(A) Roasting
(B) Calcination
(C) Froth Flotation process
(D) Distillation
Permanent hardness can be removed by adding?
(A) Soda lime
(B) Lime water
(C) Quick lime
(D) Na2 zeolite
___ protects the earth surface from ultraviolet radiations.
(A) N2
(B) O3
(C) CO
(D) CO2
___ is a disaccharide.
(A) Fructose
(B) Glucose
(C) Starch
(D) Sucrose
Alkenes are prepared from alcohols by a process called?
(A) Dehydration
(B) Dehydrogenation
(C) Dehalogenation
(D) Dehydro Halogenation
In laboratory urea was prepared by?
(A) Rutherford
(B) Wohler
(C) Berzellius
(D) Dalton
A reaction between an acid and base produces?
(A) Salt and gas
(B) Salt and water
(C) Salt and acid
(D) Salt and base
If a liquid has PH 7 then it must?
(A) Be a colourless and odourless liquid
(B) Freeze at 0 Degree centigrade and boil at 100 degree centigrade
(C) Be neutral
(D) Be a solution containing water