CO2 is the chemical formula of carbon dioxide. What is the ration of carbon and oxygen in carbon dioxide?
a) 3:1
b) 2:1
c) 1:2
d) 1:1
The symbol of sodium is……..
a) Ni
b) Ne
c) N
d) Na
Which of the following is an element?
a) carbon dioxide
b) water
c) copper
d) salt
Sugar is a compound of ……….
a) carbon, hydrogen, oxygen
b) hydrogen, oxygen, sodium
c) calcium, carbon, oxygen
d) molecule, atom, compound
Which of the following is a compound?
a) Cl
b) C
c) NaCl
d) O2
Sodium and chlorine combine to form…….
a) sand
b) chalk
c) sugar
d) salt
