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When hydrogen sulphide gas passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed. This is an example of:

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Important Questions on General Concepts of Chemistry

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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 15
Which one is a decomposition reaction?
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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 16
The reactions in which two compounds exchange their radicals to form two new compounds are called:
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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 17

CuO+H2→Cu+H2O

Above reaction is an example of:

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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 18

In the reaction:

PbO+C→Pb+CO

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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 19
Chemical equations are balanced in accordance with the:
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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 20
Which is not a balanced equation?
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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 21
Which of the following statements is true about chemical equation?
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General Science for Competitive Exams>Chapter 15 - General Concepts of Chemistry>EXERCISE>Q 22
A molal solution is one that contains 1 mole of a solute in: