KCET 2024 Chemistry Question Paper: Download Question Paper with Solution PDF

Which of the following set of polymers are used as fibre?

(i) Teflon
(ii) Starch
(iii) Terylene
(iv) Orlon

Choose the correct answer from the options given below:

(A) (i) and (ii)
(B) (ii) and (iii)
(C) (iii) and (iv)
(D) (i) and (iv)

The biodegradable polymer obtained by polymerisation of Glycine and Aminocaproic acid is:

(A) Nylon 6
(B) PHBV
(C) Nylon 2 – Nylon 6
(D) Nylon 6, 10

The compound is:

(A) Sucralose
(B) Aspartame
(C) Saccharin
(D) Alitame

Which one of the following is a cationic detergent?

(A) Cetyltrimethylammonium bromide
(B) Sodium dodecylbenzene sulphonate
(C) Dodecylbenzene sulphonic acid
(D) Dodecylbenzene

The type of linkage present between nucleotides is:

(A) Phosphoester linkage
(B) Phosphodiester linkage
(C) Amide linkage
(D) Glycosidic linkage

α-D-(+)-glucose and β-D-(+)-glucose are:

(A) Enantiomers
(B) Conformers
(C) Epimers
(D) Anomers

Propanone and Propanal are:

(A) Position isomers
(B) Functional isomers
(C) Chain isomers
(D) Geometrical isomers

Sodium ethanoate on heating with soda lime gives ‘X”. Electrolysis of aqueous solution of sodium ethanoate gives ‘Y”. ‘X' and 'Y' respectively are:

(A) Methane and Ethane
(B) Methane and Methane
(C) Ethane and Methane
(D) Ethane and Ethane

But-1-yne on reaction with dilute H₂SO₄ in the presence of Hg²⁺ ions at 333 K gives:

Biologically active adrenaline and ephedrine used to increase blood pressure contain:

(A) Primary amino group
(B) Secondary amino group
(C) Tertiary amino group
(D) Quaternary ammonium salt

In the reaction: Aniline ^{NaNO₂/dil.HCl}→ P ^{NaOH, Phenol}→ Q

(A) C₆H₅N₂Cl
(B) ortho-hydroxyazobenzene
(C) para-hydroxyazobenzene
(D) meta-hydroxyazobenzene

The female sex hormone which is responsible for the development of secondary female characteristics and participates in the control of the menstrual cycle is:

(A) Testosterone
(B) Estradiol
(C) Insulin
(D) Thyroxine

In the following scheme of reaction:
C₂H₅Cl → X (C₂H₅F)
C₂H₅Cl → Y (CH₂ = CH₂)
C₂H₅Cl → Z (C₄H₁₀)

X, Y, and Z respectively are:

(A) AgF, alcoholic KOH, and benzene
(B) HF, aqueous KOH, and Na in dry ether
(C) HgF₂, alcoholic KOH, and Na in dry ether
(D) CoF₂, aqueous KOH, and benzene

8.8 g of monohydric alcohol added to ethyl magnesium iodide in ether liberates 2240 cm³ of ethane at STP. This monohydric alcohol when oxidised using pyridinium-chlorochromate forms a carbonyl compound that answers the silver mirror test (Tollen's test). The monohydric alcohol is:

(A) butan-2-ol
(B) 2, 2-dimethyl propan-1-ol
(C) pentan-2-ol
(D) 2, 2-dimethyl ethan-1-ol

When a tertiary alcohol ‘A' (C₄H₁₀O) reacts with 20% H₃PO₄ at 358 K, it gives a compound 'B' (C₄H₈) as a major product. The IUPAC name of the compound ‘B' is:

(A) But-1-ene
(B) But-2-ene
(C) Cyclobutane
(D) 2-Methylpropene

PCC is:

(A) K₂Cr₂O₇ + Pyridine
(B) CrO₃ + CHCl₃
(C) CrO₃ + H₂SO₄
(D) A complex of chromium trioxide with pyridine + HCl

