Download App

Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry1 Mark
Question
Assertion (A) : Adsorption is a spontaneous process.
Reason (R) : Adsorption is always accompanied by decrease in free energy. When molecules are adsorbed, there is always a decrease in randomness of the molecules.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct but R is not correct explanation of A.
(c) Both A and R are wrong.
(d) A is correct but R is wrong.
✓

Answer

(a) Both A and R are correct and R is the correct explanation of A.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion And Reason." from Surface Chemistry→Surface Chemistry — all question types→Chemistry STD 12 question papers→Tamilnadu Board STD 12 question papers→Tamilnadu Board question paper generator→

Similar questions

Assertion (A) – In 3d transition elements, the expected decrease in atomic radius is observed from Sc to V, thereafter upto Cu, the atomic radius nearly remains the same.
Reason (R) – As we move from Sc to V, the added 3d electrons only partially shield the increased nuclear charge but upto Cu, the extra electron added to 3d sub-shell repel the 4s electrons and the slight increase in nuclear charge operated in opposite direction and it leads to constancy in atomic radii.
→
QUEsION Assertion (A) : The manufacture of sulphuric acid by contact process is an example of heterogeneous catalysis.
Reason $( R )$ : The catalyst Pt (or) $VO _5$, reactants and products are in different phases in contact process.
(a) Both A and R are correct and R is the correct explanation of A .
(b) Both $A$ and $R$ are correct but $R$ is not correct explanation of $A$.
(c) Both $A$ and $R$ are wrong.
(d) A is wrong but R is correct.
→
(A): Phenol is more reactive towards electrophilic substitution reaction.
Reason (R): In the case of phenol, the intermediate carbo cations is more resonance stabilized.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and are wrong
(c) A is correct but R is wrong
(d) A is wrong but R is correct
→
Assertlon(A): HCl is an strong acid while HCOOH is a weak acid.
Reason (R): HCI is completely ionised in water whereas HCOOH is paritally ionised in water.
(a) Both A and R are wrong
(b) A is wrong but R is correct
(c) A is correct but R is wrong
(d) Both A and R are correct and R is the correct explanation of A
→
(A): Both alcohol and ether have higher boiling point.
Reason (R): Both are having intermolecular hydrogen bonding.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are wrong
(c) A is correct but R is wrong
(d) A is wrong but R is correct
→
(A): Glycol is more viscous than ethanol.
Reason (R): Glycol contains two hydroxyl groups and the inter molecular hydrogen bonding is made much stronger resulting in a polymeric structure. This leads to high viscosity than ethanol.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and are correct but R is not the correct explanation of A.
(c) Both A and R are wrong
(d) A is correct but R is wrong
→
(A): Boiling point of ethanol is higher in comparison to methoxy methane.
Reason (R): Ethanol is associated with inter molecular hydroxide bonding whereas in methoxy methane, inter molecular hydrogen bonding is not present.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct but R is not the correct explanation of A.
(c) Both A and R are not correct
(d) A is correct but R is wrong
→
(A): The rate of a reaction increases with the increase in the concentration of the reactants.
Reason (R): The rate of the reaction depends upon the number of collisions between the reacting molecules. Higher the concentration, greater is the possibility for collision and hence the rate.
(a) Both A and R are correct and R is the correct explanation of A,
(b) Both A and R are correct but R is not the correct explanation of A
(c) A is correct but R is wrong
(d) A is wrong but R is correct
→
Assertion(A): When ammonia dissolved in water, H20 acts as an acid.
Reason (R): When ammonia is dissolved in water, it accepts a proton from water. According to Lowry – Bronsted theory, proton donor is acid and so water act as an acid.
(a) Both A and R are correct and R is the correct explanation of A
(b) Both A and R are wrong
(c) A is correct but R is not the correct explanation of A.
(d) A is wrong but R is correct. .
→
Assertion (A) : Lyophobic colloids like sols of gold will precipitate readily.
Reason (R) : In lyophobic colloids, no attractive force exists between the dispersed phase and dispersion medium and are less stable.
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct but R is not correct explanation of A.
(c) Both A and R are correct.
(d) A is correct but R is wrong.
→