HSC Science (Electronics) 11th Standard - Maharashtra State Board Question Bank Solutions

What is the difference between an α-particle and helium atom?

The half-life of ²⁴Na is 900 minutes. What is its decay constant?

How many α and β-particles are emitted in the transmutation \[\ce{^232_90Th -> ^208_82Pb}\]?

How many particles are emitted by 0.1 g of ²²⁶Ra in one year?

Find out the most stable species from the following. Justify 

`dot"CH","CH"_3-dot"CH" - "CH"_3,` \[\begin{array}{cc}\ce{CH3 -\dot{C} - CH3}\\
|\phantom{.}\\\phantom{..}\ce{CH3}\end{array}\]

Find out the most stable species from the following. Justify.

`bar"C""H"_3, bar"C""H"_2"Br", bar"C""Br"_3`

Find out the most stable species from the following. Justify.

\[\ce{\overset{+}{C}H3, \overset{+}{C}H2Cl, \overset{+}{C}Cl3}\]

Identify the α-carbons in the following species and give the total number of α-hydrogen.

\[\ce{CH_3 - CH_2 - \overset{⊕}{C}H-CH_2 - CH_3}\]

Identify the α - carbons in the following species and give the total number of α-hydrogen.

Identify the α-carbon in the following species and give the total number of α-hydrogens.

\[\ce{CH2 = CH - CH2 - CH3}\]

Draw a resonance structure of the following:

Phenol

Draw a resonance structure of the following:

Benzaldehyde

Draw a resonance structure of the following:

Buta-1,3-diene

Draw a resonance structure of the following:

Acetate ion

Choose the correct option.

Which of the following shows the most prominent inert pair effect?

Distinguish between Inductive effect and resonance effect.

Distinguish between Electrophile and nucleophile.

Distinguish between Homolysis and heterolysis.

Write true or false. Correct the false statement.

Homolytic fission involves the unsymmetrical breaking of a covalent bond.

Write true or false. Correct the false statement.

Heterolytic fission results in the formation of free radicals.