List of top Chemistry Questions

The metal purified by Mond process is X. The number of unpaired electrons in X is
The energy required to increase the temperature of 180 g of liquid water from 10$^\circ$C to 15$^\circ$C is 3765 J. What is $C_p$ of water in J mol$^{-1}$ K$^{-1}$? ($H_2O$ = 18 u)
The difference between the radii of \(3^{rd}\) and \(2^{nd}\) orbit of H-atom is x pm. The difference between the radii of \(4^{th}\) and \(3^{rd}\) orbit of \( \text{Li}^{2+} \) ion is y pm. \(y:x\) is equal to
What volume will 2 moles of an ideal gas occupy at STP (Standard Temperature and Pressure)?
The correct order of increasing bond lengths of C--H, O--H, C--C, and H--H is
Choose the incorrect statement from the following

How many of the following molecules / ions have a trigonal planar structure? 
\( \text{BO}_3^{3-}, \, \text{NH}_3, \, \text{PCl}_3, \, \text{BCl}_3, \, \text{ClF}_3, \, \text{XeO}_3 \)

What is the drug used to control depression and hypertension?
How many atoms are present in 1 mole of oxygen gas (O2)?
The \(E^\circ_{{M}^+_{(aq)}}/{M}_{(s)}\) is highest with negative sign for alkali metal 'x' and lowest with negative sign for alkali metal 'y'. In flame test, the characteristic colours of 'x' and 'y' are respectively:

At T(K), \( K_c \) value for \( \text{AO}_2(g) + \text{BO}_2(g) \rightleftharpoons \text{AO}_3(g) + \text{BO}(g) \) is 16. In a closed 1 L flask, one mole each of \( \text{AO}_2 \), \( \text{BO}_2 \), \( \text{AO}_3 \), and \( \text{BO} \) are taken and heated to T(K). What is the concentration (in mol L\(^{-1}\)) of \( \text{AO}_3 \) at equilibrium?  

In acid medium, dichromate oxidizes sulphite to sulphate. In this redox reaction, the oxidation state of sulphur changes from \(x\) to \(y\). What is the value of \(x + y\)?

What are X and Y in the following reaction sequence?

Choose the incorrect statement from the following:
At what temperature (in K) the rms velocity of SO\(_2\) molecules is equal to rms velocity of O\(_2\) molecules at \(27 \, ^\circ\text{C}\)?
The composition of a sample of wustite is \( \text{Fe}_{0.93} \text{O}_{1.00} \). Percentage of iron in the form of \( \text{Fe}^{3+} \) ion is nearly:
At 300 K, vapour pressure of pure liquid A is 70 mm Hg. It forms an ideal solution with liquid B. Mole fraction of B = 0.2 and total vapour pressure of solution = 84 mm Hg. What is vapour pressure (in mm) of pure B?
Identify the ion (hydrated in solution) which is not correctly matched with its spin only magnetic moment (in BM) given in brackets:
An element crystallizes in bcc lattice. The atomic radius of the element is 2.598 \AA. What is the volume (in cm$^3$) of one unit cell?
The structure of the product 'Z' in the reaction sequence is: \[ \text{CHO} \] \[ \mid \] \[
Among the following compounds, which one is not responsible for the depletion of ozone layer?
A and B are ideal gases. At T(K), 2 L of A with a pressure of 1 bar is mixed with 4 L of B with a pressure of P\(_B\) bar in a 100 L flask. The pressure exerted by gaseous mixture is 0.1 bar. What is the value of P\(_B\) in bar?

Match the following molecules with their bond angles:

List-I (Molecule) List-II (Bond angle) 
A) \(\mathrm{NH}_3\) I) 102.2° 
B) \(\mathrm{O}_3\) II) 107.8° 
C) \(\mathrm{S}_6\) III) 93.6° 
D) \(\mathrm{PH}_3\) IV) 117° 
Which of the following are carbonate ores?
I. Siderite
II. Kaolinite
III. Calamine
IV. Sphalerite
Identify the artificial sweetener which has highest sweetness value compared to cane sugar