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List of 22 Important Chemistry Questions and Answers

The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the

development of

A. atomic structureB. metallurgyC. periodic table of contents

D. discovery of elements

The National Chemical aboratory is situated in

A. New Delhi

B. BangaloreC. !une

D. !atna

The human body is made up of several chemical elements" the element present in the highest

proportion #$%&' in the body is

A. carbon

B. hydrogenC. o(ygen

D. nitrogen

The hardest form of carbon is

A. co)eB. graphiteC. diamond

D. charcoal

The metal does not give *+ on treatment with dilute *C is

A. n

B. -eC. Ag

D. Ca

The gas used for artificial ripening of green fruit is

A. ethylene

B. ethaneC. carbon dio(ide

D. acetylene

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The first metal used by man was

A. iron

B. copperC. gold

D. brone

The mass number of a nucleus is

A. always less than its atomic number

B. the sum of the number of protons and neutrons present in the nucleusC. always more than the atomic weight

D. a fraction

The oil used in the froth flotation process is

A. coconut oil

B. olive oilC. )erosene oil

D. pine oil

The main use of salt in the diet is to

A. ma)e the taste of food better

B. produce in small amounts the hydrochloric acid re/uired for the digestion of food C. ease the process of coo)ing

D. increase the solubility of food particles in water

0'. 1olutions are classified into a/ueous and non2a/ueous solutions, based on333333. a' Natureof solute particles

b' Nature of solvent

c' 1ie of the particles

d' Thic)ness of solvent

Answer is4 b'

+'. The solvent used to prepare a/ueous solutions is33333333.

a' 5ater

b' benene

c' )erosene

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d' petrol

Answer is4 a'

6'. A true solution does not show Tyndall effect, because of the333333.

a' Nature of solvent

b' Amount of solute

c' 1ie of the particles

d' Nature of solute

Answer is4 c' 7'.

Tyndall effect is e(hibited by33333333.

a' True solutions

b' 1uspensions

c' Colloidal solutions

d' Crystals

Answer is4 c'

%'. Tyndall effect is producted by33333333.

a' True solutions of light

b' 1cattering of light

c' 8efraction of light

d' Movement of particles

Answer is4 b'

$'. The particle sie in a colloidal solution is 3333333.

a' 0 9 : 0; 9

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b' 0; 9 2 +;;; 9

c' More than +;;; 9

d' ess than 0 9

Answer is4 b'

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Answer is4 c'

0;'. The particle sie of the solute in true solution is3333333.

a' 0 9 : 0; 9

b' 0; 9 2 0;; 9

c' 0;; 9 2 0;;; 9

d' More than0;;; 9

Answer is4 a'

0'.The basicity of 1ulphurous @*+16 acid is 3333333333.

a' 0b' +c' 6

d' 7+'.The basicity of 1ulphurous @*+16 acid is 3333333333.

a' 0

b' +

c' 6d' 7

6'.The basicity of *ydrochloric @*Cl acid is 3333333333.

a' 7b' 6c' +

d' 07'.The basicity of rthophosphoric acid @*6!7 is 33333333333.

a' 0

b' +

c' 6d' 7

%'.Malic acid is present in 3333333333.a' Apples

b' emonsc' Mil)

d' tomatoes$'.(alic acid is present in 33333333333.

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a' emon

b' curd

c' rapes

d' Tomatoes