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प्रश्न
Explain the following:
Two jars of H2 are collected – “one burns quietly and the other does not”.
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उत्तर
‘One burn quietly’ is pure hydrogen, and ‘which does not bum quietly’ is mixed hydrogen with air. It explodes on burning.
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संबंधित प्रश्न
Indicate which of the following statement is true and which is false:
The hydrogen molecule is monovalent.
Indicate which of the following statement is true and which is false:
Hydrogen gas is easily liquefiable.
State four uses of hydrogen:
Multiple Choice Question
Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare
Multiple Choice Question
Hydrogen is responsible for producing
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
FILL IN THE BLANK
Ammonia is used to make ................
Write the balanced equation and give your observation when the following metal reacts:
Magnesium with boiling water
Write the balanced equation and give your observation when the following metal reacts:
Magnesium with steam
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 balanced equation for the following conversion:
Iron [III] oxide to iron – using hydrogen.
Give reason for the following:
The reaction of chlorine with hydrogen sulphide is deemed a redox reaction.
What do the following symbols [or formula] denote : 2H ; H2 ; H+. [two atoms, molecule, ion]
Name a gas which burns in air or oxygen forming water.
Write correctly the balanced equation for the following:
‘When zinc filings are added to a concentrated solution of sodium hydroxide’.
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
What do the following symbols represent : 2H and H2.
Give balanced equation for obtaining hydrogen from cold water using a divalent active metal.
