d & f Block Elements

1. Sneha is studying the electronic configuration of a transition element X in +3 oxidation state, which is [Ar]3d ⁵. What is the atomic number of this element?

• 25

• 26

• 27

• 24

During a chemistry class, Advait asked his classmates to identify the non-transition element among the following options (if all of them have stable oxidation state +2)

• (n-1)d⁵ ns¹

• (n-1)d⁵ ns²

• (n-1)d¹⁰ ns¹

• (n-1)d¹⁰ ns²

In a chemistry class, Shreya is curious about which transition element has the highest enthalpy of atomization. She comes across the following options:

• P = 3d³ 4s²

• Q = 3d⁴ 4s²

• R = 3d⁵ 4s²

• S = 3d¹⁰ 4s²

Aashi is conducting an experiment in her chemistry lab. In the first picture(A), she has a sample of pure metal. Can you identify what the second(B) and third picture(C) represent based on her findings?

• alloy, mischmetal

• mischmetal, interstitial compound

• salt, interstitial compound

• interstitial compound, alloy

1. In a chemistry class, Neha is studying the electronic configuration of Cu(II), which is 3d ⁹, while Dia is looking at Cu(I), which has an electronic configuration of 3d¹⁰. Which of the following statements is correct?

• 0. Cu(II) is more stable

• 0. Cu(II) is less stable

• 0. Cu(I) and Cu(II) are equally stable
     

• 0. Stability of Cu(I) and Cu(II) depends on the nature of copper salts

4. Tara is conducting an experiment to understand the magnetic nature of elements. She needs to identify the configuration of a transition element that shows the highest magnetic moment. Which configuration should she choose?

• 0. 3d⁷

• 0. 3d⁵

• 0. 3d⁸

• 0. 3d²

A transition element 'X' is placed in the first series of transition elements. It has the following characteristics: i) It is a coinage metal. ii) It has a positive reduction potential. iii) It does not react with HCl but reacts with Nitric acid. Which of the following is element X likely to be?

• Gold

• Iron

• Copper

• Chromium

Choose the correct statement(s) about Zn²⁺ ion: P: It is diamagnetic in nature Q: It forms colourless salt. R: It shows d-d transition.

• Only P is correct statement.

• P & Q are correct statements.

• Q & R are correct statements.

• P, Q & R all are correct statements.

Zr and Hf are very hard to separate because: I. they have almost same atomic radii. II. They belong to same group. III. They belong to same series. IV. They have same general electronic configuration.

• I, II & IV are correct.

• II, III & IV are correct.

• I, II & III are correct.

• I, II, III & IV are correct.

4. Tara is conducting an experiment in her chemistry lab. She learns that transition elements form colored salts due to the presence of unpaired electrons. Which of the following compounds that she is working with will be colored in the solid state?

• 0. Ag₂SO₄

• 0. CuF₂

• 0. ZnF₂

• 0. Cu₂Cl₂