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Chemistry

Chemistry
Total number of halogen elements found in the periodic table is

5
3
13
8

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Chemistry
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

6.023 x 1019
1.568 x 103
4.84 x 1017
6.023 x 1023

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Chemistry
The constituents of automobile exhaust that can cause cancer is/are :

Oxides of nitrogen
Lead
Carbon monoxide
Polycyclic hydrocarbons

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Chemistry
CNG used in automobiles to check pollution, mainly consists of

H2
CH4
CO2
N2

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Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

CO
CO2
Unburnt petrol
SO2

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Chemistry
The major constituent of air is

nitrogen
carbon dioxide
hydrogen
oxygen

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MORE MCQ ON Chemistry

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