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When Garima came to know about 22$nd$ March, she became curious and started to research on the origin of water on the Earth. Which of the following is a probable hypothesis?

How can air pollution be reduced?

Following figure shows ___

___ gas is evolved upon combustion of an organic substance along with water vapour.

Bronze is an alloy which contains

When we apply baking soda solution on an ant or bee sting, it gets cured. But, soap solution is also a base and if we apply to it why does the sting doesn't get cured?

A mixture of iron filings and dust can be separated by

Nitrogen is an important component of

Look at the table given below:

$\begin{array}{ccc}Properties& Acid& Base\\ RedLitmus& \left(i\right)\text{\_\_\_\_\_}& Turnstoblue\\ Taste& Sour& \left(ii\right)\text{\_\_\_\_\_}\\ Extractofredcabbage& \left(iii\right)\text{\_\_\_\_\_}& Turnstogreenishcolor\end{array}$

Select the correct statement(s) from the following.

1. 1.5

When non-metallic oxides are dissolved in water ___________ are formed

The density of water is approximately ___ .

Question 2

Seas and oceans are full of water on earth. However, a very small percentage of water present on earth is available for us. This percentage is roughly
(a) 0.006%
(b) 0.06%
(c) 0.6%
(d) 6%

${ZnCO}_3$ + HCl $\to$ ${ZnCl}_2$ + Y + X;

What is X and Y respectively?

Which of the following are true according to Dalton’s Atomic Theory?

(i) Atoms can neither be created nor destroyed in a chemical reaction.

(ii) Atoms of different elements have different masses and chemical properties.

(iii) Atoms can be broken down into smaller parts like Protons,Electons And Neutons .

(iv) Atoms of an element have variable chemical properties depending on the Chemical reactions

(v) The relative number and kinds of atoms vary in a given compound.

(vi) Atoms combine in the ratio of small whole numbers to form Compounds.

Which principle is behind the working of fire extinguisher?

Define physical change. [1 MARK]

Appu’s father collected four different types of soil from different places. He took four different beakers with funnel and filter paper. Then he put 10g of each sample of soil on the filter paper placed on the top of each beaker. Then he poured 70 ml of water in each beaker passing the filter paper with soil. After some time he observed that the amount of water in beaker A is 25 ml, beaker B is 30 ml, beaker C is 65 ml and beaker D is 50 ml. Based on this observation of Appu's father, which soil you think he should pick for his farm?

Match the following according to the correct set of the pairs:

i. Wheat a. Loamy soils

ii. Paddy b. Sandy-loamy soils

iii. Lentils c. Clayey and loamy soils

iv. Cotton d. Clayey soil with lots of humus

The total water present on earth is called as 'hydrosphere'. It includes:

Which of the following pair is not the source of fresh water?

Which of the following factors are essential to ignite a fire?

___is used as a catalyst in the formation of Ammonia from Nitrogen and Hydrogen.

Global Warming is caused by which type of gases?

A bushy plant with wooden stem and many branches is a ____.

___is the small, hard balls of ice which falls on the ground just like rain.

When do we make use of Roman numerals to indicate the charge of the cation?

Compound X in crystal form, taken in a dry test tube is heated to give ferric oxide and two sulphur based gases. The compound X is:

The process of selecting parent animals for obtaining desired characteristics in offsprings such as long hair, soft under hair etc. is called ______________________.

When cold water is kept in a glass, small droplets are formed on the surface of the glass after a while. How does this happen? What is this phenomenon called? Can the reverse of this phenomenon happen? If so, what is that process called? Explain with an example. [5 MARKS]

Give three reasons for dispersal of seeds in plants. [3 MARKS]

What is transpiration? How does it occur and how is it helpful for the plants? [3 MARKS]

Appu noticed that the sheared wool was dirty and had the grime and dust collected by the sheep. He said that it needed to be washed in the laundry. The farmer chuckled again and said there is a special process to wash the fleece. This process is called ___________________________.

What is the composition of washing soda?

Which of these is a polyatomic molecule?

In bullock carts, the iron rim is usually heated before fixing it to the wooden wheels. This is because after heating iron ___

Silver articles become black on prolonged exposure to air. This is due to the formation of

The release of which gas in the atmosphere creates Green house Effect?

Question 6 (i)
Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Nitric acid turn red litmus blue.

In which of the following method, two half equations are balanced separately and then added together to give balanced equation?

Which of the following is an example of displacement reaction?