Given below are two statements:
Assertion (A): | Fluorine exhibits only –1 oxidation state whereas other halogens exhibit + 1, + 3, + 5 and + 7 oxidation states. |
Reason (R): | Other halogens have d orbitals and therefore, can expand their octets and show +1, +3, +5 and +7 oxidation states also. |
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. |
The incorrect statement among the following is-
1. | Cl2 reaction with hot and concentrated NaOH produces NaCl andNaClO3. |
2. | Cl2 reaction with hot and concentrated NaOH produces NaCl and NaOCl. |
3. | It is an example of disproportionation reaction. |
4. | Chlorine from zero oxidation state is changed to –1 and +5 oxidation states. |
HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride because:
1. | Formation of Cl2 gas prevents ferric chloride formation |
2. | Formation of H2 gas prevents ferric chloride formation |
3. | Formation of [FeCl6]4- prevent ferric chloride formation |
4. | Formation of Fe3H prevents ferric chloride formation |
Assertion (A): | The elements of Group 18 are known as noble gases. |
Reason (R): | Group 18 elements are highly reactive. |
The correct option is-
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. |
Given below are two statements:
Assertion (A): | Noble gases have very low boiling points. |
Reason (R): | Noble gases, being monoatomic, have no interatomic forces except weak dispersion forces. |
The correct option is:
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. |
Assertion (A): | The hydrolysis of XeF6 is a redox reaction. |
Reason (R): | The hydrolysis products of XeF6 are XeOF4 and XeO2F2 |
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. |
Given below are two statements:
Assertion (A): | Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine. |
Reason (R): | F2 has low enthalpy of dissociation and F– has high hydration enthalpy |
The correct option is-
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. |
Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table because-
1. It has smallest size and high effective nuclear charge
2. It has the largest size in in the respective periods
3. It is a strong reducing agent
4. None of the above
Given below are two statements:
Assertion (A): | Sulphur shows paramagnetic behaviour. |
Reason (R): | S2 does not contain unpaired electron. |
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. |