English Medium Class 10 - CBSE Question Bank Solutions for Science

What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with eater.

Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?

What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.

Write the equation for the reaction of Magnesium with dilute hydrochloric acid.

Name the products formed. Also indicate the physical states of all the substances involved.

Write the equation for the reaction of Aluminium with dilute hydrochloric acid.

Name the products formed. Also indicate the physical states of all the substances involved.

Write the equation for the reaction of Zinc with dilute hydrochloric acid.

Name the products formed. Also indicate the physical states of all the substances involved.

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.

What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium

Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?

Name one metal more reactive and another less reactive than hydrogen.

Name one metal which displaces copper from copper sulphate solution and one which does not.

Name one metal which displaces silver from silver nitrate solution and one which does not.

Which non-metal has been placed in the reactivity series of metals?

The elements whose oxides can turn phenolphthalein solution pink are:
(a) Na and K
(b) K and C
(c) Na and S
(d) K and P

One of the following is not a neutral oxide. This is:
(a) CO
(b) H₂O
(c) N₂O
(d) Na₂O

A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr

An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H

You are given a solution of AgNO₃. Which of the following do you think cannot displace Ag from AgNO₃solution?
(a) Magnesium
(b) Zinc
(c) Gold
(d) Copper

Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium

The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead