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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
What is a balanced chemical equation? Why should a chemical equation be balanced?
Balance the chemical equation.
\[\ce{HNO3 +Ca(OH)2 -> Ca(NO3)2 + H2O}\]
Balance the following chemical equation.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Balance the following chemical equation:
\[\ce{C + CO2 -> CO}\]
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.”
State one characteristic of the chemical reaction which takes place when dilute sulphuric acid is added to barium chloride solution.
Give one example of an endothermic reaction.
You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.
Name the various types of chemical reactions.
Balance the following chemical equation :
Na20 + H20 → NaOH
Write symbolic representation for the following word equation and balance them :
Carbon + Oxygen → Carbon dioxide.
Balance the following equation. Also name the product formed.
`"Zn" + "HCI" → "ZnCI" _2 + "H"_2`
Balance the equation stepwise.
NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Balance the following equation:
Pb3O4 → PbO + O2
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Balance the following equation:
H2O + Cl2 → HCl + O2
What information do the following chemical equations convey? Mg + 2HCl → MgCl2+ H2
Write the balanced chemical equations of the following reactions.
chlorine + sulphur dioxide + water → sulphuric acid + hydrogen chloride
(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?
Choose the correct alternative and rewrite the following sentence.
Which of the following is not required to find the pH of a given solution?
Write word equation for the following molecular equation:
\[\ce{NH3 [g] + HCl [g] ⇌ NH4Cl [s]}\]
Word equation:
State which characteristic is observed in the above reaction.
Give an-example of a similar above characteristic, seen between two other gaseous reactants.
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.
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
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Name the following:
A catalyst which increases the rate of a chemical reaction.
What is meant by ‘reactants’ and ‘products’ in a chemical equation?
Balance the following simple equation:
Ca + H2O → Ca(OH)2 + H2
Balance the following simple equation:
H2 + O2 → H2O
Balance the following simple equation:
NaOH + Cl2 → NaCl + NaClO + H2O
Write a balanced equation for the following word equation:
Aluminium + Oxygen → Aluminium oxide
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
A dilute ferrous sulphate solution is gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
Which of the following is the correct observation of the reaction shown in the above set up?
