Olympiad Test: Physical And Chemical Changes - 2
10 Questions MCQ Test | Olympiad Test: Physical And Chemical Changes - 2
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When a used shaving blade is dropped into a blue-coloured copper sulphate solution, a brown colour deposit forms on _____, and the solution turns green due to the formation of ________.
C) Iron, ferrous sulphate
When a shaving blade is placed in a copper sulphate solution, the colour changes from blue to green due to the formation of iron sulphate, a new substance. Copper, another new substance, is the brown deposit on the iron nail.
The reaction can be written as:
Copper sulphate solution (blue) + Iron → Iron sulphate solution (green) + Copper (brown deposit)
How can you obtain the substance Z?
Z is either water or salt, both of which can be obtained from the reaction between acid and a salt. Since X is a base and Y is an acid, Z can be obtained from the reaction between X and Y.
Which of the following could be the substance Z
How will the substance X behave with phenolphthalein?
Which of the following are not paired correctly?
The chemical name of slaked lime is calcium hydroxide and calcium oxide is the chemical name of quick lime.
Glowing of an electric bulb is a _____ change.
Since, no new substances are formed in this change, it is a physical change.
The process of separating a pure substance in the form of crystals from the hot saturated solution by cooling is called
Change of limewater in presence of CO2 is
The crystals that are obtained after crystallization are
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