List of top Chemistry Questions asked in NEET (UG)

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not rue ?

$ pH $ of a saturated solution of $ Ba(OH)_2 $ is $12$ . The value of solubility product $ K_({sp} )$ of $ Ba(OH)_2 $ is

Vapour pressure of chloroform ${(CHCl_3)}$ and dichloromethane ${(CH2Cl2)}$ at $25^{\circ}C$ are 200 mmHg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of ${CHCl_3}$ and 40 g of ${CH2Cl2}$ at the same temperature will be: (Molecular mass of ${CHCl_3}$ = 119.5 u and molecular mass of ${CH2Cl2 = 85 \, u}$)

The enthalpy of fusion of water is $1.435\, kcal/mol.$ The molar entropy change for the melting of ice at $0^{\circ}C$ is :

For real gases van der Waals equation is written as $\bigg( p + \frac{an^2}{V^2} \bigg) (V - nb) = nRT$ Where 'a' and 'b' are van der Waals constants . Two sets of gases are : (I)${ O2, CO2, H2}$ and $He$ (II) ${CH4, O2}$ and ${H2}$ The gases given in set-I in increasing order of 'b' and gases given in set-II in decreasing order of 'a', are arranged below. Select the correct order from the following :

The correct IUPAC name of the compound

The density of a material in $CGS$ system of units is $4\,g\,cm^3$. In a system of units in which unit of length is $10\,cm$ and unit of mass is $100\,g$. the value of density of material will be

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If $K_f$ for water is $ 1.86^{\circ} C/m$, the freezing point of the solution will be -

The complexes $[Co(NH_3)_6][Cr(CN)_6]$ and $[Cr(NH_3)_6][Co(CN)_6]$ are the examples of which type of isomerism?

The Lassaigne's extract is boiled with conc. $HNO_3$ while testing for halogens. By doing so it

$200 \,mL$ of an aqueous solution of a protein contains its $1.26\, g$. The Osmotic pressure of this solution at $300\, K$ is found to be $2.57 \times 10^{-3}$ bar. The molar mass of protein will be ($R = 0.083 \, L\, bar\, mol^{-1} \, K^{-1}$):

A bubble of air is underwater at temperature $15^{\circ}C$ and the pressure $1.5 \,bar$. If the bubble rises to the surface where the temperature is $25^{\circ}C$ and the pressure is $1.0\, bar$, what will happen to the volume of the bubble?

Of the following which one is classified as polyester polymer?

The unit of rate constant for a zero order reaction is -

For the four successive transition elements $(Cr, Mn, Fe$ and $Co)$ , the stability of $+ 2$ oxidation state will be there in which of the following order? (At. no. $Cr = 24, Mn = 25, Fe = 26,Co = 27$ )

The Van't Hoff factor $I$ for a compound which undergoes dissociation in one solvent and association in other solvent is respectively :

Standard electrode potential of three metals $X, Y $ and $Z$ are $-1.2\,V, + 0.5\,V$ and $-3.0\,V $respectively. The reducing power of these metals will be

By what factor does the average velocity of a gaseous molecule increase when the temperature (in kelvin) is doubled?

Which of the following elements is present as the impurity to the maximum extent in the pig iron?

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

A solid compound $XY$ has $NaCl$ structure. If the radius of the cation is $100\, pm$, the radius of the anion $(Y^-)$ will be -

Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

The complex, $[Pt(Py)(NH_3)Br\,Cl]$ will have how many geometrical isomers?

What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \, eV$?

Clemmensen reduction of a ketone is carried out in the presence of which of the following?