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

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+?

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))`

The boiling point of water at high altitude is low. because________________ .

(a) the temperature is low.                                         

(b) the atmospheric pressure is low.

(c) the temperature is high.

(d) the atmospheric pressure is high

Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -
(a) Magnetic property                                        
(b) Oxidation state
(c) Hydrides

Describe triclinic crystal lattice with the help of a diagram.

Write any four applications of electrochemical series

Write chemical formulae of the following ores :

(a) Calamine 

(b) Haematite                     

(c) Magnetite

(d) Corundum

What is the action of hot/concentrated nitric acid on - Arsenic   

How much electricity in terms of Faraday is required to produce 20 g of Ca from molten CaCl₂?

(Given: Molar mass of Calcium is 40 g mol⁻¹.)

Fe₂O₃ is reduced to spongy iron near the top of blast furance by

(A) H₂

(B) CaO

(C) SiO₂

(D) CO

Mention names and formulae of two ores of alumunium.

ln which pair highest oxidation states of transition metals are found:

Calculate magnetic moment of  `Fe_((aq))^(2+) ion (Z=26).`

Why does p-nitrochlorobenzene undergo displacement reactions readily with attack of nucleophilic HO^{Θ ion}?

Why +2 oxidation state of manganese is more stable?