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Chemical Reactions and Equations Science - Chemical Reactions and Equations

UP Board (UPMSP) - STD 10 - Science (UPMSP - English Medium). 75 questions in this chapter.

Question types

Chemical Reactions and Equations question types

75 questions across 5 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

75
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5
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
Which of the following are combination reactions?
  1. $2\text{KCIO}_3\xrightarrow{\text{Heat}}2\text{KCI}+3\text{O}_2$
  2. $\text{MgO}+\text{H}_2\text{O}\rightarrow\text{Mg(OH)}_2$
  3. $4\text{AI + 3O}_2\rightarrow\ 2\text{AI}_2\text{O}_3$
  4. $\text{Zn + FeSO}_4\rightarrow\text{ZnSO}_4+\text{Fe}$
  • A
    Both $1$ and $3$
  • B
    Both $3$ and $4$
  • C
    Both $2$ and $4$
  • ✓
    Both $2$ and $3$

Answer: D.

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Q 2M.C.Q1 Mark
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
  1. Displacement reaction.
  2. Precipitation reaction.
  3. Combination reaction.
  4. Double displacement reaction.
  • A
    Only $1$
  • B
    Only $2$
  • C
    Only $4$
  • ✓
    $2$ and $4$

Answer: D.

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Q 3M.C.Q1 Mark
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
  • A
    $2H_2(l) + O_2(l) \rightarrow 2H_2O(g)$
  • B
    $2H_2(g) + O_2(l) \rightarrow 2H_2O(l)$
  • ✓
    $2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$
  • D
    $2H_2(g) + O_2(g) \rightarrow 2H_2O(g)$

Answer: C.

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Q 4M.C.Q1 Mark
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
  • A
    Lead sulphate (insoluble).
  • ✓
    Lead acetate.
  • C
    Ammonium nitrate.
  • D
    Potassium sulphate.

Answer: B.

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Q 5M.C.Q1 Mark
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
  • ✓
    $KMnO _4$ is an oxidising agent, it oxidises $FeSO _4$
  • B
    $FeSO _4$ acts as an oxidising agent and oxidises $KMnO _4$
  • C
    The colour disappears due to dilution, no reaction is involved
  • D
    $KMnO _4$ is an unstable compound and decomposes in presence of $FeSO _4$ to a colourless compound.

Answer: A.

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Q 6[1 Mark Questions]1 Mark
Balance the following chemical equations and identify the type of chemical reaction.$\text{Na(s)}+\text{S(s)}\xrightarrow{\text{Fuse}}\text{Na}_2\text{S(s)}$
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Q 8[1 Mark Questions]1 Mark
Balance the following chemical equations and identify the type of chemical reaction.$\text{H}_2\text{O}_2\text{(l)}\xrightarrow{\text{UV}}\text{H}_2\text{O(l)}+\text{O}_2\text{(g})$
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Q 11[2 Mark Questions]2 Marks
Write the balanced chemical equation for the following reaction and identify the type of reaction.
Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
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Q 12[2 Mark Questions]2 Marks
Write the balanced chemical equation for the following reaction and identify the type of reaction.
Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated $H _2 SO _4$.
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Q 13[2 Mark Questions]2 Marks
Write the balanced chemical equation for the following reaction and identify the type of reaction.
Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.
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Q 14[2 Mark Questions]2 Marks
Complete the missing components/ variables given as x and y in the following reaction.$\text{CaCO}_3\text{(s})\xrightarrow{\text{x}}\text{CaO(s)}+\text{CO}_2\text{(g)}$
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Q 15[2 Mark Questions]2 Marks
Write the balanced chemical equations for the following reaction.
Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogencarbonate.
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Q 16[3 Mark Questions]3 Marks
A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
  1. Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
  2. Name the black substance formed and give its chemical formula.
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Q 17[3 Mark Questions]3 Marks
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.
  1. Write a balanced chemical equation of the reaction involved.
  2. What other name can be given to this precipitation reaction?
  3. On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
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Q 18[3 Mark Questions]3 Marks
Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.
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Q 19[3 Mark Questions]3 Marks
A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.
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Q 20[3 Mark Questions]3 Marks
What happens when a piece of.
  1. Zinc metal is added to copper sulphate solution?
  2. Aluminium metal is added to dilute hydrochloric acid?
  3. Silver metal is added to copper sulphate solution? Also, write the balanced chemical equation if the reaction occurs.
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Q 21[5 marks Questions]5 Marks
During the reaction of some metals with dilute hydrochloric acid, following observations were made.
  1. Silver metal does not show any change.
  2. The temperature of the reaction mixture rises when aluminium (Al) is added.
  3. The reaction of sodium metal is found to be highly explosive.
  4. Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
Explain these observations giving suitable reasons.
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Q 22[5 marks Questions]5 Marks
What happens when zinc granules are treated with dilute solution of $H _2 SO _4, HCl , HNO _3, NaCl$ and NaOH , also write the chemical equations if reaction occurs.
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Q 23[5 marks Questions]5 Marks
Which among the following are physical or chemical changes?
  1. Evaporation of petrol.
  2. Burning of Liquefied Petroleum Gas (LPG).
  3. Heating of an iron rod to red hot.
  4. Curdling of milk.
  5. Sublimation of solid ammonium chloride.
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Q 24[5 marks Questions]5 Marks
On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed.
  1. Write a balanced chemical equation of the reaction.
  2. Identity the brown gas X evolved.
  3. Identity the type of reaction.
  4. What could be the pH range of aqueous solution of the gas X?
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Q 25[5 marks Questions]5 Marks
You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl , dilute $HNO _3, ZnCl _2$ and $H _2 O$. In which of the above containers these solutions can be kept?
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