Advertisements
Advertisements
Question
Helium is preferred to hydrogen for filling balloons because it is:
Options
lighter than air
almost as light as hydrogen
non-combustible
inflammable
Advertisements
Solution
non-combustible
APPEARS IN
RELATED QUESTIONS
Which metal is preferred for collecting hydrogen from:
Write the balanced equation
Hot water
Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
When hydrogen is passed over a black solid compound A, the products are a 'colorless liquid' and a 'reddish-brown metal B'.
Substance B is divided into two parts each placed in separate test tubes.
Dilute HCl is added to one part of substance B and dilute HNO3 to the other.
- Name the substances A and B.
- Give two tests for the colourless liquid formed in the experiment.
- What happens to substance A when it reacts with hydrogen? Give reasons for your answer.
- Write an equation for the reaction between hydrogen and substance A.
- Is there any reaction between substance B and dilute hydrochloric acid? Give reasons for your answer.
Give a reason for the following.
Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.
Which metal gives hydrogen with all of the following: water, acids, alkalis?
Correct the following statement:
Very dilute nitric acid reacts with iron to produce hydrogen.
Give a chemical test to distinguish between the following gases:
Hydrogen chloride and hydrogen sulphide
Using dilute sulphuric acid how would you differentiate between:
Copper and magnesium
How would you identify the gaseous products evolved.
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
Name the following.
The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis.
