Which of the following is an example of a chemical change?
A. dissolution of salt in water B. rusting of iron C. melting of ice D. separating a mixture by distillation Correct Answer: Option B – rusting of iron
What is the PH of 0.00 1 moldm³ solution of the sodium hydroxide?
A. 14 B. 13 C. 12 D. 11 Correct Answer: Option D – 11
The Sulphide which is insoluble in dilute hydrochloric acid is?
A. FeS B. CuS C. ZnS D. Na2S Correct Answer: Option B – CuS Explanation Sulphides like PbS (lead (II) sulphide) and CuS (copper (II) sulphide) are insoluble in acidified solutions.
A substance that is used as a ripening agent for fruits is?
A. ethene B. propane C. methane D. butane Correct Answer: Option A – etheneProducts
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