41. What is the relative molecular mass of a compound which has empirical formula \(CH_{2}O\)? [C= 12, H= 1, O= 16]
- A. 42
- B. 45
- C. 126
- D. 180
42. Atoms are electrically neutral because they
- A. do not conduct electricity
- B. contain equal number of protons and electrons
- C. are composed of neutrons and electrons
- D. cannot be attracted by electromagnetic field.
43. Common Salt (NaCl) is used to preserve foods. Which of the following properties can be used to determine its purity before use?
- A. Solubility in water
- B. Melting point
- C. Relative density
- D. Crystalline nature
44. Which of the following electron configurations represents the transition element Chromium \(_{24}Cr\)?
- A. \(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\)
- B. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\)
- C. \(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\)
- D. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
45. The atomic number of an isotope of hydrogen is equal to its mass number because it
- A. has a totally filled valence shell
- B. has a high charge to mass ratio
- C. does not contain neutrons
- D. exhibits isotopy
46.
The atomic number of an isotope of hydrogen is equal to its mass number because it
- A. has a totally filled valence shell
- B. has a high charge to mass ratio
- C. does not contain neutrons
- D. exhibits isotopy
47. The bonding pair of electrons in a Hydrogen Chloride molecule is pulled towards the chlorine atom because
- A. chlorine has a larger atomic size
- B. chlorine has a larger atomic mass
- C. chlorine is more electronegative
- D. there is no bonding orbitals within the hydrogen atom
48. The solubility of CO2 in water can be accounted for by
- A. Van der Waal’s forces
- B. Ionic attraction
- C. dipole attraction
- D. covalent bonding
49. Which of the following properties would not influence electrovalent bond formation?
- A. Electronegativity
- B. Electron Affinity
- C. Ionization potential
- D. Catalytic ability
50. Particles in a solid exibit
- A. vibrational motion
- B. vibrational and translational motion
- C. vibrational and random motion
- D. random and translational motion
