D and F Block Elements Class 12 Assertion and Reason Questions
D and F Block Elements Class 12 Assertion and Reason Questions has been provided by JEE WALLAH to help students score good marks in their CBSE and Competitive exams. Assertion and Reason Questions on Class 12 Chemistry Chapter 4 D and F Block Elements is very important as these questions are asked in the Board Exam as well as JEE & NEET. Class 12 Chemistry Chapter 4 D and F Block Elements Assertion will help you check whether you have grasped the conceptual learning or not.
D and F Block Elements Class 12 Assertion and Reason Questions
Are you looking for a PDF file of Class 12 D and F Block Elements Assertion and Reasoning questions so that you can focus on your study to better perform in the upcoming CBSE Class 12 Board examination? If so, you are at the right place, our subject experts have prepared a set of D and F Block Elements Class 12 Assertion and Reason Questions in a PDF format which will boost up your preparation level.
Despite the fact that D and F Block Elements assertion and reasoning questions can be solved only by having proper conceptual knowledge, we are giving you some tips that can help you solve Assertion and Reasoning questions in Class 12 D and F Block Elements. The tips are : Read the Question Carefully; Analyze the Assertion statement; Analyze the Reason statement; Check if the Reason Statement of the D and F Block Elements Question Explains the Assertion Statement.
At last, our last tip is : Practice D and F Block Elements Class 12 Assertion and Reason Questions as much as possible.
1.
(A) - Zn, Cd and Hg are not regarded as transition elements.
(R) - The electronic configurations of Zn, Cd and Hg are represented by the general formula (n-1)d10ns2.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
2.
(A) - In transition elements, radii of 5d series are virtually the same as those of the corresponding members of 4d series.
(R) - The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
3.
(A) - Copper(II) iodide is not known.
(R) - Cu2+ oxidises I- to I2
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
4.
(A) - Cr2+ is reducing and Mn3+ is oxidising.
(R) - Cr2+ and Mn3+ have d4 configuration.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(b) Both A and R are true and R is not the correct explanation of A.
5.
(A) - The maximum oxidation state of chromium in its compounds is +6.
(R) - Chromium has only six electrons in ns and (n-1)d orbitals.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
6.
(A) - The ability of oxygen to stabilize high oxidation states exceeds that of fluorine.
(R) - The highest oxidation number in the oxides coincides with the group number.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(b) Both A and R are true and R is not the correct explanation of A.
7.
(A) - Copper dissolves in dilute nitric acid but not in dilute HCL.
(R) - Copper has positive E°.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
8.
(A) - In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest.
(R) - Zinc has greater number of unpaired electrons.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(c) A is true but R is false.
9.
(A) - Magnetic moment of Mn2+ is less than that of Cr2+
(R) - Higher the atomic number smaller is the magnetic moment.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(d) Both A and R are False.
10.
(A) - Cr(VI) in the form of dichromate in acidic medium is a strong oxidising agent where MoO3 and WO3 are not.
(R) - In d-block elements higher oxidation states are favoured by heavier members.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Also Read : Coordination Compounds Assertion and Reason
11.
(A) - In acidic medium, K2Cr2O7 exists as Cr2O72- (orange) while in basic medium it is converted to CrO42- (yellow).
(R) - K2Cr2O7 is hygroscopic in nature and changes colour on reaction with water.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(c) A is true but R is false.
12.
(A) - Iron(III) catalyses the reaction between iodide and persulphate ions.
(R) - Transition metals act as catalysts.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(b) Both A and R are true and R is not the correct explanation of A.
13.
(A) - KMnO4 acts as an oxidising agent in acidic, basic or neutral medium.
(R) - KMnO4 oxidises ferrous sulphate to ferric sulphate.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(b) Both A and R are true and R is not the correct explanation of A.
14.
(A) - Zr and Hf occur together in nature and are difficult to separate.
(R) - Zr and Hf have identical radii due to lanthanide contraction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
15.
(A) - Ce4+ is good analytical reagent.
(R) - Ce4+ has the tendency to change to Ce3+
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are False.
Answer
(a) Both A and R are true and R is the correct explanation of A.
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