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Chemistry

Chemistry
Two moles of an ideal gas expand freely into vacuum. The work done by the gas is

Infinity
2J
4J

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Chemistry
The two metal ions that cause hardness to water are:

Calcium, Magnesium
Sodium, Magnesium
Sodium, Potassium
Sodium, Calcium

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Chemistry
The aqueous solution of potassium chloride is

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

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Chemistry
Which of the following elements is obtained from sea weeds ?

Vanadium
Iodine
Argon
Sulphur

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Chemistry
Number of neutrons in an atom of hydrogen is

Three
Two
Zero
One

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Chemistry
'Fire-fighting clothes' are made from

Talc
Asbestos
Mica
Steatite

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