Advertisements
Advertisements
प्रश्न
The chemical reactions in which heat is liberated are called endothermic reactions.
विकल्प
True
False
Advertisements
उत्तर
The chemical reactions in which heat is liberated are called endothermic reactions. - False
APPEARS IN
संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{BaCl2 + H2SO4 -> BaSO4 + HCl}\]
What does the symbol (aq) represent in a chemical equation?
How will you indicate the following effect in a chemical equation?
A solution made in water.
Chemical equations are balanced to satisfy the law of ______.
A solution made in water is known as an ______ solution and indicated by the symbol ______.
An acid which can decolourise purple coloured potassium permanganate solution is ______.
When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
- What do you think substance X is likely to be?
- Name the substance which the yellow solid consists of.
- Which characteristic of chemical reactions is illustrated by this example?
- Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
- What is metal M?
- What is solution S? Is it acidic or alkaline?
- What is gas G?
- Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
- Is this reaction exothermic or endothermic?
Balance the following chemical equation:
\[\ce{Pb(NO3)2_{(s)} ->[Heat] PbO_{(s)} + NO2_{(g)} + O2_{(g)}}\]
Balance the following chemical equation :
H2 + O2 → H2O
Write your observation for the following chemical reaction and name the product formed :
When ammonium chloride is heated with sodium hydroxide.
Balance the following equation :
Fe + O2 → Fe3 O4
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
Complete the following equation:
CH3COOH + NaOH →
In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?
Write the chemical equation for the following word equation and balance them.
Calcium oxide + Carbon dioxide → Calcium carbonate
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
PbS + O2 → PbO + SO2
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Balance the following equation:
Zn + HNO3 `→` Zn(NO3)2 + H2O + NO2
Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.
Write the balanced chemical equation of the following reaction.
aluminium carbide + water → aluminium hydroxide + methane
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Zinc reacts with silver nitrate to produce zinc nitrate and silver.
What is thermit process?
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
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Heat energy
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
NaCl + AgNo3 → AgCU ↓ + NaN03
Explain the term ‘chemical equation’.
Balance the following simple equation:
Fe + Cl2 → FeCl3
Balance the following simple equation:
H2S + Cl2 → S + HCl
Balance the following simple equation:
\[\ce{Ca(OH)2 + HNO3 -> Ca(NO3)2 + H2O}\]
Write a balanced equation for the following word equation:
Lead dioxide [lead (IV) oxide] → Lead monoxide + Oxygen
With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation.
B: Limitations of a chemical equation.
- The nature of the individual elements.
- The speed of the reaction.
- The state of matter in which the substance is present.
- The completion of the reaction.
- The direction of the reaction.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
2H2O + 2Cl2 → 2HCl + O2
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
