Chemical Reactions And Equations Class 10 Chemistry Assignment Pdf
Class 10 Chemistry students should refer to the following printable assignment in Pdf for Chemical Reactions And Equations in standard 10. This test paper with questions and answers for Grade 10 Chemistry will be very useful for exams and help you to score good marks
Class 10 Chemistry Assignment for Chemical Reactions And Equations
Question. The reaction between aqueous solutions of sodium chloride and silver nitrate is -
a. displacement reaction
b. synthesis reaction
c. double displacement reaction
d. analysis reaction
Answer. C
Question. CH4 + Cl2 → CH3 Cl + HCl reaction is an example of -
a. Synthetic
b. Analytical
c. Displacement
d. Neutralisation
Answer. C
Question. A Brown and bright element “x” when heated in presence of air turns into black substance “y”. If Hydrogen gas is passed over this heating material again “x” is obtained. “x” and “y” are –
a. Cu & CuO
b. S & SO2
c. C & CO2
d. Na & NaH
Answer. A
Question. H2S(g) + Cl2 (g) → 2 HCl(g) + S(s), The reaction is interpreted as :
a. H2S is getting oxidised and Cl2 is getting reduced
b. H2S is getting reduced and Cl2 is getting oxidised
c. Only H2S is oxidised
d. Both H2S and Cl2 are reduced
Answer. A
Question. What is the oxidation number of sulphur in peroxy mono sulphuric acid (H2SO5) ?
a. 8
b. 6
c. 5
d. 4
Answer. D
Question. Oxidation is defined as :
a. loss of electron
b. gain of electron
c. loss of proton
d. gain of proton
Answer. A
Question. From the following metals whose nitrate produces NO2 gas on heating
a. Na
b. K
c. Pb
d. None of these
Answer. C
Question. The equation given below indicates; NaCl + AgNO3 → AgCl + NaNO3 :
a. Chemical decomposition
b. Chemical combination
c. Chemical displacement
d. Chemical double displacement
Answer. D
Question. From the given reactions which is a redox reaction ?
a. CuO(s) + H2O(g) → Cu(s) + H2O(l)
b. 2Cu(s) + O2(g) → 2CuO(s)
c. C(s) + 2H2(g) → CH4(g)
d. 4Al(s) + 3O2(g) → 2Al2O3(s)
Answer. C
Question. Displacement reaction is :
a. CaO (s) + H2O(l) → Ca(OH)2 (aq)
b. Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)
c. MnO2(s) + 4HCl(l) → MnCl2\(s) + 2H2O(l) + Cl2(g)
d. C6H12O6 + 6O2 → 6CO2 + 6H2O
Answer. B
Question. Identify the type of reaction for each of the following as
Combination –(p)
Decomposition –(q)
Displacement –(r)
Double displacement –(s) or combustion – (t)
(i) A compound break apart into its elements
(ii) A metal and a non metal react to form an ionic compound.
(iii) A compound of hydrogen and carbon reacts with oxygen to produce carbon-dioxide and water.
(iv) Silver ion from Ag(NO3) (aq.) forms a precipitate with bromide ion from KBr aq.
a. (i)-(q), (ii)-(p), (iii)-(r), (iv)-(s)
b. (i)-(q), (ii)-(p), (iii)-(t), (iv)-(s)
c. (i)-(s), (ii)-(r), (iii)-(q), (iv)-(p)
d. (i)-(p), (ii)-(t), (iii)-(q), (iv)-(r)
Answer. B
Question. Which of the following is endothermic reaction ?
a. C(s) + O2(g) → CO2(g)
b. N2(g) + O2(g) → 2NO(g)
c. 2H2(g) + O2(g) → 2H2O(l)
d. 2CH3OH (l) + 3O2(g) → 2CO2(g)+4H2O(l)
Answer. B
Question. In which of the following reactions H2O2 acts as a reducing agent :
a. H2O2 + 2H+ + 2e– → 2H2O
b. H2O2 – 2e– → O2 + 2H+
c. H2O2 + 2e– → 2OH–
d. H2O2 + 2OH– – 2e– → O2 + 2H2O
a. a.,c.
b. b.,d.
c. a.,b.
d. c., d.
Answer. C
Question. Precipitate formation during chemical reaction is indicated by this arrow :
a. ↑
b. →
c. ↓
d. ←
Answer. B
Question. The chemical reaction HNO3 + KOH → KNO3 + H2O is an example of
a. neutralization
b. double displacement
c. neutralization and double displacement
d. combination
Answer. B
Question. In the reaction SO2 (g) + 2H2S(g) → 3S + 2H2O(g) the reducing agent is
a. SO2
b. H2O
c. H2S
d. S
Answer. C
Question. Which of the following is reduction reaction ?
a. Bleaching of coloured objects using moist chlorine
b. Rancidity of fats
c. Thermite process involving the reaction of chromium oxide (or) iron oxide with alumini
d. The poling process involving the removal of impurities from a molten metals
Answer. C
Question. Hydrolysis of water is which type of following reactions?
a. Endothermic
b. Decomposition
c. Both 1 and 2
d. Combination
Answer. C
Question. When a burning splinter is brought near the gas jar containing hydrogen gas a popping sound is observed. It is due to
a. exothermic
b. endothermic
c. exothermic and endothermic
d. none of these
Answer. A
Question. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
a. calcium
b. carbon
c. silicon
d. iron
Answer. A
Question. Identify the correct oxidant and reductant in the following reaction :
PbS + 4H2O2 → PbSO4 + 4H2O
a. PbS – Oxidant
H2O2 – Reductant
b. PbS – Reductant
PbSO4 – Oxidant
c. PbS – Reductant
H2O2 – Oxidant
d. H2O2 – Oxidant
H2O – Reductant
Answer. C
Question. Sodium carbonate is kept open in the air it looses crystalline water. The process is called:
a. Hygroscopy
b. Deliquescent
c. Efflorescence
d. None of the above
Answer. C
Question. Which out of the following solutions will give a white precipitate when common salt solution is added to it :
a. KNO3 solution
b. AgNO3 solution
c. Ba(NO3)2 solution
d. Mg(NO3)2 solution
Answer. B
Question. Match the given column-I with column-II and choose the correct option :
I II
a. 2Mg + O2→ 2MgO i. Exothermic reaction
b. CaO+H2O→Ca(OH)2 ii. Dissociation
c. 2 AgCl → 2Ag +Cl2 iii. Reduction
d. CuO +H2 → Cu+H2O iv. Oxidation
a. a-i, b-ii, c-iii, d-iv
b. a-ii, b-i, c-iv, d-iii
c. a-iv, b-iii, c-i, d-ii
d. a-iv, b-i, c-ii, d-iii
Answer. D
Question. When KMnO4 acts as an oxidising agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is :
a. 4, 3, 1, 5
b. 1, 5, 3, 7
c. 1, 3, 4, 5
d. 3, 5, 7, 1
Answer. C
Question. Which of the following is a redox reaction ?
a. NaCl + KNO3 → NaNO3 + KCl
b. CaC2O4 + 2 HCl → CaCl2 + H2C2O4
c. Mg (OH)2 + 2 NH4Cl → MgCl2 + 2 NH4OH
d. Zn + 2 AgCN → 2 Ag + Zn (CN)2
Answer. D
Question. The oxidation state of Cr in [Cr(NH3)4Cl2]+ is :
a. + 3
b. + 2
c. + 1
d. 0
Answer. A
Question. Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?
a. 2HI + H2SO4 → I2 + SO2 + 2H2O
b. Ca(OH)2 + H2SO4 → CaSO4 + 2H2O
c. NaCl + H2SO4 → NaHSO4 + HCl
d. 2PCl5 + H2SO4 → 2POCl3 + 2HCl + SO2Cl2
Answer. A
Question. In which of the following reactions H2O2 acts as a reducing agent ?
a. H2O2 + 2H+ + 2e¯ → 2H2O
b. H2O2 – 2e¯ → O2 + 2H+
c. H2O2 + 2e¯ → 2OH¯
d. H2O2 + 2OH¯ – 2e¯ → O2 + 2H2O
a. a., b.
b. c., d.
c. a., c.
d. b., d.
Answer. D
Question. In balancing the reaction.
xH2S + 2NaNO3 + 2HCl → y S + zNO + kNaCl + 4H2O
one would get x,y, z and k, respectively, as
a. 3,3,2 and 2
b. 2,2,3 and 3
c. 3,3,4 and 4
d. 4,4,3 and 3
Answer. A
1 MARKS QUESTIONS:
1) What is meant by a chemical reaction ?
2) On what basis is a chemical equation balanced?
3) Write a balanced chemical equation for the reaction between sodium chloride and silver nitrate indicating the physical state of the reactant and the products.
4) What are the various in which a chemical equation can be made more informative.
5) Identify the type of reaction in the following examples.
a) Na2SO4 + BaCl2→ BaSO4 + 2NaCl.
b) N2+ 3H2→ 2NH3
c) 2Pb (NO3)2 →2PbO +4 NO2 + O2
d) Zn + 2 Ag NO3→Zn (NO3)2 + 2Ag
2 MARKS QUESTIONS:
6) Using balanced chemical equation explain the difference between a displacement reaction and double displacement reaction.
7) Define the following terms with examples.
a) Oxidation
b) Reduction
c) Corrosion
d) Redox Reaction
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