🔥🌟 MDCAT/ECAT/FSC/XII Grand Chemistry MCQs Interactive Quiz # 2 🧪💡 | Learn & Practice!

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MDCAT/ECAT/FSC/XII Grand Chemistry MCQs Interactive Quiz # 2 🧪💡 | Learn & Practice!

1. The general formula for cycloalkane is:

a

CₙH₂ₙ₊₂

Wrong

b

CₙH₂ₙ₋₂

Wrong

c

CₙH₂ₙ

Right

d

CₙH₄ₙ

Wrong

✅ Correct Answer: (c) Cycloalkanes follow CₙH₂ₙ. Closing a ring removes two hydrogens compared to alkanes (CₙH₂ₙ₊₂).

2. NMR spectroscopy is concerned with the interaction of molecules with:

a

Infrared radiation

Wrong

b

Visible radiation

Wrong

c

Ultraviolet radiation

Wrong

d

Radio waves

Right

✅ Correct Answer: (d) Radio waves — NMR uses radio frequency in magnetic fields.

3. Oxidation state of manganese in KMnO₄ (potassium permanganate) is:

a

+7

Right

b

+4

Wrong

c

+5

Wrong

d

+2

Wrong

✅ Correct Answer: (a) +7 — Mn in KMnO₄ is in +7 oxidation state. In KMnO₄, K = +1 and each O = −2 (4 × −2 = −8).To balance the charges, Mn must be +7.

4. The greenhouse gas is:

a

O₂

Wrong

b

CO₂

Right

c

N₂

Wrong

d

Ar

Wrong

✅ Correct Answer: (b) CO₂— Major greenhouse gas trapping heat in Earth’s atmosphere.

5. Beryllium is diagonally related to this:

a

Li

Wrong

b

Si

Wrong

c

Mg

Wrong

d

Al

Right

✅ Correct Answer: (d) Radio waves — Aluminium (Al) — Beryllium shows a diagonal relationship with aluminium in the periodic table due to similar ionic size, charge density, and chemical properties.

6. The coordination number of cobalt in Na₄[Co(C₂O₄)₃] is:

a

3

Wrong

b

4

Wrong

c

6

Right

d

2

Wrong

✅ Correct Answer: (c) 6 — In Na₄[Co(C₂O₄)₃], each oxalate ion (C₂O₄²⁻) is bidentate (donates 2 pairs). With 3 oxalate ligands, the total coordination number is 3 × 2 = 6.

7. This element is not used in electroplating:

a

Sn

Wrong

b

Cr

Wrong

c

Zn

Wrong

d

Mn

Right

✅ Correct Answer: (d) Manganese (Mn) — Not commonly used for electroplating unlike Zn, Sn, Cr. Manganese (Mn), however, is not used in electroplating because it does not deposit smoothly or form protective, adherent coatings under normal electroplating conditions. Instead, manganese is more often used in steel alloys (to improve strength and hardness) rather than as an electroplating metal.Electroplating is commonly done with metals like Zn (zinc), Sn (tin), Cr (chromium), Ni (nickel), Ag (silver), and Au (gold) because they provide corrosion resistance, decorative finish, or hardness..

8. The extra glucose of bloodstream is converted into:

a

Fat

Wrong

b

Glycogen

Right

c

Gluconic acid

Wrong

d

Triglyceride

Wrong

✅ Correct Answer: (b) Glycogen — Extra glucose is stored in liver/muscles as glycogen.

9. On oxidation, a secondary alcohol gives:

a

Ether

Wrong

b

Aldehyde

Wrong

c

Ketone

Right

d

Amine

Wrong

✅ Correct Answer: (c) Ketone — A secondary alcohol on oxidation loses two hydrogen atoms—one from the hydroxyl group (–OH) and one from the carbon atom—and gets converted into a ketone. Secondary alcohols oxidize to ketones.

