chemistry MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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
951. Grignard reagent is reactive due to___________________?
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A. the presence of halogen atom

B. the polarity of C-Mg bond

C. all

D. the presence of magnesium atom

952. Which one of the following is the weakest acid in water__________________?
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A. HBr

B. HCI

C. HF

D. HI

953. The oxidation of isopropyl alcohol will yield___________________?
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A. Propanone

B. Propanol

C. Propanoic acid

D. propane

954. When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________?
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A. propanal

B. propanoic acid

C. propanol

D. propane

955. Which is the strongest acid ?
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A. HCIO2

B. HCIO3

C. HCIO

D. HCIO4
956. FeSO4 forms brown ring with________________?
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A. NO

B. N2O3

C. N2O

D. NO2

957. Which of the halogen can displace other three elements ?
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A. Bromine

B. Flourine

C. Iodine

D. Chlorine

958. The O-O linkage is present in__________?
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A. H2S4O6

B. H2S2O3

C. H2SO8

D. H2 S2 O6

959. In a closed vessel, a gas is heated from 300K to 600 K. The kinetic energy becomes__________?
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A. Double

B. Half

C. Four times

D. Same

960. The molecular formula for cholesterol is C27 H46 O. What are the degrees of unsaturation for this compound?
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A. 7

B. 6

C. 5

D. 8

961. Order of ease of halogenation in alkane is________________?
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A. F2>Cl2>Br2>I2

B. Cl2>F2>Br2>I2

C. I2>Cl2>Br2>F2

D. F2>Cl2>I2>Br2

962. Which one of the following halogens is present in Teflon________________?
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A. F2

B. I2

C. Br2

D. Cl2

963. Consider the following reaction- 2KCIO3 + H2C2O4 + H2SO4 ? K2SO4 + 2H2O + 2CO2 + Oxide Which oxide of chlorine is produced in the above reaction ?
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A. Cl2O6

B. ClO2

C. Cl2O7

D. Cl2O

964. The halogen having highest electron affinity is_____________________?
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A. Bromine

B. Fluorine

C. Iodine

D. Chlorine
965. The halogen which reacts very slowly with halogen is________________?
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A. Bromine

B. Chlorine

C. Fluorine

D. Iodine
966. Find the PH of a 0.001 M solution of Nitric acid HNO3?
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A. 2

B. 5

C. 4

D. 3
967. Vander Waals forces are stronger in_______________?
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A. F2

B. Cl2

C. I2

D. Br2

968. In which compound nitrogen has maximum oxidation state____________________?
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A. N2O

B. HNO3

C. NO2

D. HNO2

969. The by-product of the process of Saponification is___________?
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A. Sodium hydroxide

B. Methanol

C. Glycol

D. Glycerol
970. The density of a gas is 1.964 g dm-3 at 273 K and 76 cm Hg. The gas is _________?
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A. CO2

B. C2H4

C. Xe

D. CH4

971. Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?
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A. Zeolites

B. Nitrates

C. Sulphonides

D. Lime

972. Potassium Permanganate is used for purifying drinking water, because_________?
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A. It is an oxidising agent.

B. It dissolves the impurities of water.

C. It is a sterilising agent.

D. It is a reducing agent.

973. Absolute alcohol is obtained when rectified spirit is treated with__________________?
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A. CaO

B. CaCl2

C. CaCO3

D. Ca(OH)2

974. Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone ?
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A. primary alcohol

B. secondary alcohol

C. tertiary alcohol

D. dihydric alcohol

975. When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?
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A. 0.215

B. 0.9

C. 0.115

D. 0.015

976. The carbon-carbon bond strength is maximum in__________?
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A. Cyclohexane

B. CH2=CH2

C. Benzene

D. CH3CH3
977. Removal of CO2 is called_____________________?
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A. hydroxylation

B. esterification

C. carboxylation

D. decarboxylation
978. The given dissociation constant (Ka) value 1.310-10 is of_________________?
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A. Phenol

B. Alcohol

C. Water

D. Acetic acid

979. Azimuthal quantum number defines___________?
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A. e/m ratio of an electron

B. Magnetic momentum of an electron

C. Spin of an electron

D. Angular momentum of an electron
980. Presence of nitrogen in organic compounds is tested as__________?
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A. CN?

B. Nitrogen gas

C. NH3

D. NO

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