List of top Chemistry Questions asked in NEET (UG)

If the rate constant for a first order reaction is k the time (t) required for the completion of 99% of the reaction is given by:

For an ideal solution, the correct option is:

For a cell involving one electron \(E^\ominus cell=0.59V\) at 298 K, the equilibrium constant for the cell reaction is: [Given that \(\frac{ 2.303 RT }{F}\) \(=0.059 V\) at\( T 298 K \)] 

Match LIST I with LIST II

LIST I		LIST II
A	Pure nitrogen	I	Chlorine
B	Haber process	II	Sulphuric acid
C	Contact process	III	Ammonia
D	Deacon's process	IV	Sodium azide or Barium azide

Which of the following is the correct option?

The most suitable reagent for the following conversion, is:

The structure of intermediate A in the following reaction, is;

In which case change in entropy is negative? (1)(2) (3 (4)

The number of \(\sigma \)and \(\pi\) bonds in pent-2-en-4-yne is: 

Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]I- Sol.? (

Which of the following is incorrect statement?

The major product of the following reaction is:

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant externalpressureof2bar Theworkdonebythe gas i s : [Given that 1Lbar= 100J)

Formula of nickel oxide with metal deficiency defect in its crystal is $A_{0.8}O$. The crystal contains $A^{2+}$ and $A^{3+}$ ions. The fraction of nickel existing as $A^{2+}$ ions in the crystal is

The rate of radioactive disintegration at an instant for a radioactive same of half life $2.2 \times 10^9\,s^{-1}$ is $10^{10} \,s^{-1}$. The number of radioactive atoms in that sample at that instant is,

Iron carbonyl, $Fe(CO)_5$ is

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether. A, B and C are in the order

A mixture of $2.3 \,g$ formic acid and $4.5 \,g$ oxalic acid is treated with cone. $H_2SO_4$. The evolved gaseous mixture is passed through $KOH$ pellets. Weight (in $g$ ) of the remaining product at $STP$ will be

The geometry and magnetic behaviour of the complex $[Ni(CO)_4]$ are

The type of isomerism shown by the complex $[CoCl_2(en)_2]$ is

The solubility of $BaSO _{4}$ in water is $2.42 \times 10^{-3}\, gL ^{-1}$ at $298 \,K$. The value of its solubility product $\left( K _{ sp }\right)$ will be (Given molar mass of $BaSO _{4}=233 \,g\, mol ^{-1}$ )

Given van der Waals constant for $NH _{3}, H _{2}, O _{2}$ and $CO _{2}$ are respectively $4.17, 0.244, 1.36$ and $3.59$, which one of the following gases is most easily liquefied?

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : is Then the species undergoing disproportionation is

Consider the following species : $CN^{+} , CN^{-} , NO $ and $CN$ Which one of these will have the highest bond order ?

Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

In the structure of \({ClF_3}\), the number of lone pairs of electrons on the central atom \(Cl\) is: