HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

In the extraction of Al, impure Al₂O₃ is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

Define the following term: Primitive unit cells

How will you distinguish between the following pair of terms?

Crystal lattice and unit cell

Define the following terms : Molarity

Account for the following:

Zn is not considered as a transition element.

Draw the structure of aspirin.

Show how the following compound can be converted to benzoic acid.

Phenylethene (Styrene)

An antifriction alloy made up of antimony with tin and copper, which is extensively used in machine bearings is called _______.

(A) Duralumin

(B) Babbitt metal

(C) Spiegeleisen

(D) Amalgam

Fe2+ ions react with nitric oxide formed from reduction of nitrate and yields a brown  coloured complex _____________.

On passing 1.5 F charge, the number of moles of aluminium deposited at cathode are _______ [Molar mass of Al = 27 gram mol^–1]

(A) 1.0

(B) 13.5

(C) 0.50

(D) 0.75

Write any two uses of H₂SO₄

Define Leaching.

`CH_3-CH_2-Br"Alcoholic KOH"/""> B " HBR"/"">C"Na/Eather"/"">D`, the Compound D is

(A) ethane

(B) propane

(C) n-butane

(D) n-pentane

Write the factors which are related to the colour of transition metal ions.

Define racemic mixture.

What is ‘effective atomic number’ (EAN)?

Calculate the effective atomic number of the central metal atom in the following  compounds:

K₄Fe(CN)₆  Fe(Z=26)

Write a note on ‘aldol condensation’.

Write a note on ‘aldol condensation’.

An ionic crystal lattice has limiting value of radius ratio as 0.414 to 0.732; the co-ordination number of its cation is _______.

(A) 6

(B) 4

(C) 3

(D) 12