chemistry MCQs – Page 7

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
121. The volume occupied by 1.4g CO at S.T.P is___________________?
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A. 22.4 dm3

B. 1.12 dm3

C. 2.24 dm3

D. 1.12 cm3

122. The number of moles of CO2 which contains 16 g of oxygen is__________________?
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A. 0.75

B. 1

C. 0.25

D. 0.5
123. Which is carnalite________________?
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A. KCI MgCl2 6H2O

B. KCI

C. Na2CO3. 10H2O

D. NaCI

124. Methyl alcohol is not used as___________________?
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A. for denaturing of ethyl alcohol

B. an anti freezing agent

C. a substitute for petrol

D. a solvent

125. The use of antifreeze in the automobile radiator is an important application of__________________?
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A. additive property

B. colligative property

C. constitutive property

D. intrinsic property

126. In 1 pentene -4- yne the carbon exhibit hybridization_________________?
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A. sp2 sp

B. sp3 sp2

C. sp2 sp

D. sp3 sp2 sp
127. Vinyl acetylene combines with hydrochloric acid produces___________________?
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A. Chloroprene

B. Ethylidine dichloride

C. Diviny1 acetylene

D. 1 3 3 trichloro butane

128. Mostly elements have fractional atomic masses because of______________________?
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A. Atmoic masses are average masses of isotopes

B. Atomic masses are average masses of isobars

C. Atmoic masses are average masses of isotopes proportional to their relative abundance

D. Mass of an atom itself is in fraction

129. Geometric isomerism is usually found in___________________?
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A. Alkanes

B. Esters

C. Alkenes

D. Alkynes

130. Molecular ions are formed by passing______________________?
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A. X-rays

B. ? particle

C. All of the above

D. High energy electron beam

131. Mass spectrometer is used to determine Mass number of isotopes and___________________?
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A. Relative abundance

B. All of the above

C. Atomic number

D. Electronic configuration

132. How many isotopes have odd atomic number ?
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A. 86

B. 300

C. 280

D. 154

133. Avogadros number may represent_________________?
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A. All of the above

B. mass of particles

C. number of particles

D. volume of particles

134. For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as___________________?
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A. qp = qv

B. qp > qv

C. qp < qv

D. qp = qv / 2

135. The most paramagnetic element is____________________?
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A. Cobalt

B. Iron

C. Manganese

D. Chromium

136. One mole of CO2 contains?
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A. 6.022 x 1023 atoms of oxygen

B. 22-gram electrons

C. 6.022 x 1023 atms of carbon

D. both B. & C.
137. Sodium carbonate is produced by____________?
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A. Amonia solvay process

B. lead chamber process

C. haber process

D. decons process

138. Isotopes differs in______________________?
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A. chemical properties

B. position in the periodic table

C. arrangement of electrons in orbitals

D. properties depend upon mass

139. Which of the following ion formation is always exothermic ?
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A. Uni-positive

B. Di-positive

C. Uni-negative

D. Di-negative

140. The molecules of CO2 in dry ice form__________________?
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A. Covalent crystal

B. Molecular crystal

C. Any type of crystal

D. Ionic crystal