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Question
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
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Solution
Ca + 2H2O → Ca[OH]2 + H2
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Complete and balance the following equation:
H2+____________→ 2HCI
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Helium replaced hydrogen in weather observation balloons?
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Multiple Choice Question
Hydrogen is
MULTIPLE CHOICE QUESTIONS
Which is the lightest of all elements?
- hydrogen
- helium
- lithium
- none of these
Give the balanced equation of the reaction.
Choose terms from the options given in brackets to complete this sentence.
A metal …………….. hydrogen in the activity series gives hydrogen with …………… acid or …………… acid.
(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).
Give equations for the reactions.
Using a burning candle and a jar of hydrogen – how would you prove experimentally that Hydrogen does not support combustion.
Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.
Give balanced equation for the following conversion:
Iron [III] oxide to iron – using hydrogen.
Match the statements in List I with the appropriate answer in List II.
| List I | List II |
| 1. An atom of hydrogen | A: Chromic oxide |
| 2. A strong oxidising agent | B: Ammonia |
| 3. A promoter used in Bosch process | C: Iron |
| 4. A chemical used in the manufavture of fertilizers | D: One electron |
| 5. The catalyst used in production of a basic gas from nitrogen. | E: Dilute nitric acid |
Give a chemical test to distinguish between the following gases:
Hydrogen and oxygen
Write balanced equation for the following reaction:
magnesium + dil. hydrochloric acid → ___
What do you observe when a piece of sodium is dropped into cold water?
Give balanced equation for obtaining hydrogen from cold water using a monovalent active metal.
Select the correct answer from the symbol in the bracket.
The element, which like hydrogen has one valence electron.
