HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

Name and draw structure of the repeating unit in natural rubber.

Write the structure of isoprene and the polymer obtained from it.

Name and draw the structure of the repeating unit in natural rubber.

Name and draw structure of the repeating unit in natural rubber.

Write the structure of isoprene and the polymer obtained from it.

Write the structure of isoprene and the polymer obtained from it.

Name and draw structure of the repeating unit in natural rubber.

Write the structure of isoprene and the polymer obtained from it.

Complete the following reaction giving major product.

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

Write the names and chemical formulae of any one ore of zinc.

Write the names and chemical formulae of any one ore of iron.

The process of leaching alumina, using sodium carbonate is called

• Bayer's process
• Decomposition
• Cyanide process
• Hall's process

On calculating the strength of current in amperes if a charge of 840C (coulomb) passes through an electrolyte in 7 minutes, it will be

• 1
• 2
• 3
• 4

Why is Sc³⁺ colourless while Ti³⁺ coloured? (Atomic number Sc = 21, Ti =22)

What are interstitial compounds?

Identify the weakest acidic compound amongst the following

(a) p-nitrophenol                 

(b) p-chlorophenol

(c) p-cresol                         

(d) p-raminophenol

On acid hydrolysis, propane nitrile gives.

Amongst the followings, identify a copolymer?

(a) Orion                            

(b) PVC

(c) PHBV

(d) Teflon

The charge of how many coulomb is required to deposit 1.0 g of sodium metal (molar mass 23.0 g mol^-1) from sodium ions is -

1. 2098
2. 96500
3. 193000
4. 4196

What is the chemical composition of malachite?

1. CuO . CuC0₃
2. Cu(OH)₂ CuC0₃
3. CuO.Cu(OH)₂         
4. Cu₂O . Cu(OH)₂