List of top Chemistry Questions asked in NEET (UG)

The ions \(O_2^–\), \(F^–\),  \(Na^+\), \(Mg^{2+}\) and \(Al^{3+}\) are isoelectronic. Their ionic radii show:

The reaction, $A \rightarrow B$ follows first order kinetics. The time taken for $0.8$ mole of A to produce $0.6$ mole of B is 1h. What is the time taken for the conversion of $0.9$, mole of A to $0.675$ mole of $B$?

Vitamin $B_{12}$ contains

Among the following which is not the $\pi$-bonded organometallic compound

If the rate of a reaction is equal to the rate constant, the order of the reaction is

The reaction quotient (Q) for the reaction \(N_2(g) + 3H_2(g)⇋2NH_3(g)\) is given by \(Q =\frac { [NH_3]^2}{[N_2][H_2]^3}\). The reaction will proceed from right to left if: (where K_C is the equilibrium constant)

For which one of the following equations is ∆Hº_react equal to ∆Hº_f for the product:

The oxidation states of sulphur in the anions $SO _{3}{ }^{2-}, S _{2} O _{4}{ }^{2-}$ and $S _{2} O _{6}{ }^{2-}$ follow the order -

The solubility product of AgI at 25ºC is 1.0×10^–16 mol²L^–2. The solubility of AgI in 10^–4N solution of KI at 25ºC is approximately (in mol L^–1):

The value of Planck's constant is $ 6.63 \times 10^{-34} \,Js.$ The velocity of light is $3.0 \times 10^8\, ms^{-1}$. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of $8 \times 10^{15}\, s^{-1}$?

According to IUPAC nomenclature sodium nitroprusside is named as

Glycolysis is

Phospholipids are esters of glycerol with

Which one of the following orders of acidic strength is correct ?

Formation of a solution from two components can be considered as : (i) Pure solvent $\rightarrow$ separated solvent molecules, $\Delta H _{1}$ (ii) Pure solvent $\rightarrow$ separated solvent molecules, $\Delta H _{2}$ (iii) Separated solvent and solute molecules $\rightarrow$ solution, $\Delta H _{3}$ Solution so formed will be ideal if

Which of the following orders of acid strength is correct: 

The activation energy for a simple chemical reaction, $A\longrightarrow$ B is $E_{a}$ in forward direction. The activation energy for reverse reaction

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, $k = A.e ^{- E ^{*} / RT }$. Activation energy $\left( E ^{*}\right)$ of the reaction can be calculated by plotting

The ions $O ^{2-}, F ^{-}, Na ^{+}, Mg ^{2+}$ and $Al ^{3+}$ are isoelecronic. Their ionic radii show :

Chargaff's rule states that in an organism

Which of the following statements is not true:

On the basis of the information available from the reaction: \(\frac 43 Al+O_2→\frac 23 Al_2O_2\), ∆G = -827 KJ mol^-1 of O₂, the minimum e.m.f. required to carry out electrolysis of Al₂O₃ is (F = 96500 C mol^–1)

In Haber process $30\,L$ of dihydrogen and $30\,L$ of dinitrogen were taken for reaction which yielded only $50\%$ of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?

The molarity of pure water is: