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Temporary hardness of water is caused by the presence of

AChlorides of calcium and magnesium

BSulfates of calcium and magnesium

CBicarbonates of calcium and magnesium

DCarbonates of sodium and potassium

Answer:

C. Bicarbonates of calcium and magnesium


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A type of surveying in which the shape of the earth is taken into account

Directions: In the question below is given a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follow beyond a reasonable doubt from the information given in the statement.

Statement: The education system in India needs to emphasize areas related to agriculture, technology, and tourism instead of basic and pure sciences.

Conclusions :

I. We have already excelled in these fields.
II. We need another green revolution to feed our burgeoning population and our youth, which makes 50% of our population.

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