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प्रश्न
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 | ||||
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उत्तर
| Reactants | Products | Types of chemical reaction | ||
| 1. | MgH2 | → | Mg + H2 | Oxidation |
| 2. | 2H2S + SO2 | → | 3S + 2H2O | Redox |
| 3. | CaO + H2O | → | Ca(OH)2 + heat | Exothermic |
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संबंधित प्रश्न
Write a complete balanced equation for the following reaction:
\[\ce{Sulphur dioxide (gas) + Oxygen (gas) -> Sulphur trioxide (gas)}\]
Balance the following equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to the potassium permanganate solution.
State one characteristic of the chemical reaction which takes place when dilute sulphuric acid is added to barium chloride solution.
Which of the following are endothermic reactions and which are exothermic reactions?
- Burning of natural gas
- Photosynthesis
- Electrolysis of water
- Respiration
- Decomposition of calcium carbonate
What is a chemical equation?
Write word equation for the following skeletal equation:
\[\ce{Ca + O2 → CaO}\]
Balance the following chemical equation :
H2 + O2 → H2O
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 ron nails are added to an aqueous solution of copper sulphate.
Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.
Balance the equation stepwise.
H2S2O7(l) + H2O(l) → H2SO4(l)
What is a chemical equation? Why it is necessary to balance it?
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
Fe2O3 + CO → Fe + CO2
Balance the following equation:
S + H2SO4 → SO2 + H2O
Write the balanced chemical equations of the following reactions.
chlorine + sulphur dioxide + water → sulphuric acid + hydrogen chloride
Write the balanced chemical equation of the following reaction.
ammonia + oxygen → nitric oxide + water
How is a flame test performed?
Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
What is the colour of this precipitate? Name the compound precipitated.
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
Write the balanced chemical equation for this reaction.
Write word equation for the following molecular equation:
FeSO4 + 2NaOH →Na2SO4 + Fe(OH)2 ↓
Word equation:
State why [↓] indication is seen after Fe(OH)2 and not after Na2SO4
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 – lead [IV] oxide.
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 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
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Balance the following simple equation:
N2 + O2 ⇌ NO
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
Balance the following simple equation:
H2 + Cl2 → HCl
Balance the following simple equation:
Ca + H2O → Ca(OH)2 + H2
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information provided by the above chemical equation.
Write a balanced equation for the following word equation:
Potassium bicarbonate → Potassium carbonate + Water + Carbon dioxide
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
CaC2 + N2 → 2CaCN2 + C
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
PbO2 +4HCl → PbCl2 + H2O + Cl2
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.
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
Complete the following blank in the equation as indicated.
\[\ce{CaH2_{(s)} + 2H2O_{( aq)}-> Ca(OH)2_{(s)} + 2H2_{(g)}}\]
Grams: 42 g + ______ `→` ______ + ______
