List of top Chemistry Questions

Consider the figure provided. 1 mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at $18^\circ \text{C}$. If the piston is moved to position B, keeping the temperature unchanged, then 'x' $\text{L atm}$ work is done in this reversible process. $x =$ ______ $\text{L atm}$. (nearest integer)
$[ \text{Given: Absolute temperature} = ^\circ \text{C} + 273.15, \, R = 0.08206 \, \text{L atm mol}^{-1} \text{K}^{-1} ]$

What is the mass of crystalline oxalic acid (molar mass = 126 g/mol) present in 50 mL of 0.02N aqueous oxalic acid solution?

The molecular formula of a crystalline solid is X$ _3 $Y$ _2 $. Atoms of Y form ccp lattice, and atoms of X occupy 50% octahedral voids and x% of tetrahedral voids. What is the percentage of unoccupied tetrahedral voids?

The atoms of $^ {6}C^{13}$ and $^ {7}N^{14}$ are considered as:

The critical temperature of A, B, C, D gases are 190 K, 630 K, 261 K, 400 K respectively. The quantity of gas adsorbed per gram of charcoal at same pressure is least for the gas

The solution from the following with highest depression in freezing point/lowest freezing point is

Match List I with List II

List-I (Conversion)		List-II (Shape/geometry)
(A)	1 mol of H₂O to O₂	(I)	3F
(B)	1 mol of MnO^-₄ to Mn²⁺	(II)	2F
(C)	1.5 mol of Ca from molten CaCl₂	(III)	1F
(D)	1 mol of FeO to Fe₂O₃	(IV)	5F

Choose the correct answer from the options given below:

At 300 K, the vapour pressures of A and B liquids are 500 and 400 mm Hg respectively. Equal moles of A and B are mixed to form an ideal solution. The mole fraction of A and B in vapor state is respectively.

A compound is formed by atoms of A, B and C. Atoms of C form hcp lattice. Atoms of A occupy 50% of octahedral voids and atoms of B occupy $\frac{2}{3}$ of tetrahedral voids. What is the molecular formula of the solid?

A solid compound is formed by atoms of A (cations), B (cations), and O (anions). Atoms of O form an hcp lattice. Atoms of A occupy 25% of tetrahedral holes and atoms of B occupy 50% of octahedral holes. What is the molecular formula of the solid?

Match List-I with List-II:

Which of the following are the conditions for a reaction spontaneous at all temperatures?

Arrange the following halides in decreasing order of their reactivity towards dehydrohalogenation:

Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:

The wavelength (in cm) of the second line in the Lyman series of the hydrogen atomic spectrum is (Rydberg constant $ R \, \text{cm}^{-1})$.

Identify the product in the following reaction :

The wavelength of an electron is $ 10^3 $ nm. What is its momentum in kg m s$^{-1}$?

What will be the increasing order of basic strength of the following compounds: $\text{C}_2\text{H}_5\text{NH}_2, (\text{C}_2\text{H}_5)_2\text{NH},(\text{C}_2\text{H}_5)_3\text{N},\text{C}_6\text{H}_5\text{NH}_2$

0.592 g of copper is deposited in 60 minutes by passing 0.5 amperes current through a solution of copper (II) sulphate. The electro chemical equivalent of copper (II) in g/C is:

Arrange the following elements in increasing order of first ionization enthalpy:
Li, Be, B, C, N
Choose the correct answer from the options given below:

Observe the following species: (i) $ NH_3 $ (ii) $ AlCl_3 $ (iii) $ SnCl_4 $ (iv) $ CO_2 $ (v) $ Ag^+ $ (vi) $ HSO_4^- $ How many of the above species act as Lewis acids?

Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is x × 10^–3. Value of x is _______. (integer answer)

Vapour pressures of pure liquids 'A' and 'D' are 500 mm Hg and 800 mm Hg, respectively.The binary solution of ’A’ and ’D’ boils at 50◦C and 700 mm Hg pressure.The mole percentage of D in the solution is:

Identify the correct order of organic compounds in the following chemical reaction:

(A) CH₃MgBr
(B) CH₃Br
(C) CH₃Cl
(D) CH₄
Choose the correct answer from the options given below:

A solid is dissolved in 1 L water. The enthalpy of its solution ($\Delta H_{{sol}}^\circ$) is 'x' kJ/mol. The hydration enthalpy ($\Delta H_{{hyd}}^\circ$) for the same reaction is 'y' kJ/mol. What is lattice enthalpy ($\Delta H_{{lattice}}^\circ$) of the solid in kJ/mol?