HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

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

Write the reactions involved in the zone of reduction in blast furnace during extraction of iron.

In phenol carbon atom attached to -OH group undergoes -

1. SP³ hybridisation          
2. SP hybridisation
3. SP² hybridisation
4. No hybridisation

Why do interstitial compounds have higher melting points than corresponding pure metals?

Mention ‘two’ physical properties of carbolic acid.

Silica is added to roasted copper ore during smelting process to remove _______.

(A) ferrous sulphide

(B) ferrous oxide

(C) cuprous sulphide

(D) cuprous oxide

96500 coulombs correspond to the charge on how many electrons?

Explain why is Fe3+ more stable than Fe2+?

How is carbolic acid prepared from chlorobenzene?

Write chemical test to distinguish between carbolic acid and alcohol.

Draw the structure of aspirin.

The Arrhenius equation is_________________ .

(a)`k=Ae^(RT/E_a)`                                                    

(b)`A=ke^(-E_a/(RT))`

(c)`k=Ae^(-(RT)/E_a)`

(d)`k=Ae^(-E_a/(RT))`