List of top Chemistry Questions

Identify \(Z\) in the sequence of reactions:
\(CH_3CH_2CH=CH_2  \xrightarrow{HBr/H_2O_2}Y \xrightarrow{C_2H_5ONa}Z\)
Which of the following will be most stable diazonium salt $(R\, N^{+}_{2}\,X^{-})$ ?
Which property of colloids is not dependent on the charge on colloidal particles?
Which of the following will not be soluble in sodium hydrogen carbonate?
Energy of one mole of photons of radiation whose frequency is $ 5\times 10^{14}\,Hz $ is
A crystalline solid $X$ reacts with $dil. HCl$ to liberate a gas $Y.Y$ decolourises acidified $KMnO_4$. When a gas $'Z'$ is slowly passed into an aqueous solution of $Y$, colloidal sulphur is obtained. $X$ and $Z$ could be, respectively
A metallic oxide reacts with water to form its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be
The radius of an atom is $300\,pm$. If it crystallizes in a face-centered cubic lattice, length of the edge of the unit cell is
The unstable intermediate dichlorocarbene $ {[:CCl_2]}$ is formed during
A 150 watt bulb emits light of wavelength 6600 $?$ and only 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?
In the following sets of ions, which one is not isoelectronic with the rest of the species? $ { O^{2-}, F^- , Na, Mg^{2+}, Al^{3+}, Ne} $
Van't Hoff factors of equimolal solutions of sodium chloride, barium chloride and glucose in water are
Vapour pressure of water at $293\, K$ is $17.535\, mm \,Hg$. The vapour pressure of water at $293 \,K$ containing $25 \,g$ of glucose dissolved in $450\, g$ of water is
$aP + bQ \to $ Products, when $[P]$ is doubled keeping $[Q]$ constant rate increases $2$ times, when $[P]$ is constant and $[Q]$ is doubled, rate increases four times. The overall order is
When $2$-bromopentane is heated with alcoholic solution of potassium hydroxide, the major product obtained is
Schottky defect in crystals is observed when
An orbital with $n = 3, l = 1$ is designated as
A crystalline solid has $A^-$ ions at the corners and face centres whereas $B^+$ ions are at the body centre and edge centres of the unit cell. The simplest formula of the compound will be
Rain water is called acid rain when its $pH$
For $S_N1$ reaction, the order of reactivity of haloalkanes is
The major product formed when alkyl iodide is treated with excess of ammonia
Atomic numbers of vanadium, chromium, nickel and iron are $23, 24, 28$ and $26$ respectively. Which one of these is expected to have the highest second ionization enthalpy?
Among the following compounds, the only one which is not an. artificial sweetening agent is
Among $2$-chloropropanoic acid, $3$-chloropropanoic acid, $2,2$-dichloroacetic acid and propanoic acid the $K_a$ values will be in the order,
The mole fraction of dioxygen in a neon-dioxygen mixture is $0.18$. If the total pressure of the mixture is $25$ bar, the partial pressure of neon in the mixture would be