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 2101:
How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 mol]
Options:
A) 1.20 x 10
B) 2.4 x 10
C) 1.51 x 10
D) 3.02 x 10
Show Answer
The correct answer is C .
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Question 2102: Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of
Options:
A) Ca(OH)2
B) CaCO3
C) CaHCO3
D) CaSO4
E) N2CO3
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The correct answer is A .
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Question 2103: Which of the following is used to hasten the ripening of fruit?
Options:
A) Ethene
B) Ethanol
C) Ethyne
D) Ethane
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The correct answer is A .
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Question 2104: When stem is passed over red hot carbon the substances produced are
Options:
A) hydrogen and trioxocarbonate (IV) acid
B) hydrogen, oxygen and carbon (IV) oxide
C) hydrogen and carbon (ii) oxide
D) hydrogen and carbon (IV) oxide
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The correct answer is C .
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Question 2105: An emulsion paint consists of ?
Options:
A) gas or liquid particles dispersed in liguid
B) liquid particles dispersed in liquid
C) solid particles dispersed in liquid
D) solid particles dispersed in solid
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The correct answer is B .
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Question 2106: The molecular lattice of iodine is held together by
Options:
A) dative bond
B) metallic bond
C) hydrogen bond
D) van der Waal's forces
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The correct answer is D .
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Question 2107:
Which of the following gases contains the least number of atoms at s.t.p?
Options:
A) 1 mole of butane
B) 4 moles of chlorine
C) 3 moles of ozone
D) 7 moles of argon
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The correct answer is A .
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Question 2108: When calcium oxide is heated with carbon, the oxide will
Options:
A) be converted to carbide
B) be converted to the trioxocarbonate (IV) salt
C) decompose to the metal
D) melt,producingg carbon (IV) oxide
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The correct answer is A .
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Question 2109:
A chemical widely used as a fertilizer is?
Options:
A) galena
B) bauxite
C) emerald
D) nitrochalk
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The correct answer is D .
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Question 2110: Increasing the pressure of a gas
Options:
A) lowers the average kinetic energy of the molecules
B) decreases the density of the gas
C) decreases the temperature of the gas
D) increases the density of the gas
E) increases the volume of the gas
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The correct answer is D .