List of top Chemistry Questions

If a $Z{n}^{2+}/Zn$ electrode is diluted $100$ times, then the emf will show: 

The solubility (in $\mathrm{mol}{L}^{-1}$) of $AgCl(K_{sp}=1.0\times {10}^{-10})$ in a $0.1MKCl$ solution will be:

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

In which of the following type of nano-material, one dimension is outside the nano scale?

A reaction has both ΔH and ΔS negative. The rate of reaction:

Which element has three shells which are completely filled with electrons?

Carrier ions like sodium ions facilitate the absorption of substances like:

Match correctly the functional group given in List-I with the Nomenclature of that functional group given in list-II:List IList IIa. Aldehydei. Propanoneb. Halogenii. Propanalc. Ketoneiii. Propanold. Alcoholiv. Bromopropane

The value of gas constant per degree per mole is approximately:

$Al_{2}(SO_{4})_{3} + CaCl_{2} \to CaSO_{4}+AlCl_{3}$ What is the mole no. of $CaCl_{2}$ in the reaction ?

Decreasing order towards $SN 1$ reaction for the following compounds is:

The correct order of $pK _{ a }$ values for the following compounds is:

Uncertainty principle is valid for

Two particles A and B are in motion and the wavelength of A is 5 × 10^-8 m. The wavelength of B, so that its momentum is double that of A, will be:

The pK_b of dimethylamine and pK_a of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is

At constant temperature 200 $cm^3$ of $N_2$ at 720 mm and 400 $cm^3$ of 02 at 750 mm pressure are put together in a one litre flask. The final pressureof mixture is

At 300 K, 36 g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of a urea solution is 1.52 bar its at the same temperature, concentration is

Aniline is prepared in presence of $Fe/HCl$ from

1$^\circ$ Alkyl isocyanide on reduction with Zn-Hg/ HCI give

2 L of $SO_2$ gas at 760 mm Hg are transferred to 10 L flask containing oxygen at a particular temperature, the partial pressure of $SO_2$ in the flask is

32.5 g of zinc (At. mass 65) will completely react with dilute sulphuric acid to give

An acidic solution of $Cu^{2+}$ containing $0.4\, g$ of $Cu^{2+}$ ions is electrolysed until all the copper is deposited. What is the volume of oxygen evolved at $NTP$ ?

An electrochemical cell can behave like an electrolytic cell when ________ .