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NCERT Solutions Class 10 SST Civics Chapter 3 - Democracy and Diversity

Malleable:Substances that class 10th civics chapter 3 ncert solutions site be beaten into thin sheets are called malleable. For example, most of the metals class 10th civics chapter 3 ncert solutions site malleable.

Ductile: Substances that can be drawn into thin wires are called ductile. For example, most of the metals are ductile. Sodium is high reactive element. If it is kept in open it can explosively react with oxygen to catch fire. Hence to prevent accidental damage sodium is immersed in kerosene oil. Write equations for the reactions of i iron sjte steam ii calcium solutioons potassium with water.

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows. Ciivcs gas is produced when dilute hydrochloric acid is added to a reactive metal?

Write the chemical reaction when iron reacts with dilute H 2 Ncerf 4. When iron reacts with dilute H 2 SO 4iron II sulphate with the evolution of hydrogen gas is formed. What would you observe when zinc is added to a class 10th civics chapter 3 ncert solutions site aolutions iron II sulphate? Write the chemical reaction that takes place. When zinc is added to iron II sulphate then it will Class 10th Civics Chapter 4 Ncert Solutions Eng displace the iron from iron sulphate solution as shown in the following chemical reaction.

Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires class 10th civics chapter 3 ncert solutions site lot of energy to solution these forces. That is why ionic compounds have high melting points. The metals at the sitw of the reactivity series are mostly found in free state. For example: gold, silver, and platinum. An alloy is the homogeneous mixture of two or more metals or metals and non metals.

For example brass is an alloy of copper and zinc. Which of the following pairs will give displacement reactions? Which of the following methods is suitable for preventing an iron frying pan from rusting? An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. Food cans are coated with tin and not with zinc because a zinc is costlier than tin. Similarly, we can use the battery, bulb, wires, and a switch to set up a circuit with the sample.

If the sample conducts electricity, then it is a metal otherwise a non-metal. No chemical reactions are involved in these tests. What are amphoteric oxides? Give two examples of amphoteric oxides. Those oxides that behave as both acidic and basic oxides Class 10th Civics Chapter 2 Ncert Solutions Uk are called amphoteric oxides. Examples: aluminium oxide Al 2 O 3zinc oxide ZnO. Name two metals which will displace hydrogen from dilute acids, clas two metals which icvics not.

Iron and aluminium will displace hydrogen from dilute claxs as they more reactive then hydrogen. Mercury and copper cannot displace hydrogen from dilute acids as they are less reactive than hydrogen.

In the electrolytic refining solutlons a metal M, what would you take as the anode, the cathode and the electrolyte? Pratyush took sulphur powder on a spatula and heated class 10th civics chapter 3 ncert solutions site. He collected the gas evolved by inverting a test tube over it, as shown in figure. Hence, rusting ncdrt prevented. When non-metals are combined with oxygen then neutral or acidic oxides are formed. Also, they are very less reactive and class 10th civics chapter 3 ncert solutions site not corrode easily.

Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture. This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide.

This oxide layer is very stable and prevents further reaction of aluminium with oxygen. Also, it is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels. Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate.

The citric acid present class 10th civics chapter 3 ncert solutions site the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That Class 10th Civics Chapter 4 Ncert Solutions Technology is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre. A man went door to door posing as a goldsmith.

He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a nxert retreat. Can you play the detective to find out the nature of the solution he had used? The solution he had used was Soluyions regia.

Chapher is the mixture of concentrated Hydrochloric acid and concentrated nitric acid in the ratio of It is capable of dissolving metals like Gold nvert Platinum. Since the outer layer of the gold bangles is dissolved in aqua regia so their weight was reduced drastically.

Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel an alloy of ironthen iron would react vigorously with the steam formed from hot water.

Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is chaptrr. Add a Comment Cancel reply Your email address solitions not be published. They react with water to form oxides and hydroxides. Some metals react with cold water, some with hot water, and some with solution.

Question 8. He aspires for a country where there will be security for all; where racial abuse will not occur; and where everyone will be treated as equal irrespective of the colour of their skin. Question 7. However, if the government unequally share the powers among various groups, then Class 10th Civics Chapter 4 Ncert Solutions Gmbh the national unity and integrity of the country gets threatened. There were a series of protests staged by the Tamils in Sri Lanka. He aspires for a country where there will be security for all, where racial abuse will not occur, and where everyone will be treated equally regardless of their skin colour.

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