Chemistry Homework For Summer Vacation

Chemistry 10th Home work for summer vacations: Syllabus: chapter No 11-14 Multiple choice questions: 1. It is not used for the preparation of hydrogen gas: (a)

HCl

(b)

H2SO4

(c)

HNO3

(d)

H3PO4

2. Which on of the following metals is used to prepare hydrogen gas industrially: (a)

Sodium

(b)

Potassium

(c)

Calcium

(d)

Iron

3. The catalyst used for the preparation of water gas is: (a)

Nickel

(b)

Platinum

(c)

Calcium

(d)

Zinc Oxide

4. A metal which does not react with cold water is: (a)

K

(b)

Na

(c)

Ca

(d)

Mg

5. Oxidation state of hydrogen in KH is: (a)

+1

(b)

+2

(c)

Zero

(d)

-1

6. In copper sulphate, the number of crystalline water molecules are: (a)

4

(b)

3

(c)

2

(d)

5

7. Which one of the following will convert Fe+3 to Fe+2: (a)

[H]

(b)

KMnO4

(c)

H2O2

(d)

K2Cr2O7

8. When aluminium carbide reacts with water forming aluminium hydroxide and: (a)

Water gas

(b)

Ethene gas

(c)

Methane gas

(d)

Ethane gas

9. The physical association of water molecules with ions is called:

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(a)

Salvation

(b)

Hydration

(c)

Hydrolysis

(d)

Hydrogenation

10. Compounds which absorb moisture on exposure to the atmosphere are called: (a)

Ionic Compounds

(b)

Amorphous Compounds

(c)

Hygroscopic Compounds

(d)

Hydrated Compounds

11. Hydrogen and halogen require electrons to complete their outer most shell (a)

One

(b)

Two

(c)

Three

(d)

Four

12. When water turns into ice, the average distance between its molecules: (a)

Remains the same

(b)

Decreases

(c)

Increases

(d)

Depends upon hardness of water

13. Temporary hardness of water can be removed by adding an estimated amount of: (a)

Caustic soda

(b)

Sodium bicarbonate

(c)

Slaked lime

(d)

Washing Soda

14. Many acids produce by giving their protons to water: (a)

Hydride ion

(b)

Hydrate ion

(c)

Hydroxyl ion

(d)

Hydroxonium ion

15. Water is a atomic molecule: (a)

Mono

(b)

Di

(c)

Tri

(d)

Tetra

16. Which is not chemically a calcium carbonate: (a)

Chalk

(b)

Gypsum

(c)

Lime stone

(d)

Marble

(b)

Dolomite

17. CaCO3. MgCO3 is known as: (a)

Marble

(c)

Granite

(d)

Gypsum

18. Graphite is also called: (a)

Charcoal

(b)

Carbon Black

(c)

Lead Black

(d)

Bucky Balls

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19. The percentage of Carbon in coal is: (a)

60-75%

(b)

50-80%

(c)

90-95%

(d)

80-90%

20. Soda water contains: (a)

O2

(b)

HCl

(c)

CO2

(d)

CO

21. The correct temperature condition for preparation of CO from coke is: (a)

200oC

(b)

400oC

(c)

800oC

(d)

1000oC

22. The formula of phosgene gas is: (a)

PH3

(b)

HOCl

(c)

COCl2

(d)

CCl4

23. The purest form of silicon dioxide is: (a)

Flint

(b)

Sand

(c)

Quartz Crystal

(d)

Onyx

24. Which of the following statements about silicon and its compound is incorrect: (a)

Silicon is semi-conductor

(b)

Silicon is a metalloid

(c)

Silicon is an acidic oxide

(d)

Formula of silicate is SiO3

25. Silicon dioxide is soluble in: (a)

Sulphuric acid

(b)

Hydrochloric acid

(c)

Nitric acid

(d)

Hydrofluoric acid

26. Which of the following is used for the manufacture of glass: (a)

Carbon

(b)

Silicon

(c)

Nitrogen

(d)

Calcium carbonate

27. In the structure of diamond carbon atoms are arranged in the form of: (a)

Hexagonal

(b)

Polyhedral

(c)

Pentagonal

(d)

Tetrahedral

28. Amethyst quartz is coloured violet due to the presence of: (a)

Silica

(b)

Sodium

3

(c)

Calcium

(d)

Iron

29. The formula of Olvine is: (a)

FeMnSiO4

(b)

HeMgSiO4

(c)

FeMgSeO4

(d)

FeMgSiO4

30. Melting point of sodium silicate is: (a)

590oC

(c)

1090oC

(b) (d)

990oC

890oC

31. The most abundant solid compound of nitrogen found on earth’s crust is: (a)

Potassium nitrate

(b)

Sodium nitrate

(c)

Sodium chloride

(d)

Urea

The catalyst used in the manufacture of ammonia is: (a)

Copper Oxide

(b)

Chromium Oxide

(c)

Zinc Oxide

(d)

Iron Oxide/Aluminium Oxide

32. On commercial scale, ammonia is prepared by: (a)

Ostwald’s process

(b)

Solvay’s process

(c)

Haber’s process

(d)

Contact process

33. Pure nitric acid boils at: (a)

56oC

(b)

66oC

(c)

76oC

(d)

86oC

34. Ammonia and carbon dioxide at high temperature and pressure form: (a)

(NH4)CO3

(b)

CO(NH2)2

(c)

NH4CO3

(d)

(NH)3CO2

35. Carbonates and bicarbonates react with dilute nitric acid to give: (a)

Carbon dioxide and salt

(b)

Nitrogen peroxide and salt

(c)

Nitrogen and Oxygen

(d)

Carbon and salt

36. Magnesium react with dilute nitric acid to give: (a)

Oxygen gas

(b)

Hydrogen gas

(c)

Carbon dioxide gas

(d)

Water gas

37. Nitric acid has no effect on:

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(a)

Magnesium

(b)

Mercury

(c)

Platinum

(d)

Zinc

38. The catalyst used for the preparation of Oxygen gas in laboratory is: (a)

ZnO

(b)

Cr2O3

(c)

MnO2

(d)

Pt/Pd

39. The binary compounds of Oxygen with other elements are called: (a)

Normal Oxides

(b)

Peroxides

(c)

Super oxides

(d)

Oxides

40. Methane, burns in oxygen with: (a)

yellow flame

(b)

Green flame

(c)

Blue flame

(d)

Red flame

41. In SO2 the valence number of oxygen is (a)

+1

(b)

-1

(c)

-2

(d)

-1/2

42. The colour of hydrogen peroxide is: (a)

White

(b)

Dark Blue

(c)

Yellow

(d)

Plate Blue

43. Gain of electron is called: (a)

Oxidation

(b)

Reduction

(c)

Redox

(d)

Addition

44. The atmosphere around earth is divided into layers: (a)

Two

(b)

Three

(c)

Four

(d)

Five

45. Harmful ultra violet radiations coming from the sun are absorbed by: (a)

Oxygen

(b)

Ozone

(c)

Hydrogen

(d)

Carbon dioxide

46. The formula of Galena is: (a)

FeS2

(b)

HgS

(c)

ZnS

(d)

PbS

47. The crystals of rhombic Sulphur are: (a)

Needle like

(b)

Octahedral

5

(c)

Cubic

(d)

Tetrahedral

48. From under ground deposits, Sulphur is extracted through: (a)

Contact process

(b)

Solvay’s method

(c)

Frasch Method

(d)

Haber’s process

49. Plastic Sulphur is stable below: (a)

130oC

(b)

141oC

(c)

151oC

(d)

161oC

50. Catalyst employed in contact process is: (a)

P2O5

(b)

V2O5

(c)

