List of top Chemistry Questions asked in NEET (UG)

Nucleophilic addition reaction will be most favoured in:

A hypothetical electrochemical cell is shown below 
\(A|A+ (xM)|| B+ (yM)| B \)
The emf measured is +0.20 V. The cell reaction is:

[Cr(H₂O)₆]Cl₃ (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:

In which of the following molecules are all the bonds not equal?

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields:

The enthalpy and entropy change for the reaction : Br₂(l) + Cl₂(g) → 2BrCl(g) are 30 kJ mol^-1 and 105 JK^-1 mol^-1 respectively. The temperature at which the reaction will be in equilibrium is :

The enthalpy of combustion of H₂, cyclohexene (C₆H₁₀) and cyclohexene (C₆H₁₂) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

Assume each reaction is carried out in an open container. For which reaction will ∆H = ∆E?

If E°_Fe²⁺/Fe = -0.441 V and E°_{Fe³⁺/Fe²⁺} = 0.771 V, the standard emf of the reaction: Fe + 2Fe³⁺ \(→\) 3Fe²⁺ will be:

The general molecular formula, which represents the homologous series of alkanols is :

A plot of \(log\ \frac {x}{m}\) versus \(log \ p\) for the adsorption of a gas on a solid gives a straight line with slope equal to:

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is:

More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is:

The major organic product in the reaction, CH₃ – O – CH(CH₃)₂ + HI \(→\) Product is:

In which of the following pairs are both the ions coloured in aqueous solution? (Atomic number: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

Which of the following pairs constitutes a buffer?

For the reaction $CH_{4}(g)+2O_2(g) {<=>}CO_2(g)+2H_2O(\ell) \Delta H_{r} =-170.8\,KJ\,mol^{-1}$ Which of the following statements is not true:

Which one of the following orders is not in accordance with the property stated against it?

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :-

The correct order of the mobility of the alkali metal ions in aqueous solution is

The correct order regarding the electronegativity of hybrid orbitals of carbon is

$[NH(CH_2)NHCO(CH_2)_4CO]_{n}$ is a:-

In a set of reactions propionic acid yielded a compound $D$. $CH_3CH_2COOH\xrightarrow{SOCL_2} B\xrightarrow{NH_3}C\xrightarrow [Br_2]{KOH} D$ The structure of $D$ would be

Consider the reaction, $N_2(g)+3H_2(g) \to 2NH_3(g)$ The equality relationship between $\frac{d[NH_3]}{dt}$ and $-\frac{d [H_2]}{dt}$ is :-