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Chemistry

Chemistry
Which of the following contains high content of lead?

Coal
Cooking gas
Low octane fuel
High octane fuel

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n-2
n
n2
n3

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Chemistry
Bleaching action of moist sulphur di-oxide is because of its

Basic property
Reducing property
Acidic property
Oxidising property

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Chemistry
When a lead storage battery is discharged,

SO2 is evolved
Sulphuric acid is consumed
Lead sulphate is consumed
Lead is formed

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Chemistry
Copper substances when exposed to air gains a green coating due to the formation of:

CuCO3 Cu(OH)2
Cu(NO3)2
CuO
CuSO4

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Chemistry
Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?

Sodium
Neon
Hydrogen
Nitrogen

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