List of top Chemistry Questions

In the extraction of iron, the reaction which occurs at 900-1500 K in blast furnace is

In which of the following metals extraction, impurities are removed as slag?

The reactions which occur in blast furnace at 500 – 800 K during extraction of iron from haematite are
i. $3Fe_2O_3 + CO \rightarrow 2Fe_3O_4 + CO_2$
ii. $Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$
iii. $FeO + 4CO \rightarrow 3Fe + 4CO_2$
iv. $FeO + CO \rightarrow 2FeO + CO_2$

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.

0.1 mole of H$_3$PO$_3$ is present in 500 mL of solution. The normality of it is:

Evaluate the correctness of the given statements.
I. Negative deviation occurs when A-B interactions are stronger than A-A and B-B.
II. Reverse osmosis requires applied pressure greater than osmotic pressure.

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)

Two statements are given below:
Statement - I: Liquids A and B form a non-ideal solution with positive deviation. The interactions between A and B are weaker than A-A and B-B interactions.
Statement - II: For an ideal solution, $ \Delta H_{\text{mix}} = 0 $, $ \Delta V_{\text{mix}} = 0 $.
The correct answer is

At $ T(K) $, two liquids A and B form an ideal solution. The vapour pressures of pure liquids A and B at that temperature are 400 and 600 mm Hg respectively. If the mole fraction of liquid B is 0.3 in the mixture, the mole fractions of A and B in vapour phase respectively are:

50 mL of 1 M HCl was completely reacted with $x$ g of CaCO3 to form CaCl2, CO2, and H2O. What is the value of $x$ in g?

A few isotherms of CO2 are shown below. Identify the correct statements (Tc is the critical temperature of CO2; T1<T2<T3<Tc):
I. At point X, CO₂ exists as liquid
II. At point Y, CO₂ exists as gas
III. At point Z, CO₂ exists as liquid

In which of the following pairs, both molecules possess dipole moment?

The number of molecules having one lone pair of electrons on the central atom is from the following list: SnCl$_2$, XeF$_6$, SO$_3$, ClF$_3$, BrF$_5$, H$_2$O, XeO$_3$.

A crystalline solid of the type AB$_2$ has a ccp arrangement for its element B. So, A occupies:

Arrange the following in increasing order of their pK$_b$ values.

Which of the following can act as Lewis acids?
[i.] $ {CCl}_4 $
[ii.] $ {GeCl}_4 $
[iii.] $ {SiF}_4 $

The correct set of four quantum numbers for an electron in a 4d subshell is:

At 500 K, for the reaction \[ {PCl}_5(g) \leftrightarrow {PCl}_3(g) + {Cl}_2(g) \] the equilibrium constant $ K_c $ is 1.8 mol/L. What is $ K_p $ in atm at the same temperature? \[ R = 0.082 { L atm mol}^{-1} {K}^{-1} \]

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?

Identify the correct statements from the following:
I. For spontaneous reaction, $ \Delta S_{\text{total}} < 0 $ and $ \Delta H > 0 $
II. Pressure is an intensive property
III. Bomb calorimeter works at constant volume

Identify the correct order of polarizing power of given cations:

Two statements are given below:
I. SO₂ is used as antioxidant in wine
II. BHA is used as food preservative in dry fruits

Two statements are given below:
I. Cellulose acetate is rayon
II. Perlan-L is nylon 6, 6

Adsorption of a gas on a solid obeys the Freundlich adsorption isotherm. In the graph drawn between $\log (x/m)$ (on the y-axis) and $\log p$ (on the x-axis), the slope and intercept are found to be 1 and 0.3, respectively. If the initial pressure of the gas is 0.02 atm, the mass of the gas adsorbed per gram of solid is (${antilog } 0.3 = 2$).

Acetophenone can be prepared from which of the following reactants?