List of top Chemistry Questions

If the half cell reactions are given as (i) $Fe ^{2+}(a q)+2 e^{-} \rightarrow Fe (s) ;\,\,E^{\circ}=-0.44\, V$ (ii) $2 H ^{+}(a q)+\frac{1}{2} O _{2}(g)+2 e^{-} \rightarrow H _{2} O (l)$ $E^{\circ}=+1.23\, V$ The $E^{\circ}$ for the reaction $Fe (s)+2 H ^{+}+\frac{1}{2} O _{2}(g) \rightarrow Fe ^{2+}(a q)+ H _{2} O (l)$ is
The strongest Lewis acid among boron halides is
The complex showing a spin only magnetic moment of $2.82\, BM$ is
Which of the following have been arranged in decreasing order of oxidation number of sulphur?
The most adsorbed gas on activated charcoal is
Which of the following is a disaccharide?
Which of the following compounds does not leave residue on heating ?
Which of the following compounds dissolve in water?
Platinum, palladium and iridium are called ?noble metals? because
Electrovalent compounds are made up of
By slow distillation of rubber which of the following is obtained?
The letter $'D'$ in $D-glucose$ signifies____
The $ E_{{{M}^{3+}}/M{{n}^{2+}}}^{o} $ values for $ Cr, Mn, Fe $ and $ Co $ are $ -0.41,+1.57,+0.77 $ and $ +1.97\,V $ respectively. For which one of these metals the change in oxidation state from $+ 2$ to $+ 3$ is easiest?
The effective electrophile in aromatic. sulphonation is
The Henry?? law constant for the solubility of $N_2$ gas in water at $298\, K$ is $1.0 \times 10^5\, atm$. The mole fraction of $N_2$ in air is $0.8$. The number of moles of $N_2$ from air dissolved in $10$ moles of water at $298\, K$ and $5 \,atm$ pressure is
Excess of carbon dioxide is passed through $50 \,mL$ of $0.5\, M$ calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with $0.1\, N$ Hydrochloric acid. The volume of Hydrochloric acid required is (At. mass of calcium = $40$)
Dipole moments of HCI = 1.03 D, HI= 0.38 D. Bond length of $HCl = 1.3 \mathring{A}$ and $HI = 1.6 \mathring{A}$. The ratio of fraction of an electric charge, e existing on each atom in HCl and HI is
Aspirin is
The extent of physisorption of an adsorbate increases with
The type of bonds present in sulphuric anhydride are -
What are $X$ and $Y$ in the following reaction sequence? $C_2H_5OH \xrightarrow{Cl_2}(X) \xrightarrow{Cl_2} Y$.
$1.5 \,g$ of $CdCl_2$ was found to contain $0.9 \,g$ of $Cd$. Calculate the atomic weight of $Cd$.
What are $ABC$ in the following reactions ? (I) $(CH_2CO_2)_2Ca \xrightarrow{\Delta} A$ (II) $CH_3CO_2H \xrightarrow[\text{Red}]{HI} B$ (III) $2CH_3CO_2 \xrightarrow{P_4O_{10}} C$
In Gattermann reaction, a diazonium group is replaced by using $\underline{Y} \underline{X}$and $\underline{Y}$ are
Aluminium reacts with $NaOH$ and forms compound �$X$�. If the coordination number of aluminium in �$X$ � is $6$, the correct formula of $X$ is