List of top Chemistry Questions

The enthalpies of combustion of carbon and carbon monoxide are $ -393.5 $ and $ -283\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}} $ respectively. The enthalpy of formation of carbon monoxide per mol is
The volumes of two $ \text{HCl} $ solutions A(0.5 N) and B(0.1 N) to be mixed for preparing 2 L of 0.2 N HCl solution are
When 0.1 mole of an acid is added to 2 L of a buffer solution, the pH of the buffer decreases by 0.5. The buffer capacity of the solution is
Which one of the following reactions is an example of auto-catalysis?
AB is an ionic solid. If the ratio of ionic radii of $ {{\text{A}}^{\text{+}}} $ and $ {{\text{B}}^{-}} $ is 0.52, what is the coordination number of $ {{\text{B}}^{-}} $ ?
Which one of the following reactions occur at the cathode?
Unusual high boiling point of water is result of
The electronic configuration $1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{9}$ represents a
For the reaction : $ \ce{H_2 +I_2 -> 2HI} $ , the differential rate law is
Benzoylation of phenol in alkaline medium is known as
Addition of sodium acetate to $0.1 \,M$ acetic acid will cause
The $IUPAC$ name of $CH_{3}-CH=CH-C \equiv CH$ is
What volume of oxygen gas $(O_2)$ measured at $0^\circ C$ and 1 atm, is needed to bum completely 1L of propane gas $(C_3H_8)$ measured under the same conditions?
Green chemistry means such reactions which
The dissociation equilibrium of a gas $ AB_2 $ can be represented as $2 A B_2(g) \rightleftharpoons 2 A B (g) + B_2 (g) $ The degree of dissociation is $x$ and is small compared to $1$. The expression relating the degree of dissociation (x) with equilibrium constant $K_p$ and total pressure $p$ is
Which of the following are not state functions? (I) q + W (II) q (III) w (IV) H-TS
Standard free energies of formation (in kj/mol) at 298 K are -237.2, -394.4 and -8.2 for $H_2O(l),CO_2(g) $ and pentane (g), respectively. The value of $E^0_{cell} $ for the pentane-oxygen fuel cell is
If uncertainty in position and momentum are equal, then uncertainty in velocity is
Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $ H^+ $ ion concentration in the mixture?
The maximum number of molecules is present in
Difference between $S$ and $ S^{2-} $ as $ S^{2-}$ has
The major product $P$ in the following reaction is $ C{{H}_{3}}-CH=C{{H}_{2}}\xrightarrow[Peroxide]{HI}P $
In the reaction, $ {PCl_{3(g)} + Cl_{2(g)} <=> PCl_{5(g)}}$ at equilibrium
Helium is used in balloons in place of hydrogen because it is
An octahedral complex is formed when hybrid orbitals of the following type are involved