Chemistry Multiple Choice Questions

Chemistry

• The elements Fe, Mn, Ni, Cr, Cd are mentioned.

Gas 'X'

• Passing gas 'X' through Nessler's reagent produces a brown precipitate.

Salts

• White-colored salts are mentioned, with a total of 5.
• Examples of white-colored salts include:
  • Ammonium sulphide
  • Ammonium arsenomolybdate
  • Lead sulphate

Molecular Symmetry

• Molecules with different symmetry about the molecular axis are mentioned.

Compounds

• The compound that is white in color is Lead sulphate.

Hydrogen Bonding

• Intra-molecular hydrogen bonding occurs in the compound o-Hydroxybenzoic acid.

Ionic Character

• The compounds CoCl2, KCl, BaCl2, and AgCl are compared for their ionic character.
• AgCl is the least ionic of these compounds.

Polar Molecules

• The molecules CCl4, CO2, CH2=CH2, and CHCl3 are compared for their polarity.
• CHCl3 is a polar molecule.

Noble Gases

• Noble gases are monoatomic gases held together by strong dispersion forces.
• Due to these forces, they are liquefied at very low temperatures and have high boiling points.

Molecular Shapes

• The molecule BrF5 has a square pyramidal shape.
• The molecule/ion PCl5 has a trigonal bipyramidal shape.
• Aluminium chloride in acidified aqueous solution forms an ion with an octahedral geometry.
• The molecule/ion [Ni(CN)4]2- has a square planar shape.

Molecular Orbitals

• The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals have the same symmetry about the molecular axis.