The ionization energy is affected by the following factors except
- A. distance of the outermost electron(s) from the nucleus
- B. size of the positive nuclear charge
- C. ability to attract shared electron(s)
- D. screening effect of the inner electron(s)
The oxidation number of X in \(XO_{4}^{3-}\) is
- A. +1
- B. +3
- C. +4
- D. +5
Which of the following substances does not have van der Waals’ forces?
- A. Copper
- B. Graphite
- C. Neon
- D. Iodine crystals
Which of the following metals has the strongest metallic bond?
- A. \(_{13}Al\)
- B. \(_{19}K\)
- C. \(_{12}Mg\)
- D. \(_{11}Na\)
Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?
- A. Na, Al, P, Cl
- B. Cl, P, Al, Na
- C. Na, P, Cl, Al
- D. Al, Na, P, Cl
The oxidation number of nitrogen in \(Pb(NO_{3})_{2}\) is
- A. +2
- B. +3
- C. +4
- D. +5
The reason for the decrease in the atomic size of elements across a period is that
- A. nuclear charge increases while the outermost electrons are drawn closer to the nucleus
- B. nuclear charge decreases while the outermost electrons are drawn closer to the nucleus
- C. valence electrons increase across the period while the valence shell remains constant
- D. nuclear charge decreases while the distance of the valence shell from the nucleus is increasing
The property of elements which increases down a group of the periodic table is
- A. electronegativity
- B. electron affinity
- C. ionic radius
- D. ionization energy
Atomic orbital is
- A. the circular path through which electrons revolve round the nucleus
- B. a region around the nucleus where electrons are most likely to be found
- C. the path around the nucleus through which electrons move
- D. the path around the nucleus through which protons move
The mass of one mole of \((NH_{4})_{2}CO_{3}\) is [O=16.0, N=14.0, C=12.0, H=1.0]
- A. 66.0g
- B. 76.0g
- C. 80.0g
- D. 96.0g
The purity of a solid sample can best be determined by its
- A. boiling point
- B. melting point
- C. conductivity
- D. solubility
The seperation of Nitrogen from oxygen using fractional distillation of air is possible because
- A. nitrogen is less dense than oxygen
- B. oxygen is more reactive than nitrogen
- C. of the difference in their boiling points
- D. they belong to the same period
The species with no electron in the 3d-orbital is
- A. \(Zn^{2+}\)
- B. \(Sc^{3+}\)
- C. Cu
- D. \(Mn\)
Pauli exclusion principle is related to
- A. quantity of electrons in the valence shell
- B. filling the orbitals with lower energy first
- C. the filling of degenerated orbitals
- D. quantum numbers of electrons
The following glasswares are used to measure the volume of liquids EXCEPT
- A. graduated beaker
- B. pipette
- C. test tube
- D. burette
Which of the following species determines the chemical properties of an atom?
- A. Electron
- B. Neutron
- C. Nucleus
- D. Proton