43
The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is
- A. 6.9
- B. 7.1
- C. 6.2
- D. 6.8
44
Which of the following questions is correct about the periodic table?
- A. The non-metallic properties of the elements tend to decrease across each period
- B. The valence electrons of the elements increase progressively across the period
- C. Elements in the same group have the same numbeer of electron shells
- D. Elements in the same period have the number of valence electrons
45
From the diagram above, an ideal can be represented by
- A. M
- B. N
- C. K
- D. L
46
Which of the following properties is NOT peculiar to matter?
- A. kinetic energy of particles increase from solid to gas
- B. Random motion of particles increases from liquid to gas
- C. Orderliness of particles increases from gas to liquid
- D. Random motion of particles increases from gas to solid
47
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na = 23, O = 16, H = 1]
- A. 0.40 mol dm-3
- B. 0.50 mol dm-3
- C. 0.05 mol dm-3
- D. 0.30 mol dm-3