chemistry MCQs – Page 50

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 Review each marked answer and report any item that may be outdated or unclear.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
981. Ce58 is a member of__________?
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A. d-block

B. S-block

C. P-block

D. f-block
982. Argon gas was discovered by_______?
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A. Ramsay

B. Dalton

C. Lockerey

D. Rayleigh

983. Which compound is also known by the name of carbolic acid ?
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A. H3PO3

B. C2H2OH

C. C6H5OH

D. H2CO3

984. Which one of the following is also known as lactic acid ?
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A. 3-Hydroxy propanoic acid

B. 2-hydroxy butanoic acid

C. 3-hydroxy butanoic acid

D. 2-Hydroxy propanoic acid
985. Phenol was isolated by Runge from________________?
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A. wood

B. none of these

C. coaltar

D. vegetable oil

986. In unsaturated hydrocarbons electrons favour___________________?
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A. less reactivity

B. substitution reactions

C. none

D. addition reactions
987. Which one of the following is the correct sequence according to atomic weights?
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A. Ni> Co> Fe

B. Fe>Co> Ni

C. Co >Fe>Ni

D. Co > Ni > Fe
988. R-Mg-Br is called___________________?
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A. Grignard reagent

B. Metallic alkyl halide

C. Both A & B

D. Alkyl

989. Which of the following noble gases is not present in atmosphere?
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A. Xenon

B. Helium

C. Radon

D. Argon

990. Vinylacetylene combines with HCI to form___________________?
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A. polyacetylene

B. divinyl acetylene

C. benzene

D. chloroprene
991. Incomplete oxidation of methane in the limited supply of air forms ?
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A. CO2 and H2O

B. CO + H2 + C

C. CH3OH

D. CO + H2O + C

992. Hydrocarbon is formed when Grignard reagent is treated with___________?
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A. H2O

B. CH3OH

C. Both a and b

D. None of the above

993. The main buffer system of the human blood is____________?
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A. CH<sub>3</sub>COOH CH<sub>3</sub>COO<sup></sup>

B. NH<sub>2</sub>CONH<sub>2</sub> NH<sub>2</sub>CONH<sup>+</sup>

C. H2CO3 HCO3

D. H<sub>2</sub>CO<sub>3</sub> CO<sub>3</sub><sup>2-</sup>

994. Which of the following effects best explains that o-nitrophenol is insoluble in water?
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A. Inductive effect

B. Isomeric effect

C. Resonance effect

D. Intermolecular H-bonding
995. Which Oxide of Manganese is amphoteric?
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A. MnO2

B. Mn2O3

C. Mn2O7

D. MnO

996. Treating phenol with formaldehyde in the presence of dilute base forms Bakelite. The process involved is_________________?
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A. condensation polymerization

B. oxidation

C. additional polymertization

D. elimination

997. Which one of the following is a bridge element?
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A. P

B. Be

C. Cl

D. K

998. In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms__________________?
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A. four

B. three

C. one

D. two

999. Bleaching powder is not used for bleaching________________?
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A. Linen

B. Paper pulb

C. Cotton

D. Costly fabrics
1000. SN2 reaction can be best carried out with__________________?
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A. all

B. tertiary alkyl halide

C. primary alkyl halide

D. secondary alkyl halide