Everyday Science MCQs

5120 MCQs  (Page 158 of 512)

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One mole of CO2 contains?
A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atms of carbon
D. Both b. & c.
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The number of isotopes of elements with even mass number and even atomic number are ________________?
A. 280
B. 300
C. 154
D. 54
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Which of the following terms is not used for ionic compound ?
A. Formula unit
B. Empirical formula
C. Molecular formula
D. Formula mass
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moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?
A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole
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Which one of the following has the maximum number of isotopes ?
A. Oxygen
B. Carbon
C. Tin
D. Chlorine
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The volume occupied by 2.8 g of N2 at STP______________________?
A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3
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The number of moles of CO2 which contains 16 g of oxygen is__________________?
A. 0.25
B. 0.5
C. 0.75
D. 1
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How many isotopes have odd atomic number ?
A. 154
B. 280
C. 86
D. 300
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Percentage of calcium in calcium carbonate is___________________?
A. 80%
B. 30%
C. 40%
D. 20%
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Isotopes of the same elements has__________________?
A. Different number of protons
B. Same number of neutrons
C. Different number of neutrons
D. Same mass number (nucleon number)
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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