List of top Chemistry Questions

Cheilosis and digestive disorders are due to deficiency of:

A tetrapeptide is made of naturally occurring alanine, serine, glycine, and valine. If the C-terminal amino acid is alanine and the N-terminal amino acid is chiral, the number of possible sequences of the tetrapeptide is:

Which one of the following is a water-soluble vitamin that is not excreted easily?

Glycosidic linkage between C$_1$ of $\alpha$-glucose and C$_2$ of $\beta$-fructose is found in:

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is:

Which of the following is not a semi-synthetic polymer?

Zinc acetate - antimony trioxide catalyst is used in the preparation of which polymer?

........ is a potent vasodilator.

The density of $\beta$-Fe is 7.6 g/cm$^3$. It crystallizes in a cubic lattice with $ a = 290 $ pm.
What is the value of $ Z $? ($ Fe = 56 $ g/mol, $ N_A = 6.022 \times 10^{23} $ mol$^{-1}$)

The equilibrium constant for the dissociation of HI at 773 K is:

200 g of 20\% w/w urea solution is mixed with 400 g of 40\% w/w urea solution. What is the weight percentage (w/w \%) of resultant solution?

At 27°C, the degree of dissociation of HA (weak acid) in 0.5 M of its solution is 1%. The concentrations of H$_3$O$^+$, A$^-$, and HA at equilibrium (in mol L$^{-1}$) are respectively:

2.644 g of metal (M) was deposited when 8040 coulombs of electricity was passed through molten MF$_2$ salt. What is the atomic mass of M? (F = 96500 C mol$^{-1}$)

At 300 K, $ \Delta_r G^\circ $ for the reaction $ A(g) \rightleftharpoons B(g) $ is $ -11.5 $ kJ mol$^{-1}$. The equilibrium constant at 300 K is approximately: $(R = 8.314 \text{ J mol}^{-1} \text{ K}^{-1})$

Which among the following compounds show metal excess defect due to anionic vacancy?

Number of moles of ions produced by the complete dissociation of one mole of Mohr’s salt in water is:

The sum of number of angular nodes and radial nodes for 4d orbital is:

The oxidation number of Co in complex [Co(H$_2$NCH$_2$CHNH$_2$)$_3$]$_2$(SO$_4$)$_3$ is:

p-Methyl benzene nitrile can be prepared from which of the following?

What is the overall order of the reaction which has the following rate expression? Rate = k[A]$^\frac{1}{2}$[B]$^\frac{3}{2}$

$ x $ g of an organic compound was analysed by Kjeldahl’s method for the estimation of nitrogen. The ammonia gas evolved from the compound was passed into 100 mL of 0.2 M H$_2$SO$_4$. The excess of acid required 40 mL of 0.5 M NaOH solution for complete neutralisation. What is $ x $ when the percentage of nitrogen in it is 46%?

Match List-I with List-II:

What is Y in the following reaction sequence?

Arrange the following in the increasing order of number of unpaired electrons present in the central metal ion:
I. $[MnCl_6]^{4-}$
II. $[FeF_6]^{3-}$
III. $[Mn(CN)_6]^{3-}$
IV. $[Fe(CN)_6]^{3-}$

Aqueous CuSO₄ solution was electrolysed by passing 2 amp of current for 10 min. What is the weight (in g) of copper deposited at cathode? (Cu = 63 u; F = 96500 C mol^-1)