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WorksheetsChemical Reactions And Equations
Total questions: 8
Worksheet time: 4mins
Which of the following is not a physical change?
Boiling of water to give water vapour
Melting of ice toto give water
Dissolution of salt in water
Combustion of Liquefied Petroleum Gas (LPG)
The following reaction is an example of a
4NH3 (g) +5O2 (g) → 4NO (g) +6H2O (g)
1. displacement reaction
2. combination reaction
3.redox reaction
4. neutralisation reaction
1 and 4
2 and 3
1 and 3
3 and 4
Which of the following statements about the given reaction is correct?
3Fe(s) + 4H2O→ Fe3O4 + 4H2
a. Iron metal is getting oxidised.
b. Water is getting reduced.
c. Water is acting as reducing agent.
d. Water is acting as oxidising agent.
A, B and D
A, C and D
B, C and D
C, B, A
Which of the following are exothermic processes?
1. Reaction of water with quick time
2. Dilution of an acid
3. Evaporation of water
4. Sublimation of camphor (crystals)
1 and 2
2 and 3
1 and 4
3 and 4
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of Na0H, anhydrous CuSO2 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement (s) is (are) correct?
1. In beakers A and B, exothermic process has occurred.
2. In breakers A and B, endothermic process has occurred.
3. In breaker C, exothermic process has occurred.
4. In beaker C, endothermic process has occurred.
Only 1
Only 2
1 and 4
2 and 3
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
KMnO4 is an oxidising agent, it oxidises FeSO4
FeSO4 acts as an oxidizing agent and oxidizes KMnO4
The color disappears due to dilution; no reaction is involved
KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colorless
compound.
Which among the following are double displacement reactions?
(i) Pb + CuCl2 PbCl2+Cu
(ii) Na2SO4+BaCl2 BaSO4+2NaCl
(iii) C+O2 CO2
(iv) CH4+2O2 CO2+2H2O
(i) and (iv)
Only (ii)
(i) and (ii)
(iii) and (iv)
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime water. Which among the following is/are true about slaking of lime water and the solution formed?
(i) It is an endothermic reaction.
(ii) It is exothermic reaction.
(iii) The pH of the resulting solution will be more than seven.
(iv)The pH of the resulting solution will be less than seven.
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
