List of top Chemistry Questions

For a first order reaction \( A \rightarrow P \), the temperature \( (T) \) dependent rate constant \( k \) was found to follow the equation \[ \log k = -\frac{2000}{T} + 6.0 \] The pre-exponential factor \( A \) and the activation energy \( E_a \) respectively, are

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be

The exothermic formation of \( \text{ClF}_3 \) is represented by the equation: \[ \text{Cl}_2(g) + 3\text{F}_2(g) \rightarrow 2\text{ClF}_3(g); \Delta H = -329 \, \text{kJ} \] Which of the following will increase the quantity of \( \text{ClF}_3 \) in an equilibrium mixture of \( \text{Cl}_2 \), \( \text{F}_2 \), and \( \text{ClF}_3 \)?

A compound \( M X \) has cubic close packing (ccp) arrangement of \( X \). Its unit cell structure is shown below. The empirical formula of the compound is

For the reaction \[ 2\text{NO}_2(g) \rightarrow 2\text{NO}(g) + \text{O}_2(g); K_c = 1.8 \times 10^{-4} \text{at } 184^\circ C \] When \( K_p \) and \( K_c \) are compared at 184°C, it is found that

Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus?

What is X in the following reaction?

What is Z in the following sequence of reactions? \[ \text{Phenol} \xrightarrow{\text{Zn dust}} \text{CH}_6 \xrightarrow{\text{Alkaline KMnO}_4} Z \]

The cyclobutyl methylene with nitrous acid gives

Schottky defect in crystals is observed when

Osmotic pressure is a colligative property because it

The correct statement regarding electrophile is :

Aquaregia contains 3 parts of concentrated HCl and ____.

When Magnesium (Mg) burn in air, we get Magnesium ____ .

The average energy of a diatomic gaseous molecule at temperature T is $\frac{5}{2} k_B T$. The average energy per degree of freedom is

A straight line having a slope of $-\Delta U^{0}/R$ is obtained in a plot between