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Chemistry

Chemistry
Lead pencil contains

Ferrous sulphide
Lead
Lead sulphide
Graphite

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

x/6
7.2 x
5x
5x/36

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Chemistry
The aqueous solution of potassium chloride is

A strong electrolyte
A non-electrolyte
A weak electrolyte
Initially weak and then become a strong electrolyte

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Chemistry
Which of the following laser types is used in a laser printer?

Gas laser
Semiconductor laser
Excimer laser
Dye laser

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Chemistry
In electro-refining, the pure metal is deposited on

Anode
Vessel
Electrolyte
Cathode

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Chemistry
The basic chemical building block of natural rubber obtained from trees is

Neoprene
Vinyl Chloride
Isoprene
Acetylene

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