JEE Main 2021 (Online) 24th February Evening Slot | Periodic Table & Periodicity Question 52 | Chemistry

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JEE Main 2021 (Online) 24th February Evening Slot

MCQ (Single Correct Answer)

-1

What is the correct order of the following elements with respect to their density?

Cr < Zn < Co < Cu < Fe

Cr < Fe < Co < Cu < Zn

Zn < Cr < Fe < Co < Cu

Zn < Cu < Co < Fe < Cr

JEE Main 2021 (Online) 24th February Morning Slot

MCQ (Single Correct Answer)

-1

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :

Al < Mg < Si < S < P

Al < Mg < S < Si < P

Mg < Al < Si < S < P

Mg < Al < Si < P < S

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

The correct order of the ionic radii of
O^2–, N^3–, F^– , Mg²⁺, Na⁺ and Al³⁺ is :

N^3– < O^2– < F^– < Na⁺ < Mg²⁺ < Al³⁺

N^3– < F^– < O^2– < Mg²⁺ < Na⁺ < Al³⁺

Al³⁺ < Na⁺ < Mg²⁺ < O^2– < F^– < N^3–

Al³⁺ < Mg²⁺ < Na⁺ < F^– < O^2– < N^3–

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-1

The incorrect statement(s) among (a) - (c) is (are)

(a) W(VI) is more stable than Cr(VI).
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.

(a) and (b) only

(a) only

(b) only

(b) and (c) only

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