List of top Chemistry Questions asked in NEET (UG)

A gaseous mixture was prepared by taking equal moles of $CO$ and $N_2.$ If the total pressure of the mixture was found $1$ atmosphere, the partial pressure of the nitrogen $(N_2)$ in the mixture is

A solution contains ${Fe^{2+}, Fe^{3+}}$ and $I^-$ ions. This solution was treated with iodine at ${ 35^{\circ} C. E^{\circ}}$ for ${Fe^{3+} /Fe^{2+}}$ is $+0.77 \, V$ and $E^{\circ}$ for $I_2/2I^- = 0.536 \, V.$ The favourable redox reaction is-

The correct order of increasing bond length of $ C - H, C - O, C - C$ and $ C = C $ is

Enthalpy change for the reaction, $4 H _{( g )} \rightarrow 2 H _{2( g )}$ is $-869.6\, kJ$ The dissociation energy of $H - H$ bond is

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description ?

Which one of the following is employed as Antihistamine?

Acidified $K_2Cr_2O_7 $ solution turns green when $Na_2SO_3 $ is added to it. This is due to the formation of

Which one of the following statements is not true regarding $(+)$ lactose?

Which of the following is not a fat soluble vitamin ?

Which of the following carbonyls will have the strongest C-O bond ?

The rate of the reaction $ {2 N_2 O_5 -> 4 NO_2 + O_2}$ can be written in three ways: $\frac{-d [N_2 O_5]}{dt} = k [N_2 O_5]$ $\frac{d[NO_2]}{dt} = k' [N_2 O_5]$ $\frac{d[O_2]}{dt} = k" [N_2 O_5]$ The relationship between k and k' and between k and k'' are-

The freezing point depression constant for water is $-1.86^{\circ} Cm^{-1}$. If $5.00 \,g$ $Na_2SO_4$ is dissolved in $45.0\,g$ $H_2O$, the freezing point is changed by $- 3.82^{\circ} C$. Calculate the Van't Hoff factor for $Na_2SO_4$.

Consider the following processes : $\Delta H (kJ / mol)$ ½ A → B + 150 3B → 2C + D -125 E + A → 2D +350 For B + D → E + 2C, ΔH will be-

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?

Which of the following has the minimum bond length?

The total number of atomic orbitals in fourth energy level of an atom is :

The following two reactions are known ${Fe2O3(s) + 3CO(g) -> 2Fe(s) + 3CO2(g); \Delta H = - 26.8 \, kJ }$ ${FeO(s) + CO (g) -> Fe(s) + CO2(g); \Delta H - 16.5 \, kJ}$ The value of $\Delta H$ for the following reaction ${Fe2O3(s) + CO(g) -> 2FeO(s) + CO2(g) }$ is

Which of the following expressions correctly represents the equivalent conductance at infinite dilution of ${Al2(SO4)3}$ ? Given that ${\wedge^{\circ}_{Al^{3+}}}$ and ${- \wedge^{\circ}_{SO^{2-}_4}}$ are the equivalent conductances at infinite dilution of the respective ions

Among the following which one has the highest cation to anion size ratio?

Among the elements $Ca, Mg, P$ and $Cl$, the order of increasing atomic radii is -

Some statements about water are given below: (a) Heavy water is used as a moderator in nuclear reactors (b) Heavy water is more associated than ordinary water (c) Heavy water is more effective solvent than ordinary water. Which of the above statements are correct ?

How many bridging oxygen atoms are present in ${P_4 O_{10}}$ ?

The number of atoms in $0.1$ mole of a triatomic gas is $(N_A = 6.023 \times 10^{23} \, mol ^{-1})$

The correct order of increasing bond angles in the following species is

The reaction ${ 2A_{(g)} + B_{(g)} <=> 3C_{(g)} + D_{(g)}}$ is begun with the concentrations of $A$ and $B$ both at an intial value of $1.00\, M$. When equilibrium is reached, the concentration of $D$ is measured and found to be $0.25 \,M$. The value for the equilibrium constant for this reaction is given by the expression.