Tincture of iodine has antiseptic properties. This solution is made by
dissolving
(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol
A mixture of sulphur and carbon disulphide is
(a) heterogeneous and shows Tyndall effect
(b) homogeneous and shows Tyndall effect
(c) heterogeneous and does not show Tyndall effect
(d) homogeneous and does not show Tyndall effect
Rusting of an article made up of iron is called
(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
Why does the temperature of a substance remain constant during its melting point or boiling point?
Comment on the following statements:
(a) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increase in
humidity.
(c) Sponge though compressible is a solid.
You want to wear your favourite shirt to a party, but the problem is that it
is still wet after a wash. What steps would you take to dry it faster?
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon
clothes respectively. Who do you think would be more comfortable and
why?
You are provided with a mixture of naphthalene and ammonium chloride
by your teacher. Suggest an activity to separate them with well labelled
diagram.
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