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661. Detergents used for cleaning clothes and utensils contain

A. nitrates

B. bicarbonates

C. sulphonates

D. bismuthates

Explanation:

662. Which of the following is a universal blood donor ?

A. A

B. B

C. AB

D. O

Explanation:

663. Which of the following terms is used for several individuals of a species living together in a locality ?

A. Biosphere

B. Ecosystem

C. Bio-community

D. Population

Explanation:

664. The largest gland in the human body is

A. heart

B. liver

C. kidney

D. brain

Explanation:

665. Potassium permanganate is used for purifying drinking water, because

A. it dissolves the impurities of water.

B. it is a sterilising agent.

C. it is an oxidising agent.

D. it is a reducing agent.

Explanation:

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