JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

The correct order of bond enthalpy ($$\mathrm{kJ~mol^{-1}}$$) is :

$$\mathrm{C-C > Si-Si > Sn - Sn > Ge-Ge}$$

$$\mathrm{Si-Si > C-C > Ge-Ge > Sn-Sn}$$

$$\mathrm{C-C > Si-Si > Ge-Ge > Sn-Sn}$$

$$\mathrm{Si-Si > C-C > Sn-Sn > Ge-Ge}$$

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

For electron gain enthalpies of the elements denoted as $$\Delta_{\mathrm{eg}} \mathrm{H}$$, the incorrect option is :

$$\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{I})<\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{At})$$

$$\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{Te})<\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{Po})$$

$$\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{Cl})<\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{F})$$

$$\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{Se})<\Delta_{\mathrm{eg}} \mathrm{H}(\mathrm{S})$$

JEE Main 2023 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

-1

Highest oxidation state of Mn is exhibited in $$\mathrm{Mn_2O_7}$$. The correct statements about $$\mathrm{Mn_2O_7}$$ are

(A) Mn is tetrahedrally surrounded by oxygen atoms.

(B) Mn is octahedrally surrounded by oxygen atoms.

(D) Contains Mn-Mn bond.

Choose the correct answer from the options given below :

A and C only

A and D only

B and C only

B and D only

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

The Lewis acid character of boron tri halides follows the order :

$\mathrm{BI}_{3}>\mathrm{BBr}_{3}>\mathrm{BCl}_{3}>\mathrm{BF}_{3}$

$\mathrm{BCl}_{3}>\mathrm{BF}_{3}>\mathrm{BBr}_{3}>\mathrm{BI}_{3}$

$\mathrm{BF}_{3}>\mathrm{BCl}_{3}>\mathrm{BBr}_{3}>\mathrm{BI}_{3}$

$\mathrm{BBr}_{3}>\mathrm{BI}_{3}>\mathrm{BCl}_{3}>\mathrm{BF}_{3}$

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