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प्रश्न
What are products? Explain with the help of example.
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उत्तर
- The substances formed as a result of a chemical reaction by the formation of new bonds are called products.
- e.g. Decomposition of calcium carbonate by heating to form calcium oxide and carbon dioxide is a chemical reaction. In this reaction, calcium carbonate is the reactant while calcium oxide and carbon dioxide are the products.
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संबंधित प्रश्न
How will you indicate Exothermic reaction in a chemical equation?
Balance the given equation:
AI(OH)3 
AI2O3 +H2O
Balance the gievn equation:
NaOH + H2SO4 
Na2SO4 + H2O
What is a chemical equation? Explain with the help of an example.
Giving examples, state the difference between balanced and unbalanced chemical equations.
Balance the given chemical equation:
C + CO2 → CO
Write the balanced equations for the following reaction, and add the state symbols:
Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.
Write balanced chemical equation with state symbols for the following reaction:
Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.
Give one example of a chemical reaction characterised by change in state.
Which of the following is not an endothermic reaction?
(a) CaCO3 → CaO + CO2
(b) 2H2O →2H2 + O2
(c) 6CO2 + 6H2O → C6H12O6 + 6O2
(d) C6H12O6 + 6O2 → 6CO2 + 6H2O
One of the following is an exothermic reaction. This is:
(a) electrolysis of water
(b) conversion of limestone into quicklime
(c) process of respiration
(d) process of photosynthesis
When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
(a) What do you think substance X is likely to be?
(b) Name the substance which the yellow solid consists of.
(c) Which characteristic of chemical reaction is illustrated by this example?
(d) Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactant and products involved in the chemical equation.
A colourless lead salt, when heated, produces a yellow residue and brown fumes.
(a) Name the lead salt.
(b) Name the brown fumes.
(c) Write a chemical equation of the reaction involved.
Balance the following chemical equation :
H2 + O2 → H2O
Balance the following equation .
N2 + O2 → NO
Balance the following equation. Also name the product formed.
`"NaNO"_3 → "NaNO"_2 + "O"_2` Name of product (s)
Balance the following equation. Also name the product formed.
`"H"_2 +"CI"_2 → "HCI"`
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)
Write the chemical equation for the following word equation and balance them.
Nitrogen + Oxygen → Nitrogen monoxide
Write the chemical equation for the following word equation and balance them.
Calcium + Nitrogen → Calcium nitride
Balance the following equation:
S + H2SO4 → SO2 + H2O
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Balance the following equation:
HNO3 + H2S → NO2 + H2O + S
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 the volume of chlorine gas formed at S.T.P.
Define: Endothermic reaction
A student mixes sodium sulphate powder in barium chloride powder. What change would the student observe on mixing the two powders? Justify your answer and explain how he can obtain the desired change.
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 – copper carbonate.
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.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
Explain the term ‘chemical equation’.
Balance the following simple equation:
Mg + N2 → Mg3N2
Balance the following simple equation:
Al + N2 → AlN
Balance the following simple equation:
NO + O2 → NO2
Balance the following simple equation:
Mg + CO2 → MgO + C
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.
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
Which of the following statements about the given reaction are correct?
`3"Fe"("s") + 4"H"_2"O"("g") -> "Fe"_3"O"_4("s") + 4"H"_2("g")`
- Iron metal is getting oxidised
- Water is getting reduced
- Water is acting as reducing agent
- Water is acting as oxidising agent
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.
