Q. No.
Which of the following explains why aluminium becomes passive in nitric acid?
1. It is a noble metal
2. It forms a thin film of oxide
3. It has positive reduction potential
4. None of the above
reacts with which of the following?
1. Only water
2. Only acids
3. Only alkalies
4. Both acids and alkalies
Which of the following represents the correct increasing order of stability of the +1 oxidation state among Al, Ga, In, and Tl?
1. Ga < ln < Al < Tl
2. Al < Ga < ln < Tl
3. Tl < ln < Ga < Al
4. ln < Tl < Ga < Al
Which of the following types of metals respond to the borax bead test?
1. Divalent metals
2. Heavy metals
3. Light metals
4. Metals that forms coloured metaborates
| Assertion (A): | Boron is the hardest element in group 13. |
| Reason (R): | High lattice enthalpy is due to the strong crystalline lattice. |
| 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 |
The correct statements among I to III regarding group 13 element oxides are:
(I) Boron trioxide or diboron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
1. (I) and (II) only
2. (I) and (III) only
3. (II) and (III) only
4. (I), (II), and (III) only
The element which exists in a liquid state for a wide range of temperatures and can be used for measuring high temperature is:
| 1. | B | 2. | Al |
| 3. | Ga | 4. | In |
Which of the following reasons explain why gallium has a smaller atomic radius than aluminium?
a. Poor screening effect of d and f orbitals
b. Increase in nuclear charge
c. Presence of higher orbitals
d. Higher atomic number
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
1. K
2. Ga
3. Al
4. Mg
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