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G7 UT 2 Endgame

Total questions: 100

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

Water is a

a)

Compound

b)

Molecule

c)

Mixture

2.

The boiling point of water on Mount Everest is

a)

Less than 100 degree Celsius

b)

More than 100 degree Celsius

3.

Water is ______ to litmus

a)

ACIDIC

b)

Basic

c)

Neither acidic nor basic / Neutral

4.

A molecule of di hydrogen oxide is

a)

Polar

b)

Stable

c)

Both

5.

The atomic mass of any element is dependence on

a)

Protons

b)

Neutrons

c)

Both

6.

Hydrogen and oxygen retain their original properties in water

a)

True

b)

False

7.

Ice has less density than water

a)

True

b)

False

8.

_______ substances can dissolve in water

a)

Polar

b)

Non polar

9.

Oxygen can support combustion

a)

True

b)

False

10.

________ is connected to the negative terminal of the battery in Hoffman voltameter

a)

Cathode

b)

Anode

11.

Water is _________ solvent due to________ property

a)

Universal, Polarity

b)

Partial. Neutral

12.

The property of solubility is due to _______ of water

a)

Polarity

b)

Combustion

13.

Tap water is _______ conductor of electricity

a)

Good

b)

Bad

14.

The volumetric ratio of hydrogen to oxygen in water molecule is

a)

2:1

b)

1:2

15.

If hydrogen collected is 10 volumes, what will be the volume of Oxygen connected

a)

2.5 volumes

b)

10 volumes

c)

5 volumes

16.

Electrodes in Hoffman voltameter are made up of

a)

Platinum

b)

Silver

17.

Hydrogen gas is collected at ________ limb and oxygen gas is collected at _______ limb in Hoffman voltameter

a)

Cathode, anode

b)

Anode, cathode

18.

The mass ratio of hydrogen to oxygen in a molecule of water is

a)

1:8

b)

8:1

19.

What is the drying agent used to dry jet of hydrogen in the industrial method

a)

Calcium chloride

b)

Anhydrous calcium chloride

20.

Hydrocarbons are

a)

Compounds made up of hydrogen and carbon

b)

Compounds made up of hydrogen and nitrogen

21.

Hydrocarbons react with oxygen to give carbon dioxide and water is knowns as

a)

Combination reaction

b)

Decomposition reaction

c)

Combustion Reaction

22.

Plants grow in

a)

Pure water

b)

Impure water

23.

Boiling point of water is ________ and freezing point of water is _________

a)

100 degree Celsius, 0 degree Celsius

b)

0 degree Celsius, 100 degree Celsius

24.

When impurities are added to water, it's boiling point will ________ and freezing point will ________

a)

Increases, decreases

b)

Decreases, increases

25.

The phenomenon of rise in boiling point when impurities are added to water known as

a)

Elevation in boiling point

b)

Decrease in boiling point

26.

The density of water at 4 degree Celsius is

a)

1 g/cm3

b)

10 g/cm3

27.

Water has maximum density at _______ degree Celsius and minimum density at _______ degree Celsius

a)

4 , 0

b)

0, 4

28.

Water shows a unique property known as ______________ at ________ temperature.

a)

Anomalous expansion, 4-0 degree Celsius

b)

Anomalous expansion, 0-4 degree Celsius

29.

In a molecule of water, hydrogen atoms have a _____________ and oxygen atoms have a ___________. This property of water is known as ___________

a)

Slightly negative, slightly positive, polarity

b)

Slightly positive, slightly negative, polarity

30.

Which of the following compounds will not show deflection to a charged rod

a)

Ground nut oil

b)

Water

31.

The temperature required to decompose water molecule into its components is

a)

2000 degree Celsius

b)

20000 degree Celsius

32.

What can be added to water to produce ions and conduct electricity

a)

Salt

b)

Sugar

c)

Acid

33.

In which of the following reactions, water is used as catalyst

a)

Burning hydrogen in air

b)

Burning hydrocarbons in air

c)

Hydrogen + chlorine --> hydrochloric acid

34.

Water reacts with active metals like K Na and Ca to give

a)

Hydroxides and hydrogen

b)

Oxides and hydrogen

35.

What are the conditions required for rusting of iron

a)

Water

b)

OXYGEN

c)

Carbon dioxide

36.

Rust appears like

a)

Reddish brown powder coating

b)

Greenish yellow powdery coating

37.

The formula of rust is

a)

Fe2O3

b)

Fe2O3. H2O

38.

What is the chemical name of rust

a)

Ferric oxide

b)

Hydrated ferric oxide

39.

