The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?

• Halogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

• Carbon family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

Choose the incorrect statement about noble gas?

• Boiling point increases with increasing atomic mass

• Helium has least tendency to form compound

• Noble gases have some value of electron affinity

• Xenon has maximum number of compounds

Beryllium differs in properties from other elements of its own group but shows resemblance with aluminium because of

• relatively bigger ionic radius and high polarising power of Be

• relatively smaller ionic radius and high polarising power of Be

• relatively bigger ionic radius is the only reason behind this

• None of the above

234.

Which of the following pair of metals is purified by van- Arkel method?

• Zr and Ti

• Ag and Au

• Ni and Fe

• Ga and In

Which of the following is correctly arranged in order of increasing weight?

• 0.0105 equivalent of H₂CO₂ ·2H₂O < 0.625 g of Fe < 0.006 g atom of Ag <6.0 x 10²¹ atoms of Zn

• 0.625 g of Fe < 0.0105 equivalent of H₂C₂O₄ ·2H₂O < 6.0 x 10²¹ atoms of Zn < 0.006 g atom of Ag 

• 0.625 g of Fe < 6.0 x 10²¹ atoms of Zn < 0.006 g atom of Ag < 0.0105 equivalent of H₂C₂O₄ ·2H₂O

• 0.0105 equivalent of H₂C₂O₄. 2H2O < 0.006 g atom of Ag <6.0 x 10²¹ atoms of Zn < 0.625 g of Fe

A student made the following observations in the laboratory.

I. Clean copper metal did not react with 1 molar Pb(NO₃)₂ solution

II. Clean lead metal dissolved in a 1 molar AgNO₃ solution and crystals of Ag metal appeared

III. Clean silver metal did not react with 1 molar Cu(NO₃)₂ solution

The order of decrease in reducing character of three metals is

• Pb, Cu, Ag

• Pb, Ag, Cu

• Cu, Ag, Pb

• Cu, Pb, Ag

A number of elements available in earth's crust but most abundant elements are

• Al and Fe

• Al and Cu

• Fe and Cu

• Cu and Ag

The element which forms oxides in all oxidation states + 1 to + 5 is

• nitrogen

• phosphorus

• arsenic

• antimony

The correct order of decreasing first ionisation energy is

• C > B > Be > Li

• C > Be > B > Li

• B > C > Be > Li

• Be > Li > B > C

Consider the following reaction,

C₆H₅NO₂ $\stackrel{\mathrm{Sn} / \mathrm{HCl}}{\to }$ X $\stackrel{{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COCl}}{\to }$ Y + HCl

What is Y?

• Acetanilide

• Benzinilide

• Azobenzene

• Hydrazobenzene