721.  Which oxyacid of halogen has maximum acidic nature?

Answer & Explanation
HClO4

722.  Purification of petroleum is carried out by which method?

Answer & Explanation
Fractional distillation

723.  Which petroleum refinery product has the lowest boiling point?

Answer & Explanation
Gasoline

724.  What is the characteristic odour of garlic?

Answer & Explanation
A sulphur compound

725.  Which is purest form of iron?

Answer & Explanation
Wrought iron

726.  Which is used as a coolant in nuclear reactors?

Answer & Explanation
Liquid sodium

727.  What can be the maximum duration of totality for a solar eclipse?

Answer & Explanation
7 minutes 40 seconds

728.  What does M3 include?

Answer & Explanation
M1 + T.D

729.  Which part of cinchona plant yields quinine?

Answer & Explanation
Bark

730.  Which of the following is good nuclear fuel?

Answer & Explanation
Plutonium-239

731.  Liquefied Petroleum Gas consists of mainly which gases?

Answer & Explanation
Methane, butane and propane

732.  Which is the element that has the highest first ionization potential?

Answer & Explanation
Nitrogen

733.  What is the principal reason for the formation of metamorphic rocks?

Answer & Explanation
Extreme     heat                  and pressure

734.  Which transition metal is in liquid state?

Answer & Explanation
Mercury

735.  Which rocks is transformed into marble?

Answer & Explanation
Limestone
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