Question

E
XERCISE
Multiple Choice Questions (MCO)
1. An element is made up of
one kind of atoms
different kinds of molecules
2. Which of the following is a compound?
different kinds of atoms
b.
d.
none of these
b.
S
sand
b.
N
NaCl
d.
3. Which of the following is a mixture?
NaCl+ CaCO
H
d.
4. Which of the following is a homogeneous mixture of two solids?
air
b. brass
graphite d. nitrogen
5. Which of the following technique to be used to separate chalk from the mixture of chalk and water?
filtration b. sedimentation c.
evaporation d. sieving
Na₂CO₃
none of these
a.
C.​

Answer 1

Answer:

1, one kind of atoms

2,NaCl

3,NaCl+CaCo

4,brass

5,I am not sure but I think evaporation