D&F block element -Assertion and Reason- MCQ - Basic level

Assertion and Reason- MCQ - Basic level

Dear Readers,

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. Assertion : Cuprous ion (Cu⁺) has unpaired electrons while cupric ion (Cu⁺⁺) does not
Reason : Cuprous ion (Cu⁺) is colourless where as cupric ion (Cu⁺⁺) is blue in the aqueous solution

•  If both assertion and reason are true and the reason is the correct explanation of the assertion.
•  If both assertion and reason are true but reason is not the correct explanation of the assertion.
•  If assertion is true but reason is false.
•  If the assertion and reason both are false
•  If assertion is false but reason is true.

If assertion is false but reason is true.

Q2. Assertion :Zn²⁺ is diamagnetic
Reason : The electrons are lost from 4 s orbital to form Zn²⁺

•  If both assertion and reason are true and the reason is the correct explanation of the assertion
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•  If assertion is true but reason is false.
•  If the assertion and reason both are false
•  If assertion is false but reason is true.

If both assertion and reason are true but reason is not the correct explanation of the assertion

Q3. Assertion : Transition metals show variable valence.
Reason : Due to a large energy difference between the ns² and (n-1)d electrons.

•  If both assertion and reason are true and the reason is the correct explanation of the assertion
•   If both assertion and reason are true but reason is not the correct explanation of the assertion.
•  If assertion is true but reason is false.
•   If the assertion and reason both are false.
•  If assertion is false but reason is true.

If assertion is true but reason is false.

Q4. Assertion : The aqueous solution of FeCl₃ is basic in nature.
Reason : FeCl₃ hydrolyses in water

•   If both assertion and reason are true and the reason is the correct explanation of the assertion
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•   If assertion is true but reason is false.
•   If the assertion and reason both are false.
•  If assertion is false but reason is true.

If assertion is false but reason is true.

Q5. Assertion : AgCl dissolves in NH₄OH solution.
Reason : Due to formation of a complex.

•   If both assertion and reason are true and the reason is the correct explanation of the assertion
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•   If assertion is true but reason is false.
•  If the assertion and reason both are false.
•   If assertion is false but reason is true.

If both assertion and reason are true and the reason is the correct explanation of the assertion

Q6. Assertion : Pure iron is not used for making tools and machines.
Reason : Pure iron is hard

•  If both assertion and reason are true and the reason is the correct explanation of the assertion
•   If both assertion and reason are true but reason is not the correct explanation of the assertion.
•   If assertion is true but reason is false.
•  If the assertion and reason both are false
•   If assertion is false but reason is true.

If assertion is true but reason is false.

Q7. Assertion : Solution of Na₂CrO₄ in water is intensely coloured.
Reason : Oxidation state of Cr in Na₂CrO₄ is +VI.

•  If both assertion and reason are true and the reason is the correct explanation of the assertion.
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•   If assertion is true but reason is false.
•  If the assertion and reason both are false
•  If assertion is false but reason is true.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

Q8. Assertion : Copper metal gets readily corroded in an acidic aqueous solution.
Reason : Free energy change for this process is positive.

•   If both assertion and reason are true and the reason is the correct explanation of the assertion
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•  If assertion is true but reason is false.
•  If assertion is true but reason is false.
•  If assertion is false but reason is true.

If assertion is true but reason is false.

Q9. Assertion : The free gaseous Cr atom has six unpaired electrons.
Reason : Half filled "s" orbital has greater stability.

•   If both assertion and reason are true and the reason is the correct explanation of the assertion
•   If both assertion and reason are true but reason is not the correct explanation of the assertion.
•   If assertion is true but reason is false.
•   If the assertion and reason both are false.
•   If assertion is false but reason is true.

If assertion is true but reason is false.

Q10. Assertion :Fe²⁺ is paramagnetic.
Reason : Fe²⁺ contains four unpaired electrons.

•  If both assertion and reason are true and the reason is the correct explanation of the assertion
•  If both assertion and reason are true but reason is not the correct explanation of the assertion
•   If assertion is true but reason is false.
•  If the assertion and reason both are false.
•  If assertion is false but reason is true.

If both assertion and reason are true and the reason is the correct explanation of the assertion