1

The reaction  represents which among the following reactions.

  1. Synthesis
  2. Precipitation
  3. Neutralization
  4. Displacement
  5. Decomposition
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2

(vi)     What type of chemical reaction is represented by the equation 

Zn(s) + 2HCl(aq)  + H2(g)?

A      Displacement reaction

B      Combination reaction

C      Precipitation reaction

D      Decomposition reaction

E       Redox reaction

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3

(iii) A rapid chemical reaction that releases energy in form of light and heat is called 

  1.  combustion.
  2.  decomposition.
  3.  displacement. 
  4.  neutralization.
  5.  precipitation.
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4

Complete the following equations and determine the type of chemical reaction involved in each case.

(i)  Zn(s) + H2SO4( aq) ?

(ii)  AgNO3( aq) + NaCl( aq) ?              

(iii)  N2(g) + H2(g) ?    

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5

Give the name of the type of reaction represented by each of the following chemical equations.

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6

 State and describe the type of reaction in the following chemical equations: 

 (i) Fe(s) + CuSO4(aq) à FeSO4(aq) + Cu(s).

 (ii) Na2SO4(aq) + BaCl2(aq) à BaSO4(s) + 2NaCl(aq).

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7

7. (a) Briefly explain five importance of balancing chemical equations.

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8

(b) Give a balanced chemical equation for the reaction between sodium carbonate and hydrochloric acid. (7 marks)

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9

Classify the following reactions into oxidation and reduction reactions.

(i)  S( s) + O 2( g) ? SO 2( g)

(ii) N2( g) + 3H 2( g) ? 2NH 3( g)

(iii) Fe2+ (aq) ­ e ­  ? Fe3+ (aq)

(iv) Fe3+ (aq) ­ e  ­  ? Fe2+ (aq)  (4 marks)

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