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Statement: Nitrogen and hydrogen combine together to form ammonia and heat

Conclusion: It is a combination and an exothermic reaction.

Which of the following sets contains only thermoplastics?

If we rub a comb in dry hair, it attracts small pieces of paper. Which of the following statements can be related to this?

Fill in the following blanks with suitable words :

(a) Fossil fuels are ___ , ___ and ___ .

(b) Coal contains mainly ___ .

(c) The slow process of conversion of dead vegetation into coal is callled ___ .

(d) The process of separation of different constituents from petroleum is called ___ .

(e) The least polluting fuel for vehicles is ___ .

(f) The burning of fossil fuels causes air ___ and also leads to global ___ .

What is the value of 1 atomic mass unit in terms of grams?

During phase change from solid to liquid and liquid to gas the interparticle distance ______.

Which of the following is not true for an ideal fuel:

Sir / ma'am

In the topic of electronic configuration of some element we have to write the no. of neutrons and no. of protron.

So, there is some method to learn this or just mug up???

Mahima was looking at one of the samples kept in a type of coal display. One of the samples intrigued her very much. It looked "brownish-black organic material and almost looked like decayed wood". Could you help her identify the sample?

Give some examples of matter

Define :

(a) Diffusion.

(b) Brownian motion.

What is the last but one step in the production of sulphuric acid?

What is the charge on Mg in $Mg{Cl}_2$ ?

In the previous video, there was a peculiar material which was not burning along with the wooden sticks but was changing color, melting on prolonged heating and was able to change shape upon beating. What can be that material probably be?

A solution contains 20 g of sugar dissolved in 180 g of water. The concentration of this solution will be ​_____.

Write 4 ways to conserve water

Energy needed in breaking a drop of radius R into n drops of radii r is given by

What method of separation can be used to separate powdered sugar and salt?

Which of the following causes air pollution?

When reaction is extremely rapid, the combustion is known as

One of the strongest metals Caesium cannot be used under normal circumstances. Why?

Raghav performed an experiment in which he combined 0.5 g of ammonia with 1.1 g of HCl to produce ammonium chloride. Again, he reacted the ammonium chloride produced with 5.2 g of silver nitrate and formed X g of ammonium nitrate and 4 g of silver chloride precipitates out. Find the value of X.

The dry cell is used in

Fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, is called ___ fuel.

If sulphur content is high what is the grading for coal?

What is the purpose of neutralising soil before any farmer grows crop?

Why is sun burning if it do not have oxygen and how it shines

What happens to a substance after entering the Black hole?are there any assumptions.

Which of the following is TRUE about metals?

Which of the following is not a nitro-derivative

[DCE 2004]

The most common bucky ball cluster is:-

The material which can give or take electrons are known as metals but non metals can also give or take electrons so what's the matter

Is water a fuel ?

A high-level committee headed by the former cabinet secretary TSR Subramanian has been constituted to review environmental regulation in India. According to terms of reference, the committee has reviewed which of the following environment laws

Choose the correct code:

Hydrogen chloride is a ___ made of H⁺ and Cl^- which are ___ and ___ respectively.

​Choose the correct option. Column A contains name of products of petroleum and column B contains their uses. Match them correctly

$$\begin{array}{cc}ColumnA& ColumnB\\ 1.LPG\left(Liquefiedpetroleumgas\right)& A.Paints,roadsurfacing\\ 2.Petrol& B.Fuelforhomeandindustry\\ 3.Bitumen& C.Ointments,candles,vaselineetc\\ 4.Paraffinwax& D.Motorfuel,aviationfueletc\end{array}$$

Give reason why :

(a) copper metal is used for making electric wires.

(b) graphite is used for making electrode in a cell.

(c) immersion rods for heating liquids are made of metallic substances.

Draw a labelled Fire Triangle. [2 MARKS]

Subscripts in the chemical formula X₂Y₃ denotes:

A. 2 atoms of X combine with 3 atoms of Y to form X₂Y₃

B.The subscript 2 denotes that valency of X is 2.

Why copper does not react with hydrochloric acid

Which among the following categories of substances absorbs atmospheric moisture and forms a saturated solution?

How can the permanent hardness of water be removed?

Why mercury is considered as a metal ?

Question 21
Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by___ substances which have a ___ effect on both the ___ and ___, it is referred to as ___. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ___ are responsible for causing ___ pollution. Petroleum ___ are a major source of ___ pollutants like ___ and ___. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ___ your teeth, leaving the ___ running may waste several ___ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for ___ is called ___ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ___and ___ impurities. (insects, microorganism, particles, dissolved, harmful).