1.0 mol dm-3
2.0 mol dm-3
4.0 moldm-3
5.0 moldm-3
Correct answer is B
50.5g 0f salt X is contained in 250cm3,
what mass of X is contained in 1000cm3
= (50.5 x 1000) ÷ 250 = 202g
no of moles of salt x = mass÷ molar mass
= 202÷ 101 = 2.0mol/dm3
Which of the following metallic oxides is amphoteric?
AI2O3
Fe2O3
MgO
Na2O
Correct answer is A
No explanation has been provided for this answer.
When NH 4CI was dissolved in water, the container was cold to touch. This implies that
the process is endothermic
the process is exothermic
NH4CI is highly soluble in water
NH 4CI forms a saturated solution
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements about enthalpy of neutralization is correct? It
is constant for a strong acid and a strong base
cannot be determined using calorimeter
has a positive value
is higher for strong acid and a weak base
Correct answer is A
No explanation has been provided for this answer.
colourless
orange
pink
yellow
Correct answer is C
Phenolphthalein is one of the most commonly-used indicators in neutralisation titration.
Phenolphthalein is naturally colorless but turns pink in alkaline solutions.