57.5
42.2
28.6
14.3
Correct answer is D
solute + solvent = solution
at 100oC; 75g + 100g = 175g
at30oC; \(\frac{25g}{50g}\) + 100g = 125g
From 100oC - 30oC; 175g CuSO4 ppt 50g
From 100oC - 30oC; 50g CuSO4 ppt \(\frac{50 \times 50}{175}\) = 14.3
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.