List of top Chemistry Questions

Which of the following ions are isoelectronic?
Which of the following statements are incorrect about boundary surface diagram of orbital?} (i) A boundary surface is drawn in space for an orbital on which the value of probability density $|\Psi|^2$ is constant.} (ii) The boundary surface for $|\Psi|^2$ and $|\Psi|$ are not identical.} (iii) The density of the dots represents the probability density of finding the electron in the region.} (iv) In $1s$ and $2s$ orbitals, the probability of finding electron at a given distance is not equal in all the directions.} (v) The $2p$ orbitals in the boundary surface diagram are not spherical.
The mass of sodium acetate required to prepare $250$ mL of $0.4$ M aqueous solution is \ (Molar mass of sodium acetate = $82$ g mol$^{-1}$)
What is the oxidation state of Chlorine in \(Cl_2O_7\)?
Pyridinium chlorochromate is a complex of
IUPAC name of $CH_3-CH(OH)-CH_2-CH(OH)-CH(C_2H_5)-CH_2CH_3$ is
The increasing order of boiling point of the following amines is
Which of the following amines does not form carbylamine?
An organic compound with molecular formula $C_5H_{10}O$ does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogen sulphite and gives positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acids. The compound is:
The reagent used for the conversion of decanol into decanoic acid is
In Swarts reaction, Freon-12 is manufactured from
Which of the following are carcinogenic hydrocarbons? (i) 1,2-Benzanthracene
(ii) Pent-1-yne
(iii) 1,2-Benzpyrene
(iv) Cyclohexane
(v) 3-Methylcholanthrene
In chemotherapy, the ligand used to remove the excess of copper is
IUPAC name of $(CH_3)_3C-CH_2Br$ is
In Carius method, $0.40\,g$ of an organic compound gave $0.188\,g$ of $AgBr$. The percentage of bromine in the compound is (Atomic mass of Ag = 108 g mol$^{-1}$ and Br = 80 g mol$^{-1}$)
Which of the following statements are true about electronegativity? (i) Electronegativity generally increases across a period and decreases down a group.
(ii) The electronegativity of a given element is constant.
(iii) The electronegativity values decrease with the increase in atomic radii.
(iv) Electronegativity is directly related to the metallic property of the elements.
(v) Electronegativity is inversely related to the non-metallic property of the elements.
Some transition metal ions given below contain spin only magnetic moment (BM). Which of the following is not correctly matched?
What is the mass of ethanoic acid required to prepare $0.5\,m$ solution containing $100\,g$ of water? (Molar mass of ethanoic acid = $60\,g\,mol^{-1}$)
The enthalpy of combustion of benzene, graphite and dihydrogen at $298\,K$ are $-3260$, $-390$ and $-290\,kJ\,mol^{-1}$ respectively. Enthalpy of formation of benzene is:
Which of the following reactions are complex reactions? (i) Oxidation of ethane
(ii) Thermal decomposition of HI on gold surface
(iii) Saponification of methyl acetate
(iv) Nitration of phenol
(v) Decomposition of $NH_3$ on hot Pt surface
Which of the following transition metal has more than one metallic structure at normal temperature?
In a first order reaction, $N_2O_5(g) \rightarrow 2NO_2(g) + \frac{1}{2}O_2(g)$, the initial concentration of $N_2O_5$ was $1.6 \times 10^{-3} mol\,lit^{-1}$ at $300\,K$. The concentration of $N_2O_5$ after 23 minutes was $0.8 \times 10^{-3} mol\,lit^{-1}$. ($\log 2 = 0.3010$). Find the rate constant.
What is the emf of the cell at $298\,K$ in which the following reaction takes place? \[ Ni(s) + 2Ag^+(0.002M) \rightarrow Ni^{2+}(0.04M) + 2Ag(s) \] ($E^\circ_{cell} = 1.05V$)
Which of the following metals are normally used in the preparation of dihydrogen in the laboratory?
The concentration of hydrogen ions in a hydrochloric acid solution is $3 \times 10^{-3}M$. Its pH value is about ($\log 3 = 0.4771$)