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Chemistry

Chemistry
The fiber least prone to catch fire is

Nylon
Cotton
Terylene
Polyester

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Chemistry
Which is the purest form of iron?

Pig iron
Cast iron
Steel
Wrought iron

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Chemistry
The mineral containing both magnesium and calcium is

magnesite
calcite
dolomite
carnallite

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Chemistry
Chemical formula of washing soda is

Ca(OH)2
NaHCO3
Na2CO3.10H2O
Na2SO4.10H2O

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

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Chemistry
The most pure form of Carbon among the options is

Lampblack
Anthracite
Wood Charcoal
Graphite

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