List of top Questions asked in NEET (UG)

Which of the following statements is correct ?

The compound C₇H₈ undergoes the following reactions :

The product ‘C’ is

Identify the major products P, Q and R in the following sequence of reactions :

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether. A, B and C are in the order

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s² 2s² 2p³ , the simplest formula for this compound is

The correction factor ‘a’ to the ideal gas equation corresponds to

Consider the following species :
CN⁺, CN^–, NO and CN
Which one of these will have the highest bond order ?

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?

Which one is a wrong statement ?

The bond dissociation energies of X₂ , Y₂ and XY are in the ratio of 1 : 0·5 : 1. ΔH for the formation of XY is – 200 kJ mol^–1 . The bond dissociation energy of X₂ will be

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :

Then the species undergoing disproportionation is

In which case is the number of molecules of water maximum ?

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

For the redox reaction
\(MnO_4^-+C_2O^{2-}_4+H^+→Mn^{2+}+CO_2+H_2O\)
the correct coefficients of the reactants for the balanced equation are

Which one of the following conditions will favour maximum formation of the product in the reaction,
A₂(g) + B₂(g) ⇌ X₂(g) Δ_rH = – X kJ ?

Among CaH₂ , BeH₂ , BaH₂ , the order of ionic character is

The correct difference between first- and second-order reactions is that

Iron carbonyl, Fe(CO)₅ is

Which one of the following ions exhibits d-d transition and paramagnetism as well ?

The geometry and magnetic behaviour of the complex [Ni(CO)₄] are

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

Column I		Column II
a.	Co3+	i.	\(\sqrt8\) B.M.
b.	Cr3+	ii.	\(\sqrt{35}\) B.M.
c.	Fe3+	iii.	\(\sqrt3\) B.M.
d.	Ni2+	iv.	\(\sqrt{24}\) B.M.
		v.	\(\sqrt{15}\) B.M.

Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)

The type of isomerism shown by the complex [CoCl₂(en)₂] is