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Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations

Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations is an online chapter test in the Bihar Board Class 10 (Matric) pattern, covering Chemical Reactions and Equations. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.

20
Questions
20
Minutes
20
Marks
None
Negative marking
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Topics in this test

TopicQuestions
Chemical Reactions and Equations20

Difficulty: 6 easy · 10 medium · 4 hard

Sample questions with answers

The first 5 questions of this free test.

  1. Q1. Silver chloride turns grey when kept in sunlight, decomposing into silver and chlorine. This reaction, used in black-and-white photography, is a decomposition reaction caused by:

    • A. Light energy
    • B. Heat energy
    • C. Electrical energy
    • D. Mechanical energy
    Solution

    Silver chloride breaks down into silver metal and chlorine gas when exposed to sunlight, so light energy brings about this decomposition.

  2. Q2. To balance the skeletal equation $Fe + H_2O \rightarrow Fe_3O_4 + H_2$, the coefficients required for $Fe$, $H_2O$ and $H_2$ respectively are:

    • A. $3, 4, 4$
    • B. $3, 4, 3$
    • C. $2, 4, 4$
    • D. $3, 3, 4$
    Solution

    Balancing iron, oxygen and hydrogen atoms on both sides gives $3Fe + 4H_2O \rightarrow Fe_3O_4 + 4H_2$.

  3. Q3. On strong heating, green ferrous sulphate crystals first lose water of crystallisation and then decompose further into ferric oxide, sulphur dioxide and sulphur trioxide. This second step is best classified as:

    • A. An endothermic decomposition reaction that is also a redox reaction
    • B. An exothermic combination reaction
    • C. A displacement reaction that releases oxygen
    • D. A neutral reaction with no change in oxidation states
    Solution

    Heat is continuously absorbed and the oxidation state of iron changes, so this decomposition is also a redox reaction.

  4. Q4. In the reaction $ZnO + C \rightarrow Zn + CO$, which substance acts as the reducing agent?

    • A. Carbon
    • B. Zinc oxide
    • C. Zinc
    • D. Carbon monoxide
    Solution

    Carbon gets oxidised to carbon monoxide while reducing zinc oxide to zinc, so carbon is the reducing agent.

  5. Q5. Electrolysis of water decomposes it into hydrogen and oxygen gases. The volume of hydrogen gas collected compared to oxygen gas is in the ratio:

    • A. $2:1$
    • B. $1:2$
    • C. $1:1$
    • D. $3:1$
    Solution

    Water decomposes into hydrogen and oxygen in a 2:1 volume ratio, as represented by $2H_2O \rightarrow 2H_2 + O_2$.

Frequently asked questions

How many questions are in the Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations?

20 questions for 20 marks, to be answered in 20 minutes.

Is there negative marking in the Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations?

No — wrong answers are not penalised in this test.

Which topics does the Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations cover?

Chemical Reactions and Equations (20 questions).

Is the Bihar Board Class 10 (Matric) Science · Ch 1: Chemical Reactions and Equations free?

Yes — this test is free. Create a free SeatBeat account and attempt it online; you get the solutions and your score analysis after submitting.

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