The substances that are composed of to or more different elements in fixed proportion by mass are called
Answer: B
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Temporary hardness is due to the presence of
Answer: B
Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.
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An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number
Answer: C
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' Misch metal ' is widely used in manufacture of which of the following
Answer: C
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The discovery of neutron became very late because
Answer: D
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The bleeding of a wound is stopped by the application of ferric chloride because_____
Answer: D
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Atomic number of an element gives
Answer: B
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Which of the following carbon compounds is used as a fire- extinguisher?
Answer: C
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Species containing same number of electrons are called
Answer: C
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Homo nuclear molecules contain ?
Answer: B
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