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Assertion: Amongest the halogens, fluori...

Assertion: Amongest the halogens, fluorine can oxidise the elements to the highest oxidation- state.
Reason: Due to small size of fluoride ion, it is difficult to oxidise fluoride ion to fluorine. Hence reverse reaction takes place more easily.

A

If both the assertion and reason are true and reason is the true explanation of the assertion.

B

If both the assertion and reason are ture but the reason is not the correct explanation of assertion

C

If the assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
Due to high electronegativity and high heat of dissociation, fluorine oxidises the elements to their oxidation state.
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Statement-1: the highest oxidation state of transition metal is exhibited in its oxide or fluoride only. Statement-2: Small size and high electronegativity of O and F can oxidise the metal to its highest oxidation state.

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All the noble gases are colourless and tasteless monoatomic gases. In general, noble gases are least reactive and their inertness to chemical reactivity is attributed to the following reasons. Reactive and their inertness to chemical reactivity is attributed to the following reasons. (i)Except helium, all have completely filled ns^(2)np^(6) electronic configuration in their valence shells. (ii)All have high ionisation enthalpy and more positive electron gain enthalpy. However, a number of xenon compounds mainly with most electronegative elements like fluorine and oxygen have been synthesized under different conditions and fluorides of xenon have been used as an oxidising agent and a fluorinating agent in many of the chemical reactions The correct order of the abundance of various noble gases in air is :

Knowledge Check

  • Assertion : Decomposition of hydrogen peroxide is an example of disproportionation reaction. Reason : In a disproportionation reaction, an element in one oxidation state is simultaneously oxidised and reduced .

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Statement-1: the highest oxidation state of transition metal is exhibited in its oxide or fluoride only. Statement-2: Small size and high electronegativity of O and F can oxidise the metal to its highest oxidation state.

    A
    Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1.
    B
    Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1
    C
    Statement-1 is true, statement-2 is false.
    D
    statement-1 is false, statement-2 is true.

  • Assertion (A) : The carbonate of lithium decomposes easily on heating to form lithium oxide and CO_(2) . Reason (R) : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable

    A
    Both A and R are correct and R is the correct explanation of A.
    B
    Both A and R are correct but R is not the correct explanation of A.
    C
    Both A and R are not correct
    D
    A is not correct but R is correct.