List of top Chemistry Questions

The structure of Gly-Ala (Glycylalanine) is:
The group present in prontosil is
The optically inactive compound from the following is:

Which is the correct option for the following reaction? \[ 2\,\text{CH}_3\text{CH}_2\text{Br} \xrightarrow{\text{2Na/Dry ether}} \text{?} \]

The number of products obtained in the following reaction is: Reaction:

What are 'X' and 'Y' respectively in the following reactions? \[ \text{C}_6\text{H}_5\text{CHO} + \text{C}_6\text{H}_5\text{COCH}_3 \xrightarrow{\text{OH}^-,\ 293\text{K}} \text{X} \xrightarrow{\text{NaBH}_4} \text{Y} \]

Which of the following is used in perfumery?

Arrange the following in increasing order of their boiling points:

A reaction takes 30 minutes to complete 50% of the reaction and takes 45 minutes to complete 75% of the reaction. The order of the reaction is:
The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is___. [Use, molar mass (g mol−1): H = 1, C = 12, O = 16, Si = 28, Cl = 35.5] 
50 mL of 0.2 molal urea solution (density = 1.012 g mL−1 at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is ___. 
[Use: Molar mass of urea = 60 g mol−1 ; gas constant, R = 62 L Torr K−1 mol−1; Assume, ΔmixH = 0, ΔmixV = 0]
Number of moles of $AgCl$ formed in the following reaction is
Number of moles of AgCl formed in the following reaction is
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: A reaction can have zero activation energy.
Reasons R: The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.
In the light of the above statements, choose the correct answer from the options given below:
Match List -I with List-II
List -I List-II 
ADiamagnetic solid ICrO2
BFerromagnetic solidIIFe3O4
CAntiferomagnetic solidIIINaCl
DFerrimagnetic solidIVMnO
Choose the correct answer from the option given below
Which of the following electron arrangement does not obey Hund’s rule?
The de Broglie wavelength of an electron travelling with 20% of velocity of light is
The correct order of covalent radii of Si, Ge, Sn is:
The first ionization enthalpies of Na, Mg and Si are respectively 496, 737 and 786 kJ mol−1. What would be the first ionization enthalpy of Al in kJ mol−1?

Which of the following sets is correct? 

#MoleculeHybridizationGeometryNo. of lone pairs
on central atom
I\(\mathrm{SiH_4}\)\(\mathrm{sp^3}\)tetrahedral0
II\(\mathrm{BeCl_2}\)\(\mathrm{sp^2}\)linear1
III\(\mathrm{SF_4}\)\(\mathrm{dsp^3}\)seesaw1
IV\(\mathrm{SnCl_2}\)\(\mathrm{sp^2}\)bent2
V\(\mathrm{CH_4}\)\(\mathrm{sp^3}\)tetrahedral0
Which of the following is not the property of covalent substances?
At 300 K, one mole of a gas present in a 10 L flask exerted a pressure of 2.706 atm. What is its compressibility factor (Z)?
At T (K), equal weights of H$_2$, D$_2$, and T$_2$ are present in closed vessel. The pressure exerted by this gaseous mixture is P atm. The ratio of partial pressures of T$_2$, D$_2$ and H$_2$ is approximately (H, D and T are isotopes of hydrogen).
6 g of urea (molar mass = 60 g mol$^{-1}$) and 9 g of glucose (molar mass = 180 g mol$^{-1}$) were dissolved in 35 g of water. The mass percent of urea and glucose is respectively.
If the work done by 2 mol of an ideal gas during isothermal reversible expansion from 5 L to 50 L is -189.1 L atm at constant pressure, the temperature of the gas (in °C) is
At 300 K the enthalpy change for the following reaction is -2800 kJ mol$^{-1}$ \[ C_6H_{12}O_6(s) + 6O_2(g) \rightarrow 6CO_2(g) + 6H_2O(l) \] What is the \(\Delta U\) for the same reaction at 300 K (kJ mol$^{-1}$)?