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Which of the following is an example of a mixture?

Question 14
'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

The pH of water at ${25}^{\circ }C$ is nearly

Can you name four fuels used in our homes? [2 MARKS]

Coaltar is main source of

The process in which a compound is decomposed to its constituents is called chemical ___.

Usually, ___ does not have the independent existence, therefore they combine with each other to form stable particles.

Choose the correct example for a true solution.

Identify the material used for making microwave ovenware?

The oxidizing properties of Nitric Acid is due to :

Why do molecules attract

How do the following help in bringing about a chemical change ? Explain each with a suit able example.

(a) pressure (b) Light

(c) catalyst (d) heat.

If sugar is dissolving in water then we refer it as ____________ of sugar.

Which of the following are correct with respect to chemical reactions?

Which of the following is not a product of destructive distillation of coal?

S=ut-1/2gt²

^{find g by making it the subject in the above formula}

^{also find its value if}

^t=2.5

^s=45

^u=50

What is the term used for the reagent which causes another atom in a redox reaction to undergo oxidation, and is itself is reduced?

Name the various zones of a candle flame. Which zone (or part) of a candle flame is the least hot (or coldest) ?

The values of ∆H for endothermic and exothermic reactions are

Select the statement(s) that are related to Chromatography.

Can a compound be organic and inorganic?

We can store CuSO₄ in silver vessel but not in silver nitrate why explain

Which of the following is kept under kerosene:

The metal which is stored in kerosene is:

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:

Explain the use of plastics in health care industry. [2 MARKS]

Polonium is named after ________.

Name the metal which is used in making thermometers.

Roots hairs help to absorb water -Give reasons

A cubical metal block of edge 12 cm floats in mercury with one fifth of the height inside the mercury. Water is poured till the surface of the block is just immersed in it. Find the height of the water column to be poured. Specific gravity of mercury = 13.6.

Let's suppose you have four solutions of salt water. Solution 1 has 55 g of salt dissolved in 445 mL of water. Solution 2 has a concentration of 21 %. Solution 3 has 36 g of salt dissolved in 108 mL of water. Solution 4 has a concentration of 23 %. Which of the following lists the solutions in order from the least concentrated to the most concentrated?

The volume of hydrogen and oxygen obtained on electrolysis of water is in the ratio ___.

Which of the following is not a greenhouse gas?

(a) carbon dioxide

(b) nitrous oxide

(c) methane

(d) nitrogen

What depletes the ozone layer in the atmosphere? What are the harmful effects of the depletion of the ozone layer on us?

Which of the following will reach the earth in greater amounts if the amount of chlorofluorocarbons released into the air increase?

(a) Infrared rays

(b) X - rays

(c) Gamma rays

(d) Ultravilolet rays

Electrons are ___ charged particles.

Which among the following are biodegradable substances?

An element forms an oxide which is basic in nature.State whether the element is a metal or non-metal ?

An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be:

(a) magnesium

(b) potassium

(c) phosphorous

(d) aluminium

Identify the popular water purification technique that is used in domestic cities.

If we heat water then it converts to water vapour and this phase transition is called ___ .