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90184281. Which of the following is used to iodize common salt?
A
Potassium iodideB
IodineC
Potassium iodateD
Sodium iodideCorrect Answer: C. Potassium iodate
90085282. Seaweeds are an important source of
A
ironB
chlorineC
bromineD
iodineCorrect Answer: D. iodine
90005283. Aluminium can be purified by
A
oxidationB
distillationC
electrolysisD
ozonolysisCorrect Answer: C. electrolysis
90167284. Which gas is used as a fire extinguisher ?
A
Carbon dioxideB
Carbon monoxideC
Carbon suboxideD
Sulphur dioxideCorrect Answer: A. Carbon dioxide
90126285. The metallic constituents of hard water are
A
Magnesium, calcium and tinB
Iron, tin and calciumC
Calcium, magnesium and ironD
Magnesium, tin and ironCorrect Answer: C. Calcium, magnesium and iron
90136286. The polymerisation of which of the following is used in the manufacturing of polythene in the industry?
A
MethaneB
StyreneC
AcetyleneD
EthyleneCorrect Answer: D. Ethylene
90150287. Vinegar made by fermentation from cane sugar contains
A
palmitic acidB
lactic acidC
citric acidD
acetic acidCorrect Answer: D. acetic acid
90075288. Ozone consists of
A
Oxygen onlyB
Oxygen and NitrogenC
Hydrogen and CarbonD
Oxygen and CarbonCorrect Answer: A. Oxygen only
90010289. An atomic pile is used for
A
producing X-raysB
conducting nuclear fissionC
conducting thermonuclear fusionD
accelerating atomsCorrect Answer: B. conducting nuclear fission
90183290. Which of the following is used to denature ethanol?
A
Methyl alcoholB
Propyl alcoholC
PhenolD
MethaneCorrect Answer: A. Methyl alcohol
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