10. Ozone depletion in upper atmosphere is mainly caused by:

a

SO₂

Wrong

b

NO

Wrong

c

CO

Wrong

d

CFC

Right

✅ Correct Answer: (d) CFCs — Chlorofluorocarbons release chlorine radicals that destroy ozone.

11. The oxidation states of the elements of group VA:

a

+1 and +3

Wrong

b

-3 and -5

Wrong

c

-3, +3 and +5

Right

d

+1,-1 and +3

Wrong

✅ Correct Answer: (c) –3, +3, +5 — Group VA elements show these common oxidation states. Elements of Group VA (Group 15) have five valence electrons. They commonly show oxidation states −3 (by gaining three electrons) and +3, +5 (by losing three or five electrons), depending on the reacting species.

12. Which of the following s-block element forms superoxide when burned in air?

a

K

Right

b

Li

Wrong

c

Na

Wrong

d

Mg

Right

✅ Correct Answer: (a) K — Potassium forms KO₂ (superoxide). Among s-block elements, potassium reacts with oxygen in air to form a superoxide (KO₂) because its large K⁺ ion stabilizes O₂⁻ effectively. Lithium forms oxide (Li₂O), sodium mainly forms peroxide (Na₂O₂), while magnesium forms MgO.

13. In the equilibrium of dichromate–chromate ion the colour of CrO₄²⁻ is:

a

Green

Wrong

b

Yellow

Right

c

Orange

Wrong

d

Red

Wrong

✅ Correct Answer: (b) Yellow — Chromate ions (CrO₄²⁻) are yellow. In the dichromate–chromate equilibrium, the chromate ion (CrO₄²⁻) has a yellow colour, while the dichromate ion (Cr₂O₇²⁻) is orange. Equilibrium reaction:2 CrO₄²⁻ +2H⁺ ⇌ Cr₂O₇²⁻) + H₂O. Basic medium → chromate (yellow). Acidic medium → dichromate (orange).

14. How many optical isomers are possible for HOOC–CH(OH)–CH(Br)–COOH:

a

5

Wrong

b

2

Wrong

c

3

Wrong

d

4

Right

✅ Correct Answer: (d) 4 — Two chiral centers → 2² = 4 optical isomers. Chiral center is a carbon atom attached to four different groups. C2: –COOH, –H, –OH, –CH(Br)–COOH → chiral. C3: –H, –Br, –CH(OH)–COOH, –COOH → chiral. So, there are 2 chiral centers. Number of optical isomers = 2ⁿ (where n = number of chiral centers)2² = 4

15. Which of the following pairs of compounds represent functional group isomerism ?

a

1-butene and 2-butene

Wrong

b

Ethanol and dimethyl ether

Right

c

n-butane and iso-butane

Wrong

d

Diethyl ketone and methyl propyl ketone

Wrong

✅ Correct Answer: (b) Ethanol & dimethyl ether — Same formula, different functional groups.

16. Benzene burns with smoky flame because of its:

a

High resonance energy

Wrong

b

Inflammability

Wrong

c

Aromaticity

Wrong

d

High carbon %

Right

✅ Correct Answer: (d) High carbon % — Benzene’s high C:H ratio causes smoky flame.

17. The kinetics of elimination bimolecular reaction is:

a

Zero order

Wrong

b

First order

Wrong

c

Third order

Wrong

d

Second order

Right

✅ Correct Answer: (d) Second order — E₂ elimination follows bimolecular kinetics.

18. Clemmensen reduction is the conversion of aldehydes and ketones into:

a

Alkanes

Right

b

Alkenes

Wrong

c

Alkyl halides

Wrong

d

Alcohols

Wrong

✅ Correct Answer: (a) Alkanes — Clemmensen reduction converts carbonyls to alkanes.

19. Formic acid is naturally found in:

a

Bee’s sting

Right

b

Valerian root

Wrong

c

Vinegar

Wrong

d

Butter

Wrong

✅ Correct Answer: (a) Bee’s sting — Formic acid occurs naturally in ants/bees.

