Which of the following is correct regard...

Which of the following is correct regarding the reaction of alkali metals with halogens ?

Alkali metals react vigorously with halogens to form ionic halides `M^(+)X^(-)`,

The reactivity of alkali metals towards a particular halogen increases as we move down the group from Li to Cs.

The reactivity of halogens towards a particular alkali metal decreases from `F_(2) "to" I_(2)`

All of these.

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The correct Answer is:

`2M(s)+X_(2)to2M^(+)X^(-)`
Reactivity of alkali metals increases down the group because of decrease of ionization enthalpy.

Which of the following is incorrect regarding the reaction of alkali metals with hydrogen ?

All the alkali metals react with dihydrogen on heating to form colorless crystalline ionic hydrides `M^(+)H^(-)`.

The order of reactivity of the alkali metals towards dihydrogen increases as we go down the group.

The ionic character of the hydrides decreases from Li to Cs.

The stability of these hydrides decreases from LiH to CsH.

Here selectively carbonyl group will be reduced.

The product obtained is same what it could be in case of the reagent `LiAlH_(4)`

The product will be a racemic mixture

One mole of `NaBH_(4)` reduces four moles of 5-keto haxanoic acid

All alkali metals react with water, liberating `H_(2)` forming alkaline aqueous solution.

The reactivity decreases on moving down the group

Li liberates more energy than the other metals when it reacts with water.

Li metal does not catch fire during its reaction with water.