Class 10 Chemical equations and reaction MCQ (Multiple Choice Questions)
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Question 1. Which of the following reactions involves the combination of two elements :-
(a)CaO + CO2 -> CaCO3
(b)4Na + O2 -> 2Na2O
(c)SO2 +(1/2)O2 -> SO3
(d)NH3 + HCI -> NH4CI
Question 2. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphate is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of :-
(a)A combination reaction
(b)A displacement reaction
(c)A decomposition reaction
(d)A double decomposition reaction
Question 3. What happens when copper rod is dipped in iron sulphate solution :-
(a)Copper displaces iron
(b)Blue color of copper sulphate solution is obtained
(c)No reaction takes place
(d)Reaction is exothermic
Question 4. A student added dilute HCI to a test tube containing zinc granules and made following observations :-
(a)The zinc surface became dull and black
(b)A gas evolved which burnt with a pop sound
(c)The solution remained colorless
(d)The solution becomes green in color.
Question 5. A dilute solution of sodium carbonate was added to two test tubes one containing dilute HCI (A) and the other containing dilute NaOH (B). the correct observation was :-
(a)A brown colored gas liberated in test tube A
(b)A brown colored gas liberated in test tube B
(c)A colorless gas liberated in test tube A
(d)A colorless gas liberated in test tube B
Question 6. A balanced chemical equation is in accordance with
(a)Avogadro’s law
(b)Law of multiple proportion
(c)Law of conservation of mass
(d)Law of gaseous volumes
Question 7. The equation
Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O
The values of x and y are
(a)3 and 5
(b)8 and 6
(c)4 and 2
(d)7 and 1
Question 9. The reaction in which two compounds exchange their ions to form two new compounds is
(a)A displacement reaction
(b)A decomposition reaction
(c)An isomerization reaction
(d)A double displacement reaction
Question 10. When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction is
SO2 + 2H2S -> 2H2O + 3S. here hydrogen sulphide is acting as
(a)An oxidizing agent
(b)A reducing agent
(c)A dehydrating agent
(d)A catalyst
Question 11. CuO + H2 ->H2O + Cu, reaction is an example of
(a)Redox reaction
(b)Synthesis reaction
(c)Neutralization
(d)Analysis reaction
Question 12. A substance which oxidized itself and reduces other is known as
(a)Oxidizing agent
(b)Reducing agent
(c)Both of these
(d)None of these
Question 13. A redox reaction is one in which
(a)Both the substance are reduced
(b)Both the substance are oxidized
(c)An acid is neutralized by the base
(d)One substance is oxidized while the other is reduced
Question 14. In the following equation:
Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is
(a)1
(b)2
(c)3
(d)4
Question 15. In the equation, NaOH + HNO3 -> NaNO3 + H2O nitric acid is acting as
(a)An oxidizing agent
(b)An acid
(c)A nitrating agent
(d)A dehydrating agent
Question 16. Fe2O3+ 2AI2O3 + 2Fe
The above reaction is an example of a
(a)Combination reaction
(b)Double displacement reaction
(c)Decomposition reaction
(d)Displacement reaction
Question 17. White silver chloride in sunlight turns to
(a)Grey
(b)Yellow
(c)Remain white
(d)Red
Question 18. Black and white photography uses
(a)Decomposition of silver chloride
(b)Decomposition of silver bromide
(c)Both
(d)None of these
Question 19. When copper powder is heated it gets coated with
(a)Black copper oxide
(b)Yellow copper oxide
(c)Red copper oxide
(d)None of these
Question 20. Combination of phosphorus and oxygen is an example of
(a)Oxidation
(b)Reduction
(c)Rancidity
(d)None of these
Question 21. Rusting of an iron is an example of
a)Reduction
b)Ionization
c)Oxidation
d)Dissociation
Question 22. Which of the following does not corrode when exposed to the atmosphere-
(a)Iron
(b)Copper
(c)Gold
(d)Silver Question 23. Take about 1.0g CaCO3 in a test tube. Heat it over a flame, when a colorless gas comes out. The reaction is called a
(a)Decomposition reaction
(b)Displacement reaction
(c)Double decomposition reaction
(d)Double displacement reaction Question 24. Hydrogen sulphide (H2S) is a strong reducing agent. Which of the following reactions shows its reducing action
(a)Cd(NO3)2 + H2S -> CdS + 2HNO3
(b)CuSO4 + H2S -> CuS + H2SO4
(c)2FeCl3 + H2S -> 2FeCl2 + 2HCI + S
(d)Pb(NO3)2 +H2S -> PbS + 2CH3COOH Question 25. When P reacts with caustic soda, the products are PH3 and NaH2PO2. This reaction is an example of
(a)Oxidation
(b)Reduction
(c)Oxidation and reduction (redox)
(d)Neutralization
Question 26. 2CuI-> Cu + CuI2, the reaction is
(a)Redox
(b)Neutralization
(c)Oxidation
(d)Reduction
Question 27. When copper turning are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper
(a)Displaces silver from the solution
(b)Forms a blue colored complex with AgNO3
(c)Is oxidized to $Cu_2+$
(d)Is reduced to $Cu_2+$
Question 28. Zn2+ (aq) +2e -> Zn(s). this is
(a)Oxidation
(b)Reduction
(c)Redox reaction
(d)None of these
1. b) Except (b) all other reactions involve compounds. 2. (d) CuSO4 +H2S -> CuS + H2SO4
It is a Double decomposition 3.(c) Iron is more reactive than copper, hence Cu will not displace iron from iron sulphate, hence no reaction will take place. 4.(b) Zn + 2HCl -> ZnCl2 + H2 5.(c) Na2CO3+ 2HCI -> 2NaCI + H2O + CO2 6.(c) 7.(c) Cu +4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O 8.(b) 9.(d) 10.(b) Here H2S is oxidizing in to H2O, hence behave as a reducing agent. 11.(a) 12.(b) 13.(d) 14. (b) Na2CO3 + 2HCI ->2NaCI + CO2 + H2O 15.(b) The reaction represents a neutralization reaction in which base (NaOH) reacts with an acid (HNO3) to form salt (NaNO3) and water (H2O). 16.(d) 17.(a) Write silver chloride in sunlight turns to grey. 18.(b) 19.(a) 2Cu + O2 -> 2CuO
Black 20.(a) 4P + 3O2 ->2P2O3
(Oxidation)
Or 4P + 5O2 ___ 2P2O5
(Oxidation) 21.(c) During rusting iron get oxidized to form rust (Fe2O3 x H2O) 22.(c) Gold is very least reactive hence does not corrode at all. 23.(a)
24.(c)
N the given reaction H2 is undergoing oxidation, hence behave as reducing agent. 25.(c)
It shows oxidation and reduction (redox) properties. 26.(a) Oxidation and reduction both occur so the reaction is redox. 27.(c) Cu is above of Ag in electrochemical series and thus
Cu + 2Ag+-> Cu2+ + 2Ag reaction occurs. 28.(b) reduction.
