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Chemistry

Chemistry
The percentage of carbon in cost iron is :

3 to 5
0.01 to 0.25
6 to 8
0.5 to 1.5

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Chemistry
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

1 : 1 : 1
2 : 16 : 1
2 : 16 : 2
1 : 16 : 2

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Chemistry
Wax used for making candle is chemically a mixture of

Aromatic hydrocarbons
Aliphatic hydrocarbons
Cyclic hydrocarbons
Aliphatic and aromatic hydrocarbons

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Chemistry
Epsom salt is used

As purgative
In paper industry
In softening water
In making tooth paste

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Chemistry
Which among the following is found in chlorophyll ?

Fe2+
Ca2+
A l3+
Mg2+

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Chemistry
Which one of the following group of gases contributes to the 'Green House Effect'?

Ammonia and Ozone
Carbon dioxide and Methane
Carbon monoxide and Sulphur dioxide
Carbon tetraflouride and Nitrous oxide

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