List of top Chemistry Questions asked in NEET (UG)

Chloropicrin is obtained by the reaction of

A compound formed by elements $X$ and $Y$ crystallizes in a cubic structure in which the $X$ atoms are at the corners of a cube and the $Y$ atoms are at the face-centers. The formula of the compound is :-

Which of the following forms cationic micelles above certain concentration?

Which of the following is least reactive in a nucleophilic substitution reaction?

$CN^-$ is strong field ligand. This is due to the fact that

Which one of the following statements about the zeolites is false ?

The rate of first order reaction is $1.5 \times 10^{-2}$ mol $L^{-1} \, min^{-1}$ at 0.5 M concentration of the reactant. The half-life of the reaction is

The rapid change of $pH$ near the stoichiometric point of an acid base titration is the basis of indicator detection. $pH$ of the solution is related to ratio of the concentrations of the conjugate acid ($HIn$) and base $ (In^-) $ forms of the indicator given by the expression

In $BrF_3$ molecule, the lone pairs occupy equatorial positions to minimise

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

Which one of the following compounds is not a protonic acid:

Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms:

The oxidation states of sulphur in the anions SO₃^2–, S₂O₄^2– and S₂O₆^2– follow the order- 

The pyknometric density of sodium chloride crystal is 2.165×10³ kg m^–3 while its X-ray density is 2.178×10³ kg m^–3. The fraction of unoccupied sites in sodium chloride crystal is:

For the reaction: \(C_3H_8(g)+5O_2(g)→3CO_2(g)+4H_2O(l)\) at constant temperature, ∆H–∆E 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)

Which of the following statements is not true:

The method of zone refining of metals is based on the principle of:

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)

The reaction \(\text {A→B}\) follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B.

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):

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

The molar heat capacity of water at constant pressure, C, is 75 JK^–1mol^–1. When 1.0 KJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is:

Which one of the following characteristics of the transition metals is associated with their catalytic activity:

According to the adsorption theory of catalysis, the speed of the reaction increase because: