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Chemistry Assertion (A) & Reason (B) MCQ

The p-Block Elements · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 5 questions.

Questions

Assertion (A) & Reason (B) MCQ

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5 questions · 4 auto-graded MCQ + 1 self-marked written.

MCQ 11 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 each question.
Assertion $(A)$ : If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge.
Reason $(R)$ : Aluminium is trivalent while silicon is tetravalent.
  • ✓
    $A$ and $R$ both are correct, and $R$ is the correct explanation of $A.$
  • B
    $A$ and $R$ both are correct, but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ and $R$ both are false.
Answer
Correct option: A.
$A$ and $R$ both are correct, and $R$ is the correct explanation of $A.$
In aluminosilicates $($anion$),$ some of silicon atoms are replaced by aluminum.
Since, aluminum is trivalent while silicon is tetravalent hence we get negatively charged ion.
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MCQ 21 Mark
Directions : In the following questions, the Assertions $(A) $ and Reason $(s) (R)$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: Thallium compounds are stable in $+ 1$ oxidation state.
Reason: The $6s^2$ electrons in $\ce{Tl}$ show reluctance in participating in bond formation.
  • ✓
    Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • B
    Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • C
    Assertion is correct but Reason is incorrect.
  • D
    Both Assertion and Reason are incorrect.
Answer
Correct option: A.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Inert pair effect. Because of poor shielding by $f,$ Increased effective nuclear charge holds the $6s$ electrons tightly.
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MCQ 31 Mark
Directions : In the following questions, the Assertions $(A)$ and Reason $(s) (R)$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion : In $p -$ block elements a lot of variation in properties of elements in a group is observed.
Reason : Difference in inner core of electronic configuration greatly influences the physical and chemical properties of elements. In $p - $ block elements a lot of variation in properties of elements in a group is observed.
  • ✓
    Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • B
    Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • C
    Assertion is correct but Reason is incorrect.
  • D
    Both Assertion and Reason are incorrect.
Answer
Correct option: A.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The inner core of the electronic configuration may, however, differ.
The difference in inner core of elements greatly influences their physical properties $($such as atomic and ionic radii, ionisation enthalpy, etc.$)$ as well as chemical properties.
Consequently, a lot of variation in properties of elements in a group of $p -$ block is observed.
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MCQ 41 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 each question.
Assertion $(A)$ : Silicons are water repelling in nature.
Reason $(R)$ : Silicons are organosilicon polymers, which have $\left(\mathrm{R}_2 \mathrm{SiO}{-}\right)$ as repeating unit.
  • A
    $A$ and $R$ both are correct and $R$ is the correct explanation of $A.$
  • ✓
    Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A.$
  • C
    $A$ and $R$ both are not true.
  • D
    $A$ is not true but $R$ is true.
Answer
Correct option: B.
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A.$
Silicones are organosilicon polymers and they are hydrophobic in nature.
Silicones neither react nor absorb water molecules.
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Question 51 Mark
Select the members of group 14 that:
  1. Forms the most acidic dioxide.
  2. Is commonly found in +2 oxidation state.
  3. Used as semiconductor,.
  4. Exhibit highest catenation tendency.
Answer
  1. Carbon forms $\mathrm{CO}_2$ which is most acidic.
  2. Lead shows +2 oxidation state commonly.
  3. Silicon/ Germanium.
  4. Carbon.
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