List of top Chemistry Questions

In the reaction: \[ N_2 (g) + 3H_2 (g) \rightarrow 2NH_3 (g) \] The rate of disappearance of H\(_2\) is 0.02 M/s. The rate of appearance of NH\(_3\) is:

Enthalpy of fusion and enthalpy of vaporization for water respectively are 6.01 kJ mol\(^{-1}\) and 45.07 kJ mol\(^{-1}\) at 0°C. What is enthalpy of sublimation at 0°C?

In resonance hybrid of ozone molecule, O-O bond length is

The P-P-P bond angle in white phosphorus is

In the reaction: \[ 2 \text{KClO}_3 (s) \rightarrow 2 \text{KCl} (s) + 3 \text{O}_2 (g) \quad \Delta H = -78 \, \text{kJ} \] If 33.6 L of oxygen gas is liberated at S.T.P., what is the mass of KClO\(_3\) produced?

Which of the following statement is NOT correct about solution?

Which of the following changes will cause an increase in vapor pressure of 1 molal aqueous KI solution at the same temperature?

Identify the decreasing order of boiling point of alkanes (i) n-pentane (ii) Isopentane (iii) Neopentane

Methoxy ethane on reaction with hot concentrated HI gives

When alkyl halide is boiled with large excess of alcoholic ammonia it forms

Which of the following oxyacid of sulfur contains S=S linkage?

Which of the following is a character of catalyst?

Which of the following pairs of solution is isotonic?
(Molar mass of urea = 60, sucrose = 342 g mol\(^{-1}\))

Which among the following compounds is treated with benzonitrile to obtain benzophenone in dry ether and then acid hydrolysis?

For the following reaction, the relation between \( \Delta H \) and \( \Delta U \) is
\[ \text{2SO}_3(\text{g}) + \text{O}_2(\text{g}) \rightarrow \text{2SO}_3(\text{g}) \]

An element crystallizes in bcc type of unit cell having atomic radius \( 1.33 \times 10^{-8} \) cm, the edge length of unit cell will be

Which among the following group -15 elements forms hydrogen bonding in its hydride compounds?

Identify the product C in the following reaction.
\[ \text{CH\(_3\)CH\(_2\)COOH} \xrightarrow{\text{NaOH}} A \xrightarrow{\text{CaO, }\Delta} B \xrightarrow{\text{HNO\(_3\)}} C \]

0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf of water is 1.86 K kg mol⁻¹, the lowering in freezing point of solution is

Identify product ‘A’ in the following reaction.
\[ \text{R - C} \equiv \text{N} \xrightarrow{\text{DIBAL-H}} \xrightarrow{\text{H}_3\text{O}^+} A \]

An element crystallizes in bcc type of unit cell, the density and edge length of unit cell is 4 g cm\(^{-3}\) and 500 pm respectively. What is the atomic mass of an element?

Which polymer is obtained from monomers 3-Hydroxy butanoic acid and 3-Hydroxy pentanoic acid?

What is the number of moles and total number of atoms respectively present in 5.6 cm\(^3\) of ammonia gas at STP?

In aqueous phase the order of basic strength of alkylamine is

Identify the compound A and B in the following reaction.
\[ \text{CH}_3\text{Cl} + \text{KCN (alc)} \xrightarrow{\Delta} A + 2\text{H}_2\text{O} + \text{HCl} \rightarrow B + \text{NH}_4\text{Cl} \]