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प्रश्न
Write the balanced equation and give your observation when the following metal reacts:
Calcium with cold water
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उत्तर
Calcium sinks in water and the reaction is less vigorous.
Ca + 2H2O → Ca(OH)2 + H2(g)
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संबंधित प्रश्न
Indicate which of the following statement is true and which is false:
The hydrogen molecule is monovalent.
Hydrogen is a good reducing agent: What do you understand by the above statement? Explain with the help of copper oxide as an example.
MULTIPLE CHOICE QUESTIONS
Which is the lightest of all elements?
- hydrogen
- helium
- lithium
- none of these
FILL IN THE BLANK
Hydrogen is present abundantly in the ................
FILL IN THE BLANK
Ammonia is used to make ................
Why is hydrogen called a reducing agent? Give chemical equation to support your answer ?
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 steam
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A metal …………….. hydrogen in the activity series gives hydrogen with …………… acid or …………… acid.
(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).
Correct the following statement:
Hydrogen is dried by passing it through conc. H2SO4.
Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.
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Chlorine is ______ to HCl.
Give a chemical test to distinguish between the following gases:
Ammonia and hydrogen chloride
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Name a gas which burns in air or oxygen forming water.
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis?
Give a reason for the following.
A mixture of hydrogen and chlorine can be separated by passage through a porous pot.
