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Chemistry

Chemistry
A subshell with l=2 can take up

10 electron
3 electron
5 electron
8 electron

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Chemistry
Baryllium Sulphate is less soluble in water due to

Low inflammable energy
Lonic band
Low Energy of dissociation
High inflammable energy

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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
0.01 minute
100 years
3 billion years

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Chemistry
Main pollutants released from iron and steel industry are

NO, SO3 and H2S
CO2, H2S and NO2
CO, CO2 and SO2
CO2, NO2 and SO3

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Chemistry
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is

36
19
17
53

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Chemistry
The metallic constituents of hard water are :

Magnesium, tin and iron
Magnesium, calcium and tin
Calcium, magnesium and iron
Iron, tin and calcium

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