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Chemistry

Chemistry
What is the atomic number of Oxygen

5
12
8
22

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Chemistry
PH value between 6.5-7.5 makes the soil

None of these
Basic
Acidic
Neutral

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Chemistry
In a Carbonyl group a carbon atom makes double bond with

Carbon
Hydrogen
Oxygen
None of these

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Chemistry
The fiber least prone to catch fire is

Polyester
Cotton
Terylene
Nylon

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Chemistry
Ozone consists of

Hydrogen and Carbon
Oxygen and Carbon
Oxygen and Nitrogen
Oxygen only

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Chemistry
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

From brown to orange-red
From pink to blue-green
From blue to pink
From brown to blue-black

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