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chemical reactions and equations Science - chemical reactions and equations

Gujarat Board (GSEB) - STD 10 - Science (GSEB - English Medium). 165 questions in this chapter.

Question types

chemical reactions and equations question types

165 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

165
Questions
7
Question groups
5
Question types
Sample Questions

chemical reactions and equations questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q1 Mark
Rancidity can be prevented by........
  • A
    adding antioxidants.
  • B
    storing the food in freeze.
  • C
    keeping food away from the light.
  • ✓
    All of the given.

Answer: D.

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Q 2M.C.Q1 Mark
Which of the following is not a single displacement reaction?
  • A
    $CuO + H 2= H 2 O + Cu$
  • B
    $Zn + CuSO4 = ZnSO4 + Cu$
  • ✓
    $4NH3 + 5O2 = 4NO + 6H2O$
  • D
    $Zn + 2HCl  = ZnCl2 + H2$

Answer: C.

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Q 3M.C.Q1 Mark
An element $X$ on exposure to moist air turns reddish brown and new compound $Y$ is formed. Identify $X$ and $Y.$
  • ✓
    $X = Fe, Y = Fe2O3$
  • B
    $X = Ag, Y = Ag2S$
  • C
    $X = Cu, Y = CuO$
  • D
    $X = AI, Y = Al2O3$

Answer: A.

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Q 4M.C.Q1 Mark
Identify the reducing agent in the following reaction : Reaction : $3O2 (g) + 2H2S (g)  =  2H2O(l) + 2SO2(g).$
  • A
    $O2$
  • ✓
    $H2S$
  • C
    $C.H2O$
  • D
    $SO2$

Answer: B.

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Q 5M.C.Q1 Mark
Both $H2$ and $CO2$ gases are ...
  • A
    heavier than air
  • ✓
    colourless
  • C
    acidic in nature
  • D
    soluable in water

Answer: B.

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Q 11True-False1 Mark
In reaction, $MnO _4^{2-} \rightarrow MnO _2+ MnO _4^{1-}, MnO _4^{2-}$ acts both as oxidising agent as well as reducing agent.
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Q 15True-False1 Mark
The proportion by volume of $\mathrm{H}_2$ and $\mathrm{O}_2$ gases obtained at electrodes during electrolysis of water is$ 1:1.$
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Q 20[1 Mark Questions]1 Mark
Identify the type of reaction for the following reaction : $2 KClO _3(s) \stackrel{\text { Heat }}\rightarrow {\text { Catalyst }} 2 KCl ( s )+3 O _2(g)$
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Q 21[2 Mark Questions]2 Marks
Write the balanced equations for the following chemical reactions.
(i) Hydrogen + chlorine $\rightarrow$ Hydrogen chloride
(ii) Barium chloride + Aluminium sulphate $\rightarrow$ Barium sulphate + Aluminium chloride
(iii) Sodium + water $\rightarrow$ sodium hydroxide + Hydrogen
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Q 24[2 Mark Questions]2 Marks
Which among the following are physical or chemical changes?
$(a)$ Evaporation of petrol
$(b)$ Burning of liquefied petroleum gas
$(c)$ Curdling of milk
$(d)$ Heating of an iron rod to red hot
$(e)$ Sublimation of solid ammonium chloride.
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Q 28[3 Mark Questions]3 Marks
Write the balanced chemical equation for the following reactions and identify the type of reaction in each case.
$(a)$ In Thermite reaction, iron $(III)$ oxide reacts with aluminium and gives molten iron and aluminium oxide.
$(b)$ Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form soli d magneslum nitride.
$(c)$ Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
$(d)$ Ethanol is burnt in air to form carbon dioxide, water and releases heat.
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Q 30[3 Mark Questions]3 Marks
Translate the following statements into chemical equations and then balance them.
$(a)$ Hydrogen gas combines with nitrogen to form ammonia.
$(b)$ Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
$(c)$ Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
$(d)$ Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
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