List of top Chemistry Questions

Chemically unreactive three different gases $A, B$ and $C$ of molecular masses $16, 32$ and $64$ are enclosed in a vessel at constant temperature till equilibrium is reached. Which of the following statements is true?
When $6.3\, g$ of sodium bicarbonate are added to $30.0\, g$ of acetic acid solution, the residual solution is found to weigh $33.0\, g$. The mass of carbon dioxide released in the reaction is
According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
A solid compound $XY$ has $NaCl$ structure. If the radius of the cation is $100\, pm$, the radius of the anion $(Y^-)$ will be -
Which one of the following is present as an active ingredient in bleaching powder for bleaching action?
The complex, $[Pt(Py)(NH_3)Br\,Cl]$ will have how many geometrical isomers?
The rms velocity of hydrogen is $\sqrt {7}$ times the rms velocity of nitrogen. If $T$ is the temperature of the gas, which of the following is true?
Oxidative rancidity of oils can be prevented by adding
The dissociation constant of a weak base is $ {1 \times 10^{-5}}$ at 25?C. The pH of its 0.1 M solution at the same temperature.will be .
ln cuprarnmonium sulphate, copper is
Isopropyl chloride and isobutyl chloride reacts with sodium in ether to give?
The conjugate acid of $ {HCO_3^-}$ is
The decarboxylating agent is
Methoxymethane and ethanol exhibit
According to Lewis concept, an acid is a/an
Aldol condensation is given by
The compound which gives hydrocarbon on distillation with zinc dust is
As we move from left to right in the 3d-series elements
Following is the substitution reaction in which \(-CN\) replaces \(-Cl\)
\(R - CI + KCN \overset{\Delta}{\rightarrow} R - CN + KCI\)
To obtain propane nitrile, \(R-Cl\) should be:
Which of the two ions from the list given below, have the geometry that is explained by the same hybridisation of orbitals $NO^- _ 2 ,NO_3^- , NH_2^- , NH_4^+,SCN ^- ?$
What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \, eV$?
Clemmensen reduction of a ketone is carried out in the presence of which of the following?
A gaseous mixture was prepared by taking equal moles of $CO$ and $N_2.$ If the total pressure of the mixture was found $1$ atmosphere, the partial pressure of the nitrogen $(N_2)$ in the mixture is
A solution contains ${Fe^{2+}, Fe^{3+}}$ and $I^-$ ions. This solution was treated with iodine at ${ 35^{\circ} C. E^{\circ}}$ for ${Fe^{3+} /Fe^{2+}}$ is $+0.77 \, V$ and $E^{\circ}$ for $I_2/2I^- = 0.536 \, V.$ The favourable redox reaction is-
Two different electrolytic cells filled with molten $Cu(NO_3)_2$ and molten $Al(N0_3)_3$ respectively are connected in series. When electricity is passed 2. 7 g Al is deposited on electrode. Calculate the weight of Cu deposited on cathode. $[Cu = 63 .5; Al= 27 .0 g mol^{-1} ]$