The following data are obtained when dinitrogen and dioxygen react together to form different compounds :
`{:(,"(i)","(ii)","(iii)","(iv)"),("Mass of dinitrogen ",14,14,28,28),("Mass of dioxygen ",16,32,32,80):}`
Which law of chemical combination is obeyed by the above experimental data ? Give its statement.

The following data are obtained when dinitrogen and dioxygen react to gether to form different compounds: {:(,,"Mass of dinitrogen",,"Mass of dioxygen"),(i.,,14 g,,16 g),(ii.,,14 g,,32 g),(iii.,,28 g,,32 g),(iv.,,28 g,,80 g):} a. Which law of chemical combination is obeyed by the above experimental data? Give its statement. b. Fill in the blanks in the following conversions: I. 1 km= ....... mm= ......pm II. 1 mg= ........ kg= ......... ng III. 1 mL= ........ L= ......... dm^(3)

The following data are obtained when dinitrogen and dioxygen react together to form different compounds: Which law of chemical combination is obeyed by the above experimental data ?

The % compostion of four hydro carbons is as follows : {:((i),(ii),(iii),(iv),),(75,80,85.7,91.3,%C),(25,20,14.3,8.7,%H):} The data illustrates the law of

A student collected three samples of water from different sources and found out the percentage of hydrogen and oxygen by mass in thse samples. It should have been 1 : 8 by mass. But it was different in all three samples, Moreover, the values did not match (i) In your opinion why did the student get different results for different samples ? (ii) What should have been done by him ? (iii) Which law of chemical combination is supported by these observations (iv) How will you check the purity of water in the laboratory ?

Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g sodium hydroxide to form 9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Which law of chemical conbination is illustrated by this data ? Give reason for your choice.

Two substances X and Y are colourless gases and are formed by the combination of sulphur and oxygen. Substance X is obtained by the combination of 6.0 g of sulphur of 6.0 g of sulphur with 6.0 g of oxygen. Substance Y is formed when 8.6 g of sulphur and 12.9 of oxygen combine. (a) What is the mass ratio of the elements in the two substances ? (b) Which law of chemical combination does it support ? (c) Give the statement of the law.

Which of the following is /are true when HCl (g) is passed through water? (i) It does not ionise in the solution as it is a covalent compound . (ii) It ionises in the solution. (iii) It gives both hydrogen and hydroxyl ion in the solution (iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.