HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

How much electricity in terms of Faraday is required to produce 40.0 g of Al from molten Al₂O₃?

(Given: Molar mass of Aluminium is 27 g mol⁻¹.)

What is the action of hydrochloric acid on the following?

\[\ce{NH3}\]

What is the action of hydrochloric acid on the following? 

\[\ce{Na2CO3}\]

Explain a graphical method to determine activation energy of a reaction.

Silver crystallises in FCC structure. If density of silver is 10.51 gcm^-3, calculate the volume of unit cell. [Atomic mass of slive (Ag) = 108 gm^-1]

The vapour pressure of pure benzene is 640mm og Hg. 2.175×10^-3kg of non-vloatile solute is added to 39 gram of benzene the vapour pressure of solution is 600mm of HG. Calculate molar mass of solute.

[C = 12, H = 1]

What are Ellingham's diagrams? Write 2 features of it.

What are neutral oxides?

Explain the nature of zinc oxide with the help of the reactions.

Absolute entropies of solids, liquids and gases can be determined by

• Measuring heat capacity of substance at various temperatures
• Subtracting standard entropy of reactants from products
• Measuring vibrational motion of molecules
• Using formula ΔS° = S_T° - S_O°

The determination of molar mass from elevation in boiling point is called as

• cryoscopy
• colorimetry
• ebullioscopy
• spectroscopy

 How is propene converted into 1- bromopropane and 2 - bromopropane?

The preparation of alkyl fluoride from alkyl chloride, in presence of metallic fluorides is known as ______________.

Colligative property depends only on ........................ in a solution.

Draw neat and labelled diagram of dry cell.

Determine whether the reactions with the following ΔH and ΔS values are spontaneous or non-spontaneous. State whether the reactions are exothermic or endothermic.

(a) ΔH = -110kJ, ΔS = + 40JK^-1 at 400 K

(b) ΔH = + 40kJ, ΔS = -120JK^-1 at 250K

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with `t_(1/2)` = 3 hours. What fraction of the sample of sucrose remains after 8 hours?

Niobium crystallises as body centred cube (BCC) and has density of 8.55 Kg / dm^-3 . Calculate the attomic radius of niobium.

(Given : Atomic mass of niobium = 93).

What is the geometry of chromate ion?

1. Tetrahedral                    
2. Octahedral
3. Trigonal planer              
4. Linear

Identify the strongest acid amongst the followings:

1. Chloroacetic acid          
2. Acetic acid
3. Trichloroacetic acid
4. Dichloroaceticacid