List of top Questions asked in Maharashtra Board Class XII Exam

Write the chemical reaction for the preparation of Polyacrylonitrile.
Define: Nanoscience
Write the Atomic Numbers of Transuranium Elements.
What are Enzymes?
Isobaric and Adiabatic Processes
Extensive and Intensive Properties

Anisole to Phenol. Write two uses of neon.

Acetaldehyde to Isopropyl Alcohol
Cumene to Phenol

Convert the following: 
(i) acetaldehyde to isopropyl alcohol. 
(ii) cumene to phenol. 
(iii) anisole to phenol. Write two uses of neon.

Write the preparation of potassium dichromate from chromite ore.
Define acids and bases according to Bronsted-Lowry theory. Derive the relationship between pH and pOH.
Identify ‘A’, ‘B’ and ‘C’ in the following chain reaction and rewrite the chemical reactions: \[ CH_3CH_2OH \xrightarrow{\text{red P}, \, Br_2} A \xrightarrow{\text{KCN, alc.}} B \xrightarrow{\text{LiAlH}_4, \text{Ether}} C \]
Define the electrochemical series and write its two applications.
Write postulates of Werner’s theory of coordination complexes. Write the name of a hexadentate ligand.
Explain Wolff-Kishner reduction reaction. Write the preparation of propanone by using ethanoyl chloride and dimethyl cadmium.

HF, HCl, HBr, HI (thermal stability)

MF, MCl, MBr, MI (ionic character)
\(\text{HClO}, \text{HClO}_2, \text{HClO}_3, \text{HClO}_4\) (acidic strength)

Arrange the following in the increasing order of the property mentioned:

(i) HClO, HClO₂, HClO₃, HClO₄ (acidic strength)

(ii) MF, MCl, MBr, MI (ionic character)

(iii) HF, HCl, HBr, HI (thermal stability)

For the reaction \( A + B \rightarrow P \):
If \( [B] \) is doubled at constant \( [A] \), the rate of reaction doubles.
If \( [A] \) is tripled and \( [B] \) is doubled, the rate of reaction increases by a factor of 6.
Calculate the rate law equation.
Alcoholic Sodium Hydroxide
Magnesium in Dry Ether
Silver Nitrite

What is the action of the following on ethyl bromide ?
(a) silver nitrite
(b) Mg in dry ether 
(c) alcoholic sodium hydroxide