Advertisements
Advertisements
प्रश्न
Write true or false :
No new substance is formed during a chemical reaction.
पर्याय
True
False
Advertisements
उत्तर
False
APPEARS IN
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
Give a reason.
Wasp sting is treated with vinegar.
FILL IN THE BLANK
In a ............ change, new substances are formed.
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
How is precipitate formation in a chemical reaction indicated?
State four conditions necessary for chemical reactions to take place.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Explain,giving one example of the following chemical changes:
Reversible reaction
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Rusting of iron is ______.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
Write a note on the following:
Curdling of milk
When carbon dioxide is passed through lime water ______.
