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Q. No.What is the symbol for the element that forms a protective oxide coating?
1. K
2. Ga
3. Al
4. Mg
Subtopic: Boron Family- Preparations, Properties & Uses |
84%
Level 1: 80%+
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Identify the Incorrect statement:
| 1. | Carbon has the tendency to form chains and rings with itself. |
| 2. | Silicon and Germanium are useful in semiconductor industry. |
| 3. | Boron trifluoride is a Lewis acid. |
| 4. | Common oxidation states of group 14 elements are +1 and +3. |
Subtopic: Structure & Properties of Allotropes of C |
80%
Level 1: 80%+
NEET - 2024
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The element that does NOT show catenation among the following is :
1. \(\text {Ge}\)
2. \(\text {Si}\)
3. \(\text {Sn}\)
4. \(\text {Pb}\)
1. \(\text {Ge}\)
2. \(\text {Si}\)
3. \(\text {Sn}\)
4. \(\text {Pb}\)
Subtopic: Carbon Family - Preparations, Properties & Uses |
80%
Level 1: 80%+
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Which of the following statements is/are correct for allotropes of carbon?
| 1. | Graphite is a conductor of electricity. |
| 2. | Diamond has all sp3 carbon atoms. |
| 3. | Graphite is more stable thermodynamically than diamond. |
| 4. | All of the above. |
Subtopic: Compounds of Carbon, Preparations, Properties & Uses |
86%
Level 1: 80%+
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Consider the given two statements:
| 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 |
Subtopic: Boron Family- Preparations, Properties & Uses |
84%
Level 1: 80%+
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\(BCl_3 \) accepts a lone pair of electrons from \(NH_3 \) to form y. The geometry of y is different from that of \(BCl_3 \). Select the correct option for y and change in geometry from \(BCl_3 \) to y :
1. \(y = BCl_3.NH_3 ~; \) planar to tetrahedral.
2. \(y = BCl_3.NH_3 ~; \) planar to square planar.
3. \(y = B(NH_3)Cl ~Cl_2 ~; \) planar to tetrahedral.
4. \(y = B(NH_2Cl_3) ~HCl ~; \) planar to square planar.
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
77%
Level 2: 60%+
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Identify A and B in the following reaction
\(H_{3}BO_{3}\xrightarrow[>370 K]{\Delta } A \xrightarrow[]{\Delta }B\)
1. \(A = HBO_2 , ~B= B_2O_3\)
2. \(A = BH_3 , ~~B= B_2O_3\)
3. \(A =B_2O_3, ~B = HBO_2\)
4. \(A =BH_3, ~B = HBO_2\)
\(H_{3}BO_{3}\xrightarrow[>370 K]{\Delta } A \xrightarrow[]{\Delta }B\)
1. \(A = HBO_2 , ~B= B_2O_3\)
2. \(A = BH_3 , ~~B= B_2O_3\)
3. \(A =B_2O_3, ~B = HBO_2\)
4. \(A =BH_3, ~B = HBO_2\)
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
78%
Level 2: 60%+
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Out of CCl4, SiCl4, SnCl4, and PbCl4, the compound that will not be easily hydrolyzed by water is:
1. CCl4
2. SiCl4
3. SnCl4
4. PbCl4
1. CCl4
2. SiCl4
3. SnCl4
4. PbCl4
Subtopic: Carbon Family - Preparations, Properties & Uses | Properties of Glass, Pb & Sn compounds |
78%
Level 2: 60%+
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Match List-I with List-II:
Choose the correct answer from the options given below :
| List-I (Compounds) |
List-II (Molecular formula) |
||
| (a) | Borax | (i) | NaBO2+B2O3 |
| (b) | Kernite | (ii) | Na2B4O7.4H2O |
| (c) | Orthoboric acid | (iii) | H3BO3 |
| (d) | Borax bead | (iv) | Na2B4O7.10H2O |
Choose the correct answer from the options given below :
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (ii) | (iii) | (i) |
| 2. | (ii) | (iv) | (iii) | (i) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (i) | (iii) | (iv) | (ii) |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
81%
Level 1: 80%+
NEET - 2022
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Consider the given two statements:
| Assertion (A): | CCl4 is insoluble in water while SiCl4 is soluble in water. |
| Reason (R): | Si in SiCl4 can accommodate the lone pair of electrons in d-orbitals obtained from the oxygen atom of water molecules. |
| 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. |
Subtopic: Properties of Structure of SiO2 & Other Compounds |
87%
Level 1: 80%+
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