Given the numbers: 161cm, 0.161cm, 0.0161 cm. The number of significant figures for the three numbers are
3, 4 and 5 respectively
3, 3 and 3 respectively
3, 3 and 4 respectively
3, 4 and 4 respectively
Significant figures in 0.00051 are
5
3
2
4
Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates
Law of reciprocal proportions
Law of constant proportions
Law of multiple proportions
Law of equivalent proportions
40.3
36.3
24.3
11.3
100
150
120
200
Which of the following has smallest number of molecules
22.4 L
2.24 L
0.224 L
0.1 L
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
None of these
An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of compound is
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is
6
1
4
2
272 g
403 g
528 g
1056 g
40 ml
20 ml
10 ml
4 ml
18.0
27.9
1.0
10.0