Advertisements
Advertisements
प्रश्न
Write the balanced equation and give your observation when the following metal reacts:
Calcium with cold water
Advertisements
उत्तर
Calcium sinks in water and the reaction is less vigorous.
Ca + 2H2O → Ca(OH)2 + H2(g)
APPEARS IN
संबंधित प्रश्न
Give reason for the following:
A pop sound produced when hydrogen is burnt?
Multiple Choice Question
Hydrogen is responsible for producing
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
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.
Hydrogen sulphide is ______ to sulphur since the reaction involves ______ of hydrogen.
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:
Hydrogen and oxygen
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
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’.
How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis?
What do the following symbols represent : 2H and H2.
Give balanced equation for obtaining hydrogen from cold water using a monovalent active metal.
