Explore topic-wise InterviewSolutions in .

Which of the following reaction is an example of a displacement reaction involving non-metals?

Which of the following is not a Lewis acid

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

(a) Zinc

(b) silver

(c) copper

(d) magnesium

Intermixing of particles of two different types of matter is called as:

How do carelessly thrown plastic bags (polythene bags) affect :

(a) dirty water drains and sewers ?

(b) animals (such as cows) ?

State the various uses of natural gas.

Why is cigarette-smoking harmful ?

Which of the following materials did people use in ancient times for making clothes?

(1) Newspaper
(2) Leaves of trees
(3) Metal Foils
(4) Animal skins and furs

The correct order of ionic size of the species $K^{+},C{l}^{-},C{a}^{2+}$ and $S^{2-}$ is:

What is eutrophication? What are it's side effects?

${\text{MnO}}_2\text{(s)}+4\text{HCl(aq)}\to {\text{MnCl}}_2\text{(aq)}+{\text{Cl}}_2\text{(g)}+2{\text{H}}_2\text{O(l)}$

Identify the oxidising and reducing agents in the above reaction. Give an example of a decomposition reaction. [3 MARKS]

When I am increasing pressure the boiling point is increasing ,then when I am changing gas into liquid or liquid into solid under high pressure in low temperatures,what is the factor increasing or decreasing to turn it into a liquid or gas?

Symbol of caustic soda and caustic potash and potassium

What is periodic table

Find the ratio by mass of the combining elements in the compound - $C_2{H}_{5}OH$.

In the solid form, non-metals are:

Question 25
Indicate whether the following statements are true or false. Also write the false statements in their correct form.

Which of the following statement is true for matter?

1. 3

Choose the correct statement(s).

You are given a mixture of iodine in alcohol called tincture of iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture, if the difference between the boiling points of iodine and alcohol is more than $25{}^{\circ }C$?

Which of the following is a weak electrolyte ?
(a) carbonic acid
(b) sodium hydroxide
(c) copper sulphate
(d) nitric acid

Which among the following states of matter is not a fluid?

Choose the substance that will not undergo sublimation.

(a) Make a labelled diagram of a candle flame:

(b) What makes the middle zone of a candle flame luminous (or light-giving) ?

Name the process in which a part of the glass is reacted with hydrogen fluoride or hydrofluoric acid to make decorative glass articles.

Write reactions for a metal undergoing:
(i) Reaction with Oxygen
(ii) Reaction with Water
(iii) Reaction with Acids
(iv) Displacement Reactions
Explain the concept behind the displacement reactions.​ [5 MARKS]

As we all know the earth's gravitational force attract all the objects towards it at the speed of 9.8m/s. But if we fall from a great height, let consider that we jump from an aeroplane. As we jump our speed is low but as we get closer to the earth's surface our speed starts increasing. Why this happen?

Sometimes, when a person is caught with fire, a thick blanket is wrapped around him or her. This is done to

Which of the following can be used as an acid-base indicator in the laboratory?

What is the definition of metals?

Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires ?

(a) it is heavier than air

(b) it is lighter than air

(c) it is not combustible

(d) it does not support combustion

How does boiling point increase with increase in pressure in a pressure cooker?

Identify the popular water purification technique that is used for purification of drinking water in cities.

Why oxygen is not combustible?

Give the tips advised by PCRA to save petrol/diesel while driving. [3 MARKS]

Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the correct composition of Aqua-regia from the given options?

In rutherford's experiment, when alpha particles were sent through a thin metal foil, only one out of ten thousand rebounded. This observation led to the conclusion that:

In the following question, there is a sentence which is divided into four parts. Choose the fragment that carries an error (if any). Ignore punctuation errors if any.

Hardly had he arrived / when the house / caught fire / and everything was reduced to ashes.