An example of an acidic oxide is
NO
CO
SO2
CuO
Correct answer is C
No explanation has been provided for this answer.
The metal whose ore can be concentrated by passing it through a magnetic separator is
Zn
Sn
Cu
Ca
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements is correct about the periodic table?
Elements in the same group have the same number of electron shells
The non-metallic properties of the elements tend to decrease across each period
Elements in the same period have the same number of valence electrons
The valence electrons of the elements increase progressively across the period
Correct answer is D
No explanation has been provided for this answer.
Which of the following is not an alkali?
Ca(OH)2
NH3
NaOH
Al(OH)3
Correct answer is D
Al(OH)3 is not generally an alkali but is amphoteric; acting as a base and an acid when the need arises.
Alkanols have the general molecular formula
CnH2n-2
CnH2n+1CHO
CnH2n-2OH
CnH2n+1OH
Correct answer is D
No explanation has been provided for this answer.