MnO2

(d)

Fe2O3

51. Sulphuric acid freezes at: (a)

0oC

(b)

10oC

(c)

5oC

(d)

20oC

52. Which statement is not true for H2SO4: (a)

Petroleum refining

(b)

Electrolysis

(c)

Dehydrating agent

(d)

Preservation of wood

53. The formula of Oleum is: (a)

H2SO4

(b)

H2S2O7

(c)

H2SO7

(d)

H2S2O2

54. MgSO4.7H2O is called: (a)

Epsom salt

(b)

Gypsum

(c)

Heavy spar

(d)

Cinnabar

55. The increase in viscosity of plastic Sulphur after heating is due to break up S8 molecules into: (a)

S6 and S2

(b)

S4 and S4

(c)

S3 and S5

(d)

S1 and S7

56. Sulphur reacts with Iron when heated to produce: (a)

Iron sulphate

(b)

Iron bisulphate

(c)

Iron Sulphur

(d)

Iron sulphide

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57. Sulphuric acid is acid: (a)

Monobasic acid

(b)

Dibasic acid

(c)

Digestive acid

(d)

Tribasic acid

58. Dehydration means removal of: (a)

Impurities

(b)

Oxygen

(c)

Water

(d)

Electron

59. The cleaning of metals by removing the surface oxide coating is called: (a)

Picking

(b)

Pickling

(c)

Poking

(d)

Passing

60. Sulphuric acid can dehydrate the glucose into: (a)

CO

(b)

CO2

(c)

C

(d)

H2CO3

Short Questions: 1) Hydrogen is first element of the periodic table: i) Give its abundance in the universe and on earth crust? ii) What was the old name of hydrogen? iii) Name some compounds of hydrogen? 2) A teacher asked to the students to prepare hydrogen gas in laboratory without using Zn. i) Which method should they adopt? ii) Write down balance chemical equation for this reaction? iii) Why nitric acid is usually not used with Zn? 3) Hydrogen gas is prepared industrially by the use of water gas. i) Write down two methods to prepare water gas? ii) How hydrogen is separated from water gas, give equation? iii) Which catalyst is used for this purpose? Also define catalyst? 4) Hydrogen has one electron in its outermost shell. i) Draw its structure? ii) What ions are formed when hydrogen loses and gains one electron? iii) Draw the structure of both ions? 5) Hydrogen shows a wide variety of chemical reactions. 7

i) Give its reactions with non metals? ii) How it can reduce metal from its oxides? Give two examples? iii) How it can reacts with metals to produce metals hydrides? 6) Nascent hydrogen is more reactive than molecular hydrogen. i) Define nascent hydrogen? ii) How nascent hydrogen is produced? iii) How FeCl3 is reduced to FeCl2. 7) Water molecules are simplest triatomic molecules. i) Draw the structure of water molecule? ii) How many lone pairs are present in each water molecule? iii) Why boiling point of water is higher than other chemically similar compounds (for example, H2S, H2Se). 8) Water is a polar compound showing H+ and OH- ions in its reactions. i) Define amphoteric compounds? ii) Why water behaves as an amphoteric compound? iii) Give acid base reaction of water to support your answer? 9) Water reacts with metals to give variety products. i) Which gas is usually produced by treating it with metals? ii) Why it reacts with K, Na and Ca at cold state while with Mg, Zn, and Fe in vapour state? iii) Give reaction of hydrogen with all of the above mentioned metals? 10) Water can be used to prepare hydrocarbons. i) Which gases are produced from metallic carbides? ii) Write down balance chemical reactions? iii) How water can act as a universal solvent? 11) Quality of water can be assessed by various parameters. i) Draw the table of parameters to check the quality? ii) List down other impurities In addition to the impurities which cause hardness? iii) Give out composition of industrial wastes? 12) Carbon is non metal belongs to the IV period. i) Give its abundance in world and in earth crust?

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ii) Name the various compounds in which ‘C’ exists? iii) Define allotropy and name the allotropic forms of Carbon? 13) Diamond is the purest form of ‘C’. i) Where it is found? ii) Give its properties and density? iii) What is the arrangement of carbon in the diamond? Draw its structure. 14) Graphite is also called Lead Black. i) Why layers of graphite slip over each other? ii) Why it is conductor while Diamond is non conductor? iii) Give out uses of graphite? 15) Bucky Balls are discovered in 1985. i) How many carbon atoms are present in them? ii) What is the arrangement of carbon atoms? iii) Give the uses of Bucky Balls. 16) Coal is amorphous form of carbon. i) How it is formed? ii) What is the composition of coal? iii) How coal gas, coal tar and is coke is formed? 17) Charcoal is porous and brittle solid. i) How it is formed? ii) What is activated charcoal? iii) Pen out some uses of charcoal? 18) Chemically C is not too much reactive. i) Complete and balance these equations.

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+

CO2

+

CO

C

+

H2

C

+

Al

19) CO2 shows acidic nature in its chemical reactions. i) Why it is used in fire extinguishers? ii) What is dry ice? What is its use? iii) Give physical properties of CO2? 20) When fuel is burnt in limited supply of air CO is produced. i) Why it is poisonous? ii) How it is produced in the laboratory from oxalic acid? iii) Is it possible to separate the mixture of CO and CO2? If yes then how? 21) Consider the following equation: CO +

CI2

COCl2

i) Name the reactants and product? ii) Which gas/gases is/are poisonous? iii) What is the use of product in the war? 22) Silicon is shiny silvery solid. i) Why it does not occure in the free state? ii) What are the pure and impure forms of silicon dioxide? iii) Why C-C bond is stronger than Si-Si bond? 23) Silicones are very useful compounds of silicon. i) These are made up of which things? ii) Write down the structure of methyl silicon polymer? iii) Give some uses of silicones? 24) Silicon dioxide occures in various crystalline forms. i) Name the crystalline forms of silicon dioxide? 10

ii) Quartz colourless but some times it is found in coloured why? iii) Draw the structure of silica? 25) Silicate minerals are the salts of silicic acid. i) What is the formula of silicic acid? ii) Which is the principal component of the earth crust? iii) How that component is formed? iv) Which ions are embedded in that structure? 26) Silica gel has ability to absorb volatile solvents. i) How silica gel is prepared? ii) Medicine bottles usually contain the packets of silica gel why? iii) What is its use in petroleum? 27) ‘N2’ is found in both free and combined state in nature. i) In which form it is present in the human body? ii) Name some materials in which ‘N2’ is present in combined form? iii) Draw the structure of ‘N2’ and ammonia? 28) ‘N2’ is chemically inert at ordinary conditions. i) How we can get nitric oxide and calcium nitride from it? ii) Complete and balance the equations? o

CaC2

+

N2

CaC2

+

H2O

C

+ +

iii) In electric bulbs, usually N2 is present why? 29) Haber was awarded Nobel Prize in chemistry in 1918. i) What was the reason behind it? ii) Write down balance chemical equation with all necessary conditions in the process of manufacture of ammonia? iii) Have you in mind is their any other method to prepare ammonia? 30) Ammonia is colourless gas with pungent smell. i) Under what condition it decomposes write equation? ii) How urea can be prepared starting from CO2?

