MCQ
For which of these reactions will there be $\Delta$S negative :
- ✓$NH _3(g) \rightarrow NH _3( l )$
- B$H _2(g)+ I _2(g) \rightarrow 2 HI ( g )$
- C$CaCO _3$ (s) $\rightarrow CaO$ (s) $+ CO _2$ (g)
- DAll of these
✓
Answer
Correct option: A.
$NH _3(g) \rightarrow NH _3( l )$
(A) $NH _3(g) \rightarrow NH _3( l )$
Gas changes to liquid so entropy decreases.
Gas changes to liquid so entropy decreases.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The electronic configuration of central atom of complex $[MnO_4]^{2-}$ is
→Which is the correct alternate for hydrolysis constant of $N{H_4}CN$
→Assertion : Phenol is a strong acid than ethanol.
Reason : Groups with $+M$ effect decreases acidity at $p-$ position
→Reason : Groups with $+M$ effect decreases acidity at $p-$ position
Given that the abundances of isotopes ${ }^{54} \mathrm{Fe},{ }^{56} \mathrm{Fe}$ and ${ }^{57} \mathrm{Fe}$ are $5 \%, 90 \%$ and $5 \%$, respectively, the atomic mass of $\mathrm{Fe}$ is
→(product)
$K_{sp}$ for $AgBr$ at $25\,^oC$ is $4.9 × 10^{-13}$. How much $AgBr$ will dissolved in $20\ litres$ of its saturated solution if molecular weight of $AgBr =$ $188$
→Which of the following fluorides can react with fluorine
Alkene $R - C - H = C{H_2}$ reacts readily with ${B_2}{H_{6}}$ and the product on oxidation with alkaline hydrogen peroxides produces
→Which of the following molecule/species is having minimum number of lone pair on its central atom ?
$6.02 \times 10^{20}$ molecules of urea are present in $200\,mL$ of its solution. The concentration of urea solution is .............. $\mathrm{M}$
→