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Class 10 Chemistry
Past Papers MCQs
Grand Practice Test

1 / 174

Acid rain has pH less than:

2 / 174

Which gas has lowest percentage in the air?

3 / 174

Ultraviolet radiations are absorbed by ozone in the stratosphere, that is why:

4 / 174

Which is an alcohol?

5 / 174

Plants convert glucose into:

6 / 174

Formic acid contains functional group:

7 / 174

What is the concentration of { H }^{ + } ion in the milk of magnesia?

8 / 174

Which process produces an alkane?

9 / 174

The emission of 𝐶𝑂, 𝑁𝑂 and unburned hydrocarbons can be reduced by using:

10 / 174

Highest temperature in Mesosphere is:

11 / 174

The formula of ammonium carbamate is:

12 / 174

Chemical formula of Slaked lime is:

13 / 174

A drain cleaner contains 1.0 × { 10 }^{ -8 }M, { OH }^{ - } concentration, this solution is:

14 / 174

Which substance is used as antacid and laxative?

15 / 174

In an irreversible reaction, equilibrium is:

16 / 174

Which coloured solution is produced, when Ketones are mixed with alkaline sodium nitro-prusside solution?

17 / 174

Nitrogen dioxide is synthesized according to the given equilibrium.
2NO_{ (g) }+O_{ 2(g) }\rightleftharpoons 2N{ O }_{2 (g) }
The unit of Kc, for this reaction is:

18 / 174

Which of the following is the chemical formula of Haematite?

19 / 174

For a reversible reaction K = \frac { { [C] }^{ 2 } }{ [A][B] } . The correct equation of above expression is:

20 / 174

For a reversible reaction
K_{ C }=\frac { [HI]^{ 2 } }{ [{ H }_{ 2 }][{ I }_{ 2 }] }
which substance is product of the reaction?

21 / 174

For a general reaction 2A + B \rightleftharpoons 2C + D the rate of forward reaction will be equal to:

22 / 174

Reduction of Ethylchloride ({ C }_{ 2 }{ H }_{ 5 }Cl) produces.

23 / 174

Which of the following is used as raw material for Solvay process?

24 / 174

Which of the following is not a source of starch?

25 / 174

Which of the following is not the macroscopic characteristic of forward reaction?

26 / 174

Consider the following reaction,
H_{ 2 }O+HCl\rightleftharpoons { H }_{ 3 }{ O }^{ + }+{ Cl }^{ - } ,
which species is an electron pair acceptor in this reaction?

27 / 174

N{ H }_{ 3 } cannot be classified as a base by:

28 / 174

Addition of Hydrogen in the vegetable oil is due to presence of:

29 / 174

Which of the following is used as domestic fuel?

30 / 174

PbS is the formula of:

31 / 174

Which one of the following vitamins is fat soluble?

32 / 174

Which of the following is a Lewis Base?

33 / 174

Which of following catalysts is used to form { NH }_{ 3 } gas from Nitrogen & Hydrogen gas?

34 / 174

Lowest temperature in stratosphere is:

35 / 174

Which is not a dextrose sugar?

36 / 174

In the following reaction which species is donating an electron pair?
{ NH }_{ 3 }+{ BF }_{ 3 }\rightarrow { H }_{ 3 }N-{ BF }_{ 3 }

37 / 174

Lowest temperature in stratosphere is:

38 / 174

Identify the compound responsible for acid rain:

39 / 174

In which of the following compounds, oxygen is attached to two alkyl groups?

40 / 174

Which of the following is an ore of Aluminum?

41 / 174

Raffinose ({ C }_{ 18 }{ H }_{ 32 }{ O }_{ 16 }) is a:

42 / 174

Which of the following is the functional group of amine?

43 / 174

The temperature inside a green house can be higher than the outside temperature.

44 / 174

Marble buildings and statues are destroyed by acid rain due to reaction of Sulphuric acid with:

45 / 174

Which of the following is used as raw material for preparation of urea?

46 / 174

Which of the following is used for ripening of fruits?

47 / 174

Permanent hardness of water can be removed by:

48 / 174

Which of the following is a Lewis base?

49 / 174

For a reversible reaction K = \frac { { [C] }^{ 2 } }{ [A][B] } . The correct product of above expression is:

50 / 174

Which of the following is a homocyclic compound?

51 / 174

Chemical formula of ammonium carbamate is:

52 / 174

Baeyer’s test is used to detect the presence of:

53 / 174

Compound of _________ helps to ensure antiseptic conditions in hospitals operating rooms.

54 / 174

The linkage which joins two amino acids is called:

55 / 174

Which of the following is used to remove permanent hardness in water?

