JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties

Given below are two statements :
Statement I: The number of pairs among \([Al_2O_3, Cr_2O_3]\), \([Cl_2O_7, Mn_2O_7]\), \([Na_2O, V_2O_3]\) and \([CO, N_2O]\) that contain oxides of same nature (acidic, basic, neutral or amphoteric) is \(4\).
Statement II: Among \(Na_2O\), \(Al_2O_3\), \(CO\) and \(Cl_2O_7\), the most basic and acidic oxides are \(Na_2O\) and \(Cl_2O_7\), respectively.
In the light of the above statements, choose the correct answer from the options given below :

A Both Statement I and Statement II are true
B Both Statement I and Statement II are false
C Statement I is true but Statement II is false
D Statement I is false but Statement II is true

Verified Solution

Answer & Solution

Correct Answer

(A) Both Statement I and Statement II are true

Step-by-step Solution

Detailed explanation

Statement I: \(Al_2O_3\) and \(Cr_2O_3\) are both amphoteric oxides. \(Cl_2O_7\) and \(Mn_2O_7\) are both acidic oxides. \(Na_2O\) and \(V_2O_3\) are both basic oxides. \(CO\) and \(N_2O\) are both neutral oxides. All \(4\) pairs contain oxides of the same nature. Hence,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match \(List-I\) with \(List-II\).

\(List-I\)	\(List-II\)
\((A)\) \(Cd ( s )+2 Ni ( OH )_{3}( s ) \rightarrow CdO ( s )+2 Ni ( OH )_{2}( s )+ H _{2} O (l)\)	\((I)\) Primary battery
\((B)\) \(Zn ( Hg )+ HgO ( s ) \rightarrow ZnO ( s )+ Hg (l)\)	\((II)\) Discharging of secondary battery
\((C)\) \(2 PbSO _{4}( s )+2 H _{2} O (l) \rightarrow Pb ( s )+ PbO _{2}( s )+ 2 H _{2} SO _{4}( aq )\)	\((III)\) Fuel cell
\((D)\) \(2 H _{2}( g )+ O _{2}( g ) \quad \rightarrow 2 H _{2} O (l)\)	\((IV)\) Charging of secondary battery

Choose the correct answer from the options given below.

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