1.
A compound having the empirical formula (C3H4O) has a molecular weight of 168. The molecular formula of this compound is –
2.
A piece of sodium weighs 0.023 g. The number of atoms present in it are
3.
Read the Question given below
4.
The hemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight. The molecular weight of hemoglobin is 67,200. The number of iron atoms in each molecule of hemoglobin is (Atomic weight of iron = 56):
5.
Ritish needs 1.71 g of sugar (C12H22O11) to sweeten his tea. What would be the number of carbon atoms present in his tea?
6.
Insulin contains 3.4% sulphur. The minimum molecular weight of insulin is –
7.
The hydrogen phosphate of a metal has the formula MHPO4. The formula of its chloride would be
8.
X and Y atoms have 2 and 6 valence electrons in their outermost shells respectively. The compound which X and Y are likely to form is –
9.
The largest number of molecules among the following is –
10.
Number of molecules present in 0.18 g H2O are