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iii) Give out some uses of ammonia? 31) When brown vapours of a chemical ‘X’ are cooled down they become colourless. i) Name that chemical? ii) Write down industrial method for the preparation of above mentioned chemical? iii) Write down physical properties of it? 32) Life is not possible without oxygen. i) Which is the most abundant compound of the oxygen on earth? ii) How many electrons are present in its outer most shell and how can it attain the next inert gas configuration? iii) Draw the structure of water and Oxygen? 33) A gas is produced by using MnO2 as a catalyst having the density equal to that of air. i) Write down balance chemical equation to prepare that gas? ii) Give the reaction of that gas with metals? iii) How we can confirm the presence of that gas? 34) H2O2 is pale blue syrupy liquid. i) How it is prepared in laboratory? ii) Which method is more convenient and why? iii) How it can act as a reducing agent. Support your answer by balance chemical equations? 35) Ozone is triatomic form of Oxygen. i) How we can prepare it commercially? ii) What are its physical properties? iii) Why Ozone is much more reactive than Oxygen? 36) Ozone protects our earth from harmful radiations coming from sun. i) How ozone layer is depleted? ii) Why chlorine act as a catalyst? iii) Give out concentration of ozone in stratosphere? 37) ‘S’ is known since prehistoric time. It occures in nature both in free and in combined form. i) Where it exists in free form?

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ii) Name all sulphide and sulphate ores? iii) In which form it is present in natural gas? 38) ‘S’ exists as ‘S8’ molecules at room temperature. i) What is the effect of heat on it? ii) What happened when molten sulphur is heated more strongly? iii) Draw the entire figure related to the above heating process? 39) ‘S’ has three allotropic forms. i) How allotropic forms are interconverted? ii) Define transition temperature? iii) Give physical properties of ‘S’? 40) Give out the reactions of Sulphur with i) Metals ii) Non-metals iii) Oxidizing agents 41) Sulphur is usually sold as flowers of sulphur. i) What is meant by vulcanization of rubber? ii) Name the chemicals prepared from it used for bleaching wood pulp? iii) What is the medicinal use of ‘S’? 42) Sulphuric acid is known as king of chemicals. i) Why it is advised to add Sulphuric acid into water for its dilution? ii) What are hygroscopic compounds? iii) Show its ionization in water? 43) Give out the reactions of Sulphuric acid with i) Alkalies at cold and hot state? ii) Metals iii) Non-metals 44) Conc. Sulphuric acid is dehydrating agent. i) What are dehydrating agents? ii) How alcohol is converted in ethane? iii) Why colour of copper sulphate changes from blue to white by treating it with conc. sulphuric acid.

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45) Pen out the uses of sulphuric in the following industries. i) Fertilizers ii) Cleaning of metals iii) Pigments

Long Questions: 1) Water has ability to dissolves large amount of natural salts. i) Differentiate between soft and hard water? Give the types of hard water? ii) Write down all the methods for removal of temporary and permanent hardness of water? iii) What are the causes of hardness of water also write down the disadvantages of hard water? 2) CO2 is very important gas used in the process of photosynthesis. i) How CO2 can be prepared in laboratory and industrially? ii) Write down its physical and chemical properties? iii) Enlist the main uses of CO2? 3) Silicon dioxide is used in making the laboratory apparatus. i) How it is prepared, write down its physical and chemical properties? ii) What are the uses of silicon dioxide? iii) Draw the structure of silicates, and give few examples of it? 4) Nitrogen is an inert gas present about 78% by volume in the air. i) How N2 can be prepared in laboratory and industrially? ii) Write down its physical and chemical properties? iii) What are its uses? 5) Write down laboratory method of preparation of HNO3? i) Write down its physical and chemical properties? ii) How it can act as an oxidizing agent? iii) What are its uses? 6) Oxides are binary compounds of oxygen. i) What are the main types of oxides? Give your answer in detail? ii) Write down the uses of oxygen? iii) How H2O2 can act as reducing agent? Write down its uses? 14

7) Differentiate between oxidation and reduction in detail? 8) How various allotropes of sulphur are prepared? What are their properties? 9) How extraction of sulphur is carried out? Draw its labeled diagram. i) What are its physical and chemical properties? Give its uses. ii) Write down the uses of oxygen? 10) How sulphuric acid is manufactured by contact process. Write down all steps in detail? Also draw the labeled diagram?

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