What are the differences between minerals and ores?

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.

Give the uses of helium.

What are actinides? Give three examples.

[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?

Distinguish tetrahedral and octahedral voids.

Explain the rate determining step with an example.

Discuss the Lowry – Bronsted concept of acids and bases.

Calculate the concentration of OH^- in a fruit juice which contains \(2\times10^{-3}\) M, H₃O⁺ ion. Identify the nature of the solution.

Why is anode in galvanic cell considered to be negative and cathode positive electrode?

The resistance of a conductivity cell is measured as 190 Ω using 0.1M KCl solution (specific conductance of 0.1M KCl is 1.3 Sm^-1). When the same cell is filled with 0.003 M sodium chloride solution, the measured resistance is 6.3KΩ. Both these measurements are made at a particular temperature. Calculate the specific and molar conductance of NaCl solution.

Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂?

Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI.

Identify X and Y.
\({ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MgBr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y\)

Give the characteristics of image formed by a plane mirror.

There are two isomers with the formula  CH₃NO₂. How will you distinguish between them?

Give any three difference between DNA and RNA.

How do antiseptics differ from disinfectants?