Advertisements
Advertisements
Question
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.
Advertisements
Solution
(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.
APPEARS IN
RELATED QUESTIONS
Name the following:
Metals which forms an amphoteric oxide.
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Name the metal which has been placed at the bottom of the reactivity series.
Name the metal which has been placed at the top of the reactivity series.
Complete and balance the following equation:
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
Can we keep sodium immersed under water? Why?
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
Write the equation for the reaction of Iron with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
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
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?
CuSO4(aq) + Fe(s) → FeSO4(aq) + Cu(s)
FeSO4(aq) + Zn(s) → ZnSO4(aq) + Fe(s)
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
Name a metal which does not react with cold as well as hot water but reacts with steam.
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.
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Write the name and formula of a molecule made up of three atoms of oxygen.
The substance that will be flattened on beating with a hammer is ______.
