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Is the water that we get for cooking and washing purposes fit for drinking? if not ,how should we treat it?

A liquid can easily change its shape but solids cannot, because?

Question 19

Complete the given table

$\begin{array}{ccc}Formofwater& Processbywhichformed& Locationwherefound\\ \left(a\right)Liquid& & \\ \left(b\right)Solid& & \\ \left(c\right)Gaseous& & \end{array}$

Which of the following is the correct formula of magnesium chloride?

What is an alloy which is a major for preventing rusting of iron?

Which of the following is a natural cause of air pollution?

Differentiate sand and soil on the basis of organic matter content.

The rearing of silkworms to obtain silk is called _____.

What type of matter is sandstone?

Observe the food chain given below:

What would be the effect on food chain if carnivorous disappear?

When I was roaming in Chennai after the Tsunami, I noticed poor sanitation and contaminated drinking water. This could be the main source of _______ in the nearby areas.

We should be careful while handling acids because

Choose the correct sequence of the words that should be used in the below paragraph.

When the popular actor died [A] / had died [B] the Chief Minister himself condoled the family and placed a wreathe [A] / wreath [B] on the body. The sceptic [A] / septic [B] refused to believe that the house was haunted.In a bid to get control of herself after the terrible tragedy her mind sheared [A] / sheered [B] away from all unwelcome or unpleasant images. The power meter [A] / metre [B] appeared to be faulty since consumption was low but bills were high

What is formed when hot copper reacts with oxygen in air?

What is preconsumer recycling process?

You put a camphor tablet out in the air and forget about it. After a few hours, you suddenly remember that you had to put it back into the packet. But now when you check the tablet, you observe that it has become very small in size. How do you think this happened?

Imagine that you and your friends are scientists. To start with you have been given a task that requires you to identify the importance of soil on earth. Identify the correct statement(s) from the following.

Statement 1: Soil is essential for agriculture.
Statement 2: Soil supports the growth of plants.
Statement 3: Soil provides water and nutrients to the plants.

Terracing is an effective method of soil conservation. In which of these areas is it practised?

Which gas increases the earth's temperature?

Which of these is not a type of chemical reaction?

The reaction between an acid and a base to form a salt and water is called ______.

Explain in brief the involvement of energy in - physical & Chemical changes.

Why does Marwari sheep have black hair on head white hair on body

The Philosopher who theorized the existence of atoms.

The chemical formula of quicklime is

If the valency of A is 4 and that of B is 2. What will be the chemical formulae of a compound formed by the combination of A and B?

Which of the following set of wastes can be used to set up compost?

Rearrange the jumbled letter to obtain the name of an indicator.

HCINA ORSE

__

The process of obtaining large crystals of pure salt from sea water is known as ______.

The variable coefficients a, b, c and d are considered for balancing the chemical equation. Relationships between these variable are constructed by balancing the atoms of each element on either side of the reaction. Which of the following are correct?

(Note: coefficients should be natural numbers)

Which of the following metal is the main constituents of haemoglobin?

Classify these changes into physical and chemical changes. [5 MARKS]

Balance this equation (I) Na2O+H2O=NaOH

Question 18

Explain the following:

(a) Lime water turns milky on passing carbon dioxide gas into it.
(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

The component air which comprises more than the $\frac{3}{4}th$ composition of air is

Choose the reactant and complete the equation: ___ $+H_{2}O=2KOH$

Stephan was watching the movie 'Ice age'. He came across some of the characters who are extinct now. Which among the following characters are extinct?

A female silk moth lays approximately how many eggs at a time?

It is called ___ when rain and snow are mixed together and falls on the ground. (Sleet/Dew)

1. Sleet

   
   

Which of these has highest humus content?

Difference between element and compound in column wise?