20. An example of quaternary structure of protein is:

a

Myoglobin

Wrong

b

Albumin

Wrong

c

Hemoglobin

Right

d

Globulin

Wrong

✅ Correct Answer: (c) Hemoglobin — Quaternary structure with multiple polypeptide chains.

21. An example of thermosetting plastic is:

a

Polyethene

Wrong

b

PVC

Wrong

c

Bakelite

Right

d

Nylon

Wrong

✅ Correct Answer: (c) Bakelite — Classic First Synthetic thermosetting plastic.

22. The region of sphere which extends from 11 km to 50 km from Earth is known as:

a

Troposphere

Wrong

b

Mesosphere

Wrong

c

Stratosphere

Right

d

Thermosphere

Wrong

✅ Correct Answer: (c) Stratosphere — Lies between 11–50 km altitude.

23. Infrared spectroscopy is a technique used to determine:

a

Double and triple bonds

Wrong

b

Mass-to-charge ratio

Wrong

c

Functional group

Right

d

Conjugated system

Wrong

✅ Correct Answer: (c) Functional groups — IR spectroscopy identifies functional groups by absorption bands.

24. Melting & boiling points of which group decrease regularly down the group?

a

Group VIIIA

Wrong

b

Group VIIA

Wrong

c

Group IIIA

Wrong

d

Group IA

Right

✅ Correct Answer: (d) Group IA → Alkali metals show decreasing melting & boiling points due to weaker metallic bonding.

25. Chemical used in fireworks?

a

Sodium bicarbonate

Wrong

b

Bleaching powder

Wrong

c

Potassium nitrate

Right

d

Potash alum

Wrong

✅ Correct Answer: (c) Potassium nitrate → Used in gunpowder & fireworks as oxidizer.

26. Flame colour of which alkali metal is yellow?

a

K

Wrong

b

Rb

Wrong

c

Cs

Wrong

d

Na

Right

✅ Correct Answer: (d) Na → Sodium imparts a bright yellow colour in flame test.

27. Oil of vitriol refers to:

a

Sulphuric Acid

Right

b

Borax

Wrong

c

Alum

Wrong

d

Caustic soda

Wrong

✅ Correct Answer: (a) Sulphuric Acid → Oil of vitriol is the old name for H₂SO₄.

28. An example of a bidentate ligand among the following is:

a

K

Wrong

b

C₂O₄²⁻

Right

c

CO₃²⁻

Wrong

d

CN⁻

Wrong

✅ Correct Answer: (b) Oxalate (C₂O₄²⁻) has two donor oxygens and chelates the metal (bidentate). Carbonate ion (CO₃²⁻) is trigonal planar, with three oxygen atoms. Each oxygen has lone pairs that can act as donor sites. Typically, carbonate coordinates through one oxygen atom (monodentate). However, it can bind through two oxygen atoms in some complexes → acting as bidentate.

29. A highly paramagnetic ion among the following is

a

Fe³⁺

Right

b

Fe²⁺

Wrong

c

Co²⁺

Wrong

d

Cr³⁺

Wrong

✅ Correct Answer: (a) Fe³⁺ → Fe³⁺ (high spin d⁵) has five unpaired electrons, making it strongly paramagnetic.

30. The highest oxidation state of chromium is:

a

+6

Right

b

+5

Wrong

c

+4

Wrong

d

+7

Wrong

✅ Correct Answer: (a) +6 → Chromium reaches its highest oxidation of +6 (equal to its group number VIB) in compounds like CrO₃ and chromates/dichromates.

31. 5d series of outer transition elements is

a

Sc to Zn

Wrong

b

La to Hg

Right

c

Y to Cd

Wrong

d

Ac to Cn

Wrong

✅ Correct Answer: (b) La to Hg → The 5d transition series is conventionally listed as La to Hg in outer transition elements classification.

