English Medium कक्षा १० - CBSE Question Bank Solutions

A metal less reactive and another metal more reactive than hydrogen are ______.

An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be ______.

Which one of the following four metals would be displaced from the solution of its salt by the other three metals?

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be ______.

State whether the following statement is true or false:

Diamond and graphite are the covalent compounds of carbon element (C).

Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

An element E forms an oxide E₂O. An aqueous solution of E₂O turns red litmus paper blue.

1. What is the nature of the oxide E₂O?
2. State whether element E is a metal or a non-metal.
3. Give one example of an element like E.

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.

1. What is the nature of oxide A₂O₃?
2. What is the nature of oxide BO?
3. Name one metal like A.
4. 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.

1. What is the nature of oxide XO?
2. What is the nature of oxide ХО₂?
3. Would you call element X a metal or a non-metal? Give reason for your choice.
4. Can you give an example of element like X?

State and explain the reaction of the following metal with a solution of copper sulphate:

Gold

Buckminsterfullerene is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.

1. How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene?
2. How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene?

Buckminsterfullerene is spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.
How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene?

In a solution of lead acetate, a strip of metal M was dipped. After some time, lead from the solution was deposited on the metal strip. Which metal is more reactive, M or lead?

\[\ce{CuSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Cu_{(s)}}\]

\[\ce{FeSO4_{(aq)} + Zn_{(s)} -> ZnSO4_{(aq)} + Fe_{(s)}}\]

On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.

Which of the following reactions will not occur? Why not?

1. \[\ce{MgSO4_{(aq)} + Cu_{(s)} -> CuSO4_{(aq)} + Mg_{(s)}}\]
2. \[\ce{CuSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Cu_{(s)}}\]
3. \[\ce{MgSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Mg_{(s)}}\]

In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?