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

What happens when dilute sulphuric acid is treated with Fe

What happens when dilute sulphuric acid is treated with CaF₂

Calculate the standard enthalpy of the reaction, 2C(graphite) + 3H_2(g) → C₂H_6(g), ΔH° = ?

From the following ΔH° values

a) `C_2H_6(g) + 7/2 O_2(g) -> 2CO_2(g) + 3H_2 O(l)`.  ΔH° = -1560kJ

b) `H_2(g) + 1/2 O_2 (g) -> H_2O(l)`  ΔH° = -285.8kJ

c) C(graphite) + O₂(g) -> CO₂(g). ΔH° = -393.5kJ

Write reactions involved in preparation of potassium dichromate from chrome iron ore

Calculate ∆H° for the following reaction:

2H₃BO_3(aq) → B2O_3(s) + 3H₂O_(l)

a) H₃BO_3(aq) → HBO_2(aq) + H₂O_(l) , ∆`H_1^@` = − 0.02 kJ

b) H₂B₄O_7(s) → 2B₂O_3(s) + H₂O_(l) , ∆`H_2^@` = 17.3 kJ

c)H₂B₄O_7(s) + H₂O_(l) → 4HBO_2(aq), ∆`H_3^@` = − 11.58 kJ

What are Frenkel defect

Write electrode reaction and net cell reaction for fuel cell. Calculate e.m.f. of the following cell at 25 °C.

Standard reduction potential (SRP) of Zn and Cu are − 0.76 V and 0.334 V respectively

Write electronic configuration and two uses of neon. (Z = 10)

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

What is the action of concentrated sulphuric acid on copper

What is the action of concentrated sulphuric acid on potassium chlorate?

Write the electronic configuration of the following element:

Krypton (Z = 36)

In the hydrogen-oxygen fuel cell, the carbon rods are immersed in the hot aqueous solution of __

(a) KCl

(b) KOH

(c) H₂SO₄

(d) NH₄Cl

Which of the following 0.1 M aqueous solutions will exert the highest osmotic pressure?

Derive the relation between the elevation of boiling point and molar mass of solute.

Define Semipermeable membrane

Explain the geometry of `[Co(NH_3)_6]^(3+)` on the basis of hybridisation. (Z of Co = 27)

Write chemical reactions for different steps in the manufacture of sulphuric acid by lead chamber process. Draw the structure of phosphorous pentachloride

Calculate the work done in the following reaction at 50°C. State whether work is done on the system or by the system.
`"SO"_2("g") + 1/2"O"_(2("g")) rightarrow "SO"_(3("g"))`

Define the following term:
isotonic solution