Q. No.
The reason for the small radius of Ga compared to Al is-.
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)
The linear shape of CO2 is due to _______.
a. sp3 hybridisation of carbon
b. sp hybridisation of carbon
c. bonding between carbon and oxygen
d. sp2 hybridisation of carbon
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Me3SiCl is used during polymerization of organ silicones because
| a. | Chain length of organic silicone polymers can be controlled by adding |
| b. | blocks the end terminal of silicone polymer. |
| c. | improves the quality and yield of the polymer. |
| d. | acts as a catalyst during polymerization. |
Choose the correct option:
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
The correct statements among the following are:
| a. | Fullerenes have dangling bonds. |
| b. | Fullerenes are cage-like molecules. |
| c. | Graphite is, thermodynamically, the most stable allotrope of carbon. |
| d. | Graphite is slippery and hard and therefore used as a dry lubricant in machines. |
1. a and b
2. b and c
3. c and d
4. a and d
Which of the following statements are correct?
(Answer on the basis of the given figure.)
| a. | The two bridged hydrogen atoms and the two boron atoms lie in one plane |
| b. | Out of six B-H bonds, two bonds can be described in terms of 3-center-2-electron bonds |
| c. | Out of six B-H bonds, four B-H bonds can be described in terms of 3 center 2 electron bonds |
| d. | The four-terminal B-H bonds are two center-two electron angular bonds |
Choose the correct option
1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)
Match the species given in Column I with the properties mentioned in Column II.
| Column I | Column II |
| A. \(\text{BF}^-_4\) | 1. Oxidation state of the central atom is +4 |
| B. AlCl3 | 2. Tetrahedral shape |
| C. SnO | 3. Lewis acid |
| D. PbO2 | 4. Can be further oxidized |
Codes:
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Match the species given in Column I with properties given in Column II.
| Column I | Column II | ||
| A. | Diborane | 1. | Used as a flux for soldering metals |
| B. | Quartz | 2. | Crystalline form of silica |
| C. | Borax | 3. | Banana bonds |
| D. | Aluminosilicate | 4. | Used as a catalyst in petrochemical industries |
| A | B | C | D | |
| 1. | 3 | 4 | 1 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 3 | 2 | 1 | 4 |
| 4. | 4 | 1 | 3 | 2 |
Match the species in Column-I with their corresponding hybridisation in Column-II:
| Column-I (Species) | Column-II (Hybridisation) | ||
| A. | Boron in | i. | sp2 |
| B. | Aluminium in | ii. | sp3 |
| C. | Carbon in Buckminsterfullerene | iii. | sp3d2 |
| D. | Germanium in |
Codes:
| A | B | C | D | |
| 1. | ii | iii | i | iii |
| 2. | i | i | iii | ii |
| 3. | iii | ii | ii | i |
| 4. | i | iii | ii | iii |
Given below are two statements:
| Assertion (A): | If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge. |
| Reason (R): | Aluminium is trivalent while silicon is tetravalent. |
| 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. | (A) is False but (R) is True. |
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