Here I am looking for the last year SSC (X) - Science Question paper of CBSE English Medium, can you please provide me the same???

As you are looking for the last year SSC (X) - Science Question paper of CBSE English Medium, so here I am sharing the same with you

An element ‘X’ on reaction with dilute acid evolves a gas that burns with a pop sound, while a 570043 compound ‘Y’ on reaction with dilute acid evolves a gas that turns lime water milky. Identify X and Y.

Give an example of a metal which is the best conductor of heat


Why is CNG considered an environmental friendly fuel ?

Name the physical quantity which is same in all the resistors when they are connected in series.

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y, Z.

1. Give an example of an endothermic reaction.

2. Write two observations you would make when quick lime is added to water.

3. Classify the following reactions into slow and fast reaction:
Reaction between an acid and a base, Rusting of iron.

4. What is the S.I. unit of electric potential?

5. What is an oxidation reaction? Identify in the following reaction
The substance oxidized and (ii) the substance reduced: ZnO + C → Zn + CO

6. Why does carbon form compounds mainly by covalent bonding?

7. List any two reasons for carbon forming a very large number of compounds.

8. An organic acid ‘X’ is a liquid which often freezes during winter time in cold countries, has the molecular formula, C2H4O2. On warming it with ethanol in the presence of a few drops of concentrated sulphuric acid, a compound ‘Y’
with a sweet smell is formed. Identify ‘X’ and ‘Y’. Write a chemical equation for the reaction involved.

9. What is a homologous series of compounds? List any two characteristics of a homologous series.

10. What would be observed on adding a 5% solution of alkaline potassium permanganate solution drop by drop to some warm ethanol taken in a test tube?

11. Write the name of the compound formed during the chemical reaction.

12. How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?

13. Choose a metal out of the following which reacts with hot water but not with cold water: Sodium, Magnesium, Iron
Mention the products formed during the reaction.

14. Out of the two, equatorial and polar orbits of man-made satellites, which one is suitable for collection of data for weather prediction? Why?
a. What is meant by pH of a solution?
b. State one difference between a strong electrolyte and a weak electrolyte.Give one example of each.

15. Give the names of the functional groups
— CHO
|
— C=OH

16. Give Arrhenius definition of an acid and a base. Choose strong acid and strong base from the following :
CH3COOH, NH4OH, KOH, HCl.

17. Name the raw materials that are required for the manufacture of washing soda by Solvay Process. Describe the chemical reactions involved in the process.

18. What is ‘liquor ammonia’? Describe with a diagram, ‘Fountain Experiment’ to demonstrate the following properties of ammonia: high solubility in water. its alkaline nature.

19. Give reasons for the following:
A peculiar smell is observed near the preserved specimens in biology laboratory. Methanol undergoes addition reaction with hydrogen cyanide, Propanone can be used as a nail polish remover. Why sulphuric acid is called ‘King of Chemicals’?

20. Describe the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the ‘Contact Process’.

21. Why should water be never added dropwise to concentrated sulphuric acid?

22. Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognized?

23. What happens chemically when quick lime is added to water?

24. What is meant by water of crystallisation in a substance? How would you show that blue copper sulphate crystals contain water of crystallisation?
1. Name a metal which is both ductile as well as malleable.
2. What is an alloy? Name the constituents of 22- carat gold. Why is 24-carat gold converted to 22-carat gold ?
3. Name an important ore of iron. Write its formula. How is this ore concentrated? Describe with chemical equations, the reactions taking place in the furnace to obtain iron from the concentrated ore.
1. Name one main ore of Aluminium. Write its formula. Which two main impurities are associated with this ore?
2. Describe with chemical equations, the method employed for the enrichment of the above named ore.
1. From amongst the metals sodium, calcium, aluminum, copper and magnesium, name the metal
Which reacts with water only on boiling, and Another which does not react even with steam.
1. Draw a labelled diagram to show the extraction of sulphur by Frasch process
1. What is a Galaxy?
2. What is Tollen’s reagent? What would you observe on heating Tollen’s reagent with formalin in a test tube?
1. Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface.