List of top Chemistry Questions

When benzene is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous aluminium chloride, benzaldehyde is formed. The reaction is known as
The reagent used for the conversion of carboxylic acids to primary alcohols is
What are X, Y, Z respectively in the following reaction sequence?
CH$_3$CH=CHCH$_3$ $\xrightarrow{X}$ CH$_3$COOH $\xrightarrow{Y}$ CH$_3$CO-Cl $\xrightarrow{Z, C6H5NH2}$ C$_6$H$_5$NHCOCH$_3$
The compound that gives iodoform test is:
Cannizzaro reaction is shown by aldehydes which:
Which of the following is an incorrect statement about the compounds of group 13 elements?
The incorrect statement about the oxidation states of group 14 elements is
Thionyl chloride on reaction with white phosphorus gives a compound of phosphorus 'C' which on hydrolysis gives an oxo acid 'O'. The correct statements about C and O are
I. Shape of 'C' is pyramidal
II. 'O' is a dibasic acid
III. 'O' is a monobasic acid
IV. 'C' on reaction with acetic acid gives 'O'
Consider the following
Assertion (A): phosphorus can form both phosphorus (III) and phosphorus (V) chlorides but nitrogen cannot form nitrogen(V) chloride.
Reason (R): The electronegativity of nitrogen is more than that of phosphorus
The correct answer is
Which one of the following statements is not correct?
Which gas is known as laughing gas?
Which acid is the strongest: HF, HCl, HBr, HI?
Oxidation numbers of oxygen in H_2O_2 and H_2O:
Which element has the smallest atomic radius among the following?
Which of the following has the highest ionization energy?
Match the following
The orbital with number of total nodes as 3 and angular nodes as 3 is
The number of d-electrons in Fe2+ (Z = 26) is not equal to:
The ratio of wavelengths of first line (\( n_2 = 3 \)) and second line (\( n_2 = 4 \)) of Balmer series of hydrogen spectrum is
The ratio of wavelengths of first line (\( n_2 = 3 \)) and second line (\( n_2 = 4 \)) of Balmer series of hydrogen spectrum is
Choose the incorrect statement from the following:

Which of the following represents the wavelength of spectral line of Balmer series of He$^+$ ion? (R = Rydberg constant, n $>$ 2)

An element has two isotopes having atomic masses 10 and 15 u, respectively. If the percent abundance of lighter isotopes is 80%, then the average atomic mass of the element is:

Observe the elements from H (Z=1) to Ca (Z=20). How many elements have no unpaired electrons in their ground state?
In Hydrogen atom, an electron jumped from an orbit of radius 2592.1 pm to another orbit of radius 211.6 pm. What is the energy difference (in J) between these two states?