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Match the entries of column I with column II.

Why there are neutrons in nucleus?

Which cation has smallest radius

How mica and silicon is used in electrical industry?what is manganese where it is used?

1)What do you mean by the term monomers?

2)name the scientist who discovered rayon?

3)write the uses of nylon?

4)write the uses of rayon?

5)write the process of acrylic fibre?

6)differentiate between thermoplastic and thermosetting plastic ?

7)write the disadvantage of plastic ?

Q23. Which of the following processes is Oxidation?

What is the role of limestone in the production of cement?

What are the acids responsible for the formation of acid rain?

Why DO gold do not react like sodium ??I.e is why it is less reative

Give reason for the following:
(a) Air holes of the gas burners have to be adjusted when heated vessels get blackened by the flame.
(b) Use of synthetic detergents causes pollution problems.

In modern matches, why do we need to rub the bulb on the matchbox?

Mahima took some glycerine in her palm, from her mother's dressing table and mixed some water to dilute it. She felt very warm in her palm after some time. What kind of reaction is going on in Mahima's palm? Choose the appropriate one.

Two fishermen live in two different cities 'A' and 'B'. In city 'A' sewage water is treated and then discharged into the rivers. In city 'B' untreated sewage is dumped into the rivers. Who is likely to catch more fishes?

Which non-metal is used in water purification process to make drinking water supply germ-free?

Calorific value is the energy contained in a fuel, determined by measuring the heat produced by the complete combustion of a quantity. Which among the following do you think will have the highest calorific value?

Write the balanced equation for the following reaction:

Sodium hydroxide reacts with calcium bromide to form calcium hydroxide and sodium bromide.

If we are observing the nature of sulphur dioxide with the help of litmus paper. Then what change we will see?

What is acid rain? How is acid rain caused? What are the harmful effects of acid rain?

The methods for prevention of corrosion are:

What is/are the parameter(s) for classifying coals?

The conversion of a substance from the liquid into the gaseous (vapor) phase is called _________

Which of the following pictures represents the arrangement of particles in liquids?

Himanshu wanted to boil water but he had run out of gas. He now has two options - either to use a black colored container or a white colored container to heat water under the sun.

Which of the following is correct?

Which of these is not an effect of Global Warming?

The process of settling of rice in rice and water mixture is called ______ and pouring out the water without disturbing the rice is called _____.

What is / are the suffix used for all oxy-acids?

The colour of the luminous flame is ___ .

Choose the correct option(s) regarding miscible and immiscible liquids.

What is the best method to identify the probable precipitate of a chemical change?

Due to high corrosive nature, alchemists in 8th century called nitric acid as ___________

Which of the following law says that the energy transfer in ecosystem is not 100%?

An unknown metal x when placed in copper sulphate solutions give a red brown precipitate. When placed in magnesium sulphate solutions, give no reaction. Identify element x?

What is the correct formula of aluminium nitrate?

Identify the methods to separate the constituents from a heterogeneous mixture.

Which of the following materials can exhibit the physical property of sonority (being sonorous)?

Match the following.

Relate atomicity elements to their symbols.

$\begin{array}{cccc}& \text{Atomicity}& & \text{Elements}\\ 1.& \text{8}& \text{(a)}& Na\\ 2.& \text{1}& \text{(b)}& B{r}_2\\ 3.& \text{2}& \text{(c)}& S_8\end{array}$

Atomic number is the number of ___ in an atom

Select the correct statements that were proposed by Neils Bohr regarding the model of an atom.

Ammonium chloride on thermal dissociation gives:

Sarthak is observing a reaction between aluminium and sulphuric acid. Before the reaction, he weighed the contents of the flask and it was X g. After the reaction, aluminium sulphide and hydrogen were formed as products. When he weighed the flask after the reaction, it was Y g (which is less than X g). Sarthak declares that the law of conservation of mass is not true. Select the correct option.

Which of the following reacts with cold water vigorously?

if plastics are bad for us and our environment than why plastic is not banned in our country like the other countries?

Discuss the advantages and disadvantages of synthetic fibres.

We have learnt that oxygen is required for something to burn but there is no oxygen in space then how do the stars burn?

When iron fillings are added to a blue coloured copper sulphate solution, what colour change would you observe in solution?