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

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 reason 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.

Answer in brief.

Derive the expression for PV work.

Answer the following question.

One mole of an ideal gas is compressed from 500 cm³ against a constant pressure of 1.2 × 10⁵ Pa. The work involved in the process is 36.0 J. Calculate the final volume.

Answer the following question.

Calculate the work done during the synthesis of NH₃ in which volume changes from 8.0 dm³ to 4.0 dm3 at a constant external pressure of 43 bar. In what direction the work-energy flows?

Answer the following in one or two sentences.

What are the units for rate constants for zero-order and second-order reactions if time is expressed in seconds and concentration of reactants in mol/L?

Answer the following in one or two sentences.

Write the relationships between rate constant and half-life of the first order and zeroth-order reactions.

Answer the following in one or two sentences.

How do the half-lives of the first order and zero-order reactions change with the initial concentration of reactants?

Answer the following in brief.

Obtain the relationship between the rate constant and half-life of a first-order reaction.

Answer the following in brief.

How will you represent the zeroth-order reaction graphically?

What are pseudo-first-order reactions?

Answer the following in brief.

Derive the integrated rate law for the first-order reaction.