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446. Marsh gas is
A. hydrogen
B. nitrogen
C. methane
D. ethane
Explanation:
447. The metallic constituents of hard water are
A. magnesium, calcium and tin
B. iron, tin and calcium
C. calcium, magnesium, tin and iron
D. magnesium, tin and iron
Explanation:
448. Iodised salt contains
A. free iodine
B. calcium iodide
C. magnesium iodide
D. potassium iodate
Explanation:
449. Which scale of temperature is generally used for domestic purposes in Russia ?
A. Celsius scale
B. Fahrenheit scale
C. Reaumer scale
D. Absolute scale
Explanation:
450. Turpentine oil is obtained from
A. eucalyptus tree
B. animal fat
C. mineral oil
D. pine tree
Explanation:
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