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

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Ridhima wants to detect the structure of the surface of materials. Name the technique she has to use.

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What do you mean by sol and gel?

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Describe the sol-gel method of preparation for nanoparticles.

The pair [Co(NH₃)₅(SO₄)]Br and [Co(NH₃)₅Br]SO₄ exhibits ____________ isomerism

Write the type of isomerism exhibited by [Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅ONO]²⁺ pair of complex ion.

Define the term Co-ordination isomer.

Define the term Hydrated isomers.

Draw structure of cis isomer of [Co(NH₃)₄Cl₂]⁺

Draw the geometrical isomers of the following complexes [Pt(NH₃)(H₂O)Cl₂].

Draw optical isomers of [Co(en)₃]³⁺.

Explain reactions of haloarenes with sodium metal.

Calculate the packing efficiency for bcc lattice.

In case of hcp structure, how are spheres in first, second and third layers arranged?

A substance crystallizes in fcc structure. The unit cell edge length is 367.8 pm. Calculate the molar mass of the substance if its density is 21.5 g/cm³.

The following solution/solvent has maximum vapour pressure _______.

According to Raoult’s law, relative lowering of vapour pressure of solution containing dissolved nonvolatile solute _______.

Write the expression for relative lowering of vapour pressure.

The vapour pressure of a pure liquid is 0.043 bar at a certain temperature. When a nonvolatile solute is dissolved into it, the vapour pressure of the solution is found to be 0.041 bar. What is the relative lowering of vapour pressure?

For a very dilute solution, the osmotic pressure is given by π = n₂RT/V where V is the volume in L containing n₂ moles of nonvolatile solute. Establish the equation for molar mass of solute.

Give two points to explain why vapour pressure of solvent is lowered by dissolving nonvolatile solute into it.