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प्रश्न
Give a word equation for the following reaction.
Two gases which combine to give a solid.
उत्तर
Ammonia + Hydrogen chloride→ Ammonium chloride
NH3 (g) + HCl (g)→NH4Cl (s)
APPEARS IN
संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
How do the following help in bringing about a chemical change?
light.
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
Give reason.
Wasp sting is treated with vinegar.
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 |
What are chemical reactions?
Write true or false :
Hydrogen sulphide has rotten egg smell .
Write true or false .
A black residue is formed when sugar is heated .
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of a reaction where the following are involved
Electricity
Define Photochemical reaction
Give an example
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Name: Gas with rotten egg smell.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
Burning of paper is the best example of ______ change.
