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
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 and 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): 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 assertion and reason are true and reason is the correct explanation of the assertion.
2. Both assertion and reason are true but reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Assertion is false but reason 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 prevent ferric chloride formation
2. Formation of H2 gas prevent ferric chloride formation
3. Formation of [FeCl6]4- prevent ferric chloride formation
4. Formation of Fe3H prevent ferric chloride formation