List of top Chemistry Questions asked in NEET (UG)

At $298K$, a certain buffer solution contains equal concentrations of $X^-$ and $HX$. If $K_b$ for $X^-$ is $10^{-10}$, what is the pH of this buffer solution?

The correct order of increasing metallic character of $Na$, $Be$, $Mg$, $Si$ and $P$ is:

The number of chlorine atoms present in the organic products $X$ and $Y$ of the following reactions respectively are: \[ {C6H6 + Cl2 →[Anhyd. AlCl3][dark] X} \] \[ {C6H6 + 3Cl2 →[500K] Y} \]

Given below are the reactions. Identify the reaction for which $K_p<K_c$:

Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature $T(K)$: \[ \ln k = 14.34-\frac{1.25\times10^4}{T} \] Given $R=1.987\text{ cal mol}^{-1}\text{K}^{-1}$. The activation energy of the reaction is:

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

$$ {C2H5Cl →[AgNO2] X →[Sn/HCl] Y →[(i)\ NaNO2][(ii)\ HCl,\ H2O] Z} $$

When $1\ dm^3$ of $CO_2$ gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes $1.4\ dm^3$. The composition of the gaseous mixture at STP is:

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

The correct formal charges on oxygen atoms numbered $2,1$ and $3$, respectively, are:

Identify the incorrect statement from the following:

The calculated spin-only magnetic moment of $Ti^{2+}$ is:

Calculate emf of the half-cell given below: \[ Pt(s)\mid H_2(g,2\text{ atm})\mid HCl(aq,0.02M) \] \[ E^\circ_{H^+/H_2}=0V,\qquad \frac{2.303RT}{F}=0.059 \] \[ \log 2=0.3010 \]

In a test tube containing a salt, a few drops of dilute ${H2SO4}$ was added, which gave colourless vapours having the smell of vinegar. The vapours turned blue litmus paper red. Identify the correct anion from the following.

Identify the correct statement about $ClF_3$.

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

At a certain temperature $K$, 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:

A solution of copper sulphate is electrolysed for $10$ minutes with a current of $1.5$ ampere. The mass of copper deposited at the cathode is: \[ \text{Given: Molar mass of Cu}=63.5\text{ g mol}^{-1} \] \[ F=96487\text{ C mol}^{-1} \]

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

The suitable method that can be used for separation of products $X$ and $Y$ is: \[ {C6H6 →[CH3Cl/Anhyd. AlCl3] X →[dil. HNO3/H2SO4] X + Y} \]

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: