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Arrange the following in order of their increasing atomic number:

Si, Ne, Mg, S, C

(a) What are synthetic fibres ? Name any two synthetic fibres.

(b) Why have synthetic fibres become more popular than natural fibres ?

The formula for concentration of solution in terms of volume by volume percentage is:

Which of the following is the main source of carbon monoxide (CO)?

Chemical formula of rust.

If you put one end of metal in the hot solution you can feel the heat at the other end. What does that mean? What is this property of metals?

What can be inferred from the following equation?

$N{a}_{2}S{O}_4\left(aq\right)+BaC{l}_2\left(aq\right)\to BaS{O}_4\left(s\right)+2NaCl\left(aq\right)$

(i) It is a double displacement reaction.

(ii) It is a precipitation reaction.

(iii) It is a decomposition reaction.

(iv) $BaS{O}_4$ is soluble in water

(v) $BaS{O}_4$ is precipitate.

(vi) Aqueous solution of sodium chloride is formed.

Which of these water sources do not contain saltwater?

Explain ionisation energy and valency

State three ways by which carbon dioxide gas is added into the atmosphere.

What are the main causes of water pollution ? How can it be controlled ?

What do we call the substance which either slows down or stops the reaction from proceeding further?

The small repeating unit of polymer is known as:

Metals generally react with oxygen to form:

We need to balance chemical reactions because:

An element burns in air to form an oxide.The aqueous solution of this oxide turns turmeric paper red. State whether the element is a metal or non-metal.Name one such element.

What are the features of the nuclear model of an atom as proposed by Rutherford?

Very Short define of organic or inorganic.

____ bags are used as an alternative to plastic bags.

Why is acrylic used to make sweaters and blankets ?

Decomposition of $H_2$$O_2$ is a

If a person suffers from low level of oxygen in blood, the doctor mentions this medical condition as ___________

How are holy rivers getting polluted ??

Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. Vijay is able to pull the block total distance 6.5 m. Find the net work done.

What is meant by mental reactivity series ? State its importance, (any two points).

Rayon is prepared by

If two soap bubbles of different radii are connected by a tube,

Which of the following is a pure substance?

Mention one example each for the different types of chemical reactions.

Given below is the table containing the properties of Metals. Identify X and Y in the table.

If an atom has four electrons in its valence shell, what type of ions will it form?

How to easily balance equations?

Why is CNG considered as better fuel than petrol and diesel?

We use aluminium foils for wrapping food. This shows that aluminium is:

Srivani tested the solubility of potassium chloride in water at different temperatures and collected the data as given below.
$$\begin{array}{cccccc}\text{Temperature (degree celsius)}& \text{20}& \text{30}& \text{40}& \text{50}& \text{60}\\ \text{Solubility (g per 100 ml)}& \text{34.2}& \text{37.2}& \text{40.1}& \text{42.6}& \text{45.8}\end{array}$$

What amount of salt is reqired to make a saturated solution with 200 mL of water at ${40}^{\circ }C$ ?

An electric spark is struck between two electrodes placed near each other in a closed tank full of Will the petrol catch fire ? Explain your answer.

Fibres of _______ resemble that of silk and hence, it is popularly known as 'artificial silk'.

When added to cold water, which metal produces lots of bubbles rapidly?

Explain the formation of scum when hard water is treated with soap. [3 MARKS]

Which of the following is not a quality of an ideal source of energy?

Why synthetic fibres are more popular than natural fibres? [3 MARKS]

Which of the following are the uses of oxygen?