Chemistry Past Questions And Answers
91
The leachate of a certain plant ash is used in local soap making because it contains
- A. sodium chloride and potassium hydroxide
- B. sodium hydroxide
- C. potassium hydroxide
- D. soluble carbonates and hydrogen carbonates
92
Electropositivity of elements across the periodic table normally
- A. remains constant down the group
- B. increases across the period
- C. decreases across the period
- D. decreases down the group
93
Alkanes are used mainly
- A. in the production of plastics
- B. as domestic and industrial fuels
- C. in the textile industry
- D. in the hydrogenation of oils
94
Chemicals that are produced in small quantities and with very high degree of purity are
- A. bulk chemicals
- B. fine chemicals
- C. heavy chemicals
- D. light chemicals
95
Which of the following physical properties decreases across the periodic table
- A) ionization potential
- B) electron affinity
- C) electronegativity
- D) atomic radius
96
A gas that is collected by upward delivery is likely to be
- A. heavier than air
- B. insoluble in water
- C. lighter than air
- D. soluble in water
97
The molecular shape and bond angle of water are respectively
- A) linear, 180°
- B) bent, 109.5°
- C) tetrahedral, 109.5°
- D) bent, 105°
98
Which of the following represents the type of bonding present in ammonium chloride molecule?
- A. Ionic only
- B. Covalent only
- C. Ionic and dative covalent
- D. Dative covalent only
99
Esterification of propane 1, 2, 3-triol and unsaturated higher carboxylic acids will produce
- A) fats
- B) soap
- C) alkanols
- D) methyl propanoate
100
The allotropy of carbon used in the decolourization of sugar is
- A. Graphite
- B. Soot
- C. Charcoal
- D. Lampblack