Advertisements
Advertisements
प्रश्न
What does the symbol (aq) represent in a chemical equation?
Advertisements
उत्तर
In some chemical equations, (aq) is written as a symbol after a few reactants or products. This simply represents that we have used the chemicals with water. For example, consider the following chemical reaction:
\[\ce{Ag^+_{ (aq)} + Cl^-_{ (aq)} -> AgCl_{(s)}}\]
In the above reaction, silver and chlorine are used in aqueous solution to form solid Silver chloride.
APPEARS IN
संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Translate the following statement into chemical equation and then balance it.
Hydrogen gas combines with nitrogen to form ammonia
How will you indicate the following effect in a chemical equation?
A solution made in water.
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
- Name any two metals which can behave like metal X.
- Name any two acids which can behave like acid Y.
- Name the gas Z.
- Is the gas Z lighter than or heavier than air?
- Is the reaction between metal X and dilute acid Y exothermic or endothermic?
- By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
Write word equation for the following skeletal equation:
\[\ce{AgBr -> Ag + Br2}\]
Balance the following equation. Also name the product formed.
`"NaNO"_3 → "NaNO"_2 + "O"_2` Name of product (s)
Write your observation and name the product when zinc reacts with dilute hydrochloric acid.
Choose the correct answer from the options given below.
The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is
Write the balanced chemical equation of the following reaction.
iron pyrites(FeS2) + oxygen → ferric oxide + sulphur dioxide
Write the balanced chemical equation of the following reaction.
sodium chloride + manganese dioxide + sulphuric acid → sodium hydrogen sulphate + manganese sulphate + water + chlorine.
Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________
Write word equation for the following molecular equation:
Na2SO3 + 2HCl [dil.] → 2NaCl + H2O + SO2 [g]
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – copper carbonate.
Name the following:
Two non-metal which react explosively when brought in close contact.
Give an example of a chemical equation in which two reactants form:
three product
Give an example of a chemical equation in which two reactants form:
four product
Balance the following simple equation:
Al + H2SO4 → Al2(SO4)3 + H2
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
2H2O + 2Cl2 → 2HCl + O2
Match the columns.
| Reactants | Products | Types of chemical reaction | ||
| 1. | MgH2 | → | Mg + H2 | Endothermic |
| 2. | 2H2S + SO2 | → | 3S + 2H2O | Oxidation |
| 3. | CaO + H2O | → | Ca(OH)2 + heat | Exothermic |
| Redox | ||||
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)
