The number of peaks obtained in mass spectrometry shows____________________?

A. Relative abundance
B. Average mass of element
C. Number of isotopes
D. Relative isotopic mass

Molecular mass of water (18g) means__________________?

A. 1-mole molecules of water
B. 1-gram molecule of water
C. 3-gram atoms
D. All

Which of the following statements about isotopes is correct ?

A. Isotopes with odd atomic number are abundant
B. Isotopes with odd atomic number and even mass number are abundant
C. Isotopes with even atomic number and even mass number are abundant
D. Isotopes with even atomic number and odd mass no are abundant

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.

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

A. 280
B. 300
C. 154
D. 54

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

A. Formula unit
B. Empirical formula
C. Molecular formula
D. Formula mass

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

Which one of the following has the maximum number of isotopes ?

A. Oxygen
B. Carbon
C. Tin
D. Chlorine

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

The number of moles of CO2 which contains 16 g of oxygen is__________________?

A. 0.25
B. 0.5
C. 0.75
D. 1