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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Magnesium
Iron
Silicon

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Chemistry
An element of atomic no. 29 belongs to

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

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Chemistry
Which gas is most stable at room temperature

H2
F2
N2
O2

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Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

13 days
3 billion years
0.01 minute
100 years

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Chemistry
Of the following, which one pollutes the air of a big city ?

Copper
Cadmium
Chromium
Lead

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Mercury oxide and neon
Sodium oxide and argon
Sodium vapour and neon
Mercury vapour and argon

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MORE MCQ ON Chemistry

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