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Chemistry

Chemistry
The number of neutrons present in an element having mass number 226 and atomic number 88 is :

138
50
314
88

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Chemistry
In arc welding, Argon is used because of its

Ability to lower the melting point of the metal
Low reactivity with metal
High flammability
High calorific value

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Chemistry
In drinking water supply, which of the following treatments is not involved

Coagulation
Softening
Sedimentation
Disinfection

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Chemistry
The percentage of Nitrogen in Air is

85.02
78.03
0.94
0.03

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Chemistry
The natural source of hydro-carbon is

Crude oil
Biomass
Coal
Carbohydrates

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Chemistry
The compounds formed when hydrogen combines with p-block elements are called

Ionic hydrides
Molecular hydrides
Polynuclear hydrides
Metallic hydrides

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