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

Explain, why are boiling points of carboxylic acids higher than corresponding alcohols

Write ‘four’ uses of hydrochloric acid.

What is the molecular formula of chromyl chloride?

(A) CrO₂Cl₂

(B) CrOCl₂

(C) CrCl₃

(D) Cr₂OCl₂

How is carbolic acid prepared from chlorobenzene?

What is the action of acidified potassium dichromate on - SO₂

Draw structure of dichromate ion

Classify the following ligands into monodentate and polydentate —

1. Ammonia
2. Carbon monoxide
3. Ethylene diamine
4. Ethylene diamine tetra acetate ion

Identify ‘A' and ‘B’ in the following reaction :

C₆H₅MgBr + C0₂ `(`> ‘A’   `(PCl_5)/()`> ‘B’

Write the structure and IUPAC names of all the metamers represented by formula C₄H₁₀

Write any ‘two’ uses of terylene.

Write the reactions involved in the preparation of  PVC

(b) Rate constant ‘k’ of a reaction varies with temperature ‘T’ according to the equation:

`logk=logA-E_a/2.303R(1/T)`

Where E_a is the activation energy. When a graph is plotted for `logk Vs. 1/T` a straight line with a slope of −4250 K is obtained. Calculate ‘E_a’ for the reaction.(R = 8.314 JK⁻¹ mol⁻¹)

Write cell reaction in lead storage battery during discharge.

Consider the reaction

`3I_((aq))^-) +S_2O_8^(2-)->I_(3(aq))^-) + 2S_2O_4^(2-)`

At particular time t, `(d[SO_4^(2-)])/dt=2.2xx10^(-2)"M/s"`

What are the values of the following at the same time?

a. `-(d[I^-])/dt`

b. `-(d[S_2O_8^(2-)])/dt`

c. `-(d[I_3^-])/dt`

300 M mol of perfect gas occupies 13 L at 320 K. Calculate the work done in joules when the gas expands-

(a) isothermally against a Constant external pressure of 0.20atm.

(b) isothermal and reversible process.

(c) into vaccum until the volume of gas is increased by 3L (R=8.314J mol^-1 K^-1)

Write the chemical reaction to prepare novolac polymer.

Explain the following term: Homopolymers

One mole of a gas expands by 3L against a constant pressure of 3 atmosphere. Calculate the work done in -

(a) L.atmosphere

(b) Joules

(c) Calories

Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :

(a) Hydrogen bonding

(b) Oxidation state

(c) Polyhalide ions

Write balanced chemical equations for action of potassium permanganate on: Hydrogen