Chemistry · Exercise 1 of 3

Chemistry Chemistry - Section 1

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Subject: General Knowledge
Topic: Chemistry
Exercise: Chemistry - Section 1
Questions: 79

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Question 1

The gas used in the manufacture of vanaspati from vegetable oil is

A hydrogen

B oxygen

C nitrogen

D carbon dioxide

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Question 2

The ionic radii of N^3-, O^2-, F^- and Na⁺ follows the order

A N^3- > O^2- > F^- > Na⁺

B N^3- > Na⁺ > O^2- > F^-

C Na⁺ > O^2- > N^3- > F^-

D O^2- > F^- > Na⁺ > N^3-

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Question 3

The graphite rods in the nuclear reactor

A react with U to release energy

B produce neutrons

C undergo combustion which triggers the nuclear fission

D convert fast moving neutrons into thermal neutrons

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Question 4

The first metal used by man was

A iron

B copper

C gold

D bronze

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Question 5

The hydronium ion is

A H⁺

B HO^-

C H²⁺

D H₃O⁺

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Question 6

The most electropositive elements among the following is

A Na

B Ca

C K

D Cs

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Question 7

The high reactivity of fluorine is due to

A its high electro negativity

B small size of fluorine atom

C availability of d-orbitals

D strong F - F bond

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Question 8

The iron ore magnetite consists of

A Fe₂O₃

B Fe₃OH₄

C FeCO₃

D 3Fe₂O₃ .. 3H₂O

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Question 9

The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2^nd orbit to 3^rd orbit is

A 5x/36

B 5x

C 7.2 x

D x/6

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Question 10

The major constituent of air is

A nitrogen

B carbon dioxide

C oxygen

D hydrogen

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