On treating 100 mL of 0.1 M aqueous solution of the complex CrCl₃.6H₂O with excess of AgNO₃, 2.86 g of AgCl was obtained. The complex is:

(A) [Cr(H₂O)₃Cl₃].3H₂O
(B) [Cr(H₂O)₄Cl₂]Cl.2H₂O
(C) [Cr(H₂O)₅Cl]Cl₂.H₂O
(D) [Cr(H₂O)₆]Cl₃

The complex compounds [Co(NH₃)₅SO₄]Br and [Co(NH₃)₅Br]SO₄ are:

(A) Coordination isomers
(B) Geometrical isomers
(C) Optical isomers
(D) Ionisation isomers

Which of the following statements are true about [CoF₆]³⁻ ion?

I The complex has octahedral geometry.
II Coordination number of Co is 3 and oxidation state is +6.
III The complex is sp³d² hybridised.
IV It is a high spin complex.

Choose the correct answer from the options given below:

(A) I, II, and IV
(B) I, III, and IV
(C) II and IV
(D) II, III, and IV

A haloalkane undergoes S_N2 or S_N1 reaction depending on:

(A) Solvent used in the reaction
(B) Low temperature
(C) The type of halogen atom
(D) Stability of the haloalkane

2-Methylpropane can be prepared by Wurtz reaction. The haloalkanes taken along with metallic sodium and dry ether are:

(A) Chloromethane and 2-chloropropane
(B) Chloroethane and chloromethane
(C) Chloroethane and 1-chloropropane
(D) Chloromethane and 1-chloropropane

In the analysis of III group basic radicals of salts, the purpose of adding NH₄Cl (solid) to NH₄OH is:

(A) to increase the concentration of OH⁻ ions.
(B) to precipitate the radicals of group IV and V.
(C) to suppress the dissociation of NH₄OH.
(D) to introduce Cl⁻ ions.

Solubility product of CaC₂O₄ at a given temperature in pure water is 4 × 10⁻⁹ mol²/L². Solubility of CaC₂O₄ at the same temperature is:

(A) 6.3 × 10⁻⁵ mol/L
(B) 2 × 10⁻⁵ mol/L
(C) 2 × 10⁻⁴ mol/L
(D) 6.3 × 10⁻⁴ mol/L

In the reaction between moist SO₂ and acidified permanganate solution:

(A) SO₂ is oxidised to SO₄²⁻, MnO₄⁻ is reduced to Mn²⁺.
(B) SO₂ is reduced to S, MnO₄⁻ is oxidised to MnO₄.
(C) SO₂ is oxidised to SO₃²⁻, MnO₄⁻ is reduced to MnO₂.
(D) SO₂ is reduced to H₂S, MnO₄⁻ is oxidised to MnO₄.

Which one of the following properties is generally not applicable to ionic hydrides?

(A) Non-volatile
(B) Non-conducting in solid state
(C) Crystalline
(D) Volatile

Which one of the following nitrates will decompose to give NO₂ on heating?

(A) NaNO₃
(B) KNO₃
(C) RbNO₃
(D) LiNO₃

Which of the following halides cannot be hydrolysed?

(A) CCl₄
(B) SiCl₄
(C) GeCl₄
(D) SnCl₄

0.48 g of an organic compound on complete combustion produced 0.22 g of CO₂. The percentage of C in the given organic compound is:

(A) 25
(B) 50
(C) 12.5
(D) 87.5

In the given sequence of reactions, identify ‘P”, ‘Q' and 'S' respectively: CH₂=CH₂ --^P--> CH₂-CH₂ --^Q--> CH=CH | | | Br Br Br CH₂=CH --Br --^S--> C₆H₆

(A) Br₂, Alc.KOH, NaOH, Al₂O₃
(B) HBr, Alc.KOH, CaC₂, KMnO₄
(C) HBr, Alc.KOH, NaNH₂, Red hot iron tube
(D) Br₂, Alc.KOH, NaNH₂, Red hot iron tube

The first chlorinated organic insecticide prepared is:

(A) Gammaxene
(B) Chloroform
(C) COCl₂
(D) DDT

Which of the following crystals has the unit cell such that a = b ≠ c and α = β = 90°, γ = 120°?

