1
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language

At 298 K, the standard electrode potentials of Cu2+ / Cu, Zn2+ / Zn, Fe2+ / Fe and Ag+ / Ag are 0.34 V, $$-$$0.76 V, $$-$$0.44 V V and 0.80 V, respectively.

On the basis of standard electrode potential, predict which of the following reaction cannot occur?

A
CuSO4(aq) + Zn(s) $$\to$$ ZnSO4(aq) + Cu(s)
B
CuSO4(aq) + Fe(s) $$\to$$ FeSO4(aq) + Cu(s)
C
FeSO4(aq) + Zn(s) $$\to$$ ZnSO4(aq) + Fe(s)
D
2CuSO4(aq) + 2Ag(s) $$\to$$ 2Cu(s) + Ag2SO4(aq)
2
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements

Statement I : Primary aliphatic amines react with HNO2 to give unstable diazonium salts.

Statement II : Primary aromatic amines react with HNO2 to form diazonium salts which are stable even above 300 K.

In the light of the above statements, choose the most appropriate answer from the options given below.

A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
3
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language

In one molal solution that contains 0.5 mole of a solute, there is

A
500 mL of solvent
B
500 g of solvent
C
100 mL of solvent
D
1000 g of solvent
4
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language

RMgX + CO2 $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{ether}^{dry}} $$ Y $$\buildrel {{H_3}{O^ + }} \over \longrightarrow $$ RCOOH

What is Y in the above reaction?

A
RCOO$$-$$Mg+X
B
R3CO$$-$$Mg+X
C
RCOO$$-$$X+
D
(RCOO)2Mg
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