science important question of chemistry class 10th

science important question of chemistry class 10th

Aditya Raj Anand

Saturday, 15 February 2020

science class 10

important question of chemistry class 10th

here is the collection of science important question of chemistry class 10th, important question science class 10 cbse 2020 final exam, science laws, science facts, science news, science Principal, and much more.
If you can do all the question then you have a potential to score good marks because there is a science chapter wise question and all the question is just a basic and taken to the chapter so if any on can do all the below question then they are ready to give science exam.

science chapter wise chemistry class 10 important question

Chemical reaction and equation

1. On what basis is a chemical equation balanced?
2. Give one example of chemical reaction.
3. What type of reaction is represented by the digestion of food in our body.
4. What is decomposition reaction? Give an example of decomposition reaction.
5. Define oxidation and reduction.
6. Define a combination reaction.
7. What is a redox reaction? explain with an example.
8. Two metals X and Y from the salts Xso4 and Y2so4, respectively. the solution of salt Xso4 is blue in color whereas that of Y2so4 is colorless. when barium chloride solution is added to Xso4 solution, then a white precipitate Z is formed along with a salt which turns the solution green. and when barium chloride solution is added to Y2so4 solution, then the same white precipitate Z is formed along with colorless common salt solution.                                                1. what could the metal X and Y be and also write the name of Z.
9. What happen when an aqueous solution of sodium sulphate react with an aqueous solution of Barium chloride?
10. Write the balanced chemical equations for the reaction which take place in the above question.

Acid Base and Salt

1. What is an indicator? Name three common indicators.
2. Name the Acid, Base indicator extracted from lichen.
3. Write the help of level diagram, describe an activity to show that Acids produced ions only in a aqueous solution.
4. Fresh milk has a pH of 6. when it changes into curd, will its pH value increase or decrease? why?
5. What is an universal indicator? for what purpose is it used?
6. The pH of soil A is 7.5 while that of soil be is 4.5. which of the two soils, A or B should be treated with powdered chalk to adjust its pH and why?
7. Why is sodium chloride required in our body?
8. Name the major salt present in sea water.
9. What is washing soda? state two properties and two uses of washing soda.
10. What is the common name of sodium hydrogen carbonate?

Metals and non metals

1. Name one metal and one non metal which exist in liquid state at room temperature.
2. Write the names and formula of a metal hydride and a non metal hydride.
3. Name a non metal having a very high melting point.
4. Difference between metal and non metal.
5. Write the properties of metal and non metal.
6. Name a carbon containing molecules which has two double bonds.
7. What is the difference between a cation and an anion? How are they form? give the names and symbols of one cation and one anion.
8. Name five method of preventing rusting of iron. 
9. Explain why an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
10. What is corrosion?

Carbon and its compound science important question

1. Name the element whose one of the allotropic forms is Buckminsterfullerene.
2. Write the structural formula of propane.
3. Write the molecular formula of ethanol.
4. Write the formula of the functional group present in carboxylic acid.
5. How would you convert ethanol into ethene?
6. Name the functional group of organic compounds that can be hydrogenated. with the help of suitable example, explain the process of hydrogenation, mentioning the conditions of the reactions and any one change in physical property with the formation of the product. name any one natural source of organic compounds that are hydrogenated.
7. State two use of ethanol.
8. why is ethanol used as a fuel?
9. Explain why methanol is much more dangerous to drink than ethanol.
10. What happen when ethanoic acid react with sodium hydroxide? write equation of the reaction involved.

periodic classification of elements science important question

1. on what basis did Mendeleev arrange elements in his periodic table?
2. A, B and C are the elements of a Dobereiner's triad. if the atomic mass of 'A' is 7 and that of 'C' is 39, what should be the atomic mass of 'B' ?
3. X and Y are the two elements having similar properties which obey new lands law of octaves. how many elements are there in between X and Y?
4. Why do we classify elements?
5. How would the tendency to gain electrons change on moving from left to write period of the periodic table?
6. How does the size of atoms generally vary in going from left to right in a period of the periodic table?
7. What are the period and groups in a periodic table? give to characteristics of each.
8. How does the electro positive character of elements change on going down in a group of the periodic table?
9. What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
10.  The atomic radii of thee elements X, Y and Z of a period of the periodic table are 186 pm ; 104 pm ; and 143 pm; respectively. giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

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