List of top Chemistry Questions

The entropy of vaporization of a liquid is $58 \, JK^{-1} \,mol^{-1}$. If $100\, g$ of its vapour condenses at its boiling point of $123^{\circ}C$, the value of entropy change for the process is (Molar mass of the liquid = $58 \,g \,mol^{-1})$

Green chemistry deals with

According to MO theory,

The sugar moiety present in $RNA$ molecule is

Novlac, the linear polymer used in paints is

Wood spirit is known as

The smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is known as

How much is the $pH$ of human blood?

What is the unit of zero order reaction?

How many octahedral void(s) are present per atom in a cubic close - packed structure?

For the reaction:
\(X_2O4(l) → 2XO_2(g)\)
△U = 2.1 k cal, △S = 20 cal K^–l at 300 K.
Hence △G is

Using the Gibbs energy change, \(△G° = + 63.3\  kJ\), for the following reaction,
\(Ag_2CO_3 (g) ⇋ 2Ag+ (aq) + CO_3^{2–} (aq)\)
the \(K_{sp}\) of \(Ag_2CO_3 \)(s) in water at \(25°C\) is :
\((R = 8.314\ J K^{–1} mol^{–1})\)

Which of the following will not be soluble in sodiumhydrogen carbonate?

In the following reaction, the product (A) is :

Identify \(Z\) in the sequence of reactions:
\(CH_3CH_2CH=CH_2  \xrightarrow{HBr/H_2O_2}Y \xrightarrow{C_2H_5ONa}Z\)

Which of the following will be most stable diazonium salt $(R\, N^{+}_{2}\,X^{-})$ ?

Which property of colloids is not dependent on the charge on colloidal particles?

Which of the following will not be soluble in sodium hydrogen carbonate?

Energy of one mole of photons of radiation whose frequency is $ 5\times 10^{14}\,Hz $ is

A crystalline solid $X$ reacts with $dil. HCl$ to liberate a gas $Y.Y$ decolourises acidified $KMnO_4$. When a gas $'Z'$ is slowly passed into an aqueous solution of $Y$, colloidal sulphur is obtained. $X$ and $Z$ could be, respectively

A metallic oxide reacts with water to form its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be

When $2$-bromopentane is heated with alcoholic solution of potassium hydroxide, the major product obtained is

The radius of an atom is $300\,pm$. If it crystallizes in a face-centered cubic lattice, length of the edge of the unit cell is

The unstable intermediate dichlorocarbene $ {[:CCl_2]}$ is formed during

A 150 watt bulb emits light of wavelength 6600 $?$ and only 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?