Advertisements
Advertisements
Question
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Advertisements
Solution
Molybdenum increases the efficiency of the catalyst iron used in the manufacture of ammonia.
APPEARS IN
RELATED QUESTIONS
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
FILL IN THE BLANK
Positively charged ions are called ........
What do you observe when Cobalt chloride paper is introduced in water vapour.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write the chemical reaction of baking soda with lemon.
