List of top Chemistry Questions asked in Maharashtra Class XII

Amongst the following 3d-series elements, having highest value of first ionization enthalpy is ________.

The pOH of 0.01 M HCl solution is ________.

Write chemical formula of epsom salt. Give two uses of \( H_2SO_4 \).

A chemical reaction occurs in two steps :
(i) \( NO_2Cl(g) \xrightarrow{\text{slow} NO_2(g) + Cl(g) }\)
(ii) \( NO_2Cl(g) + Cl(g) \xrightarrow{\text{fast}} NO_2(g) + Cl_2(g) \)
(a) Write down the rate law.
(b) Identify the reaction intermediate.

Explain the mechanism of alkaline hydrolysis of bromomethane.

Acetic acid is 5% ionised in its decimolar solution. Calculate the dissociation constant of acetic acid.

Convert, ethanoic acid to ethanol.

Draw neat and labelled diagram of lead accumulator.

Write the name of catalyst used in preparation of HDP.

Draw structure of isoprene unit of natural rubber.

Write two advantages of hydrogen - oxygen fuel cell.

Calculate effective atomic number of \( Fe^{2+} \) in \( [Fe(CN)_6]^{4-} \) [ Given : (Z = 26) ]

Define : Molecularity of reaction

Define : Schottky defect

Define : Ferromagnetism

State and explain Hess's law of constant heat summation.

Draw the structure of 2, 4 - dinitrophenylhydrazone of acetaldehyde.

The rate of A + B \(\rightarrow\) P is \(3.6 \times 10^{-2}\) mol/\(dm^3\)/s. When [A] = 0.2 M and [B] = 0.1 M. Calculate the rate constant if reaction is first order in B and second order in A.

Define : Isotonic solution

Write preparation of glucose from starch.

Write the structure of zwitter ion of sulfanilic acid. Write the reaction between benzene diazonium chloride and phenol in alkaline medium.

Define : Common ion effect.

Write Tollen's reagent test for acetaldehyde.

The salt of \(Sc^{3+}\) ion is colourless and the salt of \(Mn^{3+}\) ion is coloured. Explain. [Z of Sc = 21 and Z of Mn = 25]