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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?
विकल्प
pH paper
Litmus paper
Standard pH value chart
- Universal indicator
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उत्तर
Litmus paper
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संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
Write the balanced chemical equation for the following reaction.
\[\ce{Zinc + Silver nitrate -> Zinc nitrate + Silver}\]
Translate the following statement into a chemical equation and then balance the equation:
Phosphorus burns in oxygen to give phosphorus pentoxide.
Correct and balance the following equation:
\[\ce{Ca + H2O -> CaOH + H}\]
Balance the following chemical equation:
\[\ce{NH3 -> N2 + H2}\]
Give one example of 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
- oxidising agent, and
- reducing agent,
in this reaction.
Explain the following reaction with one suitable example .
Decomposition reaction
Write your observations and name the product when
Iron nails are added to an aqueous solution of copper sulphate.
Write word equation for the following skeletal equation:
\[\ce{KClO3 -> KCl + O2}\]
Write word equation for the following skeletal equation:
\[\ce{Zn + HCl -> ZnCl2 + H2}\]
Balance the following chemical equation :
Na20 + H20 → NaOH
Write your observation for the following chemical reaction and name the product formed :
When an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate.
Write symbolic representation for the following word equation and balance them :
Calcium carbonate → Calcium oxide + Carbon dioxide.
Balance the following equation Also name the product formed.
`"K" + "CI"_2 → "KCI"`
Write your observation and name the product when zinc reacts with dilute hydrochloric acid.
Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.
Write the chemical equation for the following word equation and balance them.
Sodium reacts with water to form sodium hydroxide and hydrogen
Balance the following equation:
Fe + H2O → Fe3O4 + H2
Balance the following equation:
Pb3O4 → PbO + O2
Balance the following equation:
\[\ce{S + HNO3 -> H2SO4 + NO2 + H2O}\]
Balance the following equation:
Zn + HNO3 `→` Zn(NO3)2 + H2O + NO2
Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate
Write the equation.
Check whether it is balanced, if not balance it.
Find the weights of reactants and products.
State the law which this equation satisfies.
Name the fundamental law that is involved in every equation.
Write the balanced chemical equation of the following reaction.
Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water
Write the balanced chemical equation of the following reaction.
sulphur + nitric acid→ sulphuric acid + nitrogen dioxide + water.
(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?
Match column A with column B.
| Column A | Column B |
| (a) Blue salt changes to white and then black | (i) Ammonium dichromate |
| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
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:
Copper [II] sulphate to sodium hydroxide.
Give reason for the following:
Silver salts are kept in dark coloured bottles.
An element X is trivalent. Write the balanced equation for the combustion of X in oxygen.
Balance the following simple equation:
KHCO3 → K2CO3 + H2O + CO2
Balance the following simple equation:
Fe2O3 + H2 → Fe + H2O
Write a balanced equation for the following word equation:
Potassium bicarbonate → Potassium carbonate + Water + Carbon dioxide
Give a balanced equation by partial equation method, [steps are given below].
The reaction of excess ammonia with chlorine – Ammonia as a reducing agent
- Ammonia first reacts with chlorine to give hydrogen chloride and nitrogen.
- Hydrogen chloride then further reacts with excess ammonia to give ammonium chloride.
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.
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.
NaOH + CO2 → Na2CO3 + H2O
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 | ||||
What is a reactant in a chemical equation?