What is catalyst

a)

A substance which increases rate of reaction

b)

A substance which does not alter the rate of reaction but participates in the reaction

40.

Iron reacts with______ and _______ to form rust

a)

Water, oxygen

b)

Water and nitrogen

41.

What is the observation for gasses collected at cathode and anode in a voltameter

a)

At cathode- Squeaky pop sound is observed, At anode-Burning splint burns more brightly

b)

At cathode- burning splint burns more brightly, At anode-Squeaky pop sound

42.

Select all examples of hydrocarbons from the following

a)

CH4

b)

C2H6

c)

C3H4

d)

CO2

43.

Which of the following is an insoluble residue

a)

CaCO3

b)

MgCO3

c)

Ca(HCO3)2

44.

CaCO3 is _________ substance

a)

a soluble

b)

An insoluble

45.

Hard water develops a layer of ________ in hot water systems

a)

Ionic precipitates

b)

Scales

46.

Hard water_______ the efficiency of the machinery

a)

Increases

b)

Decreases

47.

Ca(HCO3)2 --> CaCO3 + CO2 + H2O is an example of

a)

Removal of temporary happened of water

b)

Cause of temporary hardness of water

48.

Temporary hardness of water can be removed by

a)

Boiling

b)

Addition of sodium carbonate

c)

Filtration

49.

Which of the following salts are present in temporary hardness of water

a)

Ca(HCO3)2

b)

Mg(HCO3)2

c)

CaCl2

d)

MgSO4

50.

What ions are present in permanent hardness of water

a)

Calcium

b)

Magnesium

c)

Chloride

d)

Sulphate

e)

Bi carbonates

51.

What ions are present in temporary hardness of water

a)

Calcium

b)

Magnesium

c)

Iron

d)

Sulphate

e)

Bi carbonates

52.

Bi carbonates decomposed on boiling gives

a)

Carbonate

b)

Carbon dioxide

c)

Water

d)

All the given options

53.

Soft water causes yellowing of laundry

a)

True

b)

False

54.

Ions that help teeth and bones

a)

Calcium

b)

Iron

55.

Heart diseases, Osteoporosis, gastrointestinal problems are cause by soft water

a)

True

b)

False

56.

Sulphate and chloride are present in temporary hardness of water

a)

True

b)

False

57.

Sodium carbonate removes

a)

Temporary hardness of water

b)

Permanent hardness of water

c)

Both

58.

Soft water helps in irrigation

a)

True

b)

False

59.

Soft water imparts pleasent taste to water

a)

True

b)

False

60.

_________ water gives more lather/ form with soap

a)

Soft

b)

Hard

61.

Select all decomposition reactions

a)

Ca(OH)2 --> CaO + H2O

b)

CaO + H2O --> Ca(OH)2

c)

Ca(HCO3)2 --> CaCO3 + H2O + CO2

d)

C + O2 --> CO2

62.

CaSO4 + Na2SO4 --> CaCO3 + Na2SO4

This reaction represents

a)

Removal of permanent hardness of water

b)

Removal of temporary hardness of water

63.

Which of the following compounds can be removed by filtration

a)

CaCO3

b)

MgCO3

c)

NaCl

d)

Ca(HCO3)2

64.

Softening of hard water means

a)

Removal of calcium and magnesium from the water

b)

Addition of calcium and magnesium to the water

65.

Water containing sodium content above the normal level is

a)

Advantage

b)

Disadvantage

66.

Calcium and magnesium are present in

a)

Temporary hard water

b)

Permanent hard water

c)

In both

67.

Soap scum is formed when

a)

Soap reacts with calcium and magnesium present in water

b)

Soap reacts with Sodium and potassium present in water

68.

Washing soda helps to

a)

Remove Chlirides , Sulphates

b)

Removed bi carbonates only

c)

Removes chloride and Sulphates and carbonates

69.

What property of water helps survival and existence of aquatic plants and animals.

a)

Anolous expansion of water

b)

Boiling point of water

c)

Freezing point of water

d)

Density of water which is more than ice

70.

Chemical name and formulas of rust is

a)

Fe2O3 , Ferric oxide

b)

Fe2O3.H2O , hydrated ferric oxide

71.

Drying agent used to dry jet of hydrogen gas is

a)

Anhydrous calcium chloride

b)

Calcium chloride

72.

Which of the following is not an example of chemical reactions

a)

Burning of paper

b)

Ripening of fruits

c)

Rusting of iron

d)

Water converting from its solid state to liquid state

73.