56 / 174

Which scientist proposed the law of mass action?

57 / 174

Which of the following is an Ether?

58 / 174

Which of the following reacts explosively with methane?

59 / 174

By dehydration we mean the removal of:

60 / 174

Each DNA nucleotide consists of:

61 / 174

Which of the following is not a waterborne disease?

62 / 174

Consider the following reaction,
H_{ 2 }O+HCl\rightleftharpoons { H }_{ 3 }{ O }^{ + }+{ Cl }^{ - } ,
which species is an electron pair acceptor in this reaction?

63 / 174

Most of air pollution is caused by:

64 / 174

Pitch is produced by:

65 / 174

Which of the following process is reduction in nature?

66 / 174

Which of the following acids is used in the manufacturing of many chemicals, drugs, dyes, paints and explosives?

67 / 174

At what pH does Phenolphthalein change its colour?

68 / 174

The volumetric ratio between hydrogen and oxygen in water is:

69 / 174

Which of the followings is not a waterborne disease?

70 / 174

Which of the following substance reacts with to produce ethyleneglycol?

71 / 174

Raffinose ({ C }_{ 18 }{ H }_{ 32 }{ O }_{ 16 }) on hydrolysis forms ______ simple sugars.

72 / 174

Which of the following is a heterocyclic compound?

73 / 174

____________ causes breathing difficulties, asthma and eye irritation.

74 / 174

Active mass means ____________.

75 / 174

What will happen if [O{ H }^{ - }] increases?

76 / 174

Which of the following diseases is caused due to the deficiency of vitamin-A?

77 / 174

When H^{ + } < 1 × 10^{ -7 } M, then solution will be:

78 / 174

Which of the following is a heterocyclic compound?

79 / 174

A double arrow (rightleftharpoons ) indicates.

80 / 174

Which of following reacts with concentrated alkaline KMn{ O }_{ 4 } to produce oxalic acid?

81 / 174

{ K }_{ w } is called ionization constant of water. Its value can be obtained by:

82 / 174

Which product is obtained when chloromethane (or methyl chloride) is reduced?

83 / 174

Ice floats over liquid water because:

84 / 174

Which of the following acids is found in Butter?

85 / 174

The functional group of Amines is

86 / 174

For which reaction Kc has NO units?

87 / 174

Which of the following layers contains ozone gas?

88 / 174

Which compound has two halogen atoms on adjacent carbon atoms?

89 / 174

Formic acid contains functional group:

90 / 174

Which of the following is NOT a water-borne disease?

91 / 174

Sulphur Trioxide is prepared according to the following reaction:
2SO_{ 2(g) }+O_{ 2(g) }\rightleftharpoons 2S{ O }_{ 3(g) }
The condition of this reaction is:

92 / 174

n-pentane: iso-pentane and neo pentane are having different:

93 / 174

Which compound is not a saturated hydrocarbon?

94 / 174

Which one is not an air pollutant?

95 / 174

Which of the following cannot be classified as Arrhenius acid?

96 / 174

The unit of Kc for a reaction with equal number of moles of reactants & products is:

97 / 174

Which of the following Salts causes temporary hardness in water?

98 / 174

Kwashiorkor is a disease caused by an extreme lack of:

99 / 174

At equilibrium state of a reversible reaction:

100 / 174

Green colour in firework is produced by the use of: (Example 10.4 P-35)

101 / 174

Which of the following is evolved during the ripening of fruits and vegetables?

102 / 174

The pH of Lemon juice is ‘2’. The { H }^{ + } ion concentration { H }^{ + } in the lemon juice is:

103 / 174

Which is used for dehydrohalogenation of Alkyl halides?

104 / 174

___________ is used to make rectified spirit by fermentation process

105 / 174

The reduction of alkyl halides takes place in the presence of:

106 / 174

What is the percentage of Nitrogen in Ammonium sulphate { (NH }_{ 4 })_{ 2 }{ SO }_{ 4 }?

107 / 174

Chalcopyrite is the ore of:

108 / 174

What is the unit of equilibrium constant for N_{ 2(g) }+O_{ 2(g) }rightleftharpoons 2N{ O }_{ (g) }?

109 / 174

Formic acid contains functional group:

110 / 174

Colour of methyl red in solution of pH=9 is:

111 / 174

Which is reddish brown gas?

112 / 174

The separation of mineral from gangue is called concentration. Which of the following methods is used for concentration?

113 / 174

Which of the following is a Lewis acid?

114 / 174

Which of the following is the chemical formula of Gypsum?

115 / 174

The gastric juice has pH= 1 It means a ___________________ solution.

116 / 174

Which process produces an Alkane?

117 / 174

The atmospheric layer that has the temperature range of −5 °C to −93°C is:

118 / 174

Stem "But" stands for how many carbon atoms?

119 / 174

Halite is an ore of:

120 / 174

Which of the following does not happen, when a system is at equilibrium state?

121 / 174

In which of the following hydrocarbons, oxygen is attached to two alkyl groups?

122 / 174

Which one of the followings is insoluble in water?

123 / 174

In an irreversible reaction equilibrium is:

124 / 174

If an alkane is having '5’ carbon atoms then the number of Hydrogen atoms in this alkane will be:

125 / 174

Which of the following is a Lewis base?

126 / 174

Hydrogen is added to Propene according to the following equation:
C{ H }_{ 3 }CH={ CH }_{ 2 }+{ H }_{ 2 }x\rightarrow { 200-300^{ O }C } { CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 3 }
Which of the following catalysts is used for this reaction?

127 / 174

The density of water is maximum at:

128 / 174

In the following reaction which species is donating an electron pair?
{ NH }_{ 3 }+{ BF }_{ 3 }rightarrow { H }_{ 3 }N-{ BF }_{ 3 }

129 / 174

Which product is obtained when chloromethane is reduced?

130 / 174

Which of the following causes brain damage in children?

131 / 174

Which of the following is an aldehyde?

132 / 174

Phenol gives _______ ppt with bromine water.

133 / 174

Raffinose ({ C }_{ 18 }{ H }_{ 32 }{ O }_{ 16 }) is a:

134 / 174

Fehling’s solution is used to determine the presence of:

135 / 174

Complete the following reaction:
CH\equiv CH+{ H }_{ 2 }\xrightarrow [ Ni ]{ 200-300^{ O }C } _____________

136 / 174

In the given reaction which species is donating an electron pair?
{ NH }_{ 3 }+{ BF }_{ 3 }\rightarrow { H }_{ 3 }N-{ BF }_{ 3 }

137 / 174

__________ is used for artificial ripening of fruits.

138 / 174

The disease caused due to the deficiency of Vitamin D is:

139 / 174

The general formula for Amines is:

140 / 174

Which of the following is used for dehydrohalogenation of alkyl halides?

141 / 174

Which of the following reaction will not have any units for 𝐾𝑐?

142 / 174

Glucose is:

143 / 174

The substance which fight against diseases in living organisms are:

144 / 174

Raffinose produces ______ units of simple sugars when hydrolyzed.

145 / 174

What are the units of Kc for
{ N }_{ 2(g) }+{ O }_{ 2(g) }\rightleftharpoons 2{ N }_{ 2(g) } ?

146 / 174

What is the colour of methyl red in basic solution?

147 / 174

On boiling temporary hard water, the substance which is settled down is:

148 / 174

Which of the following is responsible for acid rain?

149 / 174

Which human activity results in contamination of water bodies?

150 / 174

Which of the following is not a water borne disease?

151 / 174

Disorders of Red blood cells is caused due to the deficiency of:

152 / 174

A drain cleaner solution contains 1.0 × { 10 }^{ -8 }M, { OH }^{ - } concentration. This solution is:

153 / 174

The general formula of alkynes is:

154 / 174

Which of the following is a water soluble vitamin?

155 / 174

__________ is used to manufacture urea fertilizer.

156 / 174

Which of the following is used as Antacid?

157 / 174

What happens when ammonium carbamate is distilled with steam?

158 / 174

Which is used for dehydro-halogenation?

159 / 174

What is the unit of equilibrium constant for
{ N }_{ 2 }+{ O }_{ 2 }\rightleftharpoons 2N{ O }_{ 2 }

160 / 174

Galena is the ore of _________ metal.

161 / 174

Which of the following is used as jet fuel?

162 / 174

What per cent of alkaline aqueous solution of KMnO_{ 4 } is used to detect the presence of an Alkene?

163 / 174

Identify molecule produced when electrical discharges pass through oxygen in air:

164 / 174

Formic acid contains _______ functional group.

165 / 174

Which process produces an alkane?

166 / 174

What is the chemical formula of slaked lime?

167 / 174

By dehydration, we mean the removal of:

168 / 174

The formula of Halite is:

169 / 174

The word vitamin was first used by:

170 / 174

Percentage of nitrogen in urea is:

171 / 174

What is the colour of phenolphthalein in acidic medium?

172 / 174

The general formula of alkane is:

173 / 174

_________ is used to make liquid soap and shaving cream.

174 / 174

Raffinose ({ C }_{ 18 }{ H }_{ 32 }{ O }_{ 16 }) on hydrolysis forms ______ simple sugars.

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