Question

B. Fill in the blanks.
1. Hydrogen gas is__________
to litmus.
2. Hydrogen is_____________
than air.
3. Hydrogen has________ melting and boiling points.
4. Water reacts with metals to produce_______gas
5. Hydrogen has_____ isotopes
6. Air is_______ times heavier than hydrogen
gas​

Answer 1

1. neutral

2. lighter

3. low

4. hydrogen

5. three

6. 29

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