List of top Chemistry Questions

For which one of the following reactions will there be a positive $\Delta S$ ?
Reaction of methyl bromide with aqueous sodium hydroxide involves
The correct IUPAC name of $K_2[Ni(CN)_4]$ is _______
The amount of heat evolved when $500 \,cm^3$ of $0.1 \,M \,HCl$ is mixed with $200\, cm^3$ of $0.2\,M \,NaOH$ is _______
The empirical formula of a non-electrolyte is $CH_2O$. A solution containing $6 \,g$ of the compound exerts the same osmotic pressure as that of $0.05\, M$ glucose solution at the same temperature. The molecular formula of the compound is
The spin only magnetic moment of $Mn^{+4}$ ion is nearly____
The set of quantum numbers for the outermost electron for copper in its ground state is ___________
$P_4O_{10}$ is the anhydride of
How many gram-equivalents of $ NaOH $ are required to neutralise $ 25 \,cm^3 $ of a decinormal $ HCl $ solution?
The orbital frequency of an electron in the hydrogen atom is proportional to
Keto-enol tautomerism is not observed in
The molecule which has zero dipole moment is
Treatment of acetaldehyde with ethyl magnesium bromide and subsequent hydrolysis gives
Which is not an example of common ion effect?
Among the following, the formula of saturated fatty acid is
The correct order of dehydration of alcohols is
The units of rate constant for first order reaction are
Peroxide ion ___________ a) is diamagnetic b) has five completely filled antibonding molecular orbitals c) is isoelectronic with neon d) has bond order one. Which one of these is correct?
The rate constant for a first order reaction is $60 \,s^{-1}$. How much time it will take to reduce the concentration of the reactant to $1 / 10^\text{ th}$ of its initial value?
The equivalent weight of $H _{3} PO _{2}$, when it disproportionates into $PH _{3}$ and $H _{3} PO _{3}$ is
Oxidation state of $Fe$ in $Fe ( CO )_{5}$ is zero. $EAN$ of $Fe$ in this complex is $36$.
$CO+ H_2\xrightarrow[X(catalyst)]{300^\circ C/300\, atm} CH_3OH$ The catalyst $X$ is
Ionisation energy of $He^+$ is $19.6 \times 10^{-18}\, J\, atom^{-1}$. The energy of the first stationary state $(n = 1)$ of $Li^{2+}$ is
The potential of a hydrogen electrode at $pH = 10$ is
Which of the following is an outer orbital complex ?