Which of the following statements about rare gases are correct?
Their outermost shells are fully filled
They are generally unreactive
Their outermost shells are partially filled
They have lone pair of
Correct answer is A
No explanation has been provided for this answer.
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 → \(Na^+ + e^-\)
One advantage of cross breeding is that the
Offspring resemble the recessive parent
Yield of the offspring may not be comparable to those of the parents
Offspring performs better than the average of the parents
Offspring cannot survive adverse environmental conditions
Correct answer is C
No explanation has been provided for this answer.
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.