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

Amongst the following identify the criterion for a process to be at equilibrium -

1. ΔG < 0
2. ΔG > 0
3. ΔS_total=0
4. ΔS < 0

The equilibrium constant Kp for the reaction,

H_2(g) + I_2(g) → 2HI_(g) is 130 at 510 K. Calculate ΔG^o for the following reaction at the same temperature: 2HI_(g) → H_2(g) + I_2(g) [Given: R = 8.314 J K^-1 mol^-1 ]

Derive the relation between `DeltaG^@`and equilibrium constant (K) for the reaction -

aA_bB ⇌ cC+dD.​

Write chemical reactions involved in Van Arkel method for refining Titanium

Explain the relationship between Gibb's standard energy change of the reaction and equilibrium constant.

The following electronic configuration of elements shows highest oxidation state

Name the radioactive element in lanthanoids.

Give the electronic configuration of europium (Z = 63).

Explain the trend in an Oxidation state of 3d elements.

Give the properties of Lanthanoids.

Give the electronic configuration of gadolinium (Z = 64).

Write expected and observed electron configurations of ₅₈Ce.

Eu (Z = 63) and Yb (Z = 70) show + 2 oxidation state. Explain.

What are the physical properties of lanthanoids?

Write two uses of lanthanoids.

Define actinoid contraction.

State Third law of thermodynamics. Give ‘two’ uses.

No machine has an efficiency unity', is stated in-

(a) first law of thermodynamics

(b) second law of thermodynamics

(c) third law of thermodynamics

(d) Hess' law of constant heat summation

Give two uses of the Third law of thermodynamics.

Write two applications of lanthanoids.