JEE Main 2023 (Online) 25th January Morning Shift | Solid State Question 11 | Chemistry

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JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at the center of cube. Y is at $$\frac{1}{3}^{\mathrm{rd}}$$ of the total faces. The empirical formula of the compound is :

$$\mathrm{{X_2}{Y_{1.5}}}$$

$$\mathrm{{X_{3}}{Y_2}}$$

$$\mathrm{X{Y_{2.5}}}$$

$$\mathrm{{X_{2.5}}Y}$$

JEE Main 2022 (Online) 30th June Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

An element X has a body centred cubic (bcc) structure with a cell edge of 200 pm. The density of the element is 5 g cm^$$-$$3. The number of atoms present in 300 g of the element X is _______________.

Given : Avogadro constant, N_A = 6.0 $$\times$$ 10²³ mol^$$-$$1.

5 N_A

6 N_A

15 N_A

25 N_A

JEE Main 2022 (Online) 28th June Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

The incorrect statement about the imperfections in solids is :

Schottky defect decreases the density of the substance.

Interstitial defect increases the density of the substance.

Frenkel defect does not alter the density of the substance.

Vacancy defect increases the density of the substance.

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

Given below are two statements.

Statement I : Frenkel defects are vacancy as well as interstitial defects.

Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres.

Choose the most appropriate answer for the statements from the options given below :

Statement I is false but Statement II is true

Both Statement I and Statement II are true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

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