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Chemistry

Chemistry
Which is the purest commercial form of iron ?

Steel
Pig iron
Stainless steel
Wrought iron

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Chemistry
An element of atomic no. 29 belongs to

D-block
S-block
F-block
P-block

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Chemistry
The gas that usually causes explosions in coal mines is

Hydrogen
Carbon monoxide
Air
Methane

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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 ?

Nitrogen
Neon
Hydrogen
Sodium

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.509
0.727
0.305
0.658

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Chemistry
Find the odd one:

Chalk
Limestone
Slaked lime
Marble

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MORE MCQ ON Chemistry

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