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Subject: Chemistry, asked on 1/8/15

give examples of following types of solutions
a) liquid in water b) non aqueous solution c) solid in non aqueous solvent

Subject: Chemistry, asked on 1/8/15

give reason for following assertions .
a) ammonia is a compound
b) air is a mixture , not a compound
c) tap water is a mixture , not a compound

Subject: Chemistry, asked on 31/7/15

Explain the procedure of separation of
1)nitrogen and hydrogen chlorite
2)chlorine and carbon mono oxide
3)carbon dioxide and oxygen
4)ammonia and hydrogen

Subject: Chemistry, asked on 29/7/15

which one of the following substances is an element , which is a mixture & which is a compound . give 1 reason in each case .
a) chlorine b) milk c) honey d) sea water e) gun powder f) brine or salt g) sulphur h) apple juice i) syrup j) carbon dioxide k) bronze

Subject: Chemistry, asked on 4/7/15

how to separate pure water from seawater

Subject: Chemistry, asked on 4/7/15

name the chemical technique which could be used to separate :
1.iodine crystals from sand
2.petroluem from crude oil

Subject: Chemistry, asked on 4/7/15

how is the dye left behind the watch glass
 

Subject: Chemistry, asked on 4/7/15

how can wood be a compound
 

Subject: Chemistry, asked on 28/6/15

HOW CAN WOOD BE A COMPOUND

Subject: Chemistry, asked on 28/5/15

What is Bose-Einstein condensate?

Subject: Chemistry, asked on 28/5/15

What is plasma state?

Subject: Chemistry, asked on 26/5/15

how to obtain oxyger from a mixture of oxygen and ammonia and hydrogen from a mixture of hydrogen and CO.

Subject: Chemistry, asked on 26/5/15

name the technique used to separate hydrated copper 2 sulphate or blue vitriol from its aqueous solution
name the technique used to separate unused zinc after reacting excess zinc with dilute sulphuric acid. and pure copper from a sample of impure copper.

Subject: Chemistry, asked on 26/5/15

a pupil decides to separate powdered calcium carbonate from powdered calcium chloride by shaking the mixture with water and filtering. would this procedure succeed. explain.

Subject: Chemistry, asked on 26/5/15

how to separate a precipate of lead sulphate obtained by adding sulphuric acid to a solution of lead nitrate.
how to obtain powdered charcoal from a mixture of copper oxide and powdered charcoal. ( react with dilute acid)

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