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Q) Which chemical is used to remove hardness of water?
Correct Answer - Option
(B)
Explanation:
Washing soda (sodium carbonate) reacts with calcium and magnesium ions to remove hardness from water.
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Q) What is the main ore of iron?
Correct Answer - Option
(B)
Explanation:
Hematite (Fe₂O₃) is the principal ore from which iron is extracted.
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Q) Which process is used to separate alcohol from water?
Correct Answer - Option
(B)
Explanation:
Distillation separates alcohol from water based on the difference in their boiling points.
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Q) What is dry ice?
Correct Answer - Option
(B)
Explanation:
Dry ice is solid carbon dioxide (CO₂) that sublimates directly into gas without becoming liquid.
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Q) What is the chemical formula of ammonia?
Correct Answer - Option
(A)
Explanation:
Ammonia has the chemical formula NH₃, consisting of one nitrogen and three hydrogen atoms.
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Q) Which of the following metals reacts with cold water?
Correct Answer - Option
(B)
Explanation:
Calcium reacts with cold water to produce calcium hydroxide and hydrogen gas.
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Q) Which of the following acids is present in vinegar?
Correct Answer - Option
(B)
Explanation:
Vinegar contains acetic acid, which gives it a sour taste and acts as a preservative.
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Q) What type of bond is formed between two atoms sharing electrons?
Correct Answer - Option
(B)
Explanation:
Covalent bonds are formed when two atoms share one or more pairs of electrons.
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Q) Which of the following elements is essential for respiration?
Correct Answer - Option
(B)
Explanation:
Oxygen is essential for respiration as it helps in the oxidation of glucose to produce energy.
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Q) What is the common name of calcium carbonate?
Correct Answer - Option
(D)
Explanation:
Both limestone and marble are different crystalline forms of calcium carbonate (CaCO₃).
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