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प्रश्न
The chemical reactions in which heat is liberated are called endothermic reactions.
विकल्प
True
False
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उत्तर
The chemical reactions in which heat is liberated are called endothermic reactions. - False
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride}\]
Write the balanced chemical equation for the following reaction.
\[\ce{Aluminium + Copper chloride -> Aluminium chloride + Copper}\]
Giving examples, state the difference between balanced and unbalanced chemical equations.
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are reactants.
Convey the following information in the form of a balanced chemical equation:
"An aqueous solution of ferrous sulphate reacts with an aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in solution."
Substitute formulae for names and balance the following equation:
Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide gas.
When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.
What do you understand by exothermic reactions?
Is Burning of natural gas an endothermic reaction or an exothermic reaction?
Is Respiration an endothermic reaction or an exothermic reaction?
Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reaction. Name (i) oxidising agent, (ii) reducing agent, in this reaction.
Balance the following chemical equation :
FeS + HCl → FeCl2 + H2S
Write your observation for the following chemical reaction and name the product formed :
When dilute acetic acid is poured on baking soda.
Write symbolic representation for the following word equation and balance them :
Calcium oxide + Water → Calcium hydroxide
Balance the following equation. Also name the product formed.
N2 + H2 → NH3
Balance the equation stepwise.
SO2(g) + H2S(aq) → S(s) + H2O(l)
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Balance the following equation:
P + HNO3 → NO2 + H2O + H3PO4
Why should an equation be balanced? Explain with the help of a simple equation.
Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate mass of MnO2 used.
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.
\[\ce{C +2S -> CS2}\]
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Lead nitrate to ammonium hydroxide.?
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Is the equation given above a balanced equation. Give reasons.
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + S → ZnS
Give word equation for the following chemical reaction and give the names of the product formed.
NH3 + HCl→ NH4Cl
Name the following:
The gas evolved when a dilute acid is added to chalk [limestone].
Name the following:
Two non-metal which react explosively when brought in close contact.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{Na2SO3 + 2HCl ->[\triangle] 2NaCl + H2O + SO2}\]
Balance the following simple equation:
Zn + HCl → ZnCl2 + H2
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
What are reactants? Explain with the help of example.
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Make a list of the elements in the chemical equation.
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
- In beakers A and B, endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
What is a product in a chemical equation?
