What is the general formula of alkenes?
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Which of the following solutions is alkaline?
A ‘breath test’ used by traffic police to check drunken driving uses ____?
In a combination reaction there can be ______.
I. two or more than two reactants
II. two or more than two products
III. only one product
Which of the following statements are CORRECT?
I. Oxides of metals are generally basic.
II. Oxides of non-metals are generally acidic.
III. Non-metals are generally electro positive.
An atom can achieve octet by ______.
I. sharing electron
II. gaining electron
III. losing electron
By volume, 21% of air is _______________.
Brass gets discoloured in air because of the presence of which of the following gases in air ?
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