List of top Chemistry Questions asked in KCET

Which of the following pairs has both the ions coloured in aqueous solution? [Atomic numbers of Sc = 21, Ti = 22, Ni = 28, Cu = 29, Mn = 25]

A hydrocarbon A (C₄H₈) on reaction with HCl gives a compound B (C₄H₉Cl) which on reaction with 1 mol of NH₃ gives compound C (C₄H₁₀N). On reacting with NaNO₂ and HCl followed by treatment with water, compound C yields an optically active compound D. The D is

In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is

In Chrysoberyl, a compound containing Beryllium, Aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy \(\frac{1}{4}\)th of octahedral voids. The formula of the compound is

$K _{ u }$ values for acids $H _{2} SO _{3}, HNO _{2}, CH _{3} COOH$ and $HCN$ are respectively $1.3 \times 10^{-2}, 4 \times 10^{-4}, 1.8 \times 10^{-5}$ and $4 \times 10^{-10}$, which of the above acids produces stronger conjugate base in aqueous solution?

The reagent which can do the conversion $CH _{3} COOH \longrightarrow CH _{3}- CH _{2}- OH $ is

Which of the following does not represent property stated against it?

Permanent hardness cannot be removed by

The correct IUPAC name of

Which of the following is not true for oxidation?

Choose the correct statement

Which of the following is an incorrect statement?

in the reaction

MgBr+CH3NH2 Dry ether the number of possible isomers for the organic compound is 

A gas mixture contains $25\% \,He$ and $75\%\, CH_4$ by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately____

The pair of electrolytes that posses same value for the constant (A) in the Debye - Huckel - Onsagar equation, $\lambda_m = \lambda^0_m - A\sqrt{C}$ is

$0.4\, g$ of dihydrogen is made to react with $7.1 \,g$ of dichlorine to form hydrogen chloride. The volume of hydrogen formed at $273\,K$ and $1$ bar pressure is

The formal charge on central oxygen atom in ozone is

Given $E^0_{Fe^{+3}/Fe^{+2}} = +0.76V$ and $E^0_{I_2/I^-} = +0.55V.$ The equilibrium constant for the reaction taking place in galvanic cell consisting of above two electrodes is $\left[\frac{2.303RT}{F}=0.06\right]$

In which of the following cases a chemical reaction is possible ?

Solute ‘X’ dimerises in water to the extent of 80%.2.5g of ‘X’ in 100g of water increases the boiling point by 0.3∘C. The molar mass of ‘X’ is [K_b​=0.52Kkgmol⁻¹]

The carbonyl compound that does not undergo aldol condensation is

A metal exists as an oxide with formula $M_{0.96}O$. Metal $M$ can exist as $M^{2+}$ and $M^{3+}$ in its oxide $M_{0.96}O$. The percentage of $M^{3+}$ in the oxide is nearly

Give the IUPAC name of $[Pt(NH_3)_4]$ $[PtCl_4]$ is

For an elementary reaction $2A+3B \to 4C+D$ the rate of appearance of $C$ at time $?t?$ is $2.8\times10^{-3} \,mol \,L^{-1}S^{-1}$. Rate of disappearance of $B$ at ?$t$? will be

Identify the set of paramagnetic ions among the following: