Everyday Science MCQs

5120 MCQs  (Page 221 of 512)

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How many moles are in 22.2 grams of Calcium chloride, CaCl2?
A. 0.2 moles
B. 0.3 moles
C. 0.4 moles
D. 0.5 moles
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What is the mass percent of silver in silver notrate, AgNO3?
A. 64.5%
B. 65.6%
C. 63.5%
D. 61.5%
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A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?
A. 74% fe
B. 75% fe
C. 77% fe
D. 78% fe
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A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?
A. C2h6o
B. C6h18o3
C. C6h12o6
D. C2h5o
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A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?
A. C2h4
B. C3h6
C. C4h8
D. C5h10
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What is the density ofargon gas at a temperature of 30°C and a pressure of 1.05 atm?
A. 1.65 g/l
B. 1.67 g/l
C. 1.68 g/l
D. None of the above
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The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in__________?
A. 1.8 gram of h2o
B. 12 moles of kmno4
C. 0.6n h2so4
D. 4.6 gram of c2h5oh
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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?
A. Argon
B. Xenon
C. Helium
D. Krypton
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The formula C6H5-CO-CH3 represents_______ ?
A. Acetone
B. Acetic acid
C. Acetophenone
D. Phenyl acetate
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Poisonous gas present in the exhaust fumes of a jet plane is__________?
A. Flurocarbon
B. Carbon monoxide
C. Methane
D. C2h2
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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