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Chemistry

Chemistry
In a period from Li to F, ionisation potential

Increases
Remains same
Cannot be predicted
Decreases

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Chemistry
The greenhouse effect is caused by the higher level of which gas in the atmosphere ?

Carbon monoxide
Nitrous oxide
Sulphur dioxide
Carbon dioxide

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Chemistry
Vulcanized rubber contains sulphur

3-5%
0.02
10-15%
7-9%

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Chemistry
The gas that causes suffocation and death when coal or coke is burnt in a closed room is

Carbon di-oxide
Carbon monoxide
Methane
Ethane

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > Na+ > O2- > F-
Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-
N3- > O2- > F- > Na+

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Chemistry
Solder metal is an alloy of

Copper and zinc
Copper and tin
Lead and tin
Lead and antimony

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