Which of the following statements is/are...

Which of the following statements is/are not correct ?

Aluminium wire is used in Beilstein test

Nitrogen gas is quantitatively estimated in Dumas method

In Kjeldahl's method, organic compound is reacted with conc, `H_(2)SO_(4).K_(2)SO_(4)` is also added.

All organic compounds contain both C and H.

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The correct Answer is:

B, C, D

(c ) Not applicable to pyridine, compounds containing N-N and N-O bonds, atc.
(d) Estimated magnesium pyrrophosphate `(Mg_(2)P_(2)O_(7))`.

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Which of the following statement is/are not correct?

I.P. increases down the group

I.P. of s-block element is less than corresponding d-block elements

If `Delta` I.P. `gt` 16 eV, higher oxidation state is more stable

I.P. of halogen elements is maximum in their respective period

Chlorobenzene is more reactive than benzene towards electrophilic substitution reactions

C - Cl bond in chlorobenzene is less polar than in `CH_3Cl`

Chlorobenzene is less reactive than `CH_3C` l towards nucleophilic substitution reactions

In chlorobenzene further substitution take place at ortho and para position

Coenzymes increase the catalytic activity of enzyme

Catalyst does not initiate any reaction

The value of equilibium constant is changed in the presence of a catalyst in the reaction at equilibrium

Enzymes catalyse mainly bio-chemical reactions