Which of the following salts is slightly soluble in water?
AgCl
CaSO4
Na2CO3
PbCl2
Correct answer is B
All sulfates are soluble except those of barium, strontium and lead. Calcium sulfate, silver sulfate and mercurous sulfate are slightly soluble in water, but calcium sulfate is rarely precipitated in reactions between the calcium and sulfate ions.
The colour of methyl orange in alkaline medium is?
yellow
pink
orange
red
Correct answer is A
Methyl orange has the property to color alkaline and neutral water yellow.
Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH?
5.0 cm3
2.5 cm3
0.4 cm3
0.1 cm3
Correct answer is B
No explanation has been provided for this answer.
The acid that is used to remove rust is?
boric
hydrochloric
trioxonitrate (V)
tetraoxosulphate (VI)
Correct answer is B
No explanation has been provided for this answer.
Carbon (II) oxide is considered dangerous if inhaled mainly because it?
can cause injury to the nervous system
competes with oxygen in the blood
competes with carbon (IV) oxide in the blood
can cause lung cancer
Correct answer is B
Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen.