HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

Write the correct order of increasing ease of dehydrohalogenation.

\[\ce{\underset{\text{(I)}}{CH3 - CH2 - CH2 - Cl}}\]

\[\ce{\underset{\text{(II)}}{CH3 - CH(Cl) - CH3}}\]

\[\begin{array}{cc}
\ce{CH3}\\
|\\
\ce{CH3-C-Cl}\phantom{...}\\
|\\
\ce{CH3}\\
\ce{(III)}
\end{array}\]

Explain. Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions.

The number of tetrahedral voids are formed if the number of atoms in a crystal is N/2.

Explain primary benzylic halide shows higher reactivity by S_N1 mechanism than other primary alkyl halide.

The number of octahedral voids formed in 0.5 mol of a compound forming hcp structure?

Explain the factors affecting S_N1 and S_N2 mechanism.

Explain aqueous alkaline hydrolysis of tert. butyl bromide.

The colligative properties of solutions _______.

What is dehydrohalogenation? State the rule for the formation of the preferred product of dehydrohalogenation.

Which of the following pair of reagent is used for conversion of carboxylic acid to alcohol?

What is the pOH if the hydrogen ion concentration in solution is 1 × 10^–3 mol dm^–3?

Calculate the pOH of 10^-8 M of HCl.

Calculate the pH and pOH of 0.0001 M HCl solution.

Compound ‘A’ with molecular formula C₆H₅Cl is fused with NaOH at high temperature under pressure to give compound ‘B’. Compound ‘B’ on treatment with dil.HCl gives compound C having characteristic carbolic odour. Write the chemical equations in support of this. Name the process and give uses of compound C.

Define pOH.

Derive the equation p^H + p^OH = 14.

The work done in vacuum when 300 m mole of an ideal gas expands until its volume is increased by 2.3 dm³ at 1 bar pressure is ______ mole.

The change in internal energy in a reaction when 2kJ of heat is released by the system and 6 kJ of work is done on the system will be ______.

Calculate `"E"_"cell"^0` for galvanic cell with electrodes Co/Co³⁺// Mn²⁺/Mn. 
`"E"_"Mn"^0` = - 1.18 V, `"E"_"Co"^0` = 1.82 V.

Give the chemical composition present in the salt bridge.