Advertisements
Advertisements
प्रश्न
The chemical reaction between quicklime and water is characterised by:
(a) evolution of hydrogen gas
(b) formation of slaked lime precipitate
(c) change in temperature of mixture
(d) change in colour of the product
उत्तर
(c) change in temperature of mixture
Reaction of quicklime and water is highly exothermic, i.e., it evolves heat energy and changes the temperature of mixture.
APPEARS IN
संबंधित प्रश्न
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are compounds.
Name the various types of chemical reactions.
Write symbolic representation for the following word equation and balance them :
Calcium carbonate → Calcium oxide + Carbon dioxide.
Write the chemical equation for the following word equation and balance them.
Nitrogen + Oxygen → Nitrogen monoxide
Balance the following equation:
Zn + KOH → K2ZnO2 + H2
Give a balanced equation for addition of iron to copper [II] sulphate solution. State the change in colour seen.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Write the word equation for the above molecular equation.
Balance the following simple equation:
K + H2O → KOH + H2
Which of the following is not a physical change?
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
