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

Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :

`Ag^+(aq)+e^(-)rarrAg(s)" ""      ""       "E^@=+0.80V`

`H^+(aq)+e^(-)rarr1/2H_2(g)" "" "" " E^@=0.00V`

On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ?

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).

(Given : Molar mass of benzoic acid = 122 g mol⁻¹, K_f for benzene = 4.9 K kg mol⁻¹)

An element with molar mass 27 g mol⁻¹ forms a cubic unit cell with edge length 4.05 ✕ 10⁻⁸ cm. If its density is 2.7 g cm⁻³, what is the nature of the cubic unit cell?

Calculate Δ_rG^° for the reaction 

Mg (s) + Cu²⁺ (aq) → Mg²⁺ (aq) + Cu (s)

Given : E^°_cell = + 2.71 V, 1 F = 96500 C mol^–1

Describe the following:

Cannizzaro reaction

Write any ‘two’ advantages of calomel electrode. 

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

The secondary structure of protein is determined by _______.

(A) co-ordinate bond

(B) ionic bond

(C) hydrogen bond

(D) covalent bond

Write names and chemical formulae of monomers used in preparing Buna-N.

Explain optical activity of lactic acid

Explain with reason sign conventions of ΔS in the following reaction

N_2(g) + 3H_2(g) → 2NH_3(g)

Explain with reason sign conventions of ΔS in the following reaction

CO_2(g) → CO_2(g)

Potential of saturated calomel electrode is-

A face centred cube (FCC) consists of how many atoms? Explain

What happens when thin copper leaves are thrown in jar containing chlorine?

Write the formulae of the raw materials used for preparation of Buna-S

Write four postulates of Werner's theory.

How are the following conversions carried out?

2-methylbutan-1-ol into 2 -methylbutanoic acid.

What is the action of chlorine (Cl) on the following:

Cold and dilute caustic soda

What is the action of chlorine (Cl) on the following:

Hot and concentrated caustic soda