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

The chemical formula of willemite is __

(a) ZnS

(b) ZnCO₃

(c) ZnO

(d) Zn₂SiO₄

What is the action of chlorine on CS₂

Answer the following.

What is the action of chlorine on Excess NH₃.

How many faradays of electricity are required to produce 13 gram of aluminium from aluminium chloride solution? (Given: Molar mass of Al = 27.0-gram mol^–1)

Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
 in basic medium.

Write only reactions for the preparation of benzophenone from benzonitrile.

Draw the structures of chloroxylenol.

How many faradays of electricity are required to produce 6 g of Mg from MgCl₂?

Write chemical equation for the following:
Gatterman - Koch formylation

How is potassium dichromate prepared from chrome iron ore?

What is the role of the following compound- 
SiO₂ in the extraction of copper from copper pyrites?

Write chemical equation for the following :
Rosenmund reduction

How will you convert calcium acetate to acetaldehyde?

Complete the following statement by selecting the correct alternative from the choices given: 

In a face-centered cubic lattice, atom (A) occupies the comer positions and atom (B) occupies the face centre positions. If one atom of (B) is missing from one of the face-centered points, the formula of the compound is:

How much quantity of electricity in coulomb is required to deposit 1.346 × 10^-3 kg of Ag in 3.5 minutes from AgNO₃ solution?
( Given: Molar mass of Ag is 108 × 10^-3 kg mol^-1 )

Which of the following compounds of chlorine is used as refrigerant? 

What is the action of lithium aluminum hydride in the presence of ether on the following compounds? 
a. Nitroethane 
b. 2-Methyl-1-nitropropane

Give reasons for the following:

The transition metals generally form coloured compounds.

What is the effect of temperature on solubility of solids in water? Give examples.

Answer the following in one or two sentences.

Comment on the statement:

no work is involved in an expansion of gas in a vacuum.