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Chemistry

Chemistry
The substance which does not expand on going from liquid state to solid state is

Aluminium
Type metal
Water
Cast-iron

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Chemistry
The new strain of bacteria produced by biotechnology in alcohol industry is

Pseudomonas putida
Bacillus subtilis
Escherichia coli
Saccharomyces cerevisiae

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Chemistry
The length of double bond is _______ than single bond

Of same lenght
Longer
None of these
Shorter

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Chemistry
Petroleum consists of a mixture of

Hydrocarbons
Carbohydrates
Carbonates
Carbides

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Chemistry
Neoprene is a polymer of

Isoprene
Isopentane
Chloroprene
Isobutane

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Chemistry
The smog is essentially caused by the presence of

O2 and N2
O3 and N2
O2 and O3
Oxides of N and S

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