Acids, Bases and Salts — Important Questions
Maharashtra Board · Class 9 · Science
44 important questions from Acids, Bases and Salts for Maharashtra Board Class 9 Science, with answers. Includes multiple choice, multiple correct.
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Important Questions from Acids, Bases and Salts
Which of the following are strong acids?
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HCl, H2SO4, HNO3
HCl, H2SO4, and HNO3 are strong acids as they dissociate almost completely in water. CH3COOH and H2CO3 are weak acids.
Blue litmus paper turns red in acidic solution.
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True
Blue litmus paper turns red in acidic solutions and remains blue in basic solutions. This is a simple test to identify acids.
Which gas is produced when metals react with acids?
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Hydrogen
When metals react with acids, hydrogen gas is produced. For example: Zn + 2HCl → ZnCl2 + H2.
Which of the following are basic in nature?
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Metal oxides, NaOH, Ca(OH)2
Metal oxides, NaOH, and Ca(OH)2 are basic in nature. Non-metal oxides like CO2 are acidic in nature.
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