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प्रश्न
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
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उत्तर
(a) The oxide E2O is basic in nature because it turns red litmus paper blue.
(b) The element E is a metal because metal oxides are basic in nature.
(c) Sodium (Na) is an element like E. It forms the oxide Na2O on reacting with oxygen, which turns red litmus paper blue.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Show the formation of Na2O by the transfer of electrons.
From amongst the metals sodium, calcium aluminium, copper and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
Complete and balance the following equation:
Na2O + H2O →
With the help of examples, describe how metal oxides differ from non-metal oxides.
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place
A copper plate was dipped in AgNO3 solution. After certain time, silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
Can we keep sodium immersed under water? Why?
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Name another metal oxide which behaves like aluminium oxide.
Which non-metal has been placed in the reactivity series of metals?
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
(a) MgSO4 + Fe
(b) ZnSO4 + Fe
(c) MgSO4 + Pb
(d) CuSO4 + Fe
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
An element X forms two oxides XO and XO2. The oxide XO has no action on litmus solution but oxide XO2 turns litmus solution red.
(a) What is the nature of oxide XO?
(b) What is the nature of oxide XO2?
(c) Would you call element X a metal or a non-metal? Give reason for your choice.
(d) Can you give an example of element like X?
A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.
Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
