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

Define organometallic compound.

Write the product in the following reaction:

Bromobenzene reacts with methyl bromide and sodium metal in presence of dry ether.

Write the product in the following reaction:

Chlorobenzene reacts with sodium metal in presence of dry ether.

Write the four applications of emf series.

Why is it necessary to add H₂SO₄ while preparing the solution of CuSO₄?

Why is it necessary to add H₂SO₄ while preparing the solution of CuSO₄?

What is nano material? 

What is the action of following on ethyl bromide?

silver nitrite

Write the reaction involved in sol-gel process during hydrolysis.

Among dimethylamine (pK_b = 3.27) and diethylamine (pK_b = 3.0), which one is more basic?

Draw the structure of peroxymonosulphuric acid. 

What are enzymes?

Why is it necessary to add \[\ce{H2SO4}\] while preparing the solution of \[\ce{CuSO4}\]?

Answer the following in one sentence:

Why is it necessary to add \[\ce{H2SO4}\] while preparing the solution of \[\ce{CuSO4}\]?

Answer the following in one sentence:

Why is it necessary to add \[\ce{H2 SO4}\] while preparing the solution of \[\ce{CuSO4}\]?

Why is it necessary to add \[\ce{H2SO4}\] while preparing the solution of \[\ce{CuSO4}\]?

Answer the following in one sentence:

Why is it necessary to add H₂SO₄ while preparing the solution of CuSO₄?

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

Answer the following in one sentence:

Why is it necessary to add \[\ce{H2SO4}\] while preparing the solution of \[\ce{CuSO4}\]?

Answer the following in one sentence:

Why is it necessary to add \[\ce{H2SO4}\] while preparing the solution of \[\ce{CuSO4}\]?