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6 . Potassium Permanganate is used for purifying drinking water, because
A. it is a sterilising agent
B. it dissolves the impurities of water
C. it is a reducing agent
D.
it is an oxidising agent

7 . Which of the following is an element?
A. Ruby
B. Sapphire
C.
Emerald
D. Diamond

8 . Which of the following is not an isotope of hydrogen?
A. Tritium B. Deuterium
C. Protium D. Yttrium

9 . Which crop is sown on the largest area in India?
A. Rice B.  Wheat
C. Sugarcane D. Maize

10 . Which one of the following gases is supporter of combustion?
A. Hydrogen B. Nitrogen
C. Carbon dioxide D. Oxygen




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