Which of the following statements is NOT true about vacancy defect?
It arises when a particle is missing from its regular site in the crystal lattice during crystallisation.
The vacancy defect can also be developed when the substance is heated.
In this the mass of substance decreases.
The density of crystal remains same when vacancy defect is created.
Which of the following is the most abundant chalcogens?
Oxygen
Sulphur
Selenium
Tellurium
What is the number of moles of ' C ' atoms and ' H ' atoms respectively present in n mole molecule represented as follows?

$n$ and n
$2 n$ and $2 n$
$2 n$ and $n$
$3 n$ and n
For a certain reaction, $\Delta \mathrm{H}^{\circ}=219 \mathrm{~kJ}$ and $\Delta \mathrm{S}^{\circ}=-21 \mathrm{JK}^{-1}$. Find the value of $\Delta \mathrm{G}^{\circ}$.
202.74 kJ
-312.74 kJ
225.26 kJ
-325.06 kJ
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