chemistry MCQs – Page 53

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 Review each marked answer and report any item that may be outdated or unclear.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

1041. Oxygen does not react with all except_________________?
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A. Metals

B. Acid

C. Alkali

D. Water

1042. Colour in transition metal compounds is attributed to____________?
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A. Small sized metal ions

B. Absorption of light in UV region

C. Incomplete (n-1) d sub-shell

D. Complete ns sub-shell

1043. SO2 reacts with Cl in sunlight to form__________?
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A. Suphanyl chloride

B. Sulphuryl chloride

C. All of the above

D. Sulphur dioxide

1044. Alpha particles can be detected by using___________?
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A. Barium sulphate

B. Zinc sulphide screen

C. Thin Aluminium sheet

D. Gold foils

1045. A process used for the Concentration of Ore is________?
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A. Electrolysis

B. Distillation

C. Forth flotation

D. Roasting

1046. Which is used for artificial ripening of fruit ?
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A. ethene

B. ethyne

C. methane

D. ethane

1047. The Branch of chemistry dealing with brewing and distilling is called _______ ?
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A. Zygology

B. Zymology

C. Zootaxy

D. Zymurgy

1048. The PH of the 1.3 10-4 NH4Cl is__________?
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A. 1.3

B. 3.886

C. 4

D. 2.886

1049. What is the Chemical formula of Zinc Hydroxide _________ ?
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A. ZNO2

B. Zn2(OH)3

C. Zn(OH)2

D. ZnOH

1050. The formula of starch is__________________?
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A. (C6H10O5)n

B. C12H22O11

C. C6H12O6

D. C6H10O5

1051. Which set of quantum numbers is not allowed?
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A. n=2,l=0,m1=0,ms=-1/2

B. n=2,l=2,m1=1,ms=-1/2

C. n=2,l=1,m1=-1,ms=+1/2

D. n=2,l=1,m1=0,ms=+1/2

1052. Which of the following haloalkane is hydrolysed by SN1 mechanism?
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A. CH3CH2CH2Br

B. (CH3)3CBr

C. CH3CH2Br

D. CH3Br

1053. If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is _________?
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A. 2 R

B. R/4

C. 3R/4

D. R/2

1054. The most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds would be__________?
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A. Distillation

B. Gas chromatography

C. Extraction

D. Column chromatography

1055. Consider the following reaction- 3Cl2 + 6NaOH ? NaClO3 + 5NaCl + 3H2O This reaction is_______________?
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A. Double displacement reaction

B. Displacement reaction

C. Reduction reaction

D. Disproportionation reaction

1056. When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed ?
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A. 2 moles of ethane

B. 1 mole of butane

C. 1 mole of ethane

D. 2 moles of butane

1057. Poisonous gas present in the exhaust fumes of a jet plane is__________?
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A. Flurocarbon

B. Carbon monoxide

C. C2H2

D. Methane

1058. The metallurgical process in which a metal is obtained in a fused state is called__________?
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A. calcinations

B. smelting

C. froth floatation

D. roasting

1059. For which mechanisms the first step involved is the same ?
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A. E2 + SN2

B. SN1 and SN2

C. E1 + E2

D. E1 and SN1

1060. For a given mass of a gas at constant temperature, if the value V becomes 3 times, the pressure will becomes__________?
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A. 6P

B. 3P

C. 3P/T

D. P/3

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