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

Why is molality of a solution independent of temperature?

Define “zero order reaction”.

In a first order reaction x → y, 40% of the given sample of compound remains unreacted in 45 minutes. Calculate rate constant of the reaction.

A → B is a first order reaction with rate 6.6 × 10^-5m-s^-1. When [A] is 0.6m, rate constant of the reaction is

• 1.1 × 10^-5s^-1
• 1.1 × 10^-4s^-1
• 9 × 10^-5s^-1
• 9 × 10^-4s^-1

How are ketones classified?

What is calcination?

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?

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

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.