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

The hybridisation of phosphorus in phosphorus pentachloride is _______.

(A) dsp³

(B) sp³ d

(C) d² sp³

(D) sp³ d²

The rate constant for a first order reaction is 100 s^–1. The time required for completion of 50% of reaction is _______.

(A) 0.0693 milliseconds

(B) 0.693 milliseconds

(C) 6.93 milliseconds

(D) 69.3 milliseconds

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

Write chemical formula of the following oxoacids of chlorine:

a. Hypochlorous acid

b. Chlorous acid

c. Chloric acid

d. Perchloric acid

What is the action of nitrous acid on primary nitroalkane?

Write the reactions involved in the preparation of Teflon.

The atomicity of sulphur in orthorhombic sulphur is______________ .

(a) 8                                

(b) 6                                 

(c)  4                                

(d)  2

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.

Define Cryoscopic constant.

Draw the structure of: Orthophosphoric acid 

Describe laboratory method for preparation of glucose.

For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

 A first order reaction takes 40 minutes for 30% decomposition. Calculate t_1/2 for this reaction. (Given log 1.428 = 0.1548)

In body centred cubic structure the space occupied is about

(A) 68%                                                     (B) 53%

(C) 38%                                                     (D) 32%

Which of the following solutions shows maximum depression in freezing point?

(A) 0.5 M Li₂SQ₄

(B) 1 M NaCl

(C) 0.5 M A1₂(SO₄)₃

(D) 0.5 MBaC1₂

Draw structure and write geometry of PCl₃ and PCl_5.

Prove that ΔH=ΔU+ΔnRT. what is the condition under which ΔU=ΔH?

Prove that ΔH=ΔU+ΔnRT. what is the condition under which ΔU=ΔH?

How is 4-methylpent-3-en-2-one obtained from propan-2-one?