A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is
zinc sulphate
zinc carbonate
lead sulphate
lead carbonate
B.
zinc carbonate
Solid (A) on heating gives off a gas which turns lime water milky it means the gas is carbon dioxide. ZnO becomes yellow when hot, white when cold.
Note : Zinc sulphate on heating doesn't show yellow colour.
Which of the following compounds exhibits optical isomerism?
CH3CH2COOH
CH3CHOHCOOH
CH3CH2CH2OH
CH3CHOHCH3
Gasoline is obtained from crude petroleum oil by its
fractional distillation
vacuum distillation
steam distillation
pyrolysis
Alkene which on ozonolysis yields acetone, is
CH2=CH-CH2-CH3
CH3-CH=CH2
CH3-CH=CH-CH3
(CH3)2-C=C-(CH3)2