CBSE Class 12 Chemistry Compartment Question Paper 2024 with Answer Key (Set 3 - 56/S/3)

The standard electrode potential for Ni²⁺/Ni couple is -0.25 V and for Ag⁺/Ag couple is 0.80 V. These two couples are connected to make an electrochemical cell. The redox reaction is spontaneous. The cell potential will be:

• (A) + 1.05 V
• (B) -1.05 V
• (C) + 0.55 V
• (D) -0.55 V

Out of Fe²⁺, Co²⁺, Cr³⁺, Ni²⁺, the one which shows the lowest magnetic moment is:
[Atomic number: Fe = 26, Co = 27, Ni = 28, Cr = 24]

• (A) Fe²⁺
• (B) Co²⁺
• (C) Cr³⁺
• (D) Ni²⁺

The geometry of paramagnetic nickel complex [NiCl₄]²⁻ is:

• (A) tetrahedral
• (B) octahedral
• (C) square planar
• (D) distorted octahedral

Which of the following does not undergo Aldol condensation?

• (A) HCHO
• (B) CH₃CH₂CHO
• (C) CH₃COCH₃
• (D) CH₃CHO

The IUPAC name of the complex [Co(NH₃)₅(ONO)]Cl₂ is:

• (A) Pentaamminenitrito-O-cobalt(III) chloride
• (B) Pentaamminenitrito-N-cobalt(III) chloride
• (C) Pentaamminenitro-cobalt(III) chloride
• (D) Pentaamminenitrito-cobalt(II) chloride

The most stable complex among the following is:

• (A) [Pt(NH₃)₂Cl₂]
• (B) [Ag(NH₃)₂]Cl
• (C) [Pt(en)₂Cl₂]²⁺
• (D) K₄[Fe(CN)₆]

If amines are arranged in increasing order of their basic strength in gaseous phase, the correct order will be:

• (A) NH₃ < CH₃NH₂ < (CH₃)₃N < (CH₃)₂NH
• (B) NH₃ < (CH₃)₂NH < (CH₃)₃N < CH₃NH₂
• (C) (CH₃)₃N < (CH₃)₂NH < CH₃NH₂ < NH₃
• (D) NH₃ < CH₃NH₂ < (CH₃)₂NH < (CH₃)₃N

The chemical test which can be used to distinguish between ethanamine and aniline is:

• (A) Haloform test
• (B) Tollens' test
• (C) Azo dye test
• (D) Hinsberg test

The correct IUPAC name of (CH₃)₃C-CH₂Br is:

• (A) 2,2-Dimethyl-2-bromopropane
• (B) 1-Bromo-2,2,2-trimethylethane
• (C) 2-Bromo-1,1,1-trimethylethane
• (D) 1-Bromo-2,2-dimethylpropane

Considering the strength of the ligand, the highest excitation energy will be observed in:

• (A) [Co(H₂O)₆]³⁺
• (B) [Co(NH₃)₆]³⁺
• (C) [Co(CN)₆]³⁻
• (D) [CoCl₆]³⁻

For a chemical reaction A → B, the rate doubles when the concentration of A is increased four times. The order of reaction is:

• (A) 2
• (B) 1
• (C) 1/2
• (D) Zero

Williamson's synthesis of preparing dimethyl ether is a/an:

• (A) electrophilic substitution
• (B) SN1 reaction
• (C) electrophilic addition
• (D) SN2 reaction

Write the reaction involved in:
(a) Reimer-Tiemann reaction
(b) Kolbe's reaction

Write the reaction of glucose with:
(a) HI
(b) Br₂ water

Give plausible explanation for:
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction.
(c) Aniline on nitration gives substantial meta product.