English Medium इयत्ता १० - CBSE Question Bank Solutions for Science

The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur

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

Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide

A metal less reactive and another metal more reactive than hydrogen are:
(a) aluminium and lead
(b) iron and magnesium
(c) copper and tin
(d) copper and mercury

An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag

Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg

An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na

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 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.

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?

State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury

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?

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.

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

(a) MgSO₄ (aq) + Cu (s) → CuSO₄ (aq) + Mg (s)

(b) CuSO₄ (aq) + Fe (s) → FeSO₄ (aq) + Cu (s)

(c) 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?

If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?

Name a metal which does not react with cold as well as hot water but reacts with steam.

Name a metal which It does not react with any physical state of water?

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?