List of top Chemistry Questions asked in NEET (UG)

The functional group that can be identified through Tollens' reagent test is:

Match List-I with List-II.

List-I	Complex / Ion
A	[CoCl₂(NH₃)₄]
B	[Co(NH₃)₆]Cl₃
C	[NiCl₄]²⁻
D	[Fe(CO)₅]

List-II	Shape / Geometry
I	Octahedral
II	Trigonal bipyramidal
III	Square planar
IV	Tetrahedral

In the following reaction sequence, \(X\) and \(Z\), respectively, are: \[ {CH3CH2CH2OH →[PCl5] CH3CH2CH2Cl + X + HCl} \] \[ {CH3CH2CH2Cl →[alc.\ KOH][\Delta] Y →[HBr] Z} \]

Although \(+3\) oxidation state is most common in lanthanoids, cerium still shows \(+4\) oxidation state because:

Which one of the following is an ambidentate ligand?

Identify the incorrect statement from the following:

The following two reactions give the same foul smelling product \(Z\):

\[ {C2H5CONH2 →[Br2/NaOH] X} \] \[ {X →[CHCl3/alcoholic\ KOH][\Delta] Z} \] \(X\) and \(Z\), respectively, are:

Match List-I with List-II.

List-I	Molecule
A	C₂H₄
B	C₂H₂
C	CH₄
D	NH₃

List-II	Bonding feature
I	1σ bond, 2π bonds
II	3σ bonds, 1 lone pair
III	4σ bonds
IV	1σ bond, 1π bond

Compound \(P\) gives a red-orange precipitate with 2,4-DNP reagent and does not reduce Fehling's reagent. On drastic oxidation with chromic acid, \(P\) gives an aromatic product \(Q\) which produces effervescence on treating with aqueous \(\ce{NaHCO3}\). Compounds \(P\) and \(Q\), respectively, are:

Methane reacts with steam at \(1273K\) in the presence of nickel catalyst to form:

A bulb is rated at \(150\ watt\), converting \(8%\) energy into light. If energy of one photon is \(4.42\times10^{-19}J\), how many photons are emitted by the bulb per second?

The correct IUPAC name of the following compound is: \[ {CH3-CH2-CH(CH3)-CH2-CH(CH3)-CH2-CH3} \]

Match List-I with List-II.

List-I	Order of reaction
A	Zero order
B	First order
C	Second order
D	Third order

List-II	Unit of rate constant
I	mol⁻¹ L s⁻¹
II	mol⁻² L² s⁻¹
III	s⁻¹
IV	mol L⁻¹ s⁻¹

Match List-I with List-II.

List-I	Complex
A	[Pt(NH₃)₂Cl₂]
B	[Co(en)₃]Cl₃
C	[Co(NH₃)₅NO₂]Cl₂
D	[Cr(H₂O)₆]Cl₃

List-II	Type of isomerism
I	Optical
II	Solvate
III	Geometrical
IV	Linkage

The pair of molecules that are isomers among the following is:

The correct statement with regard to the secondary structure of DNA/RNA is:

In a qualitative analysis, \(Bi^{3+}\) is detected by appearance of precipitate of \(BiO(OH)\). Calculate pH when the following equilibrium exists at \(298K\): \[ BiO(OH)(s)\rightleftharpoons BiO^+(aq)+OH^-(aq) \] \[ K=4\times10^{-10} \] \[ \text{Given: }\log2=0.3010 \]

Match List-I with List-II. List-I contains quantum numbers and List-II contains orbitals.

List-I	n	l
A	2	1
B	4	0
C	5	3
D	3	2

List-II	Orbital
I	3d
II	2p
III	4s
IV	5f

Consider the following reaction: \[ 2A(g)+B(g)\rightarrow 2D(g) \] \[ \Delta U^\circ=-10\ kJ\ mol^{-1} \] \[ \Delta S^\circ=-44\ J\ K^{-1}mol^{-1} \] at \(298K\). Identify the correct option with \(\Delta G^\circ\) for the reaction and spontaneity of the reaction at \(298K\). \[ R=8.31\ J\ mol^{-1}K^{-1} \]

Match List-I with List-II.

List-I	Transition metal/compound
A	V₂O₅
B	Fe
C	PdCl₂
D	Ni complex

List-II	Catalytic role
I	Preparation of ammonia from N₂/H₂ mixture
II	Polymerisation of alkynes
III	Oxidation of SO₂ to SO₃
IV	Preparation of ethyne to ethene

Select the reagents that reduce nitriles to primary amines: \[ \text{A. } LiAlH_4 \] \[ \text{B. } Sn+HCl \] \[ \text{C. } H_2-Ni \] \[ \text{D. } Na(Hg)/C_2H_5OH \] \[ \text{E. } Br_2/aq.\ NaOH \]

एक बल्ब 150 watt निर्धारित है और यह 8% ऊर्जा प्रकाश में परिवर्तित करता है। यदि एक फ़ोटॉन की ऊर्जा \( 4.42 \times 10^{-19} \) J हो, तो बल्ब से प्रति सेकंड कितने फ़ोटॉन उत्सर्जित होते हैं?

निम्नलिखित दो अभिक्रियाएँ एक ही दुर्गंधयुक्त उत्पाद Z देती हैं।
Reaction 1: C\(_2\)H\(_5\)Cl \(\xrightarrow{X}\) Z
Reaction 2: C\(_2\)H\(_5\)NH\(_2\) \(\xrightarrow{Br_2, NaOH}\) Y \(\xrightarrow{CHCl_3/\text{एथेनॉली } KOH, \Delta}\) Z
X और Z, क्रमशः हैं:

नीचे दिए गए अर्ध सेल का वि.वा. बल (emf) परिकलित कीजिए:

निम्नलिखित विकल्पों में से \( \text{CIF}_3 \) के बारे में सही कथन पहचानिए :