HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

What are chalcogens?

Discuss industrial method of preparation of sulfur dioxide from zinc sulfide and iron pyrites.

Zinc does NOT show variable valency because of ______.

Name the alloy which is formed from copper and tin.

Explain terms cast iron and wrought iron with their uses?

Which factors relate to the colour of transition metal?

Derive the expression for work done in chemical reaction. Write the relationship between ∆H and ∆U for an isochoric process.

The concept that aims to maximize efficiency and minimize hazardous effect on human health and environment was coined by Paul T. Anastas.

Write chemical reactions for the following conversions:

Ethyl bromide to ethene.

On which electrode the oxidation reaction takes place?

The allylic halide, among the following, is ______.

Write the chemical composition of cryolite.

Mention two important functions of nucleic acids.

Complete the following reaction giving major product.

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

Identify the chiral molecule from the following.

CH₂OH-CO-(CHOH)₄-CH₂OH is an example of ______.

Identify the chiral molecule from the following.

Self-cleansing windows are example of the ______.

In the reaction A + 3B → 2C, the rate of formation of C is ______.

Explain why the anode is of negative polarity in a galvanic cell.