Q. Which of the following is known as laughing gas?
(a) Chlorofluorocarbon (b) Ammonia
(c.) Nitrous Oxide (d) Carbon Monoxide
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Q. Which of the following elements is not a Noble gas?
(a) Radon (b) Krypton
(c) Argon (d.) Actinium
Q. Which among the following is a constituent of natural silk?
(a) Phosphorus (b.) Nitrogen
(c) Magnesium (d) Potassium
Q. The Xylem in plants is responsible for transporting
(a) Oxygen (b) Amino Acid
(c.) Water (d) Food
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