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Mahima took two different test tubes and put zinc granules in one and in the other put zinc powder. She poured dilute sulphuric acid with the help of a glass rod in both the test tubes. Which of the test tubes would exhaust first?

Choose the correct statement(s).

Which of the following metals can be cut with a knife?

What is the catalyst used in the production of H₂SO₄ acid?

Why Iron (|||) chloride is acidic while sodium carbonate is basic. Explain

Which city has taken several initiatives for harvesting rainwater to increase the level of groundwater?

Inflammable substances have

A poisonous gas that has a strong smell of rotten eggs is :-

Give an example of a chemical reaction which is characterised by the formation of a precipitate.

Metal which occur in the native state is ___ .

Choose the correct alternative :

(a) Anthracite is

(i) an inferior type of coal

(ii) a superior type of coal

(iii) the cheapest form of coal

(iv) none of the above

(b) Destructive distillation of coal yields

(i) coal tar

(ii) coal gas

(iii) coke

(iv) all of the above

(c) Lamp black is

(i) an amorphous form of carbon

(ii) a crystalline form of carbon

(iii) a pure form of carbon

(iv) a cluster of carbon atoms

(d) The process by which decayed plants slowly convert into coal is called

(i) petrification

(ii) carbonisation

(iii) carbonification

(iv) fermentation

(e) The purest form of the amorphous carbon is

(i) wood charcoal

(ii) sugar charcoal

(iii) bone charcoal

(iv) lamp black

Potential energy depends on:

The ionic compound containing ${Fe}^{3+}$ and $(S{O}_4{)}^{2-}$ would have the formula

What is the valency range of metals?

The reaction of sodium hydroxide with hydrochloric acid results in

How many types of plastic are there? Write about them.

Which of the following articles made of plastics 'can be recycled' and which 'cannot be recycled' ? Give reasons for your choice.

Telephone instruments, Plastic toys, Cooker handles , Plastic covering on electrical wires, Electric switches, Ballpoint pens, Carry bags, Plastic bottles, Plastic chairs

(a) What are petrochemicals ? Name any two petrochemicals.

(b) Why are petrochemicals so important ?

Which of the following pairs cannot undergo displacement reaction?

(a) iron sulphate solution and magnesium

(b) zinc sulphate solution and iron

(c) zinc sulphate solution and calcium

(d) silver nitrate solution and copper

Study the characteristics of substance X given below:

Based on the above characteristics, what could X be?

What is the amount of work to be done on a car of mass $\text{1000kg}$ to increase its velocity from $\text{10km/hr}$ to $\text{20km/hr}$?

Explain the reaction between Zinc and sulphuric acid. [3 MARKS]

A metal on reaction with an acid liberates a gas which gives a pop sound when brought in contact with a flame. Identify the gas.

Which of the following elements will produce an oxide that will dissolve in water to form an acid ?

(a) carbon

(b) calcium

(c) chromium

(d) copper

What is the use of a diamond?

Name the scientist who first measured the e/m ratio of an electron.

The pollutants released from air conditioners and refrigerators are ___ .

Why does the increased level of nutrients into the water affect the survival of aquatic organisms?

Some reasons are given regarding the limited use of H₂ as a fuel.
I) Its calorific value is low.
II) Its availability in a free state is less.
III) It is difficult to store.
IV) It is not a clean fuel.

Which of the following statements are correct?

Difference between heat and Temperature

The atomicity of FeCO₃ is ___.

What happens to the solubility of most of the solids due to a rise in the temperature?

$Mass\%$ of oxygen in Glucose is _____

Why did the discovery of neutrons came very late?

Sodium catches fire when it comes in contact with water because:

The chemical reaction in which heat and light are produced is called___.

A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, Find the work done by the man.$(takeg=10m{s}^{-2})$

1. 16

The heat energy obtained on burning 2 kg of hydrogen, coal, and petrol are given below:

Hydrogen- $3\times {10}^8$ J

Coal- $6\times {10}^7$ J

Petrol- $9\times {10}^7$ J

Arrange these fuels in the ascending order of their calorific values.

What is the nature (acidic /basic) of the following oxides ?

(a) Magnesium oxide (b) Sulphur dioxide

Give reason for your choice.

Water cannot be used to extinguish ___ .

Which metallic hydroxide is pink in colour and is used as an antacid?

Select the combustible substance:

Give two examples for each of the following :

(a) The substances which sublime.

(b) The substances which do not change their state on heating.

Write down the various exceptions in physical properties of non metals. [3 MARKS]

Name the term which is used to express the efficiency of a fuel.