Which of the following ions is a pollutant in drinking water even in trace amounts?
Ca2+
Hg2+
Mg2+
Fe2+
Correct answer is B
No explanation has been provided for this answer.
nitrogen
neon
argon
oxygen
Correct answer is D
Alkaline pyrogallol absorbs 92
Which of the following is arranged in order of increasing electronegativity?
Chlorine, aluminium, magnesium, phosphorus, sodium
sodium, magnesium, aluminium, phosphorus, chlorine
Chlorine, phosphorus, phosphorous, aluminium, magnesium, sodium
Sodium, chlorine, phosphorus, magnesium, aluminium
Correct answer is B
No explanation has been provided for this answer.
Which of the following represents the type of bonding present in ammonium chloride molecule?
Ionic only
Covalent only
Ionic and dative covalent
Dative covalent only
Correct answer is C
No explanation has been provided for this answer.
10 and 10
9 and 9
11 and 9
9 and 11
Correct answer is D
X- means one excess electron, hence 9 protons while Y +/- means one deficit electron hence 11 protons X and Y = 9 and 11