Sawaal
4
Q:

Which process usually requires water?

A) Physical weathering B) Mass wasting
C) Chemical weathering D) Erosion

Answer:   C) Chemical weathering



Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

Subject: Chemistry
Exam Prep: Bank Exams
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The percentage of nitrogen in the air is about

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Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
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Answer & Explanation Answer: D) Pollutants

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By using which foam the Researchers from Indian Institute of Technology – Bombay have made a low cost piezo resistive vibration sensor?

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Answer & Explanation Answer: B) Only Polyethylene

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Which of the following is NOT a compound?

 

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Answer & Explanation Answer: B) Milk

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