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Chemistry

Chemistry
Which one of the following is not coal variety?

Lignite
Peat
Dolomite
Bituminous

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Chemistry
Which one of the following statements is not correct? Vulcanisation of rubber makes it

Soft and flexible
Withstand higher temperatures
Strong and hard
Chemical resistant

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Chemistry
The purest form of Iron is :

Steel
Pig iron
Wrought iron
Cast iron

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Chemistry
Which of the following is used to remove rust stains on cloth?

Petrol
Oxalic acid solution
Kerosene
Lime

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Chemistry
The percentage of carbon in cost iron is :

3 to 5
6 to 8
0.01 to 0.25
0.5 to 1.5

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Chemistry
A balloon filled with helium rises in air because

Helium is less dense than air
Helium pushes down on the air below the balloon
The balloon is weightless
Air exerts an upward force on the balloon

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