Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because (a) both belong to d-block. (b) both have same number of electrons. (c) both have similar atomic radius. (d) both belong to the same group of the periodic table.

Highest oxidation state of manganese in fluoride is +4 (MnF₄) but highest oxidation state in oxides is +7 (Mn₂O₇) because (a) fluorine is more electronegative than oxygen. (b) fluorine does not possess d-orbitals. (c) fluorine stabilises lower oxidation state. (d) in covalent compounds fluorine can formsingle bond only while oxygen forms double bond.

Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵. What is its atomic number? (a) 25 (b) 26 (c) 27 (d) 24

Metallic radii of some transition elements are given below. Which of these elements will have highest density?

The electronic configuration of Cu(II) is 3d⁹ whereas that of Cu(I) is 3d¹⁰. Which of the following is correct? (a) Cu(II) is more stable (b) Cu(II) is less stable (c) Cu(I) and Cu(II) are equally stable (d) Stability of Cu(I) and Cu(II) depends on nature of copper salts

The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr³⁺ ion is (a) 2.87 BM (b) 3.87 BM (c) 3.47 BM (d) 3.57 BM

When KMnO₄ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because (a) CO₂ is formed as the product. (b) The reaction is exothermic. (c) MnO₄⁻ catalyses the reaction. (d) Mn²⁺ acts as an auto-catalyst.

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________. a. Cell potential. b. Electromotive Force. c. Potential difference. d. Cell voltage.

How is electrical conductance of a conductor related with length and area of cross-section of the conductor? a. G = \(l. a.k^{-1}\) b. G = \(k. l.a^{-1}\) c. G = \(k.a. l^{-1}\) d. G = \(k. l.a^{-2}\)

Limiting molar conductivity of NH4OH is equal to -: a. Λᵒₘ(NH₄Cl) + Λᵒₘ(NaCl) + Λᵒₘ(NaOH) b. Λᵒₘ(NaOH) + Λᵒₘ(NaCl) - Λᵒₘ(NH₄Cl) c. Λᵒₘ(NaOH) - Λᵒₘ(NH₄Cl) - Λᵒₘ(HCl) d. Λᵒₘ(NH₄Cl) + Λᵒₘ(NaOH) - Λᵒₘ(NaCl)

Looking at the setup of an electrochemical cell, what happens when \(E_{ext}\) > 1.1 V

The potential of a hydrogen electrode at pH = 10 is a. 0.591 V b. 0.00 V c. – 0.591 V d. -0.059 V

Which cell will measure standard electrode potential of copper electrode? a. Pt (s) | H₂ (g, 0.1 bar) | H⁺ (aq., 1 M)

Assertion: Glycine must be taken through diet. Reason: It is essential amino acid. A. Assertion and reason both are correct statements and reason is correct explanation for assertion. B. Assertion and reason both are correct statements but reason is not correct explanation for assertion. C. Assertion is correct statement but reason is wrong statement. D. Assertion is wrong statement but reason is correct statement.

Assertion: The two strands of DNA are complementary to each other. Reason: The hydrogen bonds are formed between specific pairs of bases. A. Assertion and reason both are correct statements and reason is correct explanation for assertion. B. Assertion and reason both are correct statements but reason is not correct explanation for assertion. C. Assertion is correct statement but reason is wrong statement. D. Assertion is wrong statement but reason is correct statement.