1. Which of the following represent both physical and chemical change.
I. Burning of candle
II. Burning of methane
III. Decomposition of salt Codes
(a) l and l
(b) Il and Ill
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(c) l and Il
(d) Only I
Following questions consist of two statements, I and II. Examine these Two statements and select the correct
choice according to the codes given below.
(a) Both the statements are true and Statement II is the correct explanation of Statement I.
(b) Both the statements are true but
Statement ll is not the correct explanation of Statement I.
(c) Statement I is true, but Statement II is false.
(d) Statement I is false, but Statement II Iist true.
2. Statement I Sublimation NH4Cl is a chemical change.
Statement II Sublimation is a Phenomenon in which a solid on heating directly changes into gas without changing to liquid.
3. Statement I Emission of light from stars is a chemical change.
Statement lI Source of light from stars is nuclear fission reactions.
4. Statement I Making of soda water by dissolving carbondioxide in water is a
chemical change.
Statement II A change in which chemical composition remains same is called physical change.
5. Which of the following processes related to physical change?
I. Salt dissolved in water.
II. Dissociation of salt in water
III. Decomposition of salt by electrolysis
Codes
(a) I and ll
(b) Il and Ill
(c) I and III
(d) All of these
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