KCET 2025 April 16 Chemistry Question Paper (Available): Download Question Paper with Answers PDF

KCET 2025 Chemistry Questions with Solutions

Question 1:

In the reaction between hydrogen sulphide and acidified permanganate solution,

• (1) \( H_2S is oxidised to SO_2, MnO_4^- is reduced to MnO_2 \)
• (2) \( H_2S is reduced to SO_2, MnO_4^- is oxidised to Mn^{2+} \)
• (3) \( H_2S is oxidised to S, MnO_4^- is reduced to Mn^{2+} \)
• (4) \( H_2S is reduced to S, MnO_4^- is oxidised to Mn^{2+} \)

A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is

• (1) Europium
• (2) Erbium
• (3) Cerium
• (4) Samarium

In which of the following pairs, both the elements do not have (n-1)d^{10}ns^2 configuration?

• (1) Zn, Cd
• (2) Cd, Hg
• (3) Ag, Cu
• (4) Cu, Zn

A ligand which has two different donor atoms and either of the two ligates with the central metal atom/ion in the complex is called

• (1) Unidentate ligand
• (2) Polydentate ligand
• (3) Ambidentate ligand
• (4) Chelate ligand

Which of the following statements are true about \( [NiCl_4]^{2-} \)?

(a) The complex has tetrahedral geometry.

(b) Co-ordination number of Ni is 2 and oxidation state is +4.

(c) The complex is sp\(^3\) hybridised.

(d) It is a high spin complex.

(e) The complex is paramagnetic.

• (1) a, b, d and e
• (2) b, c, and d
• (3) a, b, c and d
• (4) a, c, d and e

Which formula and its name combination is incorrect?

• (1) \([CoCl_2(en)_2]Cl\), Dichloridobis (ethane-1, 2-diamine) cobalt(III) chloride
• (2) \([Co(NH_3)_5(CO_3)]Cl\), Pentaamine carbonylcobalt (III) chloride
• (3) \([Pt(NH_3)_2Cl(NO_2)]\), Diamine chloridonitrito-N-platinum(II)
• (4) \( K_3[Cr(C_2O_4)_3] \), Potassium trioxalatochromate(III)

In the complex ion \( [Fe(C_2O_4)_3]^{3-} \), the co-ordination number of Fe is

• (1) 5
• (2) 6
• (3) 3
• (4) 4

Match List-I with List-II for the following reaction pattern: \[ Glucose \quad Reagent \quad \rightarrow \quad Product \quad \rightarrow \quad Structural prediction \]

The correct sequence of \(\alpha\)-amino acid, hormone, vitamin, carbohydrates respectively is

• (1) Glutamine, Insulin, Aspartic acid, Fructose
• (2) Arginine, Testosterone, Glutamic acid, Maltose
• (3) Aspartic acid, Insulin, Ascorbic acid, rhamnose
• (4) Thiamine, Thyroxine, Vitamin A, Glucose

Which examples of carbohydrates exhibit \(\alpha\)-link (\(\alpha\)-glycosidic link) in their structure?

• (1) Amylose and Amylopectin
• (2) Cellulose and Glycogen
• (3) Glucose and Fructose
• (4) Maltose and Lactose

In the titration of potassium permanganate (KMnO\(_4\)) against Ferrous ammonium sulphate (FAS) solution, dilute sulphuric acid but not nitric acid is used to maintain acidic medium, because

• (1) Nitric acid doesn’t act as an indicator
• (2) Nitric acid itself is an oxidising agent
• (3) Nitric acid is a weak acid than sulphuric acid
• (4) It is difficult to identify the end point

The group reagent NH\(_4\)Cl (s) and aqueous NH\(_3\), will precipitate which of the following ion

• (1) Al\(^{3+}\)
• (2) Ba\(^{2+}\)
• (3) Ca\(^{2+}\)
• (4) NH\(_4^{+}\)

In the preparation of sodium fusion extract, the purpose of fusing organic compound with a piece of sodium metal is to

• (1) Convert the elements of the compound from covalent form to ionic form
• (2) Convert the elements of the compound from ionic form to covalent form
• (3) Decrease the melting point of the compound
• (4) Convert the organic compound into vapour state

The sodium fusion extract is boiled with concentrated nitric acid while testing for halogens. By doing so, it

• (1) increases the solubility of AgCl
• (2) increases the concentration of NO\(_3^{-}\) ion
• (3) decomposes Na\(_2\)S and NaCN, if formed
• (4) helps in precipitation of AgCl

Which of the following is not an aromatic compound?

The IUPAC name of the given organic compound is HC \( \equiv \) C - CH = CH - CH\(_2\).

• (1) Hexa - 5-yn-1,3-diene
• (2) Hexa-1,3-dien-5-yne
• (3) Hexa - 3,5-dien-1-yne
• (4) Hexa-1-yn-3,5-diene

Among the following, identify the compound that is not an isomer of hexane:

The organic compound can be classified as

• (1) Benzyl halide
• (2) Aryl halide
• (3) Alkyl halide
• (4) Allylic halide

Chlorobenzene reacts with bromine gas in the presence of Anhydrous AlBr_3 to yield p-Bromochlorobenzene. This reaction is classified as _____ .

