The number of moles of CO2 which contains 16 g of oxygen is__________________? A. 0.25B. 0.5 C. 0.75 D. 1

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

Which one of the following has the maximum number of isotopes ? A. oxygen B. carbonC. tin D. chlorine

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 of the following terms is not used for ionic compound ? A. formula unit B. empirical formulaC. molecular formula D. formula mass

The number of isotopes of elements with even mass number and even atomic number are ________________? A. 280 B. 300C. 154 D. 54

One mole of CO2 contains? A. 6.022 x 1023 atoms of oxygen B. 22-gram electrons C. 6.022 x 1023 atms of carbonD. both B. & C.

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 abundantC. Isotopes with even atomic number and even mass number are…

Molecular mass of water (18g) means__________________? A. 1-mole molecules of water B. 1-gram molecule of water C. 3-gram atomsD. all

Empirical formula of chloroform is____________________? A. CH2 C12 B. CH3C1 C. CC14D. CHCL3 Chloroform is a colorless, sweet-smelling organic compound with the IUPAC name Trichloromethane and formula CHCl3. Chloroform can daze or knock out people even when it’s consumed in…