A) Choose the appropriate word from the list given below and complete the sentence by filling the blanks:
1) In a refinery, petrol is obtained from crude oil by the process of of...
2) Grass stains are removed from from the clothing by using.... as solvent
3) Common salt it is obtained obtained from sea water water by the process of..
4) When caustic soda solution is added to an aqueous solution of copper sulphate, a blue precipitate of copper hydroxide is obtaine. The copper hydroxide can be separated from the mixture by the process of of....
B) How would you separate or name the process you used to separate:
1) Pure Iodine from a sample impure iodine.
2) Remove grease spots from warm clothes.
3) Pure water from sea water.
4) Iodine from a mixture of iodine and sodium chloride.
5) sulphur from a mixture of Sulphur and carbon.
6) common salt from a solution of of solution of of common salt in water.
7) alcohol from a mixture of mixture of alcohol and water.
8) sulphur from a mixture of carbon particles and powdered roll sulphur.
9) Black copper oxide from a mixture of copper oxide and zinc oxide.
10) the coloured dyes in black ink ink black ink ink in black ink ink.
11) sulphur from a mixture of Sulphur and iron fillings.
12) Separate a precipitate of lead sulphate obtained by adding sulphuric acid to a solution of solution of Lead Nitrate.
13) oil from a mixture of of oil and water.
14) Iodine from a mixture of iodine and ammonium chloride.
15) Powered charcoal from a mixture of copper oxide and powder charcoal?
16) iodine crystal from send.
17) petrol from crude oil.
18) Constituents of colouring matter in ink.
19) hydrated copper(II) sulphate or blue vitriol from its aqueous solution.
20) pure copper from a sample of impure copper.
21) Nitrogen from liquid air.
22) Unused zinc after the reaction of excess zinc with dilute sulphuric acid.
23) copper filings from a mixture of copper filings and iron filings.
24) kerosene oil from mixture of kerosene oil and petrol.
25) gold from a mixture of gold and copper feelings.
26) lead sulphate from a mixture of lead sulphate and lead chloride.
27) lead chloride from a mixture of lead Chloride and silver chloride.
28) zinc carbonate from a mixture of zinc carbonate and sodium carbonate carbonate.
29) oxygen from a mixture of Oxygen and ammonia.
30) Benzene (b.p.80°C)) from toluene(b.p.111°C) with which it is miscible.
D)
1) Name the kind of change of state, when naphthalene changes to gaseous state.
2) Name one element which undergoes similar change as above question.
3) name common substance which exists in all the three states of matter.
4) Name the gas formed in each case, when dilute hydrochloric acid is added to:
a) a mixture of iron and sulphur
b) a compound of iron and sulphur.
5) Name the process used to separate the constituents of the liquefied air.
6) State how will you remove carbon dioxide dioxide from a mixture of carbon dioxide and carbon monoxide.
7) a) You are given some Iron fillings and powdered roll sulphur are well mixed and heated in a test tube describe all what you observe.
b) Name the grey mass which is formed in test tube at the end of reaction.
c) Would you call the above reaction: exothermic or endothermic?
8) Which liquid would you select to remove sulphur from crucible.
9) What is meant by saying that oxygen molecule is diatomic ?
10) Explain: when ammonium chloride is heated in a test tube, a white deposit appears at the top of tube.
11) What is meant by atomicity of a gas ?
12) name a gas which is diatomic.
13) A pupile decides to separate powdered calcium carbonate from powdered calcium chloride by shaking the mixture with water and filtering. Would this procedure succeed ? Explain your answer.
14) Mixtures are are usually heterogeneous, but sometimes homogeneous also. Give one example each of of two different types of homogeneous mixture, e.g., mixture of solid and solid --- alloy or brass.
15) Name a non-metallic element which
a) is a liquid at room temperature
b) is a good conductor of electricity.
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