List of top Chemistry Questions

$1\, mol$ of $H _{2} SO _{4}$ is mixed with $2$ moles of $NaOH$. The heat evolved will be
One mole of a perfect gas expands isothermally to ten times of its original volume. The change in entropy is
For the reaction, $N_{2}+3 H_{2} 2 N H ; \Delta H=$ ?
$4\, g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5\, g$ of its oxide. The equivalent weight of copper is :
Number of atoms of oxygen present in $10.6\, g$ of $Na _{2} CO _{3}$ will be
The correct name of the compound $\left[ Cu \left( NH _{3}\right)_{4}\right]\left( NO _{3}\right)_{2}$ according to IUPAC system is
Volume of $0.1\, M\, K _{2} Cr _{2} O _{7}$ required to oxidize $35\, mL$ of $0.5\, M\, FeSO _{4}$ solution is
Identify the correct sequence of increasing number of a bonds in the structures of the following molecules: I. $ {{H}_{2}}{{S}_{2}}{{O}_{6}} $ II. $ {{H}_{2}}S{{O}_{3}} $ III. $ {{H}_{2}}{{S}_{2}}{{O}_{5}} $
In which of the following, there are 3 bp and 2 lp?
Xenon hexaflouride reacts with silica to form a xenon compound X. The oxidation state of xenon in X is:
Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the anion of F?
100 mL of 0.015 M HCl solution is mixed "with 100 mL of 0.005 M HCl. What is the pH of the resultant solution?
An element has 2 electrons in its K-shell, 8 electrons in L-shell, 13 electrons in M-shell and one electron in N-shell. The element is:
Lattice energy of alkali metal chlorides follows the order :
What is the formula of calgon?
The formula of exhausted permutait is:
The nucleic acid base having two possible binding sites is
The metal which does not form ammonium nitrate by reaction with dilute nitric acid is :
The first excited state of hydrogen atom is 10.2 eV above its ground state. The temperature needed to excite hydrogen atoms to first excited level, is :
The energy of electron in the nth orbit of hydrogen atom is expressed as $ \sqrt{3}cm $ . The shortest and longest wavelength of Lyman series will be :
H2O is dipolar, whereas BeF2 is not. It is because
Among the following, the pair in which the two species are not isostructural is
Which one of the following can be oxidised to the corresponding carbonyl compound
Ionic radii are
The –OH group of an alcohol or the carboxylic acid can be replaced by – Cl, using