List of top Chemistry Questions

Galena is an ore of

Froth floatation process of concentration is based on the

Froth floatation process for the concentration of ores is an illustration of the practical application of

Freons are not recommended to be used in refrigerators because they

Freon is used as a

Freon-12 is used as a

$BF_3$ acts as an acid according to the concept of

Four one litre flasks are separately filled with the $O_2\,F_2,CH_4 \, and \, CO_2$ under the same conditions. The ratio of number of molecules inthese gases are

Four moles of electrons were transferred from anode to cathode in an experiment on electrolysis of water. The total volume of the two gases(dry and at STP) produced will be approximately(in litres)

Formyl chloride has not been prepared so far. Which of the following can function as formyl chloride in formylation ?

Formation of ammonia is shown by the reaction, $N_{2\left(g\right)}+3H_{2\left(g\right)} \to 2NH_{3\left(g\right)}$; $\Delta_{r}H^{\circ} = -91.8\,kJ\,mol^{-1}$ What will be the enthalpy of reaction for the decomposition of $NH_3$ according to the reaction? $2NH_{3\left(g\right)}\to N_{2\left(g\right)} + 3H_{2\left(g\right)}; \Delta_{r}H^{\circ} = ?$

Formic acid is not a representative member of the carboxylic acids because

Formaldehyde when treated with KOH gives methanol and potassium formate. The reaction is known as

For which ore of the metal, froth floatation method is used for concentration ?

For which of the following ores froth floatation method is used for concentration?

For two ionic solids CaO and KI, identify the wrong statement amongst the following :

For the reaction, $ {CaCO_{3(g)}<=>CaO_{(s)} +CO_{2(g)}}$ partial pressure of $CO_2$ at $1000\, K$ is $0.003$ atm. $?G^? = 27.2\, kcal$. Calculate the value of $?G.$

For the reaction $ {CO(g) + \frac{1}{2} O_2 (g) -> CO_2 (g)}$ Which one of the statement is correct at constant T and P ?

For the isolation of inert gases from air, the nitrogen and oxygen present are removed bypassing air over heated

For the compounds $ {CH3Cl, CH3Br, CH3I }$ and $ {CH3F}$, the correct order of increasing C-halogen bond length is:

For the equilibrium reaction, the value of Gibbs free energy change is

For real gases, the relation between $P$, $V$ and $T$ is given by van der Waals equation, $\left(P+\frac{an^{2}}{V^{2}}\right) \left(V-nb\right)=nRT$. For the following gases $CH_4$, $CO_2$, $O_2$ $H_2$ which gas will have (i) highest value of $a$ (ii) lowest value of $b$ ?

For tetrahedral co-ordination the radius ratio $(r^+ /r^-)$ should be

For particles having same K.E., the de-Broglie wavelength is

For n moles of ideal gas,the equation of state maybe written as