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Chemistry

Chemistry
Which of the following metals is not a pollutant ?

Lead
Mercury
Aluminium
Arsenic

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Chemistry
The gas used for artificial ripening of green fruit is

acetylene
ethane
carbon dioxide
ethylene

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Chemistry
The smog is essentially caused by the presence of

O2 and O3
O3 and N2
O2 and N2
Oxides of N and S

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Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Troposphere
Ionosphere
Stratosphere

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Chemistry
The addition of gypsum to portland cement helps in :

Increasing the strength of cement
Preventing rapid setting of cement
Reduction in the cost of cement
Rapid setting of cement

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Chemistry
An electric iron has a heating element made of :

Nichrome
Tungsten
Zinc
Copper

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MORE MCQ ON Chemistry

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