MCQ Class 7 Science Chapter 5 Physical and Chemical Changes Advertisement MCQ’s For All Chapters – Science Class 7th 1. A change that affects iron articles and slowly destroys them is:CrystallizationRustingGalvanizationChemical changeQuestion 1 of 82. Which of the following is a reversible change?Changing of milk into curdMelting of iceGermination of seedBurning of matchstickQuestion 2 of 83. Rusting of iron is a chemical change because:a new substance is formedit is temporary it can be cleaned and the original substance recoveredBurning of matchstickQuestion 3 of 84. Which is the formula of ozone?O3Fe2O3Fe3O2O2Question 4 of 85. The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is:CuOCu2OCuCuSQuestion 5 of 86. Food items when kept carefully get spoiled is a:physical changechemical changeboth (a) and (b)none of theseQuestion 6 of 87. Burning the magnesium ribbon is a:rustingphysical changechemical changeall of theseQuestion 7 of 88. The chemical name of baking soda is:hydrogen carbonatesodium hydrogen carbonatePotassium carbonatenone of theseQuestion 8 of 8 Loading...
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