chemistry MCQs – Page 43

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 Review each marked answer and report any item that may be outdated or unclear.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
841. The metal which is used in thermite process because of its activity is____________________?
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A. aluminium

B. zinc

C. copper

D. iron

842. Which of the following sulphates is not soluble in water ?
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A. Potassium sulphate

B. Sodium sulphate

C. Zinc sulphate

D. Barium sulphate
843. CO2 is gas while SiO2 is solid at room temperature?
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A. CO2 forms multiple bond while silicon does not form multiple bonds

B. Silicon has all sigma bonds

C. carbon is non-metal while silicon is semi-metal

D. CO2 is an independent molecule while SiO2 has network covalent structure
844. The preparation of benzene from acetylene can also be said as_________________?
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A. Condensation

B. Dehydration

C. Polymerization

D. Oxidation

845. Cannizaros reaction takes place through the transfer of ____________________ from complex anion?
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A. oxide ion

B. hydride ion

C. methoxide ion

D. hydrogen ion

846. When COOH is attached directly to the benzene ring the acid is called__________________?
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A. Alicyclic

B. Carboxylic

C. Aromatic

D. Aliphatic

847. True increasing order of acidity of the oxides of Mn is_________________?
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A. MnO2 > Mn2O7 > MnO

B. Mn2O7 > MnO2 > MnO

C. MnO2 > MnO > Mn2O7

D. MnO < MnO2 < Mn2O7

848. What catalyst is employed when benzene is prepared from acetylene at 70C?
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A. Raney nickel

B. Organo-nickel

C. Ni 250 300C

D. Cr2O3 + A2O3 + SiO2

849. Nitration of chlorobenzene gives___________________?
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A. A & B

B. m chloronitrobenzene

C. o chloronitrobenzene

D. p chloronitrobenzene

850. Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide ?
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A. methanoic acid

B. carbonic acid

C. acetic acid

D. ethanol

851. Which of the following aldehydes shows rapid reaction with sodium nitroprusside ?
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A. acetone

B. accetaldehyde

C. formaldehyde

D. benzaldehyde

852. Which of the following will give phosphoric acid one reaction with water_________________?
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A. P2O5

B. PCI5

C. P2O3

D. All of the above
853. Which one of the following substances conducts electricity by the movement of ions ?
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A. Graphite

B. Molten sodium chloride

C. Copper

D. Mercury

854. Which discovery caused a revision in the periodic law as stated by Mendeleev ?
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A. Location of nucleus by Rutherford

B. Natural radioactivity by Henry Bacquerel.

C. X-rays by Roentgen

D. Atomic number by Moseley
855. Which of the following do not give aldol condensation reactions ?
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A. propionaldehyde

B. diemthyl ketone

C. formaldehyde

D. acetaldehyde

856. Which one of the following gives white precipitate with aqueous solution of BaCl2?
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A. Na2CO3

B. Na2CrO4

C. NaNO3

D. NaHCO3

857. Which of the following will not form crystalline structure with opporitely charged ions_________________?
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A. Mg2+

B. Ca2+

C. H+

D. H-

858. Essential amino acids are___________________?
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A. 15

B. 10

C. 5

D. 20

859. NaOH is named as caustic soda because________________?
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A. It corrodes the organic tissues

B. It reacts with fats to form soap

C. It reacts with chlorine gas

D. It is used in soda water

860. Which of the following always increases on going from top to bottom in a group ?
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A. Tendency to get reduced

B. Oxidizing power

C. Metallic character

D. Electronegativity