43
As the difference in electronegativity between bonded atoms increases, polarity of the bond?
- A. decreases
- B. increases
- C. remains unchanged
- D. reduces to zero
44
Two atoms represented as U and U are?
- A. isomers
- B. allotropes
- C. isotopes
- D. anomers
45
An element, E, has the electronic configuration 1s22s22p63s2p3. The reaction of E with a halogen X can give?
- A. EX3 and EX5
- B. EX3 only
- C. EX5 only
- D. EX2 and EX3
46
For iodine crystals to sublime on heating, the molecules must acquire energy that is?
- A. less than the forces odf attraction in the solid
- B. equal to the forces of attraction in th solid
- C. necessary to melt the solid
- D. greater than the forces of attraction in both the solid and the liquid phases
47
How many moles of oxygen molecules would be produced from the decomposition of 2.50 moles of potassium trioxochlorate (V)?
- A. 2.50
- B. 3.50
- C. 3.75
- D. 7.50
48
A balanced chemical equation obeys the law of?
- A. conservation of mass
- B. difinite proportions
- C. multiple proportions
- D. conservation of energy
49
Which of the following substances is a mixture?
- A. Sulphur powder
- B. Bronze
- C. Distilled water
- D. Ethanol