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प्रश्न
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
उत्तर
‘Word equation’
Sodium hydroxide + zinc → Sodium zincate + hydrogen
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संबंधित प्रश्न
Indicate which of the following statement is true and which is false:
Hydrogen is combustible as well as a supporter of combustion.
Give a balanced chemical equation for the reaction.
Hydrogen is a good reducing agent: What do you understand by the above statement? Explain with the help of copper oxide as an example.
State four uses of hydrogen:
Multiple Choice Question
Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare
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
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).
With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer.
Chlorine is ______ to HCl.
Select the correct options for the following statement:
The gas which has now replaced hydrogen in air balloons is ___.
Give a chemical test to distinguish between the following gases:
Ammonia and hydrogen chloride
Write balanced equation for the following reaction:
magnesium + dil. hydrochloric acid → ___
Write correctly balanced equation for the following:
When steam is passed over red hot iron.
Write correctly the balanced equation for the following:
‘When zinc filings are added to a concentrated solution of sodium hydroxide’.
Give balanced equation for obtaining hydrogen from cold water using a divalent active metal.
Give a reason for the following.
A mixture of hydrogen and chlorine can be separated by passage through a porous pot.
