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प्रश्न
In preparation of Aqua regia hydrochloric acid and _______ acid are mixed.
पर्याय
sulphuric acid
nitric acid
carbonic acid
phosphoric acid
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उत्तर
In preparation of Aqua regia hydrochloric acid and nitric acid acid are mixed.
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संबंधित प्रश्न
Give one example each of which illustrates the following characteristics of a chemical reaction:
evolution of a gas
What do you observe when ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.
How will you obtain Magnesium oxide from magnesium.
Also give balanced equations for the reactions
How will you obtain Silver chloride from silver nitrate.
Also give balanced equations for the reactions
How will you obtain Zinc chloride from zinc.
Also give balanced equations for the reactions
What do you observe when magnesium ribbon is burnt in oxygen?
Write the chemical equation for the event.
A reaction was brought about between ferric oxide and aluminium.
State what is meant by the ‘reactivity series of metals’
Give a balanced equation for the reversible catalytic reaction involving nitrogen as one of the reactants.
Classify the following metals based on their reactivity.
Cu, Zn, Ca, Mg, Fe, Na, Li, Hg
| More reactive | Moderately reactive | Less reactive |
Explain the following reaction with the balanced equation.
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Explain the following reaction with the balanced equation.
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Observe the following diagram and identify the type of reaction and write observation.

A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.
A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.
An element A reacts with water to form a compound B which is used in white washing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.
Explain the following
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- Carbon cannot reduce the oxides of Na or Mg
- NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state
- Iron articles are galvanised.
- Metals like Na, K, Ca and Mg are never found in their free state in nature.
Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.
Metal ‘A’ has electronic configuration 2, 8, 1 and metal ‘B’ has electronic configuration 2, 8, 8, 2. Out of these, which metal is more reactive? Write the reaction of this metal with dilute HCl acid.
