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Chemistry

Chemistry
Periodic table contains how many periods

7
10
6
8

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Fluorescence
Absorption spectra
Raman spectra
Emission spectra

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Chemistry
Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?

Eutrophication
Hardness
Acidity
Alkalinity

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Chemistry
Burning pyrites ore gives out

Nitrogen dioxide gas
Sulphur dioxide gas
Nitric oxide gas
Carbon dioxide gas

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Chemistry
Normal rainwater is slightly acidic due to the presence of

Carbon dioxide
Sulphur dioxide
None of these
Methane

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Chemistry
An emulsion is a colloid of a

Liquid in a gas
Gas in a solid
Liquid in a liquid
Gas in a liquid

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