Which of the following is /are correct ?...

Which of the following is /are correct ?

During mono nitration of benzene with conc. `H_(2)SO_(4)` and conc. `HNO_(3)` temperature should not be allowed to exceed `60^(@)C`

In nitrating mixture `(HNO_(3)+H_(2)SO_(4)), HNO_(3)` acts as base

Electrophilic substitution in aromatic compounds involves arenium ion

Nitrogen and `H_(2)SO_(4)` can be used an nitrating mixture

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The correct Answer is:

A, B, C

`(HNO_(3)+H_(2)SO_(4))` mixture is nitration miixture

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Which of the following is not correct ?

Temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium in it

Permutit is an artificial zeolite

`H_2O_2` acts as an oxidizing agent in the following reaction:
`Cl_2 +H_2O_2 to O_2 + 2HCl`

`H_2O_2` is used as bleaching agent for delicate textiles

Anhydrous `AlCl_(3)` exists as `Al_(2)Cl_(6)`

Anhydrous `AlCl_(3)` sublimes an heating

Anhydrous `AlCl_(3)` fumes in air

Anhydrous `AlCl_(3)` is ionic

Pyrrole is more basic than pyridine

All the C-C bonds in Naphthalene are identical

All O,P-orienting groups need not be activating

`-CF_3` is meta orienting group