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WorksheetsChemical Reactions & Equations
Total questions: 25
Worksheet time: 16mins
Magnesium ribbon is rubbed before burning because it has a coating of
basic magnesium carbonate
basic magnesium oxide
basic magnesium sulphide
basic magnesium chloride
Calcium oxide reacts vigorously with water to produced slaked lime
CaO + H2O ---> Ca(OH)2
Combination reaction
Exothermic reaction
Endothermic reaction
Combination & Exothermic
Combination & Endothermic
Which of the following displacement reaction?
MgCo3 ---> MgO + CO2
2H2 + 2H2O ---> 2H2O
2Na + 2H2O ---> 2NaOH + H2
2Pb(NO3)2 ---> 2PbO + 4NO2 + O2
When green color ferrous sulphate crystals are heated, the color of crystal changes because
loses water of crystalline
decomposed to ferric oxide
forms SO2
forms SO3
A dil. ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple color of the solution fades and finally disappears. Which of the following is the correct explanation?
KMnO4 is an oxidizing agent, it oxides FeSO4
FeSO4 is an oxidizing agent, it oxides KMnO4
Color disappears due to dilution, no reaction involved
KMnO4 is an unstable compound and decomposes in the presence of FeSO4 to a colorless compund
When SO2 gas passed through saturated solution of H2S, which of the following reaction occurs?
SO2 + 2H2S ---> 2H2O + 3S
SO2 + 2H2S ---> H2O + 3S
SO2 + H2S ---> H2O + S
SO2 + H2O ---> H2 + SO3
A substance X is used in white - washing and is obtained by heating limestone in the absence of air. Identify X
Cao
CaCO3
CaOCl2
Ca(OH)2
MnO2 + 4 HCl ---> MnCl2 + 2H2O + Cl2
Identify the substances oxidized in the above reaction/equation
MnCl2
HCl
H2O
MnO2
Which of the following is the exothermic reaction?
i. Reaction of water with quick lime.
ii. Dilution of an acid
iii. Evaporation of water
iv. Sublimation of camphor
i & iv
ii & iv
i & ii
ii & iii
Which of the following statement about the reaction are correct?
3Fe + 4H2O ---> Fe2O4 + 4H2
i. iron metal getting oxidized
ii. Water is getting oxidized
iii. Water is acting as reducing agent
iv. Water is acting as oxidizing agent
i, ii, iii
iii, iv
i, ii, iv
ii , iv
During an experiment, Monika takes lead nitrite in a test tube and adds potassium iodide. What will she observe in a test tube?
Yellow ppt
Red ppt
Green ppt
Nothing will happen
Given below the balance chemical equation for the thermal decomposition of lead nitrite:
2Pb(NO3)2 ---> 2PbO + 4NO2 + O2
Which of the following information does the coefficients of PbO and NO2 in the equation (2 and 4 respectively) tell us?
The ratio of densities of two substances
The ratio of the mass produced of two substances
The ratio of number of atoms in the two substances
The ratio of the number of moles produced of the two substances
Which of the following is the example of simple displacement?
Electrolysis of water
Burning of methane
Reaction of metal with acid
Reaction of two salt solution to form a ppt
What will happen of calcium oxide added to water?
Formation of carbon di oxide
Formation of oxygen
Formation of calcium hydroxide
formation of quick lime
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black ppt of copper sulphide is obtained and the sulphuric acid is formed. The reaction is an example of
Combination
Displacement
Decomposition
Double - Displacement
During a experiment, Narendra takes a 2g of lead nitrate powder in the boiling tube and hold the boiling tube with a pair of tongs. He then heats it over the flame. After a few seconds, he sees X color fumes coming out of the tube, So what is the color of the fumes?
Pink
Reddish brown
Red
Colourless
Why is silver chloride is kept in dark bottle?
To prevents it from rats
To prevents it from decomposition into silver and chloride
To make it visible
To show it as dangerous chemical
If an iron nail is dipped in a solution of copper sulphate for 20min and the color of the iron nail becomes brownish, what is the color change of the copper sulphate after 20min?
Color of solution becomes green
Color of solution becomes red
Color of solution becomes brighter
Color of solution becomes fade
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
1:1
2:1
4:1
1:2
Which of the following is an endothermic reaction?
i. Dilution of sulphuric acid
ii. Sublimation of dry ice
iii. condensation of water vapors
iv. Evaporation of water
i only
ii only
i, iv
ii, iv
Barium chloride on reacting with ammonium sulphate forms barium sulphate ammonium chloride. Which of the following correctly represents the type of reaction involved?
i. Displacement
ii. Combination
iii. PPt (precipitation)
iv. Double displacement
i, iv
ii, iii
iii, iv
i, ii
A: Calcium carbonate when heated gives calcium oxide and water
R: On heating CaCO3 , decomposition reaction take place
(a)
A: Stannous chloride is a powerful oxidizing agent which oxidises mercuric chloride to mercury.
R: Stannous chloride gives grey ppt with mercuric chloride, but stannous chloride does not do so
(a)
A: To dilute sulphuric acid, acid is added to water and not water to acid.
R: Specific heat of water is quite large
(a)
A: Sodium metal is stored under Kerosene
R: Metallic sodium melts when exposed to air
(a)
