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

Answer the following

How nanotechnology plays an important role in water purification techniques?

Which flower is an example of self-cleaning?

Explain, why [Co(NH₃)₆]³⁺ ion is low spin? Calculate number of unpaired electrons and write the geometry of [Co(NH₃)₆]³⁺.

Answer the following with respect to [CoF₆]^3– ion

1. Type of hybridization
2. Number of unpaired electrons
3. Geometry of complex ion
4. Magnetic property

Freezing point depression constant of a solvent is _______.

What is a cryoscopic constant?

Write the effect of dissolution of a nonvolatile solute on the freezing point of solvent.

Calculate total moles after dissociation in 0.1 M KCl solution and 0.05 M aluminium sulphate solution. Hence, decide which of the two solutions will have higher freezing point depression.

Explain with vapour pressure-temperature curves that the freezing point of a solvent is lowered by dissolving a nonvolatile solute into it. Give reason for such lowering of freezing of solvent.

If ‘IP’ is the ionic product and ‘K_sp’ is the solubility product, precipitation of the compound will occur under the condition when:

Write the solubility product of sparingly soluble salt Bi₂S₃.

Write the relationship between molar solubility (S) and solubility product (K_sp) for CaF₂.

The solubility product of BaCl₂ is 4.0 × 10^-8. What will be its molar solubility in mol dm^-3?

Define molar solubility. Write it’s unit.

Write solubility product of following sparingly soluble salt.

BaSO₄

Write solubility product of following sparingly soluble salt.

CaF₂

The solubility of AgBr in water is 1.20 × 10^–5 mol dm^–3. Calculate the solubility product of AgBr.

If ‘S’ is solubility in mol dm^–3 and Ksp is the solubility product, then write the relation between them for CaF₂ and BaSO₄. Calculate the concentration of H₃O⁺ ion in soft drink whose pH is 3.5.

Define Solubility product.

Correct order of acid strength for

1. acetic acid
2. fluoroacetic acid
3. 4-Nitrobenzoic acid 
4. 4-Methyl benzoic acid is ______.