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प्रश्न
Choose the correct alternative and rewrite the following sentence.
Which of the following is not required to find the pH of a given solution?
पर्याय
pH paper
Litmus paper
Standard pH value chart
- Universal indicator
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उत्तर
Litmus paper
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संबंधित प्रश्न
How will you indicate Endothermic reaction in a chemical equation?
Balance the given equation:
AI(OH)3 
AI2O3 +H2O
Balance the given equation:
AI2(SO4)3 +NaOH 
AI(OH)3 + Na2SO4
Balance the given chemical equation:
NH3 → N2 + H2
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 products.
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.
Give one example of a chemical reaction characterised by change in state.
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 exothermic reaction.
Is Electrolysis of water an endothermic reaction or an exothermic reaction?
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
The removal of oxygen from a substance is called:
(a) oxidation
(b) corrosion
(c) reduction
(d) rancidity
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Why do we need to balance chemical equations?
Balance the following chemical equation :
H2 + O2 → H2O
Write your observation for the following chemical reaction and name the product formed:
When sugar is heated.
Balance the following equation. Also name the products formed.
\[\ce{Ag + S -> Ag2S}\]
Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:
Complete the following equation:
CH2 + H5OH `("Hot Conc." H_2SO_4)/`>
The step(s) necessary for determining the percentage of water absorbed by raisins is/are:
Explain the terms with examples.
Balanced equation
Balance the following equation:
Zn + HNO3 `→` Zn(NO3)2 + H2O + NO2
Choose the correct answer from the options given below.
The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.
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.
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.
2H2 + O2 → 2H2O
Give word equation for the following chemical reaction and give the names of the product formed.
\[\ce{CuO + H2SO4 -> CuSO4 + H2O}\]
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
Write a balanced equation for the following word equation:
Potassium nitrate → Potassium nitrite + Oxygen
Give a balanced equation by the partial equation method, [steps are given below].
Oxidation of Lead [II] Sulphide by Ozone
- Ozone first decomposes to give molecular oxygen & nascent oxygen.
- Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate.
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
What is called thermolysis reactions?
What is a product in a chemical equation?
When aqueous solutions of potassium iodide and lead nitrate are mixed an insoluble substance separates out. The chemical equation for the reaction involved is:
A student took a small amount of copper oxide in a conical flask and added dilute hydrochloric acid to it with constant stirring. He observed a change in colour of the solution.
- Write the name of the compound formed and its colour.
- Write a balanced chemical equation for the reaction involved.
