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WorksheetsChemical Reactions and Equations
Total questions: 26
Worksheet time: 13mins
The chemical formula of lead sulphate is
Pb2SO4
Pb(SO4)2
PbSO4
Pb2(SO4)3
The formula of lead nitrate is
Pb2(NO3)2
Pb(NO2)2
Pb(NO3)2
Pb(NO4)2
Which of the following is formed when lead nitrate is put under thermal decomposition?
Lead oxide
Nitrogen dioxide
Oxygen gas
All of the above
Which information is not conveyed by a balanced chemical equation?
Whether a particular reaction is actually feasible or not
Number of atoms/molecules of the reactants and products formed
Symbols and formulae of all the substances involved in a particular reaction
Physical states of reactants and products
What happens when silver chloride is put under sunlight?
Silver metal and chlorine gas are formed
Silver metal and hydrogen gas are formed
Only silver metal is formed
Only hydrogen gas is formed
Chemically rust is
hydrated ferrous oxide
only ferric oxide
hydrated ferric oxide
none of these
Which of the following product is formed after heating of limestone?
Calcium oxide
Calcium carbonate
Hydrogen gas
All of the above
Both CO2 and H2 gases are
soluble in water
acidic in nature
colorless
heavier than air
In which of the following category will you put the reaction of heating of calcium carbonate?
Decomposition reaction
Thermal decomposition reaction
Endothermic reaction
All of the above
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
Nitrogen or oxygen
Helium or oxygen
Nitrogen or helium
Carbon dioxide or oxygen
In which of the following category will you put the reaction of heating of ferrous sulphate?
Decomposition reaction
Combination Reaction
Displacement reaction
All of the above
The electrolytic decomposition of water gives H2 and O2 in the ratio of
1 : 2 by mass
8 : 1 by mass
2 : 1 by volume
1 : 2 by volume
An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are
X = Al, Y = Al2O3
X = Cu, Y = CuO
X = Ag, Y = Ag2S
X = Fe, Y = Fe2O3
In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is
4
3
2
1
Fatty foods become rancid due to the process of
oxidation
hydrogenation
reduction
corrosion
On immersing an iron nail in CuSO4 solution for few minutes, you will observe
the color of solution fades away
no reaction takes place
the color of solution changes to green
the surface of iron nails acquires a black coating
We store silver chloride in a dark colored bottle because it
is a white solid
undergoes redox reaction
sensitive to sunlight
none of the above
The reaction in which two compounds exchange their ions to form two new compounds is called
displacement reaction
combination reaction
double displacement reaction
redox reaction
Silver articles turn black when kept in the open for a few days due to formation of
H2S
AgS
AgSO4
Ag2S
The reaction of H2 gas with oxygen gas to form water is an example of
combination reaction
redox reaction
exothermic reaction
all of these reactions
When crystals of lead nitrate are heated strongly in a dry test tube
a yellow residue is left
white fumes appear in the tube
a brown residue is left
crystals immediately melt
Rancidity can be prevented by
adding antioxidants
storing food away from light
keeping food in refrigerator
all of these
Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
Odor of a pungent smelling gas is recorded
The reaction mixture turns milky
The surface of metal becomes shining
A colorless and odorless gas is evolved
In which of the following, heat energy will be evolved?
Electrolysis of water
Burning of L.P.G.
Dissolution of NH4Cl in water
Decomposition of AgBr in the presence of sunlight
When carbon dioxide is passed through lime water,
color of lime water disappears
calcium hydroxide is formed
white precipitate of CaO is formed
lime water turns milky
When a magnesium ribbon is burnt in air, the ash formed is
pink
white
yellow
black
