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

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

How is nitric acid prepared by Ostwald’s process?

Construct a labelled diagram for the following cell:

`Zn|Zn^(2+)(1M)||H^+(1M)|H_(2(g,1atm))|Pt`

Write the names and chemical formulae of any ‘two’ minerals of aluminium.

Arrange the following oxyacids of chlorine – HClO, HClO₂, HClO₃, and HClO₄ with respect to Increasing order of thermal stability.

Effective atomic number rule is used to find _______.
(A) geometry of complex
(B) stability of complex
(C) number of isomers of complex
(D) number of possible ligands around metal ion in complex

Which one of the following ions is coloured?

Explain basic nature of amines.