MCQ
$4.0\, L$ of an ideal gas is allowed to expand isothermally into vacuum until the total volume is $20\, L.$ The amount of heat absorbed in this expansion is $.....\,L\,atm$
- A$10$
- B$20$
- ✓$0$
- D$1$
$P _{\text {ext }}=0, w =0$
$q =0, \Delta U =0$
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Statement $I :$ In 'Lassaigne's Test, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement $II :$ If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give $NaCN$ and $Na _{2} S$.
In the light of the above statements, choose the most appropriate answer from the options given below...