HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

Write the hybridization and shape of the following complexe : [Ni(CN)₄]^2–

^{(Atomic number : Co = 27, Ni = 28)}

Calculate the freezing point of the solution when 31 g of ethylene glycol (C₂H₆O₂) is dissolved in 500 g of water.

(K_f for water = 1.86 K kg mol^–1)

Draw the structure of: Pyrophosphoric acid

Write the electronic configuration of the following elements:

Sulphur (Z = 16)

When primary amine reacts with CHCl3 in alcoholic KOH, the product is _______.

(A) aldehyde

(B) alcohol

(C) cyanide

(D) an isocyanide

The unit of rate constant for zero order reaction is _______.

(A) t^–1

(B) mol dm^–3 t^–1

(C) mol^–1 dm³ t^–1

(D) mol^–2 dm⁶ t^–1

Define enzymes.

Which among the following reactions is an example of a zero order reaction?

a) `H_(2(g)) + I_(2(g)) -> 2HI_(g)`

b) `2H_2O_(2(l)) -> 2H_2O_(l) + O_(2(g))`

c) `C_12H_22O_(11(aq)) + H_2O_(l) -> C_6H_12O_(6(aq)) + C_6H_12O_(6(aq))`

d) `2NH_(3g)`   `N(2g) + 3H_(2(g))`

Define Freezing point.

3.795 g of sulphur is dissolved in 100g of CS₂. This solution boils at 319.81 K. What is the molecular formula of sulphur in solution? The boiling point of CS₂ is 319.45 K. (Given that K_b for CS₂ = 2.42 K kg mol^-1 and atomic mass of S = 32)

What is the action of following reagents on glucose?

bromine water

What is the action of following reagents on glucose?

dilute HNO₃

What is the action of following reagents on glucose?

hydroxyl amine

What is the action of Benzene Sulphonyl Chloride on primary, secondary and tertiary
amines?

Draw the structure of H₄P₂O₆ hypophosphoric acid

Stachyose is an example of _______.

(A) monosaccharides

(B) disaccharides

(C) trisaccharides

(D) tetrasaccharides

Draw a neat, labelled energy profile diagram for SN¹ reaction mechanism.

What is the action of nitrous acid on secondary nitroalkane?

What is the action of nitrous acid on tertiary nitroalkane

Write 'two' uses of phenol.