1
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

Which of the following represents the lattice structure of $$\mathrm{A_{0.95}O}$$ containing $$\mathrm{A^{2+},A^{3+}}$$ and $$\mathrm{O^{2-}}$$ ions?

A
B only
B
A and B only
C
A only
D
B and C only
2
JEE Main 2023 (Online) 25th January Morning Shift
+4
-1

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

A
$$\mathrm{{X_2}{Y_{1.5}}}$$
B
$$\mathrm{{X_{3}}{Y_2}}$$
C
$$\mathrm{X{Y_{2.5}}}$$
D
$$\mathrm{{X_{2.5}}Y}$$
3
JEE Main 2022 (Online) 30th June Morning Shift
+4
-1

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, NA = 6.0 $$\times$$ 1023 mol$$-$$1.

A
5 NA
B
6 NA
C
15 NA
D
25 NA
4
JEE Main 2022 (Online) 28th June Morning Shift
+4
-1

The incorrect statement about the imperfections in solids is :

A
Schottky defect decreases the density of the substance.
B
Interstitial defect increases the density of the substance.
C
Frenkel defect does not alter the density of the substance.
D
Vacancy defect increases the density of the substance.
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