(A) Zinc blende
(B) Graphite
(C) Cinnabar
(D) Potassium dichromate

MnO exhibits:

(A) Ferrimagnetism
(B) Antiferromagnetism
(C) Ferromagnetism
(D) Paramagnetism

The number of atoms in 4.5 g of a face-centred cubic crystal with edge length 300 pm is: (Given: Density d = 3 g/cm³, Na = 6.022 × 10²³)

(A) 6.6 × 10²⁰
(B) 6.6 × 10²³
(C) 6.6 × 10¹⁹
(D) 6.6 × 10²²

Vapour pressure of a solution containing 18 g of glucose and 178.2 g of water at 100°C is: (Vapour pressure of pure water at 100°C = 760 torr)

(A) 76.0 torr
(B) 752.0 torr
(C) 7.6 torr
(D) 3207.6 torr

A mixture of phenol and aniline shows negative deviation from Raoult's law. This is due to the formation of:

(A) Polar covalent bond
(B) Non-polar covalent bond
(C) Intermolecular Hydrogen bond
(D) Intramolecular Hydrogen bond

Which one of the following pairs will show positive deviation from Raoult's Law?

(A) Water - HCl
(B) Benzene - Methanol
(C) Water - HNO₃
(D) Acetone - Chloroform

How many Coulombs are required to oxidize 0.1 mole of H₂O₂ to oxygen?

(A) 1.93 × 10⁵ C
(B) 1.93 × 10⁴ C
(C) 3.86 × 10⁴ C
(D) 9.65 × 10³ C

A current of 3 A is passed through a molten calcium salt for 1 hr 47 min 13 sec. The mass of calcium deposited is: (Molar mass of Ca = 40 g/mol)

(A) 6.0 g
(B) 2.0 g
(C) 8.0 g
(D) 4.0 g

The value of 'A' in the equation Λ_m = Λ^o_m - A√C is same for the pair:

(A) NaCl and CaCl₂
(B) CaCl₂ and MgSO₄
(C) NaCl and KBr
(D) MgCl₂ and NaCl

For the reaction A ⇌ B, E_a = 50 kJ/mol and ∆H = −20 kJ/mol. When a catalyst is added, E_a decreases by 10 kJ/mol. What is the E_a for the backward reaction in the presence of the catalyst?

(A) 60 kJ/mol
(B) 40 kJ/mol
(C) 70 kJ/mol
(D) 20 kJ/mol

For the reaction PCl₅ → PCl₃ + Cl₂, the rate and rate constant are 1.02 × 10⁻⁴ mol L⁻¹s⁻¹ and 3.4 × 10⁻⁵ s⁻¹, respectively, at a given instant. The molar concentration of PCl₅ at that instant is:

(A) 8.0 mol/L
(B) 3.0 mol/L
(C) 0.2 mol/L
(D) 2.0 mol/L

Which one of the following does not represent the Arrhenius equation?

(A) log k = log A - E_a / (2.303RT)
(B) k = Ae^-Ea/RT
(C) ln k = ln A - E_a / RT
(D) k = Ae^Ea/RT

Identify the incorrect statement:

(A) Values of colligative properties of colloidal solutions are of small order compared to values of true solutions.
(B) Tyndall effect is observed only when the diameter of the dispersed particles is not much smaller than the wavelength of incident light.
(C) Colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles.
(D) Brownian movement is due to balanced bombardment of molecules of the dispersion medium on colloidal particles.

