List of top Chemistry Questions

During the dehydration of alcohols to alkenes by heating with conc. $H_2SO_4$, the initiating step is
The atomic number of an element $ M $ is $26R$ . How many electrons are present in the M-shell of the element in its $M^{3+}$ state?
Which one of the following reactions is called Rosemond reaction?
The raw material used in nylon-$6$ is
Which of the following is the decreasing order of boiling points of $ V $ group hydrides?
A mixture of amylose and amylopectin is called
What is the wave number of $4^{th}$ line in Balmer series of hydrogen spectrum? $(R=1,09,677\,cm^{-1})$
Disperse phase and dispersion medium in butter are respectively
Protein is a polymer of
In the decarboxylation of carboxylic acid the reagent used is
Helium molecule is monoatomic because
Heat of neutralization of any strong acid and strong base is always constant and $\Delta H= -57.3 \, kJ$. This is because
For $O_2$ molecule, molecular orbitals having lowest energy is
What is wrong about $CO_3^{2-} \, ion ?$
Consider the acidity of the carboxylic acids (i) PhCOOH (ii) $o-NO_2C_6H_4COOH$ (iii) $p-NO_2C_6H_4COOH$ (iv) $m-NO_2C_6H_4COOH$ Which of the following orders is correct?
The number of hydrogen bonds between adenine and thymine in a DNA molecule is
Which one of the following elements does not form the compound, $ {{M}_{4}}{{O}_{10}} $ (M = element)?
Diagonal relationship is not shown by
$[ CoF_6]^{3-}$ is paramagnetic. $Co^{3+}$ has $3d^6$ outer electronic configuration. The unpaired electrons do not pair up because of weak field provided by $F^-$ .
Which of the following is not true for antibiotics?
Which one of the following pairs is obtained on heating ammonium dichromate?
Which of the following expressions gives the de-Broglie relationship?
Which of the following acids has the smallest dissociation constant?
When $KI$ is added to acidified solution of sodium nitrite, then
Surface tension vanishes at