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 8.
Zn + H2SO4(dil) ->ZnSO4 + H2
Above reaction is
(a)Decomposition reaction
(b)Single displacement reaction
(c)Combination reaction
(d)Synthesis reaction

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
(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

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
(c)Remain white

Question 18.
Black and white photography uses
(a)Decomposition of silver chloride
(b)Decomposition of silver bromide
(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
(d)None of these

Question 21.
Rusting of an iron is an example of

Question 22.
Which of the following does not corrode when exposed to the atmosphere-
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
(c)Oxidation and reduction (redox)

Question 26.
2CuI-> Cu + CuI2, the reaction is

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
(c)Redox reaction
(d)None of these

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Practice Question

Question 1 Which among the following is not a base?
B) $NH_4OH$
C) $C_2H_5OH$
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene

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