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 1:
X is a substance which liberates CO on treatment with concentrated HSO. A warm solution of X can decolorize acidified KMnO. X is
Options:
A) HCOOH
B) NaHCO
C) FeCO
D) HCO
Show Answer
The correct answer is D .
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Question 2:
Which of the following statements is true?
Options:
A) Metals conduct electricity while non-metals do not
B) Metals have high density, non-metals have low density
C) Metals form basic oxides, non-metals form acidic oxides
D) In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
E) Metals lose elections while non-metals gain electron during normal reactions
Show Answer
The correct answer is E .
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Question 3: In the oil drop experiment, Millikan determined the?
Options:
A) charge to mass ratio of the electron
B) mass of the electron
C) charge of the electron
D) mass of the proton
Show Answer
The correct answer is C .
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Question 4: You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely
Options:
A) pass each gas into lime water
B) pass each gas into water and test with litmus paper
C) pass each gas into concentrated sulphuric acid
D) expose each gas to atmospheric air
E) expose each gas to fumes of hydrogen chloride
Show Answer
The correct answer is A .
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Question 5:
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol-1 ]
Options:
A) 24 125 coulombs
B) 48 250 coulombs
C) 72 375 coulombs
D) 96 500 coulombs
Show Answer
The correct answer is B .
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Question 6: A common characteristic shared by iron and aluminium is that both?
Options:
A) are extracted by reduction methods
B) form only basic oxides
C) show oxidation states of +2 and +3
D) form soluble hydroxides
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The correct answer is A .
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Question 7: Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has
Options:
A) more molecules
B) more atoms
C) larger surface area
D) relatively large mass
Show Answer
The correct answer is C .
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Question 8: The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is
Options:
A) dissolution → dryness → filtration → evaporation
B) filtration → sublimation → evaporation → dryness
C) sublimation → dissolution → filtration → evaporation
D) dissolution → filtration → sublimation → evaporation
Show Answer
The correct answer is C .
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Question 9: The gas that will form a white precipitate with acidified silver trioxonitrate (v) is
Options:
A) NH3
B) SO2
C) CO2
D) HCL
Show Answer
The correct answer is D .
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Question 10: 3. 06 g of a sample of potassium trioxochlorate (V) (KCIO) was required to make a saturated solution with 10cm3 of water at 25oC. The solubility of the salt at 25oC is [K =39, Cl = 35.5, O = 16]
Options:
A) 5.0 moles dm3
B) 3.0 moles dm3
C) 2.5 moles dm3
D) 1.0 molesv
E) 0.5 moles dm3
Show Answer
The correct answer is C .