For the coagulation of positively charged hydrated ferric-oxide sol, the flocculating power of the ions is in the order:

(A) PO₄³⁻ > SO₄²⁻ > Cl⁻ > [Fe(CN)₆]⁴⁻
(B) Cl⁻ > SO₄²⁻ > PO₄³⁻ > [Fe(CN)₆]⁴⁻
(C) SO₄²⁻ > Cl⁻ > PO₄³⁻ > [Fe(CN)₆]⁴⁻
(D) [Fe(CN)₆]⁴⁻ > PO₄³⁻ > SO₄²⁻ > Cl⁻

Gold sol is not a:

(A) Macromolecular colloid
(B) Lyophobic colloid
(C) Multimolecular colloid
(D) Negatively charged colloid

The incorrect statement about the Hall-Héroult process is:

(A) Carbon anode is oxidised to CO and CO₂.
(B) Na₃AlF₆ helps to decrease the melting point of the electrolyte.
(C) CaF₂ helps to increase the conductivity of the electrolyte.
(D) Oxidation state of oxygen changes in the overall cell reaction.

Select the correct statement:

(A) Roasting involves heating the ore in the absence of air.
(B) Calcination involves heating the ore above its melting point.
(C) Smelting involves heating the ore with a suitable reducing agent and flux below its melting point.
(D) Calcination of calcium carbonate is endothermic.

NO₂ gas is:

(A) Colourless, neutral
(B) Colourless, acidic
(C) Brown, acidic
(D) Brown, neutral

Identify the incorrect statement from the following:

(A) Oxides of nitrogen in the atmosphere can cause depletion of the ozone layer.
(B) Ozone absorbs the intense ultraviolet radiation of the Sun.
(C) Depletion of the ozone layer is because of its chemical reactions with chlorofluoroalkanes.
(D) Ozone absorbs infrared radiation.

The correct decreasing order of boiling points of hydrogen halides is:

(A) HF > HCl > HBr > HI
(B) HI > HBr > HCl > HF
(C) HF > HI > HBr > HCl
(D) HI > HF > HBr > HCl

The synthetically produced radioactive noble gas by the collision of ²⁴⁹₉₈Cf with ⁴⁸₂₀Ca is:

(A) Radon
(B) Radium
(C) Oganesson
(D) Xenon

The transition element (≈ 5%) present with lanthanoid metal in Misch metal is:

(A) Mg
(B) Fe
(C) Zn
(D) Co

Match the following: I. Zn²⁺ i. d⁶ configuration
II. Cu²⁺ ii. Colourless
III. Ni²⁺ iii. μ = 1.73 BM Codes:

(A) i, ii, iii
(B) ii, iii, i
(C) ii, i, iii
(D) i, iii, ii

Which of the following statements related to lanthanoids is incorrect?

(A) Lanthanoids are silvery white soft metals.
(B) Samarium shows +2 oxidation state.
(C) Ce⁴⁺ solutions are widely used as oxidising agents in titrimetric analysis.
(D) Colour of lanthanoid ions in solution is due to d-d transitions.

A metalloid is:

(A) Bi
(B) Sb
(C) P
(D) Se

A pair of isoelectronic species having a bond order of one is:

(A) N₂, CO
(B) N₂⁺, NO⁺
(C) O₂⁻, F₂
(D) CO, NO⁺

Identify the wrong relation for real gases:

(A) Z = V_real/V_ideal
(B) P_real = P_ideal + (an²/V²)
(C) V_real = V_ideal - nb
(D) (P + an²/V²) (V – b) = RT

From the diagram, ΔH for the reaction C → A is: (ΔH₁ = +10 J, A → 2B; ΔH₂ = +25 J, 2B → C)

(A) +35 J
(B) -15 J
(C) -35 J
(D) +15 J

For which one of the following mixtures is composition uniform throughout?

(A) Sand and water
(B) Grains and pulses with stone
(C) Mixture of oil and water
(D) Dilute aqueous solution of sugar

The energy associated with the first orbit of He⁺ is:

(A) 0 J
(B) -8.72 × 10⁻¹⁸ J
(C) −4.58 × 10⁻¹⁸ J
(D) -0.545 × 10⁻¹⁸ J