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

Answer the following.

Give two reactions showing the oxidising property of concentrated H₂SO₄.

Fluorine shows only –1 oxidation state while other halogens show –1, +1, +3, +5 and +7 oxidation states. Explain.

Answer the following.

Distinguish between rhombic sulfur and monoclinic sulfur.

How is SO₂ prepared in the laboratory from sodium sulfite?

Describe the manufacturing of H₂SO₄ by the contact process.

Choose the most correct option.

Magnetic moment of a metal complex is 5.9 B.M. Number of unpaired electrons in the complex is ______.

Answer the following

Why salts of Sc^3⊕, Ti^4⊕, V^5⊕ are colourless?

Answer the following

Explain the trends in atomic radii of d block elements.

Answer the following

Explain trends in ionisation enthalpies of d-block elements.

from the following pair would undergo S_N2 faster from the other?

from the following pair would undergo S_N2 faster from the other?

a. CH₃CH₂CH₂I      b. CH₃CH₂CH₂Cl

Complete the following reaction giving major products.

\[\ce{CH3 - CH = CH2 ->[HBr][peroxide] A ->[alc. KOH] B}\]

Complete the following reaction giving major products.

\[\begin{array}{cc}\ce{CH3 - CH = CH3 ->[Red P/Br2] A ->[Ag2O/H2O]B}\\|\phantom{.........................}\\
\ce{OH\phantom{.......................}}\end{array}\]

Complete the following reaction giving major product.

\[\begin{array}{cc}\ce{CH3\phantom{................}}\\
|\phantom{...................}\\
\ce{CH3 - C - CH2 - Cl ->[Na/dry ether] A}\\
|\phantom{...................}\\
\ce{CH3\phantom{................}}
\end{array}\]

Complete the following reaction giving major products.

Name the reagent used to bring about the following conversion.

Bromoethane to ethoxyethane

Name the reagent used to bring about the following conversion.

1-Chloropropane to 1-nitropropane

Name the reagent used to bring about the following conversion.

Ethyl bromide to ethyl isocyanide

Name the reagent used to bring about the following conversion.

Chlorobenzene to biphenyl

Arrange the following in the increasing order of boiling points.

1. 1-Bromopropane
2. 2- Bromopropane
3. 1- Bromobutane
4. 1-Bromo-2-methylpropane