Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 101: When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?
Options:
A) turn moist red litmus paper blue
B) turn lime water milky
C) blacken lead acurate paper
D) rekindle a glowing splint
E) burn a sqeakly pop
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The correct answer is C .
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Question 102: Proteins in acid solution undergo
Options:
A) Polymerization
B) Substitution
C) Fermentation
D) Hydrolysis
Show Answer
The correct answer is D .
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Question 103: The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the
Options:
A) water vapour in the air around the bottle gains some energy from the bottle
B) temperature of the milk drops as it loses heat into the surroundings
C) saturated vapour pressure of the milk is equal to the atmospheric pressure
D) water vapour in the air around the bottle loses some of its energy to the bottle
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The correct answer is D .
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Question 104: Which of the following is used in fire extinguishers?
Options:
A) Carbon (ll) oxide
B) Carbon (lV) oxide
C) Sulphur (lV) oxide
D) Ammonia
Show Answer
The correct answer is B .
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Question 105: In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
Options:
A) One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
B) Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
C) One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water
D) One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water
E) One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water
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The correct answer is E .
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Question 106:
The situation obtained when a perfect gas expands into a vacuum is
Options:
A) ΔH is positive and TΔ S is zero
B) ΔH is positive and T Δ S is negative
C) ΔH is negative and TΔ S is zero
D) ΔH is zero and T Δ S is positive
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The correct answer is D .
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Question 107: If glucose is heated on the concentration tetraoxosulphate(iv)acid, it will be dehydrated
Options:
A) carbon
B) carbon(iv)oxide
C) ethane
D) ethanol
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The correct answer is A .
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Question 108: 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 ?
Options:
A) 57.5
B) 42.2
C) 28.6
D) 14.3
Show Answer
The correct answer is D .
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Question 109: Alkanols have the general molecular formula
Options:
A) C1H2n-2
B) C1H2n-1CHO
C) C1H2n-2OH
D) C2H2n+1OH
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The correct answer is D .
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Question 110: Water has the ability to dissolve almost all substance because its molecules has a structure with
Options:
A) one positive end and one neutral end
B) one positive end and one negative end
C) two negative ends
D) two positive ends
Show Answer
The correct answer is B .