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Chemistry

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

17
19
53
36

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Chemistry
Cement is made hard with

Polymerisation
Dissociation of water
Dehydration
Hydration and dissociation of water

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Chemistry
The total energy of revolving electron in an atom

Can have any value above zero
Cannot be negative
Will always be positive
Can never be positive

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Chemistry
When ice cubes are made, the entropy of water

May either increase or decrease depending on the process used
Increases
Does not change
Decreases

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Chemistry
Find the odd one:

Chalk
Marble
Limestone
Slaked lime

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Chemistry
The percentage of nitrogen present in ammonium sulphate is :

0.305
0.27
0.18
0.25

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