When sodium atom form the ion Na+,
it gains one proton
it achieves a noble gas configuration
its atomic number increases
it gains one electron
Correct answer is B
When the sodium atom forms an ion, Na+ it loses one electron, i.e. it achieves a noble gas electronic configuration. It will lose one of its 11 electrons to have 10 electrons like neon.
\(Na - e^- → Na^+\)
Na → \(Na^+ + e^-\)
Which of the following equations represents a substitution reaction?
C 2H10(g) + CI 2(g) → C4H9 CI(g) + HCI(g)
C 2H4(g) + HCI (g) → C 2H5 CI(l)
C2H2(g) + 2H 2(g) → C 2H6(g)
C 3H4(g) + 402(g) → 3CO2(g) + 2H 2O(g)
Correct answer is A
No explanation has been provided for this answer.
The ammonium compound used in the manufacture of dry cells is
NH4NO3
(NH4)SO4
NHCI4
(NH4)2CO3
Correct answer is C
No explanation has been provided for this answer.
Which of the following substance is an ore of iron?
Bauxite
Cassiterite
Haematite
Steel
Correct answer is C
No explanation has been provided for this answer.
Waste plastics accumulate in the soil and pollute the environment because plastic materials are
insoluble in water
non -biodegradable
easily affected by heat
inflammab,le
Correct answer is B
No explanation has been provided for this answer.