Death due to gunshot is caused by poisoning of:
1. Hg
2. Pb
3. Fe
4. As
Consider the following reaction
The correct statement among the following is -
1. (A) is
2. (C) is
3. (C) is
4. (B) is
Carbogen is:
1. A mixture of .
2. Used by pneumonia patients for respiration.
3. Used by victims of for respiration.
4. All of the above.
Carbon dioxide is a gas but silica is a solid because:
1. Carbon dioxide is composed of discrete covalent molecules whereas silica has a continuous tetrahedral structure.
2. molecules are lighter than molecules.
3. is more acidic than .
4. The melting point of silica is very high.
Assertion: The total number of coordinate bonds and covalent bonds in borazine is 3 and 12 respectively.
Reason: Its structure is similar to benzene.
1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but Reason is false.
4. Both Assertion and Reason are false statements.
Assertion: Boron always forms a covalent bond.
Reason: Boron has a diagonal relationship with silicon.
1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but Reason is false.
4. Both Assertion and Reason are false statements.
Assertion: B-X bond length in is shorter than the expected value.
Reason: back bonding occurs between B and X.
1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but Reason is false.
4. Both Assertion and Reason are false statements.
A compound X, of boron, reacts with on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating with Lithium aluminium hydride. The compounds X and Y are represented by the formulas -
1. | \(\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \) | 2. | \(\mathrm{B}_2 \mathrm{O}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \) |
3. | \(\mathrm{BF}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6 \) | 4. | \(\mathrm{B}_3 \mathrm{~N}_3 \mathrm{H}_6, \mathrm{~B}_2 \mathrm{H}_6\) |
Ionization enthalpy () for the elements of Group 13 follows the order.
1. | B > Al > Ga > In > Tl | 2. | B < Al < Ga < In < Tl |
3. | B < Al > Ga < In > Tl | 4. | B > Al < Ga > In < Tl |
The products formed by the oxidation of are:
1.
2.
3.
4.