Chemistry Objective questions
for ICSE -2014
A.
State one observation in each of the following-
1.
Excess of ammonium hydroxide is added to copper
sulphate solution.
2.
Silver nitrate solution is added to HCl
3.
Conc. Sulphuric acid is added to Copper
sulphate crystals.
4.
Moist red litmus is brought near the mouth of
test tube containing ammonia gas.
5.
Moist blue litmus paper is brought near the mouth of test tube containing HCl
gas.
6.
Nitric oxide gas is passed though freshly
prepared ferrous sulphate solution.
7.
Solution of Barium chloride and Solver nitrate
are added.
8.
Ethyne is bubbled through Bromine dissolved in
Carbon tetra chloride.
9.
Zinc is added to dil sulphuric acid.
10.
Zinc granules are added to conc. Nitric acid.
11.
Zinc Carbonate is heated in a test tube and the
test tube is left to cool.
12.
Sodium carbonate solution is added to solution
of CaCl2
13.
Oxygen and nitric oxide are mixed and the
product is shaken with distilled water.
14.
Water is added to the product obtained by
burning magnesium is air and the gas thus produced is brought in contact with
HCl gas.
15.
H2S gas is passed through Bromine
water.
16.
Copper nitrate crystals are heated.
17.
Aluminium carbide is reacted with water and the
gas thus produced is burnt in deficient air supply.
18.
Acetylene is bubbled through ammonical cuprous
chloride solution.
19.
Ammonium hydroxide solution is added to lead
nitrate solution first slowly and then in excess.
20.
Ammonium sulphate is heated with caustic soda
and the gas thus produces is bubbled through methyl orange solution.
21.
Copper is heated with conc. Nitric acid and the
the gas thus produced is passed into KI solution.
22.
Iron (II) sulphide is heated with dil sulphuric
acid and the gas thus evolved is passed through lead acetate solution.
23.
Trilead tetraoxide is heated with cocn HCl.
24.
Conc. Nitric acid is added to methanol.
25.
Dil. Sulphuric acid is added to lead nitrate
solution.
26.
Ammonia gas is passed through a solution obtained
by reactic copper (II) oxide and dilute sulphuric acid.
27.
Solutions of sodium chloride and sodium
hydroxide are mixed.
28.
Barium nitrate is added to potassium carbonate
solution.
29.
Sodium nitrate, copper and cocn. Sulphuric acid
are added.
30.
Con. Sulphuric acid is added to ethanol and the
gas thus evolved is passed through bromine dissolved in carbon tetra chloride.
B.
Give reasons why-
1.
Copper can conduct electricity but S cannot.
2.
Hydrogen chloride gas fumes in air.
3.
Bottles containing NaOH are not covered using glass
stoppers.
4.
Hydrochloric acid is used for pickling of
metals before galvanizing.
5.
Hydrogen chloride gas is never collected over
water
6.
Addition of con sulphuric acid to zinc
liberates sulphur dioxide gas but dilute acid liberate hydrogen.
7.
Aluminium oxide is not reduced by reducing
agents.
8.
In the laboratory ammonia is collected by
downward displacement of air.
9.
In haber’s process for manufacturing of ammonia
external heating is not required once the process starts.
10.
In contact process, the gases passing through
the oxidation chamber should be free from arsenic impurities.
11.
In laboratory preparation of methane NAOH is
always used with CaO.
12.
In laboratory preparation of HCl the
temperature is always kept below 200oC
13.
In laboratory preparation of nitric acid the
temperature is always kept below 200oC.
14.
In preparation of sulfuric acid through contact
process SO3 gas is never added directly to water.
15.
Con. HCl is never used for preparation of HNO3.
16.
For dilution of sulphuric acid, acid is always
added to water with constant stirring.
17.
Dry SO2 can’t bleach a rose petal.
18.
For electroplating the article to be
electroplated is always made cathode.
19.
For electroplating of Ag, silver nitrate is
never used.
20.
Nitric acid is always stored in dark bottles.
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