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

Explain calcination with reactions.

Which of the following vitamins is water soluble?

1. A
2. D
3. E
4. B

Write the structures and IUPAC names of the :Adipic acid compound

Write the structures and IUPAC names of the α - methyl butyraldehyde.

Define lanthanoid contraction.

0.1 mole of Buckminster fullerene contains how many kg of carbon? [Atomic mass of carbon = 12]

Define Hydrometallurgy?

What is the position of iron (Z = 26) in periodic table?

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?

(a) Polling                      

(b) Pyrometallurgy

(c) Hydrometallurgy

(d) Calcination

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

Vitamin ‘C’ belongs to the class of—

(a) Vitamins of aliphatic series

(b) Vitamins of aromatic series

(c) Vitamins of alicyclic series

(d) Vitamins of heterocyclic series

Which among the following molecular formulae represents urotropine?

(a) C₆H₁₂N₄

(b) C₆H₂₄H₄                    

(c) C₆H₁₂N₄O₂

(d) C₆H₂4N₄O₂

What are chemical twins? Write ‘two’ examples.

What is the covalency of nitrogen in N₂O₅?

A reaction is second order in A and first order in B.

(i) Write the differential rate equation.

(ii) How is the rate affected on increasing the concentration of A three times?

(iii) How is the rate affected when the concentrations of both A and B are doubled?

Distinguish between crystalline solid and amorphous solid.

What is pseudo first order reaction? Give one· example of it.

which of the following carbocations is least stable?

(A) 

(B)

(C)

(D)

Compound having general formula is called

(A) diester

(B) acid anhydride

(C) hemiacetal

(D) acetal