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Chemistry
UTME / JAMB 2022
Water and Solubility Concept
Solution
Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
A
prevent goiter
B
prevent tooth decay
C
remove odour
D
kill germs
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Water and Solubility Concept
Solution
What volume of (dm\(^3\)) of water will be added to 10dm\(^3\) of 2.0 mol/dm\(^3\) HCL acid solution to give a final solution of 0.5 mol/dm\(^3\)?
A
30
B
40
C
20
D
50
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2021
Water and Solubility Concept
Solution
A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage
A
11.%
B
22.2%
C
10%
D
20%
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2019
Water and Solubility Concept
Solution
The properties of a good primary standard solution include the following except?
A
High molecular mass
B
low molecular mass
C
high degree of purity
D
readily available
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2018
Water and Solubility Concept
Solution
Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?
A
Spring water
B
River water
C
Tap water
D
Sea water
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2010
Water and Solubility Concept
Solution
Permanent hardness of water can be removed by?
A
filtration
B
adding slaked lime
C
adding caustic soda
D
boiling
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2010
Water and Solubility Concept
Solution
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
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2008
Water and Solubility Concept
Solution
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove?
A
large particles
B
germs
C
fine particles
D
odour
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2002
Water and Solubility Concept
Solution
The furring of kettles is caused by the presence in the water of?
A
Calcium tetraoxosulphate (VI)
B
Calcium hydrogentrioxocarbonate (IV)
C
Calcium hydroxide
D
Calcium trioxocarbonate (IV)
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1997
Water and Solubility Concept
Solution
A major process involved in the softening of hard water is the?
A
conversion of a soluble calcium salt to its trioxoncarbonate (lV)
B
decomposition of calcium trioxocarbonate (lV)
C
conversion of an insoluble calcium salts to its trioxocarbonate (lV)
D
oxidation of calcium atoms to its ions
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1995
Water and Solubility Concept
In general, an increase in temperature increases the solubility of a solute in water because?
A
more solute molecules collide with each other
B
most solutes dissolve with the evoltion of heat
C
more solute molecules dissociate at hihger temperatures
D
most solutes dissolve with absorption of heat
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1991
Water and Solubility Concept
Solution
The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturated at 100°C were cooled to 30°C ?
A
57.5
B
42.2
C
28.6
D
14.3
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1979
Water and Solubility Concept
Solution
12 g of solid protassium chlorate (KCIO) were added to 40 g of water and heated to dissolve all the solid. As the solution cools, crystals of potassium chlorate at 66 oC. The solubility of potassium chlorate at 66 oC is therefore?
A
66
B
33
C
10
D
20
E
30
medium Difficulty
Study Explanation