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UPSC CAPF AC Paper - I
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Heating of an ore below its melting point in the absence of air is known as:

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Important Questions on Chemistry

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UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 144
When water itself combines chemically with some element or mineral it is called:
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 145

Consider the following substances.

I. Heavy water

II. Graphite

Which of the substances given above is/are used as a moderator in a nuclear reactor?

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UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 146
Why hard water does not give lather with soap?
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 147

Statement I: Oxyhydrogen flame produces higher temperature than oxy atomic hydrogen flame.

Statement II: The heat generated during burning of these gases in oxygen is used to melt substances.

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UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 148
Deuterium is a non-radioactive isotope of hydrogen. It resembles hydrogen in chemical properties but reacts:
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 149

Statement I: Water is a high boiling point liquid.

Statement II: Hydrogen bonding in water is responsible for high boiling point of water.

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UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 150
Hard water causes serious problems in the industrial equipments. Hardness of the water is caused by which of the following elements?
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 151

Statement I: Hard water does not give lather with soap.

Statement II: Calcium and magnesium salts present in hard water form precipitate with soap.