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Question
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
Solution
Ca + 2H2O → Ca[OH]2 + H2
RELATED QUESTIONS
Indicate which of the following statement is true and which is false:
The hydrogen molecule is monovalent.
Complete and balance the following equation:
H2+____________→ 2HCI
MULTIPLE CHOICE QUESTIONS
The name hydrogen was given by
- Cavendish
- Lavoisier
- Haber
- none of these
MULTIPLE CHOICE QUESTIONS
Which is the lightest of all elements?
- hydrogen
- helium
- lithium
- none of these
FILL IN THE BLANK
In nature, hydrogen occurs as a .................. molecule represented as H2
Write the balanced equation and give your observation when the following metal reacts:
Sodium with cold water
Write the balanced equation and give your observation when the following metal reacts:
Magnesium with boiling water
Correct the following statement:
Hydrogen is dried by passing it through conc. H2SO4.
Give equations for the reactions.
Give balanced equation for the following conversion:
Water gas to hydrogen – industrially.
Give balanced equation for the following conversion:
Iron [III] oxide to iron – using hydrogen.
Give balanced equation for the following conversion:
Nitrogen to a basic gas – 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 |
When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement.
Explain the following:
Two jars of H2 are collected – “one burns quietly and the other does not”.
Write correctly the balanced equation for the following:
‘When zinc filings are added to a concentrated solution of sodium hydroxide’.
Give a reason for the following.
A mixture of hydrogen and chlorine can be separated by passage through a porous pot.
