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Computer MCQS

Sciences MCQS

1.
Mass spectrometer is used to determine Mass number of isotopes and___________________?

Atomic number

Relative abundance

Electronic configuration

All of the above

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2.
The number of peaks obtained in mass spectrometry shows____________________?

Relative abundance

Average mass of element

Number of isotopes

Relative isotopic mass

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4.
Molecular mass of water (18g) means__________________?

1-mole molecules of water

1-gram molecule of water

3-gram atoms

All

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5.
Which of the following statements about isotopes is correct ?

Isotopes with odd atomic number are abundant

Isotopes with odd atomic number and even mass number are abundant

Isotopes with even atomic number and even mass number are abundant

Isotopes with even atomic number and odd mass no are abundant

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6.
One mole of CO2 contains?

6.022 x 1023 atoms of oxygen

22-gram electrons

6.022 x 1023 atms of carbon

Both B. & C.

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7.
The number of isotopes of elements with even mass number and even atomic number are ________________?

280

300

154

54

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8.
Which of the following terms is not used for ionic compound ?

Formula unit

Empirical formula

Molecular formula

Formula mass

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9.
moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

0.18 mole

0.27 mole

0.24 mole

0.09 mole

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11.
The volume occupied by 2.8 g of N2 at STP______________________?

2.24 dm3

22.4 dm3

1.12 dm3

112 dm3

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15.
Mostly elements have fractional atomic masses because of______________________?

Mass of an atom itself is in fraction

Atomic masses are average masses of isobars

Atmoic masses are average masses of isotopes proportional to their relative abundance

Atmoic masses are average masses of isotopes

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