Advertisements
Advertisements
प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
Advertisements
उत्तर
An antacid neutralizes stomach acidity.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
What are oxides ?
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
Define chemical reaction.
Explain the following reaction with one suitable example of Double decomposition reaction.
Explain by writing a word equation.
Respiration is a chemical change.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Explain the term reactant and product giving examples.
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe? When
Water is added to the quick lime.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
Beating an egg to make a cake is a ______.
Heat may evolve or be absorbed during a ______ change.
