List of top Chemistry Questions

Which among the following statements is true for haloalkyne?
The pH of a solution is 3. What is the concentration of hydrogen ions in this solution?
Consider the following
Assertion (A): phosphorus can form both phosphorus (III) and phosphorus (V) chlorides but nitrogen cannot form nitrogen(V) chloride.
Reason (R): The electronegativity of nitrogen is more than that of phosphorus
The correct answer is
The magnetic moment of \( \text{Mn}^{3+} \) is:
0.3 g of acetic acid (Molar mass = 60 g mol\(^{-1}\)) dissolved in 30 g of benzene shows a depression in freezing point equal to 0.45°C. Calculate the percentage association of acid if it forms a dimer in the solution.
(Given: \( K_f \) for benzene = 5.12 K kg mol\(^{-1}\))
The rate constant for the hydrolysis of sucrose by an enzyme at $300\,K$ is $k_1$ and at $320\,K$ is $1.25k_1$. The activation energy is (in kJ mol$^{-1}$):
Which of the following is Hinsberg's reagent?
The order of reactivity of the following compounds towards SN2 displacement reaction is (i) \(C_{6}H_{5}CH(CH_{3})Br\) (ii) \(C_{6}H_{5}CH(C_{6}H_{5})Br\) (iii) \(C_{6}H_{5}C(CH_{3})(C_{6}H_{5})Br\) (iv) \(C_{6}H_{5}CH_{2}Br\)
The major product obtained in the dehydration of ethanol in the presence of \(H_{2}SO_{4}\) at 413 K is
\(CH_3 - CH_2 - CH(CH_3) - CH(CH_3) - ONa + C_2H_5Br \rightarrow\)
Which of the following compound has the highest boiling point?
Which of the following acid is highly acidic?
Bromoethane on treatment with sodium metal in dry ethereal solution gives
The IUPAC name of \([Co(en)_3]_2(SO_4)_3\) is
Which of the following pair of actinoids exhibit maximum oxidation state of \(+7?\)
The IUPAC name of the compound \(HOCH_2(CH_2)_3CH_2COCH_3\) is
Which of the following is an electron donating group?
Chromite ore is
The magnetic moment of a divalent ion in aqueous solution is 3.87 BM. The number of unpaired electrons present in it is
Which of the following transition metal does not exhibit variable oxidation state?
What is the half life period of the first order reaction whose rate constant is \(2.31 \times 10^{- 1} \mathrm{~s}^{- 1}\)
In the Arrhenius equation, \(k = Ae^{- Ea / RT}\), which factor corresponds to the fraction of molecules that have kinetic energy greater than activation energy ?
Which of the following solutions of salts are neutral?
(i) KBr (ii) \(NaNO_{2}\) (iii) KF (iv) \(NH_{4}NO_{3}\) (v) NaCl
The molar conductivity \((\Lambda_{m})\) acetic acid is \(78.1 \text{S cm}^{2} \text{mol}^{-1}\) . Its degree of dissociation \((\alpha)\) is \((\Lambda_{m}^{0})\) for acetic acid= 390.5 S \(cm^{2} \text{mol}^{-1}\)
In which of the following solutions X- Y interactions are weaker than X- X or Y- Y interactions? (Where, X and Y are pure components)