List of top Chemistry Questions asked in NEET (UG)

Mechanism of a hypothetical reaction \(X_2 + Y_2→ 2XY\) is given below :
(i) \(X_2→ X + X\) (fast)
(ii) \(X + Y_2⇋ XY + Y\) (slow)
(iii) \(X + Y → XY\) (fast)
The overall order of the reaction will be

Which of the following reactions is appropriate for converting acetamide to methanamine?

The correct increasing order of basic strength for the following compounds is

Which of the following is a sink for CO?

For a given reaction, △H = 35.5 kJ mol^–1 and △S = 83.6 JK–1 mol^–1. The reaction is spontaneous at  :
(Assume that△H and △S do not vary with temperature)

The correct statement regarding electrophile is

A first order reaction has a specific reaction rate of 10^–2 s^–1. How much time will it take for 20 g of the reactant to reduce to 5 g?

Which one is the most acidic compound?

The species, having bond angles of 120° is

Which one is the wrong statement?

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code:

Column I		Column II
(a)	XX'	(i)	T-shape
(b)	XX'3	(ii)	Pentagonal bipyramidal
(c)	XX'5	(iii)	Linear
(d)	XX'7	(iv)	Square-pyramidal
		(v)	Tetrahedral

Pick out the correct statement with respect \([Mn(CN)_6]^{3–}\) :

A 20 litre container at 400 K contains CO₂(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be
(Given That: SrCO₃ (s) ⇋ SrO (s) + CO₂ (g). k_p=1.6 atm)

Which one of the following statements is not correct?

The equilibrium constants of the following are.
\(N_2+3H_2⇋NH_3\)     \(K_1\)
\(N_2+O_2⇋2No\)    \(K_2\)
\(H_2+\frac 12O_2⇋H_2O\)    \(K_3\)
The equilibrium constant \((K)\) of the reaction:
\(2NH_3+\frac 52O_2⇋2NO+3H_2O\)
will be

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy △U of the gas in joules will be

In the electrochemical cell :
\(Zn|ZnSO_4(0.01M)||CuSO_4(1.0 M)|Cu,\)
the emf of this Daniel cell is \(E_1\). When the concentration of \(ZnSO_4\) is changed to 1.0 M and that of \(CuSO_4\) changed to 0.01 M, the emf changes to \(E_2\). From the following, which one is the relationship between \(E_1\) and \(E_2\)?
(Given, \(\frac {RT}{F}= 0.059\))

It is because of inability of ns² electrons of the valence shell to participate in bonding that

The reason for greater range of oxidation states in actinoids is attributed to

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

In which pair of ions both the species contain S – S bond?

Consider the reactions :

Identify A,X,Y and Z.

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

Extraction of gold and silver involves leaching with CN^– ion. Silver is later recovered by

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is