• (1) Nucleophilic substitution reaction
• (2) Electrophilic substitution reaction
• (3) Addition reaction
• (4) Elimination reaction

The organometallic compound
(CH_3)_3CMgBr on reaction with D_2O produces

• (1) (CD₃)₃CD
• (2) (CD₃)₃COD
• (3) (CH₃)₃CD
• (4) (CH₃)₃COD

The major product formed when 1 - Bromo-3-Chlorocyclobutane reacts with metallic sodium in dry ether is

Ethyl alcohol is heated with concentrated sulphuric acid at 413 K (140°C). The major product formed is

• (1) CH₃ - O - C₃H₇
• (2) CH₂ = CH₂
• (3) CH₃COOC₂H₅
• (4) C₂H₅ - O - C₂H₅

Phenol can be distinguished from propanol by using the reagent

• (1) Iron metal
• (2) Iodine in alcohol
• (3) Sodium metal
• (4) Bromine water

Match the following with their pKa values

Question 25:

Oxidation of Toluene with chromyl chloride followed by hydrolysis gives Benzaldehyde. This reaction is known as

• (1) Kolbe reaction
• (2) Stephen reaction
• (3) Cannizzaro Reaction
• (4) Etard Reaction

Statement-I: Reduction of ester by DIBAL-H followed by hydrolysis gives aldehyde.

Statement-II: Oxidation of benzyl alcohol with aqueous KMnO₄ leads to the formation of benzaldehyde.

Among the above statements, identify the correct statement.

• (1) Statement-I is true but statement-II is false
• (2) Statement-I is false but statement-II is true
• (3) Both statements-I and II are true
• (4) Both statements-I and II are false

Arrange the following compounds in their decreasing order of reactivity towards nucleophilic addition reaction.

• (1) CH₃COCH₃, CH₃CO₂CH₅, CH₃CHO
• (2) CH₃CO₂CH₅ > CH₃COCH₃ > CH₃CHO
• (3) CH₃CHO > CH₃CO₂CH₅ > CH₃COCH₃
• (4) CH₃CHO > CH₃COCH₃ > CH₃CO₂CH₅

Which of the following has the most acidic Hydrogen?

• (1) Dichloroacetic acid
• (2) Trichloroacetic acid
• (3) Chloroacetic acid
• (4) Propanoic acid

Which of the following reagents are suitable to differentiate Aniline and N-methylaniline chemically?

• (1) Br₂ water
• (2) Conc. Hydrochloric acid and anhydrous zinc chloride
• (3) Chloroform and Alcoholic potassium hydroxide
• (4) Acetic anhydride

Which of the following reaction/s does not yield an amine?

• (I) R - X + NH₃ \(\xrightarrow{alc}\)

Match the compounds given in List-I with the items given in List-II

The number of orbitals associated with 'N' shell of an atom is

• (1) 32
• (2) 3
• (3) 4
• (4) 16

According to the Heisenberg's Uncertainty principle, the value of \(\Delta v \cdot \Delta x\) for an object whose mass is \(10^{-6}\) kg is

• (1) \(4.0 \times 10^{-26} \, ms^{-1}\)
• (2) \(3.5 \times 10^{-25} \, ms^{-1}\)
• (3) \(5.2 \times 10^{-29} \, ms^{-1}\)
• (4) \(3.0 \times 10^{-24} \, ms^{-1}\)

Given below are two statements.

• (1) Statement-I is true but Statement-II is false.
• (2) Statement-I is false but Statement-II is true.
• (3) Both Statement-I and Statement-II are true.
• (4) Both Statement-I and Statement-II are false.

Which one of the following reactions has
\(\Delta H = \Delta U\)?

• (1) \( C_6H_6 (l) + \frac{15}{2} O_2 (g) \to 6CO_2 (g) + 3H_2O (l) \)
• (2) \( 2HI (g) \to H_2 (g) + I_2 (g) \)
• (3) \( N_2 (g) + 3H_2 (g) \to 2NH_3 (g) \)
• (4) \( CaCO_3 (s) \to CaO (s) + CO_2 (g) \)

Identify the incorrect statements among the following:

• (a) All enthalpies of fusion are positive.
• (b) The magnitude of enthalpy change does not depend on the strength of the intermolecular interactions in the substance undergoing phase transformations.
• (c) When a chemical reaction is reversed, the value of \( \Delta H^\circ \) is reversed in sign.
• (d) The change in enthalpy is dependent on the path between initial state (reactants) and final state (products).

Which of the following statements is/are true about equilibrium?

• (a) Equilibrium is possible only in a closed system at a given temperature
• (b) All the measurable properties of the system remain constant at equilibrium.
• (c) Equilibrium constant for the reverse reaction is the inverse of the equilibrium constant for the reaction in the forward direction.

According to Le Chatelier's principle, in the reaction CO(g) + 3H_2(g) \rightleftharpoons CH_4(g) + H_2O(g), the formation of methane is favoured by

• (a) increasing the concentration of CO
• (b) increasing the concentration of H_2O
• (c) decreasing the concentration of CH_4
• (d) decreasing the concentration of H_2

The equilibrium constant at 298 K for the reaction \( A + B \rightleftharpoons C + D \) is 100. If the initial concentrations of all the four species were 1 M each, then equilibrium concentration of D (in mol/L) will be

• (1) 1.818
• (2) 1.182
• (3) 0.818
• (4) 0.182

Among the following 0.1 m aqueous solutions, which one will exhibit the lowest boiling point elevation, assuming complete ionization of the compounds in solution?

• (1) Aluminium sulphate
• (2) Potassium sulphate
• (3) Sodium chloride
• (4) Aluminium chloride

Variation of solubility with temperature \(T\) for a gas in liquid is shown by the following graphs. The correct representation is

180 g of glucose, \(C_6H_{12}O_6\), is dissolved in 1 kg of water in a vessel. The temperature at which water boils at 1.013 bar is ______ (given, \(K_b\) for water is 0.52 K kg mol\(^{-1}\)). Boiling point for pure water is 373.15 K

• (1) 373.15 K
• (2) 373.0 K
• (3) 373.202 K
• (4) 373.67 K

If \(N_2\) gas is bubbled through water at 293 K, how many moles of \(N_2\) gas would dissolve in 1 litre of water? Assume that \(N_2\) exerts a partial pressure of 0.987 bar. [Given \(K_H\) for \(N_2\) at 293 K is 76.48 K bar]

• (1) \(7.16 \times 10^{-5}\)
• (2) \(7.16 \times 10^{-4}\)
• (3) \(7.16 \times 10^{-3}\)
• (4) \(0.716 \times 10^{-3}\)

The correct statement/s about Galvanic cell is/are:

(a) Current flows from cathode to anode

(b) Anode is positive terminal

(c) If \(E_{cell} < 0\), then it is spontaneous reaction

(d) Cathode is positive terminal

• (1) a, b, and c
• (2) a, b, and c
• (3) a, b, and c
• (4) a and b only

The electronic conductance depends on:

• (1) The number of valence electrons per atom
• (2) Concentration of the electrolyte
• (3) Size of the ions
• (4) Nature of electrolyte added

For a given half cell, \( Al^{3+} + 3e^- \rightarrow Al \) on increasing the concentration of aluminium ion, the electrode potential will

• (1) No change
• (2) First increase then decrease
• (3) Increase
• (4) Decrease

Match the following and select the correct option for the quantity of electricity, in Cmol\(^{-1}\), required to deposit various metals at the cathode.

• (1) a) \( Ag^+ \), ii) 386000 Cmol\(^{-1}\)
• (2) b) \( Mg^{2+} \), iii) 289500 Cmol\(^{-1}\)
• (3) c) \( Al^{3+} \), iv) 96500 Cmol\(^{-1}\)
• (4) d) \( Ti^{4+} \), i) 193000 Cmol\(^{-1}\)

Catalysts are used to increase the rate of a chemical reaction. Because it

• (1) Decrease the activation energy of the reaction
• (2) Brings about improper orientation of reactant molecules
• (3) Increases the potential energy barrier
• (4) Increases the activation energy of the reaction

Half-life of a first order reaction is 20 seconds and initial concentration of reactant is 0.2M. The concentration of reactant left after 80 seconds is

• (1) 0.5 M
• (2) 0.0125 M
• (3) 0.2 M
• (4) 0.1 M

In the given graph, \( E_a \) for the reverse reaction will be

• (1) 215 KJ
• (2) 90 KJ
• (3) 305 KJ
• (4) 125 KJ

For the reaction \( 2N_2O_5 \rightarrow 4NO_2 (g) + O_2 (g) \), the initial concentration of \( N_2O_5 \) is 2.0 mol L\(^{-1}\), and after 300 minutes, it is reduced to 1.4 mol L\(^{-1}\). The rate of production of \( NO_2 \) (in mol L\(^{-1}\) min\(^{-1}\)) is

• (1) \( 4 \times 10^{-4} \)
• (2) \( 2.5 \times 10^{-3} \)
• (3) \( 4 \times 10^{-3} \)
• (4) \( 2.5 \times 10^{-4} \)

Which of the following methods of expressing concentration are unitless?

• (1) Molality and Mole fraction
• (2) Mass percent (W/W) and Molality
• (3) Molality and Molality
• (4) Mole fraction and Mass percent (W/W)

Select the INCORRECT statement/s from the following:

• (a) 22 books have infinite significant figures.
• (b) In the answer of calculation \( 2.5 \times 1.25 \) has four significant figures.
• (c) Zero's preceding to first non-zero digit are significant.
• (d) In the answer of calculation \( 12.11 + 18.0 + 1.012 \) has three significant figures.

Given below are the atomic masses of the
elements:




Which of the following doesn't form triad?

The change in hybridisation (if any) of the 'Al' atom in the following reaction is

Match List-I with List-II and select the correct option:

The electronic configuration of X and Y are given below:

Which of the following is the correct molecular formula and type of bond formed between X and Y?

Match List-I with List-II and choose the correct answer from the options given below.

In the following pairs, the one in which both transition metal ions are colourless is