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Chemical Reactions and Equations

10th Class - CBSE - Chemistry - 2421 Questions - 6 Concepts

Important Questions

Q1 Single Correct Hard
$$Na_2S_2O_3$$ can't be act as :
  • A. Complexing agent
  • B. Reducing agent
  • C. Oxidising agent
  • D. Precipitating agent

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Q2 Single Correct Hard
The reactant which is entirely consumed in the reaction is known as limiting reagent. In the reaction $$2A + 4B \rightarrow 3C + 4D$$, when 5 moles of $$A$$ react with 6 moles of $$B$$, then which is the limiting reagent and what would be the amount of $$C$$ formed respectively?
  • A. $$C$$, 4.5 mol
  • B. $$B$$, 4.5 mol
  • C. $$B$$, 3.5 mol
  • D. $$C$$, 4.0 mol

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Q3 Single Correct Hard
Identify the product of the given rearrangement reaction.
  • A.
  • B.
  • C.
  • D.

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Q4 Multiple Correct Hard
Lead nitrate on decomposition gives:
  • A. lead oxide
  • B. nitrogen dioxide
  • C. oxygen
  • D. nitrogen

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Q5 Single Correct Hard
The rate of a reaction doubles when its temperature changes from $$300\ K$$ to $$310\ K$$. Activation energy of such a reaction will be: 

$$[R = 8.314\ JK^{-1} mol^{-1}$$ and $$\log 2 = 0.301]$$
  • A. $$53.6\ kJ\ mol^{-1}$$
  • B. $$48.6\ kJ\ mol^{-1}$$
  • C. $$58.5\ kJ\ mol^{-1}$$
  • D. $$60.5\ kJ\ mol^{-1}$$

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Q6 Subjective Hard
In order to prepare $$100\,{\text{c}}{{\text{m}}^3}$$ of 0.250 M Barium chloride sol. the required amount of$${\text{BaC}}{{\text{l}}_{\text{2}}}{\text{.2}}{{\text{H}}_{\text{2}}}{\text{O}}$$ required will be:-

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Q7 Single Correct Hard
Among the following which one is correctly balanced.
(A) $${ I }_{ 2 }+5 { Cl }_{ 2 }+6{ H }_{ 2 }O\rightarrow 2HI{ O }_{ 3 }+10HCl$$

(B) $$3Mn{ O }_{ 2 }+HCl\rightarrow { H }_{ 2 }O+4Mn{ Cl }_{ 2 }+5{ Cl }_{ 2 }$$

(C) $$B{ Cl }_{ 3 }+3{ P }_{ 4 }+{ H }_{ 2 }\rightarrow BP+7HCl$$

(D) $$3{ C }_{ 3 }{ H }_{ 5 }{ \left( N{ O }_{ 3 } \right)  }_{ 3 }\rightarrow 4C{ O }_{ 2 }+2{ H }_{ 2 }O+8{ N }_{ 2 }+{ O }_{ 2 }$$

(E) $$2HCl+4Ba{ \left( OH \right)  }_{ 2 }\rightarrow 3Ba{ Cl }_{ 2 }+{10 H }_{ 2 }O$$
  • A. D
  • B. C
  • C. A
  • D. E
  • E. B

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Q8 Single Correct Hard
$$KMnO_4+H_2SO_4+FeSO_4 \rightarrow K_2SO_4 + MnSO_4+Fe_2(SO_4)_3+H_2O$$
Coefficients of sulphuric acid and ferric sulphate in the balanced equation of above reaction are______and ______respectively.
  • A. 8, 4
  • B. 5, 8
  • C. 4, 3
  • D. 8, 5

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Q9 Subjective Hard
How is potassium permanganate($$KMnO_4$$) prepared from $$MnO_2$$? Write the equations.

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Q10 Single Correct Hard
In a reaction of chlorine with excess of ammonia,the number of molecules of ammonia required in the balanced equation is:
  • A. $$2$$
  • B. $$3$$
  • C. $$5$$
  • D. $$8$$

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Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65
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