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What are the constituents of LPG used for cooking?

___ current is used for the electrolysis process.

Which of the following factors are essential for a fire to start -

Largest single use of dihydrogen is in the:

Coal is composed primarily of:

The property of producing sound when beaten is found in:

Ammonia is found in many household products, such as window cleaners. Mixed with water, it turns red litmus blue. What is its nature?

How metal react with acid

What does the symbol 'N' stand for in the periodic table?

Explain the characteristics of synthetic fibres in detail. [3 MARKS]

Major process(es) involved in chromatography is/are:

Amalgam is a ___ mixture.

Represent the following reaction in the form of a chemical equation (balancing not required):

Iron reacts with copper sulphate solution to produce copper and ferrous sulphate.

"C₆H₁₂O₆ + O₂ -----> CO₂ + O₂ + Energy " is it a decomposition reaction???

A type of coal has carbon content of 80% was found to have 5% of sulphur. If the quantity of sulphur in the given variety of coal was 10 grams, then what was the total carbon content in the given type of coal?

5 uses of non metals

Explain why, hot water released by power plants and industries is considered a pollutant.

Which of the following is/are false about diamond?

Why is it advised not to store pickles and curd in metallic utensils? [3 MARKS]

A missile has been fired by the Indian Army with an initial velocity u. If the velocity is tripled, what will be the corresponding change in its kinetic energy?

What is the concentration in terms of mass percent of a solution in which 40 g of salt is dissolved in 200 mL of water?

A mixture of 80ml of ethylene and acetylene when passed through ammonical silver nitrate, the volume of the mixture is reduced to 20ml. The percentage volume of ethylene and acetylene in the mixture is respectively

A peculiar material (A) doesn't burn like wooden sticks but changes colour when heated, and upon prolonged heating and is able to change shape upon hammering. Then (A) can be a ______.

Solubility of a gas in a liquid is directly proportional to the pressure of gas. This is in accordance with

The valencies of aluminium and chlorine in the compound $AlC{l}_3$ are

When a copper object is exposed to moist air for a long time,then a green coating is formed on its surface.

(a) What is the material of the green coating ?

(b) State whether the green coating is acidic or basic.

Name the four main sources of water.

Natural gas in its purest from is

In this Ca SO₄.1/2 (H₂O ) how a molecule of water can be divide into half?

Name the chemical used to make polyester?

Name all the major pollutants of air.

Which of the following is not a fossil fuel?

Which of the following is not a Lewis acid

What is an open drain system? How does it affect human beings?

Which of the following reactions are not feasible?

Choose the elements with their correct symbols.

Which gas in the upper atmosphere prevents ultraviolet radiations of the sun from reaching the earth?

(a) What is meant by 'combustion' ? Explain with an example.

(b) What are the conditions necessary for combustion to take place ?

Sugar charcoal can be obtained by treating sugar$\left(C_{12}{H}_{22}{O}_{11}\right)$ with .

In the diagram given below, structure of atom is depicted, where we are able to see orbits and electrons. How many neutrons and protons are present in the nucleus?

Name the most common fire extinguisher.

1. 3

Can the process of rusting be called combustion ? Give reason for your answer.

Who was the first scientist to define an element?

Which of the following are essential for sustaining human life?

Which of the following statements are correct regarding energy?