The density of 3m solution of Nacl is 1.25g ml-1 calculate molarity of the solution.
2.10 mol/kg
3.7 mol/kg
2.79 mol/kg
2.9 mol/kg
Calculate the amount of water (g) produced by the combustion of 16g of methane.
36g
32g
28g
20g
Which of the following is/an pure substance.
Blood
Carbon
Steel
None of these
How many different elements are known to exist?
140
160
110
115
He, Ar, Kr, Na, K are
Monoatomic
Triatomic
Diatomic
Pentatonic
How many mole of methane are required to produce 22g of CO2 (g) after combustion?
.25
.375
0.5
.10
How many significant figures are present in 0.0048
2
3
4
5
_________are those which do not have same composition throughout.
Homogeneous mixtures
Heterogeneous mixtures
Salt mixtures
Monoform
"matter can be neither be created nor be destroyed" is:?
Conservation of energy
Conservation of mass
Conservation of water
