List of practice Questions

Which of the following reactions is used to prepare isobutane?

The concentrations of the reactant A in the reaction \( A \rightarrow B \) at different times are given below Concentration (M) \quad Time (Minutes) \[ 0.069 \quad 0 \quad 0.052 \quad 17 \quad 0.035 \quad 34 \quad 0.018 \quad 51 \] The rate constant of the reaction according to the correct order of reaction is

The ratio of slopes of \( K_{\text{max}} \) vs \( V \) and \( V_0 \) vs \( v \) curves in the photoelectric effect gives

With excess of water, both \( P_2O_5 \) and \( PCl_5 \) give

The dissolution of \( Al(OH)_3 \) by a solution of NaOH results in the formation of

Which of the following does not exist?

If the ionisation energy and electron affinity of an element are 275 and 86 kcal/mol respectively, then the electronegativity of the element on the Mulliken scale is

For the preparation of paracetamol

Point out incorrect stability order

Consider the following changes: \[ M(s) \xrightarrow{} M(g) \quad (1)
M(g) \xrightarrow{} M^{2+}(g) + 2e^- \quad (2)
M(g) \xrightarrow{} M^+(g) + e^- \quad (3)
M^+(g) \xrightarrow{} M^{2+}(g) + e^- \quad (4) \] The second ionisation energy of \( M \) could be determined from the energy values associated with

In benzene, the triple bond consists of

In keto-enol tautomerism of dicarbonyl compounds, the enol-form is preferred in contrast to the keto-form, this is due to

An organic compound having carbon, hydrogen and sulphur contains 4% of sulphur. The minimum molecular weight of the compound is

Which one of the following is a case of negative adsorption?

The false statements among the following are I. A primary carbocation is less stable than a tertiary carbocation.
II. A secondary propyl carbocation is less stable than allyl carbocation.
III. A tertiary free radical is more stable than a primary free radical.
IV. Isopropyl carbocation is more stable than ethyl carbocation.

A colourless water soluble solid \( A \) on heating gives equimolar quantities of \( B \) and \( C \). B gives dense white fumes with HCl and C does so with NH\(_3\). B gives brown precipitate with Nessler’s reagent and C gives white precipitate with nitrates of \( Ag^+ \), \( Pb^{2+} \) and Hg\(^{2+} \). A is

The IUPAC name of

Caffeine has a molecular weight of 194.1 g/l. It contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

A compound \( X \) on heating gives a colourless gas. The residue is dissolved in water to obtain \( Y \). Excess \( CO_2 \) is passed through aqueous solution of \( Y \) when \( Z \) is formed. \( Z \) on gentle heating gives back \( X \). The compound \( X \) is

Which two sets of reactants best represent the amphoteric character of \( Zn(OH)_2 \)? Set I \( Zn(OH)_2(s) \) and \( OH^-(aq) \)
Set II \( Zn(OH)_2(s) \) and \( H_2O(l) \)
Set III \( Zn(OH)_2(s) \) and \( H^+(aq) \)
Set IV \( Zn(OH)_2(s) \) and \( NH_3(aq) \)

A and B respectively are

The molarity of \( NO_3^- \) in the solution after 2L of 3M \( AgNO_3 \) is mixed with 3L of 1M BaCl2 is

Amongst \( NO_3^- \), \( SO_3^{2-} \), \( CO_3^{2-} \), \( SO_4^{2-} \) the non-planar species are

A and B respectively are

A certain metal when irradiated by light (\( r = 3.2 \times 10^{16} \, \text{Hz} \)) emits photoelectrons with twice kinetic energy as did photoelectrons when the same metal is irradiated by light (\( r = 2.0 \times 10^{16} \, \text{Hz} \)). The \( \nu \) of metal is