Chemical Properties — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Chemical Properties MCQs with step-by-step solutions (10 questions). Part of Acids, Bases & Salts. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Chemical Properties · medium · theory
When a dilute acid reacts with an active metal, the gas evolved is:
A. hydrogen ✓ Correct
B. nitrogen
C. oxygen
D. carbon dioxide
Solution: Acid + metal → salt + hydrogen gas.
Q2 — Chemical Properties · hard · theory
The gas evolved when an acid reacts with a metal carbonate (e.g. limestone) is:
A. carbon dioxide ✓ Correct
B. oxygen
C. chlorine
D. hydrogen
Solution: Acid + carbonate → salt + water + carbon dioxide, which turns lime water milky.
Q3 — Chemical Properties · medium · theory
The reaction of an acid with a base to form salt and water is called:
A. displacement
B. oxidation
C. neutralisation ✓ Correct
D. sublimation
Solution: Acid + base → salt + water is a neutralisation reaction.
Q4 — Chemical Properties · hard · theory
The gas produced when a metal reacts with an acid is tested by bringing a burning splint near it; a positive test gives:
A. a milky colour
B. a "pop" sound ✓ Correct
C. a red colour
D. a green flame
Solution: Hydrogen gas burns with a characteristic "pop" sound.
Q5 — Chemical Properties · hard · theory
Acids conduct electricity in aqueous solution because they:
A. are metals
B. produce no ions
C. produce ions (H⁺) in water ✓ Correct
D. contain oxygen only
Solution: Acids ionise in water to give mobile ions (including H⁺), which carry the current.
Q6 — Chemical Properties · medium · theory
Which gas turns lime water milky?
A. Oxygen
B. Hydrogen
C. Ammonia
D. Carbon dioxide ✓ Correct
Solution: Carbon dioxide reacts with lime water to form calcium carbonate, turning it milky.
Q7 — Chemical Properties · easy · theory
When a dilute acid reacts with an active metal such as zinc, a gas is released that burns with a pop sound. This gas is:
A. Carbon dioxide
B. Oxygen
C. Chlorine
D. Hydrogen ✓ Correct
Solution: Metals react with dilute acids to form a salt and hydrogen gas; hydrogen is the gas that burns with a characteristic pop sound.
Q8 — Chemical Properties · medium · theory
A dilute acid is added to sodium carbonate and a colourless gas is produced that turns limewater milky. Which gas is being released?
A. Hydrogen
B. Carbon dioxide ✓ Correct
C. Sulphur dioxide
D. Oxygen
Solution: Acids react with carbonates to give a salt, water and carbon dioxide. Carbon dioxide is the gas that turns limewater milky.
Q9 — Chemical Properties · hard · theory
Assertion: Dry hydrogen chloride gas does not turn dry blue litmus paper red, but its water solution does. Reason: An acid shows acidic behaviour only when it is dissolved in water, where it can produce hydrogen (H+) ions. Which is correct?
A. Both are true, but the reason does not explain the assertion
B. The assertion is false but the reason is true
C. The assertion is true but the reason is false
D. Both assertion and reason are true, and the reason correctly explains the assertion ✓ Correct
Solution: Acids need water to release H+ ions, which are responsible for acidic behaviour. Dry HCl gas has no free H+ ions, so it cannot change dry litmus; the reason correctly explains the assertion.
Q10 — Chemical Properties · hard · theory
A certain element M reacts with dilute hydrochloric acid to release hydrogen gas, and the oxide of M reacts with the same acid to give only a salt and water. From this information, the correct conclusion is that M is:
A. A non-metal whose oxide is acidic
B. A non-metal whose oxide is neutral
C. A metal whose oxide is acidic
D. A metal whose oxide is basic ✓ Correct
Solution: Only metals displace hydrogen from acids, and a basic (metal) oxide reacts with acid to give just salt and water. Both clues show M is a metal with a basic oxide.