Subject: Chemistry
1. The boiling point of water on Celsius and Kelvin scale respectively is:
a)373, 273 c)0, 273
b)273, 373 d)100, 373
2. Zig-zag movement of the solute particle in a solution is known as
a) Linear motion c) Circular motion
b) Brownian motion d) Curved motion.
3. Name the technique to separate-
a)Iron filings from a mixture of iron filings and sulphur
b) tea leaves from tea
4. A solution contains 50 g of common salt in 300 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.
5. A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near
the top of the filter paper.
(i) What would you expect to see, if the ink contains three different colored components?
(ii) Define the technique used by the child.
(iii) Suggest two more applications of this technique.
ii-Rigidity
b) With reference to the metals and non-metals answer the following
i-Name a lustrous non-metal.
ii-Name a metal which exists as a liquid at room temperature.
7. a) Give reasons for the following observations-
(i) Naphthalene balls disappear with time without leaving any solid.
(ii) We can get the smell of perfume sitting several meters away.
(iii) Ice at 273 K more effective in cooling than water at the same temperature
b) Draw a well labeled diagram depicting the process of separation of oil and water using separating funnel.
8. a) Now-a-days, we get full-cream, toned and double-toned varieties of milk packed in polybags or tetra packs in the market. These varieties of milk contain different amounts of fat. Answer the following on the basis of this information.
(i) How can we separate cream from milk?
(ii) What principle is involved in this process?
(iii) Write two applications of this method.
b) Draw a well labeled diagram to show separation of a mixture of salt and camphor.
6 a) Compare a solid object with a liquid on the basis of following-
i-Intermolecular force of attraction
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