Question

(d) INDICATE WHICH OF THE FOLLOWING STATEMENTS ARE TRUE AND WHICH ARE FALSE
1. Hydrogen is combust bie as well as a supporter of combustion(. )
2. The position of hydrogen is not fxed in the periodic table[ ]
3.Hydrogen gas is easily liquefiable[. ]4. The reaction between hydrogen and oxygen is exothermie.[ ]5.
Magnesium with dilute HNO3 produces hydrogen( )​

Answer 1

Answer:

1; FALSE   Hydrogen is neither combustible nor a supporter of combustion.

2;TRUE    position of H atom is not fixed in Mandeleev's periodic table due to the resemblance of H with many group in properties

3;FALSE    Hydrogen is highly inflammable and hence storage is difficult. Hydrogen has low critical temperature and hence not easily liquefiable.

4;TRUE       Hydrogen reacts with oxygen to make water. The reaction between hydrogen and oxygen is exothermic

5:TRUE      Magnesium is highly reactive in nature. - When magnesium metal reacts with very dilute nitric acid it gives magnesium nitrate (Mg(NO3)2). Along with magnesium nitrate highly flammable hydrogen gas (H2) is also produced. Thus, magnesium on reaction with very dilute HNO3 gives H2.

Explanation: