chemistry MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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
141. Which one does not exhibit aldol condensation___________________?
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A. Butanone

B. Ethanal

C. Acetone

D. Benzaldehyde
142. Keeping in view the size of atom which is in correct order___________________?
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A. Mg > Sr

B. CI > 1

C. Ba > Mg

D. Lu > Ce

143. Compounds having same molecular formula but differ in structural formula are called __________________?
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A. isomer

B. monomer

C. allotropes

D. polymer

144. Solubility product of AgCl is 2.0 x 10-10 mol2 dm-6. Maximum Concentration of Ag+1 ions in the solution is__________________?
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A. 1.0 x 10-10 mol dm-3

B. 2.0 x 10-10 mol dm-3

C. 1.0 x 10-5 mol dm-3

D. 1.414 x 10-5 mol dm-3
145. Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces have________________?
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A. Low melting points

B. High electrical conductivity

C. Low vapour pressure

D. High boiling points

146. All the transition elements show_________________?
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A. Similar physical properties

B. Similar chemical properties

C. Both A and b

D. None
147. Size of molecule depends upon________________?
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A. Atomicity

B. Shape of molecule

C. Both A and B

D. Difficult to predict

148. Only London dispersion forces are present among the_________________?
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A. Molecules of solid iodine

B. Molecules of hydrogen chloride gas

C. Molecules of water in liquid state

D. Atoms of helium in gaseous state at high temperature

149. In the van der Waals equation (P + n2a / v2) (v nb) = nRT which of the following statement is not true ?
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A. nb correct for the volume occupied by gas molecules.

B. all of the above statements are correct.

C. n2a/v correct for the intermolecular forces.

D. at high densities the equation reduces to the ideal gas law
150. A great variety of the organic compounds is due to its property of carbon_________________?
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A. Exhibit catenation

B. Show isomerism

C. Show tetravalency

D. Can form multiple bonds

151. The volume occupied by 2.8 g of N2 at STP______________________?
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A. 1.12 dm3

B. 2.24 dm3

C. 112 dm3

D. 22.4 dm3

152. Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?
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A. Calcium superphosphate

B. Urea

C. Potassium nitrate

D. Diammonium phosphate

153. A double bond consists of __________________?
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A. Two sigma bonds

B. One sigma and one Pi bonds

C. One sigma and two Pi bonds

D. Two Pi bonds

154. The rectified spirit is________________?
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A. 95% alcohol

B. 100% alcohol

C. 12% alcohol

D. 90% alcohol

155. The compound which is added to leaded gasoline to save engine from lead oxide and lead sulphate deposits is__________________?
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A. Ethylene chloride

B. Ethylene fluoride

C. Ethylene iodide

D. Ethylene bromide
156. Solubility of CaF2 is 2.010-4 gdm-3 then Ksp of CaF2 is_______________?
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A. 3.2 x 10-11

B. 2.0 x 10-8

C. 4.0 x 10-8

D. 4.0 x 10-12

157. Ethy1 chloride on reduction in the presence of Zn/HCI produces___________________?
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A. n. butane

B. Ethanol

C. Ethane

D. Diethy1 ether

158. Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?
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A. aluminium can be recycled

B. aluminium is resistant to corrosion by organic acids.

C. aluminium has very low density

D. aluminium is the most abundant metal in the earth crust

159. Butyl chloride gives possible isomers ?
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A. 5

B. 3

C. 2

D. 4
160. Which specie has unpaired electrons in antibonding molecular orbitals_______________?
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A. B2

B. O2+2

C. O2-2

D. N2-2