of (b) -1
all atoms in a neutral molecule (c) +1
(iii) Oxidation number of hydrogen ion (H+) (d) 0
(iv) Oxidation number of fluorine in NaF (e) Cation
(v) Ions having negative charge (f) Anion
1. (i)-(e), (ii)-(d), (iii)-(c), (iv)-(b), (v)-(f)
2. (i)-(a), (ii)-(d), (iii)-(c), (iv)-(b), (v)-(f)
3. (i)-(e), (ii)-(d), (iii)-(a), (iv)-(b), (v)-(f)
4. (i)-(b), (ii)-(d), (iii)-(e), (iv)-(a), (v)-(f)
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values of some redox couples are given below. On the basis of these values choose the correct option.
\(\begin{aligned} &\mathrm{E}^{\ominus} \text { values : } \mathrm{Br}_2 / \mathrm{Br}^{-}=+1.90 ; \mathrm{Ag}^{+} / \mathrm{Ag}(\mathrm{s})=+0.80\\ &\mathrm{Cu}^{2+} / \mathrm{Cu}(\mathrm{s})=+0.34 ; \mathrm{I}_2(\mathrm{~s}) / \mathrm{I}^{-}=+0.54 \end{aligned}\)1. Cu will reduce Br-
2. Cu will reduce Ag
3. Cu will reduce I-
4. Cu will reduce Br2
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1.250 g of metal carbonate was treated with 500 mL of 0.1 M HCl solution. The unreacted HCl required 50.0 mL of 0.500 M NaOH solution for neutralization. Identify the metal M
1. Mg
2. Ca
3. Sr
4. Ba
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