43
NH4– is formed from NH3 and H– by
- A. covalent bonding
- B. dative bonding
- C. hydrogen bonding
- D. ionic bonding
44
The relative atomic mass of chlorine is not a whole number because
- A. it is the weighted average mass of all its various isotopes
- B. it is the average mass of all the isotopes of the element
- C. the element has strong oxidizing ability
- D. the atom contains a higher number of neutrons than protons
45
An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?
- A. 1718W
- B. 1817W
- C. 3517W
- D. 3518W
46
Which of the following transition metals is not attracted to external magnetic field?
- A. Cu
- B. Fe
- C. Ti
- D. Zn
47
The electron configuration of \(_{26}Fe^{3+}\) is?
- A. [Ar]4s23d6
- B. [AR]4s23d3
- C. [AR]4s13d4
- D. [AR]4s03d5
48
Which of the following processes is used in food preservation in an industry?
- A. Carbon dating
- B. Ieeadiation of gamma rays
- C. Nuclear fission
- D. Nuclear fusion
49
Which of the following arrangements is in decreasing order of atomic radius?
- A. Li>Be>C>
- B. Li>B>Be>C
- C. Li>Be>B>C
- D. C>B>Be>Li
50
The two elements 11X and 19Y are in the same group because they have the same
- A. valence electrons
- B. ionization energy
- C. number of shell
- D. atomic size
51
Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a
- A. strongly electronegative atom
- B. non-polar species
- C. diatomic element
- D. complex ion
52
The crystal layers in graphite are held together by
- A. covalent bond
- B. electrostatic forces
- C. ionic bond
- D. van der Waal's forces
53