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Which of the following non-metal is used in the figure given below?

What of the following is present in the wastewater?

It is estimated that at the current rates of consumption, the reserves of petroleum may exhaust within ______ years.

Which of the following is a non-metal but is lustrous (a physical property of metals)?

The solution of borax in water is:

Phenolphthalein shows pink colour with which one of the following substances?

Identify P, Q & R in the figure.

Which one of the following is not a man-made fibre?

Arrange the following soil types in the precedence of the size of their particulate matter
Gravel, silt, sand and clay [1 MARK]

Which of the following can be associated with ozone hole?

On heating anhydrous $N{a}_{2}C{O}_3$, ___ is evolved

Water requirement will increase by more than ____ in 2025.

What is rusting

Mahibur takes a bath every day, Pallav washes his clothes every alternate day and Anmol has three leaking taps in his house which constantly drip water. Who among the three is responsible for the wastage of water?

The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be:

Observe the table and identify metals and nonmetals. Select the correct option.
$\begin{array}{ccc}\text{Sl.No.}& \text{Set-1}& \text{Set-2}\\ 1.& \text{Sodium(Na)}& \text{Oxygen(O)}\\ 2.& \text{Magnesium(Mg)}& \text{Chlorine(Cl)}\\ 3.& \text{Iron(Fe)}& \text{Helium(He)}\\ 4.& \text{Gold(Au)}& \text{Sulphur(S)}\\ 5.& \text{Calcium(Ca)}& \text{Carbon(C)}\end{array}$

What type of soil is used by idol makers and why? [2 MARKS]

Which of the following minerals is the hardest?

Metals can be hammered into sheets but solid non-metals break under similar circumstances. Explain why this happens. [3 MARKS]

What is the term used for attraction between molecules of the same substance?

How many electrons are there in a neutral atom of Lithium?

Litmus, a natural dye is an extract of which of the following?

Question 18

How can you observe the three forms of water in (a) nature and (b) at home?

Question 15

Fill in the blanks in the following statements using the words given in the box

(a) Making sugar solution is a …………………. change
(b) A physical change is generally ……………………..
(c) Grinding of wheat grain changes its size. It is a …………….. change.
(d) Iron benches kept in lawns and gardens get ……………… it is a …………….
(e) change because a new ……………… is formed

What are the soil layers called?

Explain how painting ofan iron gate prevent it from rusting

Question 140 (v)

The pieces of Tangrams have been rearranged to make the given shape.

By observing the given shape, answer the following questions.
If we rearrange the same pieces to form some other shape, will be percentage of colours change ?

Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

Which of the following represents properties of glass?