32. Oxidation of manganese in air gives the following oxide:

a

MnO

Wrong

b

MnO₂

Wrong

c

Mn₃O₄

Right

d

Mn₂O₃

Wrong

✅ Correct Answer: (c) Mn₃O₄→ Manganese oxidizes in air to mixed oxide Mn₃O₄ under typical conditions.

33. Which of the following functional group contains a nitrogen atom?

a

Imines

Wrong

b

Amide

Wrong

c

diazonium

Wrong

d

All

Right

✅ Correct Answer: (d) All → (a) Imines: Imines contain a nitrogen atom, typically bonded to a carbon atom double-bonded to another group (like an alkyl or aryl group). (b) Amide: Amides also contain a nitrogen atom, where the nitrogen is attached to a carbonyl group (C=O). (c) Diazonium: Diazonium compounds contain a nitrogen atom, specifically a nitrogen group (-N₂⁺) attached to a carbon atom. So the answer would be all of the above: (a), (b), and (c) all contain nitrogen atoms.

34. The general formula of the homologous series of alcohol is

a

CₙH₂ₙO

Wrong

b

CₙH₂ₙ₋₂O

Wrong

c

CₙH₂ₙ₊₁O

Wrong

d

CₙH₂ₙ₊₂O

Right

✅ Correct Answer: (d) CₙH₂ₙ₊₂O → general formula for alcohols.

35. The number of five-membered and six-membered rings in C₆₀ Bucky ball are respectively

a

20 and 12

Wrong

b

12 and 12

Wrong

c

5 and 32

Wrong

d

12 and 20

Right

✅ Correct Answer: (d) 12 and 20→ 12 five-membered + 20 six-membered rings form the C₆₀ buckyball. The buckyball (C₆₀) mimics a soccer ball pattern: 12 pentagons + 20 hexagons (32 rings total). That’s why the answer is 12 five membered rings and 20 six membered rings.

36. Which of the following molecules possess acyl functional group?

a

R–CONH₂

Wrong

b

R–COO–CH₃

Wrong

c

R–CO–X

Right

d

R–CO–R

Wrong

✅ Correct Answer: (c) R–CO–X → Acyl group is R–CO–X (X = halogen/other substituent).

37. Resorcinol is a phenol, it contains two –OH groups at:

a

Position 1 and 2

Wrong

b

Position 2 and 4

Wrong

c

Position 1 and 3

Right

d

Position 1 and 4

Wrong

✅ Correct Answer: (c) Position 1 and 3 → Resorcinol has –OH at positions 1 and 3 on benzene ring.

38. A hydrocarbon with the molecular formula C₇H₁₂ is possibly

a

Heptene

Wrong

b

Heptyne

Wrong

c

Heptadiene

Wrong

d

Both b and c

Right

✅ Correct Answer: (d) Both b and c → C₇H₁₂ fits formula for alkyne and alkadiene (CₙH₂ₙ₋₂), hence both alkyne and heptadiene and hence both b and c are correct. Both (b) Heptyne and (c) Heptadiene are possible hydrocarbons with formula C₇H₁₂. If the exam is single answer type, the key usually expects heptyne. If it’s multiple answer type, then both are correct.

39. An organic compound with formula CH₃CH=CH–C≡CH, correct IUPAC name is

a

1-pentyne-3-ene

Wrong

b

3-pentene-1-pentyne

Wrong

c

2-penten-3-yne

Wrong

d

3-penten-1-yne

Right

✅ Correct Answer: (d) 3-penten-1-yne → Double bond at C3 and triple bond at C1 → 3-penten-1-yne (from alkenyne).

40. IUPAC name of isopropyl alcohol is:

a

1-propanol

Wrong

b

1-butanol

Wrong

c

2-propanol

Right

d

2-butanol

Wrong

✅ Correct Answer: (c) 2-propanol → Isopropyl alcohol is IUPAC 2-propanol. isopropyl alcohol has the Structure: CH₃–CHOH–CH₃. It’s a three carbon chain (propane) with an –OH group on the second carbon. Parent chain: propane. –OH group at carbon 2 → 2 propanol.

Final Score