1 |
A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed. |
If the paper covers the funnel up to its circumference
If the paper has got small sized pores in it
If the stem of the funnel is large so that it dips into the filtrate
If the paper fits tightly
|
2 |
Gooch crucible is made of. |
Glass
Paper
Teflon
Procelain
|
3 |
The volume occupied by 1.4 g of N2 at S.T.P is |
2.24 dm3
22.4 dm3
1.12 dm3
112 cm3
|
4 |
One mole of SO2 contains |
6.02 x 10<sup>23</sup>atoms of oxygen
18.1 x 10<sup>23</sup>atoms of SO2
6.02 x 10<sup>23</sup>atoms of Sulphur
4 g atoms of SO2
|
5 |
The largest number of molecules are present in |
3.6 of H2O
4.6 g of C2H5OH
2.8 g of CO
5.4 g of N2O5
|
6 |
the number of moles of CO2 which contain 8.0 g of oxygen. |
0.25
0.50
1.0
1.50
|
7 |
Many element have fractional atomic masses. This is because. |
the mass of the atom is itself fractional
Atomic masses are average mases of Isobars
Atomic masses are average masses Isotopes
Atomic masses are average masses of Isotopes proportional to their relative abundance.
|
8 |
The volume occupied by 16 g of CH4 at S.T.P. |
224.14 dm3
22.4 dm3
1.12 dm3
2.24 dm3
|
9 |
Ascorbic acid is vitamin. |
A
B
C
D
|
10 |
the volume occupied by 1.4 of N2 at S.T.P is |
2.24 dm3
22.4 dm3
1.12 dm3
112 cm3
|
11 |
27g of Al will react completely with how much mass of O2, to produce Al2O3. |
8 g of oxygen
16 g of oxygen
32 g of oxygen
24 g of oxygen
|
12 |
The mass of two moles of electrons is |
1.10 mg
1.008 mg
0.184 mg
1.673 mg
|
13 |
The mass of one mole of electrons is. |
1.008 mg
0.55 mg
0.184 mg
1.673 mg
|
14 |
The Number of moles of CO2 which contain 8.0 of oxygen. |
0.25
0.15
0.35
1.45
|
15 |
During combustion analysis, CO2 produced is absorbed in |
Mg (CLO4)2
50% KOH
CaCl2
P2O5
|
16 |
Isotopes differ in. |
Properties which depend upon mass
Arrangement of electrons in orbitals
Chemical properties
None of these
|
17 |
The element nickel has isotopes. |
3
2
5
7
|