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CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 6 - MCQExams.com

In a gaseous reaction of the type, aA+bBcC+dD, which is wrong?
  • a litres of A combines with b litres of B to give C and D
  • a mol of A combines with b mol of B to give C and D
  • a g of A combines with b g of B to give C and D
  • a molecules of A combines with b molecules of B to give C and D
BaCl2(aq)+Na2SO4(aq)BaSO4(s)+2NaCl(aq)
Above reaction involves which type of reaction :
(a) Displacement
(b) Precipitation
(c) Combination
(d) Double displacement
  • (a) & (c)
  • (a), (b) & (c)
  • (b) & (c)
  • (b) & (d)
Rancidity of fats can be prevented by antioxidants.
  • True
  • False
Precipitate in a reaction is indicated by which arrow mark?
Which of the following process involves chemical reaction?
  • Formation of ice from water
  • Respiration
  • Compression of sponge
  • Cutting of tree
The mixture of carbon and sulphur is separated by using the solution of _________.
  • carbon dioxide
  • carbon disulphide
  • carbon monoxide
  • sulphur oxide
Which of the following is not a characteristic of a chemical reaction?
  • Formation of precipitate
  • Change in color
  • Change in temperature
  • None of the above
Constituents of the compounds can be separated by
  • physical methods
  • chemical reactions
  • Both A and B
  • None of A or B
In the reaction given below, hydrogen is getting:
CuO+H2Cu+H2O
  • reduced
  • oxidized
  • No change
  • None of the above
State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.
  • True
  • False
The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be:
  • Brown, black and green in colour
  • Black, brown and green in colour
  • Brown in colour in all the metals
  • Black in colour in all the metals
On heating the crystals of lead nitrate crystals, brown fumes are emitted.
  • True
  • False
Which of the following are combination reactions?
(i) 2KClO3+Heat2KCl+3O2
(ii) MgO+H2OMg(OH)2
(iii) 4A1+3O22A12O3
(iv) Zn+FeSO4ZnSO4+Fe
  • (i) and (iii)
  • (iii) and (iv)
  • (ii) and (iv)
  • (ii) and (iii)
Reduction reaction is the exact opposite of
  • displacement reaction
  • decomposition reaction
  • oxidation reaction
  • none of these
The reaction BaCl2(aq)+H2SO4(aq)BaSO4(s)+2HCl(aq) is
  • Displacement reaction
  • Neutralisation reaction
  • Decomposition reaction
  • Double displacement reaction
One day Mohan was performing an experiment in the laboratory. By mistake he leaves the iron nail in the copper sulphate solution for one week.

After one week, the colour of sulphate solution is:

1821146_bfdae966148f4e02b26d9f1effec44de.PNG
  • Green 
  • Yellow
  • Red 
  • Colourless
In a combination how many products are formed?
  • two only
  • one or two only
  • one only
  • number cannot be specified
Fatty food become rancid due to the process of 
  • Oxidation
  • Corrosion
  • Reduction
  • Hydrogenation
Calcium oxide reacts vigorously with water to produce slaked lime.

CaO(s)+H2O(l)Ca(OH)2(aq)+Heat

This reaction can be classified which of the following?
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Decomposition reaction
  • (A) and (C)
  • (C) and (D)
  • (A), (C) and (D)
  • (A) and (B)
Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as
  • Displacement and redox
  • Decomposition and redox
  • Displacement and endothermic
  • Decomposition and exothermic
Which one of the following does not result in the evolution of H2gas? 
  • Zinc and hydrochloric Acid
  • Aluminium and Nitric Acid
  • Iron and Sulphuric Acid
  • Magnesium and very dilute nitric acid
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
  • (i) only
  • (ii) only
  • (iv) only
  • (ii) and (iv)
Identify an element combination reaction from the following.
  • 2Pb(NO3)22PbO+4NO2+O2
  • 2Al2O34Al+3O2
  • S+O2SO2
  • 2CO+O22CO2
Lead nitrate on decomposition gives:
  • lead oxide
  • nitrogen dioxide
  • oxygen
  • nitrogen
A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound YWrite the chemical formula of X and Y:
  • xMgO;yMgN
  • x2MgO;yMg2N3
  • xMgO;yMg3N2
  • None of these
Identify the type reaction from the following.
H2CO3(aq)H2O(l)+CO2(g)
  • Combustion reaction
  • Decomposition reaction
  • Displacement reaction
  • Double displacement reaction
When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them?
  • Chemical combination reaction
  • Chemical decomposition reaction
  • Chemical displacement reaction
  • Chemical double decomposition reaction
KMnO4+H2SO4+FeSO4K2SO4+MnSO4+Fe2(SO4)3+H2O

Coefficients of sulphuric acid and ferric sulphate in the balanced equation of above reaction are______and ______respectively.
  • 8, 4
  • 5, 8
  • 4, 3
  • 8, 5
Sodium bicarbonate on decomposition forms:
  • NaHCO3
  • Na2CO3
  • Na2CO3.10H2O
  • None of these
Which of the following pairs will give displacement reactions?
  • NaCl solution and copper metal
  • MgCl2 solution and aluminium metal
  • FeSO4 solution and silver metal
  • AgNO3 solution and copper metal.
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