NEET 2026

Given below are certain reactions. Identify the reaction for which $K_P \neq K_C$.

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Given below is an expression for the rate constant of a first-order reaction occurring at a certain temperature, $\mathrm{T}(\mathrm{K})$.
\(\operatorname{lnk}=14.34-\frac{1.25 \times 10^4}{T}\)
The energy of activation in $\mathrm{kcal} ...

For a certain reaction $R \rightarrow$ Product, the plot of concentration $[R]$ vs time has a negative slope as shown. The order of reaction is :

Which one of the following is an ambidentate ligand?

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

The calculated 'spin-only' magnetic moment $\mathrm{Ti}^{2+}\left(3 \mathrm{~d}^2\right)$ is :

A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is :
(Given : Molar mass of $\mathrm{Cu}=63 \mathrm{~g} \mathrm{~mol}^{-1}$;
$$ \left.1 \mathrm{~F}=96487 \m...

Calculate emf of the half cell given below :
$$ \begin{aligned} & \mathrm{Pt}(\mathrm{~s})\left|\mathrm{H}_2(\mathrm{~g}, 2 \mathrm{~atm})\right| \mathrm{HCl}(\mathrm{aq}, 0.02 \mathrm{M}) \\ & \mathrm{E}_{\mathrm{H}_2 / \mathrm{H}^{+}}^{\c...

The number of chlorine atoms present in the organic products $X$ and $Y$ of the following reactions, respectively, are :

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

In a qualitative analysis, $\mathrm{Bi}^{3+}$ is detected by appearance of precipitate of $\mathrm{BiO}(\mathrm{OH})(\mathrm{s})$. Calculate pH when the following equilibrium exists at 298 K .
$$ \mathrm{BiO}(\mathrm{OH})(\mathrm{s}) \right...

At 298 K , a certain buffer solution contains equal concentrations of $\mathrm{X}^{-}$and $\mathrm{HX}, \mathrm{K}_{\mathrm{b}}$ for $\mathrm{X}^{-}$is $10^{-10}$. What is the pH of this buffer solution?

Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline pH close to the equivalence point during this titration is:...

Select the reagents that reduce nitriles to primary amines.
A. (i) $\mathrm{LiAlH}_4$; (ii) $\mathrm{H}_2 \mathrm{O}$
B. $\mathrm{Sn}+\mathrm{HCl}$
C. $\mathrm{H}_2 / \mathrm{Ni}$
D. $\mathrm{Na}(\mathrm{Hg}) / \mathrm{C}_2 \mathrm{H}_5 \ma...

\(\text { Two products } X \text { and } Y \text { are formed in the following reaction sequence. }\)
The suitable method that can be used for the separation of products X and Y is :

The major product Z formed in the following sequence of reactions is

$$ \begin{aligned} &\text { The following two reactions give the same foul smelling product } Z \text {. }\\ &\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl} \xrightarrow{\mathrm{X}} \mathrm{Z} \end{aligned} $$

$X$ and $Z$, respectively, are :

Identify the incorrect statement from the following:

Identify the incorrect statement from the following:

The correct order of increasing metallic character of $\mathrm{Na}, \mathrm{Be}, \mathrm{P}, \mathrm{Mg}$ and Si is

Identify the incorrect statement from the following :

Identify the correct statements :
(A) The molality of 2.5 g of ethanoic acid (Molar mass : $60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in 75 g of benzene solution is 0.556 m .
(B) The molarity of a solution containing 5 g of NaOH (molar mass : $4...

Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to :

When $1 \mathrm{dm}^3$ of CO2 gas is passed over hot coke the volume of gaseous mixture after complete reaction at STP becomes $1.4 \mathrm{dm}^3$. The composition of the gaseous mixture at STP is :

The number of hydrogen atoms present in 5.4 g of urea is:
(Given: Molar mass of urea : $60 \mathrm{~g} \mathrm{~mol}^{-1}$
$\mathrm{N}_{\mathrm{A}}: 6.022 \times 10^{23}$ particles $\mathrm{mol}^{-1}$ )

During Lassaigne's test, the elements present in an organic compound are converted from :

\(\text { The correct IUPAC name of the following compound is : }\)

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A bulb is rated at 150 watt, converting $8 \%$ energy into light. If energy of one photon is $4.42 \times 10^{-19} \mathrm{~J}$, how many photons are emitted by the bulb per second?

Consider the following reaction :
$$ \begin{aligned} & 2 \mathrm{~A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow 2 \mathrm{D}(\mathrm{~g}) \\ & \Delta \mathrm{U}^{\ominus}=-10 \mathrm{~kJ} \mathrm{~mol}^{-1} \text { and } \Delta \mathr...

At a certain temperature, $\mathrm{T}(\mathrm{K})$, during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :

An ac circuit contains a resistance of $1 \mathrm{k} \Omega$, a capacitor of $0.1 \mu \mathrm{~F}$ and an inductor of 1 mH connected in series. The resonance frequency of the circuit is approximately:

The peak value of an alternating current is 5 A and frequency is 60 Hz . How long will the current, starting from zero, take to reach the peak value?

In the first excited state of hydrogen atom, the energy of its electron is -3.4 eV . The radial distance of the electron from the hydrogen nucleus in this case is approximately:
(Take $1 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}, \mathrm{...

Four statements are given ( $A$ is mass number):
A. The volume of a nucleus is proportional to $A^{1 / 3}$.
B. The volume of a nucleus is proportional to $A$.
C. The difference in mass of an atom and its nucleus is called the mass defect.
D...

An unknown nucleus has a nuclear density of $2.29 \times 10^{17} \mathrm{~kg} / \mathrm{m}^3$ and mass of $19.926 \times 10^{-27} \mathrm{~kg}$. Its mass number $A$ is approximately:
(Take $R_0=1.2 \times 10^{-15} \mathrm{~m}, 4 \pi=12.56$ ...

Consider two uncharged capacitors of equal capacitance 200 pF . One of them is charged by a 100 V supply and disconnected. Now this capacitor is connected to the uncharged capacitor. The amount of electrostatic energy lost in the process is...

Five capacitors of capacitances
$C_1=C_2=C_3=C_4=10 \mu \mathrm{~F}$ and $C_5=2.5 \mu \mathrm{~F}$ are connected as shown, along with a battery of 50 V .
The equivalent capacitance and the charges on each capacitor respectively are:

A room heater is rated $400 \mathrm{~W}, 220 \mathrm{~V}$. If the supply voltage drops to 200 V , what will be the power consumed (approximately)?

In a metre bridge experiment (see figure), the positions of the cell, $E$, and galvanometer, $G$, are interchanged. We shall observe in the galvanometer:

A resistor is connected to a battery of 12 V emf and internal resistance $2 \Omega$. If the current in the circuit is 0.6 A , the terminal voltage of the battery is:

A galvanometer of resistance $100 \Omega$ gives full scale deflection for a current of 1 mA . It is converted into an ammeter of range $0-10 \mathrm{~A}$. The shunt required is:

A uniform metallic wire having resistance $4 \Omega$ is bent to form a square loop (ABCD) (see figure). A resistance of $2 \Omega$ is connected between points $B$ and $D$ and a battery of 2 V is connected across points $A$ and $C$ as shown ...

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For a metal of work function 6.6 eV , which of the following wavelengths of incident radiation does not give rise to the photoelectric effect?
(Take Planck's constant as $6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

A rectangular wire loop of sides 8 cm and 3 cm with a small cut, is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the plane of the loop. The emf developed across the cut, if the velocity of the loop ...