JEE Main 2022 (Online) 26th July Evening Shift | d and f Block Elements Question 22 | Chemistry

JEE Main 2022 (Online) 26th July Evening Shift

MCQ (Single Correct Answer)

-1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.

Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.

In the light of the above statements, choose the most appropriate answer from the options given below.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is NOT the correct explanation of A.

A is true but R is false.

A is false but R is true.

JEE Main 2022 (Online) 28th June Morning Shift

MCQ (Single Correct Answer)

-1

Which one of the lanthanoids given below is the most stable in divalent form?

Ce (Atomic Number 58)

Sm (Atomic number 62)

Eu (Atomic Number 63)

Yb (Atomic Number 70)

JEE Main 2022 (Online) 27th June Evening Shift

MCQ (Single Correct Answer)

-1

The 'f' orbitals are half and completely filled, respectively in lanthanide ions

[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

Eu²⁺ and Tm²⁺

Sm²⁺ and Tm³⁺

Tb⁴⁺ and Yb²⁺

Dy³⁺ and Yb³⁺

JEE Main 2022 (Online) 26th June Evening Shift

MCQ (Single Correct Answer)

-1

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

Ce (At. No. 58)

La (At. No. 57)

Lu (At. No. 71)

Gd (At. No. 64)

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