NEET 2023

Consider the following reaction and identify the product (P).

Consider the following reaction

Identify products A and B :-

Which amongst the following will be most readily dehydrated under acidic conditions?

Complete the following reaction:

[C] is _______.

Identify the major product obtained in the following reaction:

Identify the final product [D] obtained in the following sequence of reactions.

Given below are two statements:
Statement I : A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside
Statement II : When nucleoside is linked to phosphorous acid at 5' position of sugar moiety, we get nucle...

Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is
\(\mathrm{NH}_{3}, \mathrm{AlCl}_{3}, \mathrm{BeCl}_{2}, \mathrm{CCl}_{4}, \mathrm{PCl}_{5}\) :

The correct order of energies of molecular orbitals of \(\mathrm{N}_{2}\) molecule, is

Taking stability as the factor, which one of the following represents correct relationship?

Intermolecular forces are forces of attraction and repulsion between interacting particles that will include:
A. dipole - dipole forces.
B. dipole - induced dipole forces
C. hydrogen bonding
D. covalent bonding
E. dispersion forces
Choose t...

For a certain reaction, the rate \(=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{~B}]\), when the initial concentration of A is tripled keeping concentration of \(\mathrm{B}\) constant, the initial rate would

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : A reaction can have zero activation energy.
Reason R : The minimum extra amount of energy absorbed by reactant molecules so ...

Some tranquilizers are listed below. Which one from the following belongs to barbiturates?

Homoleptic complex from the following complexes is :

Which complex compound is most stable?

The stability of \(\mathrm{Cu}^{2+}\) is more than \(\mathrm{Cu}^{+}\) salts in aqueous solution due to -

Which of the following statements are INCORRECT?
A. All the transition metals except scandium form MO oxides which are ionic.
B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $$\mat...

The conductivity of centimolar solution of \(\mathrm{KCl}\) at \(25^{\circ} \mathrm{C}\) is \(0.0210 ~\mathrm{ohm}^{-1} \mathrm{~cm}^{-1}\) and the resistance of the cell containing the solution at \(25^{\circ} \mathrm{C}\) is $$60 ~\mathrm...

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A : In equation \(\mathrm{\Delta_rG=-nFE_{cell}}\), value of \(\mathrm{\Delta_rG}\) depends on n.
Reason R : $$\mathrm{E_{cell}}...

Given below are two statements:
Statement I : The nutrient deficient water bodies lead to eutrophication.
Statement II : Eutrophication leads to decrease in the level of oxygen in the water bodies.
In the light of the above statements, choo...

Which amongst the following options is correct graphical representation of Boyle's law?

The given compound

is an example of _________.

Identify product \((\mathrm{A})\) is the following reaction :

Which of the following statements are NOT correct?
A. Hydrogen is used to reduce heavy metal oxides to metals.
B. Heavy water is used to study reaction mechanism.
C. Hydrogen is used to make saturated fats from oils
D. The $$\mathrm{H}-\mat...

Identify the product in the following reaction:

Which of the following reactions will NOT give primary amine as the product?

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Helium is used to dilute oxygen in diving apparatus.
Reason R : Helium has high solubility in O\(_2\).
In the light of the ...

Match List I with List II:

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The element expected to form largest ion to achieve the nearest noble gas configuration is

Match List I with List II:

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Which amongst the following molecules on polymerization produces neoprene?

The reaction that does NOT take place in blast
furnace between 900 K to 1500 K temperature
range during extraction of iron is :

On balancing the given redox reaction,
$$\mathrm{aCr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{bSO}_{3}^{2-}(\mathrm{aq})+\mathrm{cH}^{+}(\mathrm{aq}) \rightarrow 2 \mathrm{aCr}^{3+}(\mathrm{aq})+\mathrm{bSO}_{4}^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{...

Given below are two statements : one is labelled as
Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\) :
Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.
...

Which one of the following statements is correct?

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :

A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy \(1 / 3\) of tetrahedral voids. If the formula of the compound is \(\mathrm{A}_{x} \mathrm{B}_{y}\), then the value of $$x...

What fraction of one edge centred octahedral void lies
in one unit cell of fcc?

The right option for the mass of \(\mathrm{CO}_{2}\) produced by heating \(20 \mathrm{~g}\) of \(20 \%\) pure limestone is
(Atomic mass of \(\mathrm{Ca}=40\) )
$$\left[\mathrm{CaCO}_{3} \stackrel{1200 \mathrm{~K}}{\longrightarrow} \mathrm{C...

The number of \(\sigma\) bonds, \(\pi\) bonds and lone pair of electrons in pyridine, respectively are:

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \(\mathrm{Fe}^{3+}\) due to the formation of-

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

Consider the following compounds/species:

The number of compounds/species which obey Huckel's rule is ___________.

Select the correct Statements from the following :
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is \(9.10939 \times 10^{-31} \mathrm{~kg}\).
C. All the isotopes of a given elements show sam...

The relation between \(\mathrm{n}_{\mathrm{m}},\left(\mathrm{n}_{\mathrm{m}}=\right.\) the number of permissible values of magnetic quantum number \((\mathrm{m})\)) for a given value of azimuthal quantum number \((l)\), is

Which one is an example of heterogenous catalysis?

Pumice stone is an example of -

The equilibrium concentrations of the species in the reaction \(\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}\) are \(2,3,10\) and \(6 \mathrm{~mol}\) \(\mathrm{L}^{-1}\), respectively at $$300 \mathrm{~K} . \Delta \mathrm{...

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?