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Chemistry

Chemistry
The lightest gas which is non-inflammable is

Oxygen
Nitrogen
Hydrogen
Helium

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Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O2
O-22
O+2
O-2

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Chemistry
What is the atomic number of Oxygen

8
5
22
12

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Chemistry
Which one of the following elements exhibits the greatest tendency to lose electrons ?

Fluorine
Zinc
Oxygen
Lithium

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Chemistry
Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium

A, B, C, D and E
B, D and E
A, C and E
A and C

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Chemistry
Commercially, sodium bicarbonate is known as

Washing soda
Baking soda
Soda ash
Bleaching powder

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