The metal which deposits copper from copper sulphate solution is

• gold

• iron

• platinum

• mercury

On Pauling scale, the electronegativity of an element is measured by using

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = 0.208 \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} + {\mathrm{\chi }}_{\mathrm{B}} = 0.208 \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = 0.208 {∆}^2$

There is a general understanding of ionic radius based on the nuclear charges and the number of electrons surrounding the nucleus which generally works very well. Which one of the following represents the correct decreasing order ofionic radius for C^4-, N^3-, O^2- and F^-?

• C^4- > N^3- > O^2- > F^- 

• F^-> O^2- > N^3- > C^4-

• O^2- > N^3- > C^4- > F^-

• F^- > N^3- > C^4- > O^2-

What is the name of the element with atomic number 105?

• Dubnium

• Holmium

• Kurchatovium

• Nobelium

175.

The ions N^3-, O^2-, F^-, Na⁺, Mg²⁺ are isoelectronic. Their ionic radii show

• an increase from N^3- to F^- and then decrease from N⁺ to Mg²⁺

• a decrease from N^3- to F^- and then increase from Na⁺ to Mg²⁺

• a significant increase from N^3- to Mg²⁺

• a significant decrease from N^3- to Mg²⁺

Which of the following pairs of ions cannot be separated by H₂S in dilute HCl?

• Bi³⁺, Sn⁴⁺

• Al³⁺, Hg²⁺

• Cu²⁺, Zn²⁺

• Ni²⁺, Cu²⁺

The radius of H-atom in its ground state is 0.58Å .The radius of, ₃Li²⁺ ithe similar state is

• 0.1777 Å

• 0.706 Å

• 1.06 Å

• 0.058 Å

The correct order of ionization energies is

• Cu > Ag > Au

• Cu > Au > Ag

• Au > Cu > Ag

• Ag > Au > Cu

The set representing the correct order of ionic radius is

• Li⁺ > Be²⁺ > Na⁺ > Mg²⁺

• Na⁺ > Li⁺ > Mg²⁺ > Be²⁺

• Li⁺ > Na⁺ > Mg²⁺ > Be²⁺

• Mg²⁺ > Be²⁺ > Li⁺ > Na⁺

Which of the following has highest electron affinity?

• N

• O

• F

• Cl