Chemistry, 2010, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2010

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

11 - 20 of 49 Questions

#	Question	Ans
11.	A noble gas with a high power of fog penetration used in aerodrome beacons is? A. krpton B. argon C. helium D. neon Show Content Detailed Solution There is an explanation video available below.	D
12.	Permanent hardness of water can be removed by? A. filtration B. adding slaked lime C. adding caustic soda D. boiling Show Content Detailed Solution - this hardness cannot be removed by boiling. We can remove this hardness by treating the water with washing soda, caustic soda and permutit There is an explanation video available below.	C
13.	Substance employed as drying agents are usually? A. amphoteric B. hygroscopic C. efflorescent D. acidic Show Content Detailed Solution There is an explanation video available below.	B
14.	Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120°C? [Cu = 64, S = 32, O = 16] A. 4.00 B. 2.50 C. 0.40 D. 0.25 Show Content Detailed Solution 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\(^{-3}\). There is an explanation video available below.	B
15.	Coffee stains can best be removed by? A. Kerosine B. turpentine C. a solution of borax in water D. ammonia solution Show Content Detailed Solution There is an explanation video available below.	C
16.	Carbon (II) oxide is considered dangerous if inhaled mainly because it? A. can cause injury to the nervous system B. competes with oxygen in the blood C. competes with carbon (IV) oxide in the blood D. can cause lung cancer Show Content Detailed Solution Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen. There is an explanation video available below.	B
17.	The acid that is used to remove rust is? A. boric B. hydrochloric C. trioxonitrate (V) D. tetraoxosulphate (VI) Show Content Detailed Solution There is an explanation video available below.	B
18.	Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH? A. 5.0 cm³ B. 2.5 cm³ C. 0.4 cm³ D. 0.1 cm³ Show Content Detailed Solution There is an explanation video available below.	B
19.	The colour of methyl orange in alkaline medium is? A. yellow B. pink C. orange D. red Show Content Detailed Solution Methyl orange has the property to color alkaline and neutral water yellow. There is an explanation video available below.	A
20.	Which of the following salts is slightly soluble in water? A. AgCl B. CaSO₄ C. Na₂CO₃ D. PbCl₂ Show Content Detailed Solution 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. There is an explanation video available below.	B

11.	A noble gas with a high power of fog penetration used in aerodrome beacons is? A. krpton B. argon C. helium D. neon Show Content Detailed Solution There is an explanation video available below.	D
12.	Permanent hardness of water can be removed by? A. filtration B. adding slaked lime C. adding caustic soda D. boiling Show Content Detailed Solution - this hardness cannot be removed by boiling. We can remove this hardness by treating the water with washing soda, caustic soda and permutit There is an explanation video available below.	C
13.	Substance employed as drying agents are usually? A. amphoteric B. hygroscopic C. efflorescent D. acidic Show Content Detailed Solution There is an explanation video available below.	B
14.	Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120°C? [Cu = 64, S = 32, O = 16] A. 4.00 B. 2.50 C. 0.40 D. 0.25 Show Content Detailed Solution 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\(^{-3}\). There is an explanation video available below.	B
15.	Coffee stains can best be removed by? A. Kerosine B. turpentine C. a solution of borax in water D. ammonia solution Show Content Detailed Solution There is an explanation video available below.	C

16.	Carbon (II) oxide is considered dangerous if inhaled mainly because it? A. can cause injury to the nervous system B. competes with oxygen in the blood C. competes with carbon (IV) oxide in the blood D. can cause lung cancer Show Content Detailed Solution Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen. There is an explanation video available below.	B
17.	The acid that is used to remove rust is? A. boric B. hydrochloric C. trioxonitrate (V) D. tetraoxosulphate (VI) Show Content Detailed Solution There is an explanation video available below.	B
18.	Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH? A. 5.0 cm³ B. 2.5 cm³ C. 0.4 cm³ D. 0.1 cm³ Show Content Detailed Solution There is an explanation video available below.	B
19.	The colour of methyl orange in alkaline medium is? A. yellow B. pink C. orange D. red Show Content Detailed Solution Methyl orange has the property to color alkaline and neutral water yellow. There is an explanation video available below.	A
20.	Which of the following salts is slightly soluble in water? A. AgCl B. CaSO₄ C. Na₂CO₃ D. PbCl₂ Show Content Detailed Solution 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. There is an explanation video available below.	B