Advertisements
Advertisements
प्रश्न
Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:
| Indicator | Colour change | Inference |
| Methyl Orange | No change | ...................... |
| .................... | Acid | |
| Yellow | ....................... |
Advertisements
उत्तर
| Indicator | Colour change | Inference |
| Methyl Orange | No change | Neutral substance |
| Red | Acid | |
| Yellow | Base |
APPEARS IN
संबंधित प्रश्न
How will you indicate Endothermic reaction in a chemical equation?
Balance the given equation:
Mg(OH)2 + HCI MgCI + H2O
Balance the given equation:
AI2(SO4)3 +NaOH
AI(OH)3 + Na2SO4
Fill in the following blank with suitable word:
Chemical equations are balanced to satisfy the law of ............
Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.
Rewrite the following information in the form of a balanced chemical equation:
Magnesium burns in carbon dioxide to form magnesium oxide and carbon.
Substitute formulae for names and balance the following equation:
Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide gas.
Give one example of a chemical reaction characterised by change in state.
State one characteristic of the chemical reaction which takes place when quicklime is treated with water
Is Burning of natural gas an endothermic reaction or an exothermic reaction?
Write your observations and name the product when
Iron nails are added to an aqueous solution of copper sulphate.
Write word equation for the following skeletal equation:
\[\ce{Ca + O2 → CaO}\]
Write word equation for the following skeletal equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Balance the following chemical equation :
H2 + O2 → H2O
Balance the following equation :
Pb3O4 → PbO + O2
Balance the following equation. Also name the product formed.
CO2 + C → CO
Raisins are wiped off gently before final weighing with the help of
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
What is the limitation of the reaction given in question 2?
Write the chemical equation for the following word equation and balance them.
Calcium + Nitrogen → Calcium nitride
Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate
Write the equation.
Check whether it is balanced, if not balance it.
Find the weights of reactants and products.
State the law which this equation satisfies.
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
The chemical reactions in which heat is liberated are called endothermic reactions.
Define: Endothermic reaction
Write word equation for the following molecular equation:
\[\ce{H2 [g] + Cl2 [g] ->[sunlight] 2HCl}\]
Word equation:
State which form of energy is utilised in the above chemical reaction.
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
NH3 + HCl ⇌ NH4Cl
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
2H2 + O2 → 2H2O
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Heat energy
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
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.
Name the following:
Two gases which react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2SO3}\]
Balance the following simple equation:
Al + O2 → Al2O3
Balance the following simple equation:
H2 + O2 → H2O
Write a balanced equation for the following word equation:
Potassium nitrate → Potassium nitrite + Oxygen
Write a balanced equation for the following word equation:
Nitrogen dioxide + Water + Oxygen → Nitric acid
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Na2SO3 + HCl → 2NaCl + H2O + SO2
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)

Which of the following is the correct observation of the reaction shown in the above set up?
