List of top Chemistry Questions asked in NEET (UG)

The value of Planck's constant is 6.63×10^–34Js. The velocity of light is 3.0×10⁸ ms^–1. Which value is closest to the wavelength in nanometers of a quantum of light with a frequency of 8×10¹⁵ s^–1:

What is the entropy change (in JK^–1mol^–1) when one mole of ice is converted into water at 0ºC?(The enthalpy change for the conversion of ice to liquid water is 6.0 KJ mol^–1 at 0ºC)

IUPAC name of the compound given below is:

The radioisotope, tritium 13(H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years:

Which one of the following is a free-radical substitution reaction:

The final product C, obtained in this reaction, would be:

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

In a set of the given reactions, acetic acid yielded a product C.
CH₃COOH+PCl₅$\rightarrow$ A $\xrightarrow[Anh.\,AlCl_3]{C_6H_6}$ B $\xrightarrow[ether]{C2H5MgBr}$ ‘C’, product C would be

Acrolein is a hard,horny and a high melting point material. Which of the following represent its structure:

A and B in the following reactions are :

Which one of the following monomers gives the polymer neoprene on polymerization :

The compound on reaction with NaIO₄ in the presence of KMnO₄ given:

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 e.m.f. of a Daniell cell at 298 K is E₁. Zn/SO₄ (0.01 M) || CuSO₄(1.0 M)/Cu. When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the e.m.f. is changed to E₂. What is the relationship between E₁ and E₂?

$CuSO_4 $ when reacts with KCN forms CuCN which is insoluble in water. It is soluble in excess of KCN due to the formation of the complex :-

In the silver plating of copper, $K[AG(CN)_2]$ is used instead of $AgNO_3. $ The reason is :-

Enzymes are made up of :-

Z in the above reaction sequence is :-

Reactivity order of halides for dehydrohalogenation is :-

Which of the following statements is true:-

van der Waals' real gas, act as an ideal gas, at which condition :-

Heat of combustion $ \Delta H^{\circ}$ for $ C ( s ), H _{2}( g )$ and $CH _{4}( g ) $ are -94,-68 and $-213 \,Kcal / mol $ then $\Delta H ^{\circ}$ for $C ( s )+2 H _{2}( g ) \to CH _{4}( g )$ is:-