HgS is...

HgS is

red in colour

black in colour

Both (A) and (B)

none.

Text Solution

Verified by Experts

HgS can exist both in red form and black form. Passing `H_(2)S` through a solution of `Hg^(2+)` salts gives black HgS. This black HgS on sublimation gives red form.

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The roasting of HgS in air produces

`HgO`

`HgCl_2`

`HgSO_4`

`Hg`

Total vapour pressure of mixture of 1 mole of volatile component A (P_(A)^(@)=100 mm Hg) and 3 mole of volatile component B (P_(B)^(@)=80 mm Hg) is 90 mm Hg . For such case :

there is positive deviation from Raoult's law

boiling point has been lowered

force of attraction between A and B is smaller than that between A and A or between B and B

all the above statements are correct

The total vapour pressure of a mixture of 1 mole of A ( P_A = 200 mm Hg ) and 3 mole of B ( P_B= 360 mm Hg) is 350 mm Hg. Then

There is no deviation from Raoult's law

There is positive deviation from Raoult's law

There is negative deviation from Raoult's law

Molecular masses of A and B are also required