RRB GROUP D Chemistry Quiz

Question 1:

Newlands law of octaves is applicable up to-

Oxygen

Phosphorous

Potassium

Calcium

Which of the following is not correct about the effects of depletion of ozone layer?

It lead to ageing of skin, cataract, sunburn and skin cancer

It also increases evaporation of surface water through the stomata of the leaves

It increase the moisture content of the soil.

Increase in UV radiations damage paints and fibres

Which one of the following reaction does not result in the evolution of Hydrogen gas ?

Reaction of zinc metal with dilute sulphuric acid

Mixing water to plaster of paris

Heating zinc metal with sodium hydroxide

Reaction of potassium metal with water

Which of the following rays produce maximum luminosity on ZnS screen ?

Beta rays

Alpha rays

Gamma rays

Delta rays

Azeotropic mixtures are

Mixture of two solids

Those which boil at different temperature

Those which can be fractionally distilled

The constant boiling point mixture