Production of Ammonia from nitrogen and hydrogen is an example of a ________ reaction

a)

Displacement

b)

Double displacement

c)

Combination

74.

Quick lime reacts with water to form

a)

Slaked lime

b)

Calcium hydroxide

c)

Calcium oxide

75.

Chemical name of slaked lime is

a)

Calcium oxide

b)

Calcium hydroxide

76.

Chemical name of quick lime is

a)

Calcium oxide

b)

Calcium hydroxide

77.

Select all combustion reactions

a)

Burning of wood

b)

Addition of quick lime to water

c)

Photosynthesis

d)

Respiration

78.

_______ is the opposite reaction to combination reaction

a)

Displacement

b)

Double displacement

c)

Combination or synthesis

79.

What is the colour of copper sulphate solution

a)

Blue

b)

Green

80.

What is the colour of ferrous sulphate solution

a)

Blue

b)

Green

81.

What happens when iron nail is placed in copper sulfate solution

a)

Blue colour turns to green

b)

Green colour turns to blue

82.

When iron nail is added to Cooper sulphate solution

a)

Iron is more reactive than Cooper so iron displaced copper from its salt solution, there fore the colour of the solution changed from blue to green

b)

Iron being less reactive than Cooper, so iron cannot displace copper from its salt solution so the colour of the copper sulphate solution remains blue

83.

What happens when metals like mercury , silver, gold, platinum are added to Cooper sulphate solution, state your observation

4 lines
84.

In laboratory preparation of hydrogen, (Zn + HCl --> ZnCl2 + H2). Can we use copper instead of zinc. Give reason

4 lines
85.

Select the metals more reactive then hydrogen

a)

Zinc, calcium, Potassium, iron

b)

Cooper, mercury, silver, gold, platinum

86.

In the displacement reaction of iron nails with copper sulphate _______ is more reactive than _________ is less reactive metal

a)

Cooper, zinc

b)

Zinc, Cooper

c)

Iron, Cooper

87.

The erode reaction taking place in the marble of Taj Mahal due to acid rain is an example of

a)

Combination or synthesis

b)

Displacement

c)

Double displacement

d)

Decomposition

88.

Adding iron nails to Cooper sulphate solution is an example of

a)

Combination

b)

Decomposition

c)

Displacement

d)

Double displacement

89.

In which of the following reactions, reactivity series of elements plays a prominent role

a)

Combination / synthesis

b)

Decomposition

c)

Displacement

d)

Double displacement

90.

Select all double displacement reactions

a)

CaCO3 + HNO3 --> Ca(NO3)2 + H2CO3

b)

AgNO3 + KI --> AgI + KNO3

c)

Fe + CuSO4 --> FeSO4 + Cu

91.

What are the observations of Fe2O3 and SO2+SO3 produced as the result of decomposition of ferrous sulphate solution

a)

Brown precipitate and odour of burnt sulphur

b)

Green precipitate, and odour of burnt sulphur

92.

In ________ reaction, heart is released or given our during the course of a reaction

a)

Exothermic

b)

Endothermic

93.

Select all combination reactions

a)

Addition of quick lime to water

b)

Production of carbon dioxide from carbon and oxygen

c)

Adding iron nails to Cooper sulphate solution

d)

Erode reaction taking place in Taj Mahal

94.

An acid which neutralises acidity in the stomach is

a)

Mg(OH)2

b)

HCl

c)

H2SO4

95.

Which of the following is a neutralisation reaction of antacid with hydrochloric acid present in the stomach

a)

Mg(OH)2 + HCl --> MgCl2 + H2O

b)

AgNO3 + KI --> AgI + KNO3

c)

CaCO3 + HNO3 --> Ca(NO3)2 + H2O + CO2

96.

ENLIST all the typical characteristics of a chemical reaction

4 lines
97.

Adding quick lime to water it's an example of

a)

Combination or synthesis

b)

Exothermic

c)

Endothermic

d)

Displacement

98.

The reaction in which two or more substances ( reactants) combine to form a single substance ( product) is known as __________, and the reaction in which single substance ( reactant) decomposition to give simpler products is known as _______________, and the reaction in which heart is released is known as ________________.

a)

Combination, exothermic, decomposition

b)

Decomposition, combination, exothermic

c)

Combination, decomposition, exothermic

99.

What is the water of crystallisation of ferrous sulphate crystals

a)

7H2O

b)

3H2O

c)

H2O

100.

Rate of reaction reaction wiill increase with ___________ in temperature

a)

Increase

b)

Decrease

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