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.
Coffee stains can best be removed by?
Kerosine
turpentine
a solution of borax in water
ammonia solution
Correct answer is C
Borax solution refers to sodium borax in water. it is used for cleaning purposes. borax is mildly alkaline and can help break down acidic stains, such as those from coffee
Which of the following is incorrect?
Nigeria was removed at first from Common Wealth during Abacha's regime
Nigeria was at first bombarded in 1951
Sierra Leone was never colonized
Ethiopia was never colonized
Correct answer is C
Sierria used to be a colonial terriotry of the Great Britain, She gained her independence in 1956.
4.00
2.50
0.40
0.25
Correct answer is B
Solubility = \(\frac{\text{number of moles of solution}}{\text{vol of solution}}\)
100g of water = 100 cm\(^3\) = 0.1 dm\(^3\).
CuSO\(_4\) = 160 g/mol
No of moles of CuSO\(_4\) in 40g = \(\frac{40}{160}\)
= 0.25 mol.
Solubility = \(\frac{0.25}{0.1}\)
= 2.5 moldm\(^{-3}\).
Substance employed as drying agents are usually?
amphoteric
hygroscopic
efflorescent
acidic
Correct answer is B
No explanation has been provided for this answer.