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Chemistry Assertion (A) & Reason (B) MCQ

The s-block Elements · Jharkhand Board (JAC) STD 11 Science (Jharkhand - English Medium). 5 questions.

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Assertion (A) & Reason (B) MCQ

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5 questions · auto-graded multiple-choice test.

MCQ 11 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion : $\text{LiCl}$ is covalent compound.
Reason : The eleetronegativity difference between $\text{Li }$ and $\text{Cl}$ is too small.
  • A
    Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • B
    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • ✓
    Assertion is true but Reason is false.
  • D
    Both Assertion and Reason are false.
Answer
Correct option: C.
Assertion is true but Reason is false.
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MCQ 21 Mark
Note : In the following question a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given below question.
Assertion $(A)$ : Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason $(R)$ : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.
  • ✓
    Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A.$
  • C
    Both $A$ and $R$ are not correct.
  • D
    $A$ is not correct but $R$ is correct.
Answer
Correct option: A.
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
$\ce{BeO}$ is more stable due to small size and strong polarizing power of $\mathrm{Be}^{2+}$.
As $\ce{BeO}$ is stable and $\mathrm{BeCO}_3$ is unstable.
When it is kept in the atmosphere of $\mathrm{CO}_2$ a reversible process occures and stability of $\mathrm{BeCO}_3$ increases.
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MCQ 31 Mark
Note : In the following questions a statement of Assertion $(A)$ followed by a statement of Reason $(R)$ is given. Choose the correct option out of the choices given below question.
Assertion $(A)$ : The carbonate of lithium decomposes easily on heating to form lithium oxide and $\mathrm{CO}_2$.
Reason $(R)$ : Lithium being very small in size polarises large carbonate ion leading to the formation of more stable $\mathrm{Li}_2 \mathrm{O}$ and $\mathrm{CO}_2$.
  • ✓
    Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A.$
  • C
    Both $A$ and $R$ are not correct.
  • D
    $A$ is not correct but $R$ is correct.
Answer
Correct option: A.
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
$\mathrm{Li}_2 \mathrm{CO}_3$ is unstable and decomposes on heating. Due to small size of $\mathrm{Li}^{+}$. It has strong polarizing power to disort electron cloud of $\mathrm{CO}_3^{-2}$. Lattice energy of $\mathrm{Li}_2 \mathrm{O}$ is higher than $\mathrm{Li}_2 \mathrm{CO}_3$.
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MCQ 41 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion : $\mathrm{Li}^{+}$ resembles $\text{Mg}.$
Reason : $\mathrm{Li}^{+}$ has same size as $\mathrm{Mg}^{2+}$.
  • A
    Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • ✓
    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • C
    Assertion is true but Reason is false.
  • D
    Both Assertion and Reason are false.
Answer
Correct option: B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
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MCQ 51 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion : $\mathrm{Cu}_2 \mathrm{Cl}_2$ is more covalent than $\text{NaCl} .$
Reason : $\mathrm{Cu}^{+}$has more polarising power than $\mathrm{Na}^{+}$con..
  • A
    Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • ✓
    Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • C
    Assertion is true but Reason is false.
  • D
    Both Assertion and Reason are false.
Answer
Correct option: B.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
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