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.Management Sciences
Category: Chemistry Mcqs
The most powerful oxidizing agent among the halogens is__________________?
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A. F2
B. Cl2
C. Br2
D. I2
Residence time of methane in the atmosphere is___________________?
A. 3 – 7 days
B. 2 -3 days
C. 3 – 7 years
D. 2 – 3 years
The halogen which reacts spontaneously with gold (Au) to form Au+3 is ________________?
A. F2
B. Cl2
C. Br2
D. I2
The use of CaCl2 and PCl5 in the process of crystallization is as a____________________?
A. oxidizing agent
B. reducing agent
C. drying agent
D. colouring agent
Which element was not known when Mendeleev proposed his classification ?
A. Hydrogen
B. Sodium
C. Copper
D. Germanium
Carboxylic acid on reduction with HI / phosphorous yields_________________?
A. alkane
B. alcohols
C. aldehydes
D. ketones
In crystallization if the solvent is inflammable then direct heating is________________?
A. needed
B. avoided
C. depends on temperature
D. crystallization does not involve heating
The irritation caused by red ants bite is due to____________________?
A. Lactic acid
B. Formic acid
C. Uric acid
D. Acetic acid
Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter?
A. PdCl2
B. Cu2Cl2
C. CuCl2
D. PbCl2
Which of the following technique is simple and efficient to purify a substance____________________?
A. Filtration
B. Sublimation
C. Crystallization
D. Solvent extraction
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