Iron rusts at the area (a) Cathodic area (b) Anodic area (c) Both cathodic and anodic areas (d) None of the above

Iron rusts at the area (a) Cathodic area (b) Anodic area (c) Both cathodic and anodic areas (d) None of the above
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Galvanic corrosion cannot be prevented by (A) Cathodic protection (B) Anodic protection (C) Usage of largest possible anodic area (D) Any one of these

Description : Galvanic corrosion cannot be prevented by (A) Cathodic protection (B) Anodic protection (C) Usage of largest possible anodic area (D) Any one of these

Last Answer : Option B

Anodic material used for the cathodic protection of underground buried steel pipeline is (A) Nickel or copper (B) Zinc or magnesium (C) Bronze (D) Brass

Description : Anodic material used for the cathodic protection of underground buried steel pipeline is (A) Nickel or copper (B) Zinc or magnesium (C) Bronze (D) Brass

Last Answer : (B) Zinc or magnesium

When iron rusts, the weight (a) Increases (b) Decreases (c) Remains the same (d) First increases then decreases

Description : When iron rusts, the weight (a) Increases (b) Decreases (c) Remains the same (d) First increases then decreases

Last Answer : Ans:(a)

When Iron rusts; its weight?

Description : When Iron rusts; its weight?

Last Answer : increases

When Iron rusts; its weight?

Description : When Iron rusts; its weight?

Last Answer : Increases

Give reason: a) Iron exposed to air rusts quickly during rainy season.

Description : Give reason: a) Iron exposed to air rusts quickly during rainy season.

Last Answer : a) Iron exposed to air rusts quickly during rainy season. Due to the presence of excess water vapour. b) Iron nail kept in a closed jar containing calcium chloride does not rust. As air is dry ... ) Tin is used to coat the inner walls of brass and copper utensils. To avoid corrosion or rusting.

What is meant by ‘rusting’? With labelled diagrams, describe an activity to find out the conditions under which iron rusts. -Chemistry

Description : What is meant by ‘rusting’? With labelled diagrams, describe an activity to find out the conditions under which iron rusts. -Chemistry

Last Answer : When iron is exposed to air and moisture for a very long time, it gets covered with a brown flaky substance. This brown flaky substance is called rust and the process is called rusting. The ... when only oxygen was available, it shows that rusting cannot take place if only oxygen is available.

When iron rusts, how is its weight? -Do You Know?

Description : When iron rusts, how is its weight? -Do You Know?

Last Answer : answer:

Of the following processes in nature, which one involves only a physical change A. A bird digests a worm. B. Photosynthesis occurs in a leaf. C. An earthquake causes a rockslide. D. A chunk of iron ore rusts.?

Description : Of the following processes in nature, which one involves only a physical change A. A bird digests a worm. B. Photosynthesis occurs in a leaf. C. An earthquake causes a rockslide. D. A chunk of iron ore rusts.?

Last Answer : C: An Earthquake causes a rockslide

When iron rusts, how is its weight?

Description : When iron rusts, how is its weight?

Last Answer : – Increases

Iron rusts quickly in – (1) Rain water (2) Sea water (3) Distilled water (4) River water

Description : Iron rusts quickly in – (1) Rain water (2) Sea water (3) Distilled water (4) River water

Last Answer : (2) Sea water Explanation: Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions ... which causes the current to be re-versed and in effect the zinc corrodes rapidly, protecting the iron.

When iron rusts, its weight – (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Description : When iron rusts, its weight – (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Last Answer : (2) increases Explanation: When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase.

When iron rusts, its weight : (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Description : When iron rusts, its weight : (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Last Answer : (2) increases Explanation: When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water an the metal.

When iron rusts, its weight - (1) decreases (2) increases (3) Constant (4) None

Description : When iron rusts, its weight - (1) decreases (2) increases (3) Constant (4) None

Last Answer : (2) increases Explanation: Iron rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain.

Iron rusts quickly in

Description : Iron rusts quickly in

Last Answer : Sea water

A chemical change takes place when iron (A) Rusts (B) Melts (C) Is heated (D) None of these

Description : A chemical change takes place when iron (A) Rusts (B) Melts (C) Is heated (D) None of these

Last Answer : (A) Rusts

. Iron rusts quickly in

Description : . Iron rusts quickly in

Last Answer : Sea water

When iron rusts, its weight (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Description : When iron rusts, its weight (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

Last Answer : increases

Iron rusts quickly in (1) Rain water (2) Sea water (3) Distilled water (4) River water

Description : Iron rusts quickly in (1) Rain water (2) Sea water (3) Distilled water (4) River water

Last Answer : Sea water

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Description : Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Last Answer : (B) Oxidation of Cl - ions

Write any two examples of sacrificial anodic protection.

Description : Write any two examples of sacrificial anodic protection.

Last Answer : Examples: 1) To protect buried water or gas pipelines. 2) To protect buried cables. 3) To protect hot water tank, etc. 4) Mg or Zn rods are bolted along the sides of ship, hot water ... protect open water box coolers. 6) To protect water tanks. 7) To protect transmission line towers, etc. 

Describe sacrificial anodic protection with neat diagram.

Description : Describe sacrificial anodic protection with neat diagram.

Last Answer : Method: The metallic structure to be protected from corrosion is connected to anodic metal (upper placed in galvanic series) by an insulated wire. Thus externally added metal like Zn, Al, Mg, etc ... hot water tanks to prevent corrosion. The protection of underground pipelines is shown in Fig.

Galvanising (i.e., zinc coating) of steel sheets is done to (A) Prevent its rusting by contact with corrosive atmosphere (B) Protect the base metal by cathodic protection (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Galvanising (i.e., zinc coating) of steel sheets is done to (A) Prevent its rusting by contact with corrosive atmosphere (B) Protect the base metal by cathodic protection (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

On a PlayStation 3 hooked up to a cathodic television, is there any way to be able to read text better?

Description : On a PlayStation 3 hooked up to a cathodic television, is there any way to be able to read text better?

Last Answer : No, tube TV’s arent designed for modern graphics. Buy a better TV, or if you have white walls, buy a cheap projector and hook that up.

The schematic diagram shown in the illustration represents which of the listed solid-state circuits? EL-0069 A. Bridge rectifier B. Magnetic amplifier C. Flip-flop generator D. Cathodic amplifier

Description : The schematic diagram shown in the illustration represents which of the listed solid-state circuits? EL-0069 A. Bridge rectifier B. Magnetic amplifier C. Flip-flop generator D. Cathodic amplifier

Last Answer : Answer: A

The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Description : The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Last Answer : Answer: D

Impressed current cathodic protection is used on vessels instead of _________________. A. fire alarm systems B. repeated painting C. sacrificial zincs D. vacuum tube degaussing systems

Description : Impressed current cathodic protection is used on vessels instead of _________________. A. fire alarm systems B. repeated painting C. sacrificial zincs D. vacuum tube degaussing systems

Last Answer : Answer: C

In an impressed current cathodic protection system, the anode is ____________. A. connected to the hull and deteriorates with time B. insulated from the hull and does not waste away C. connected to the hull but does not waste away D. insulated from the hull but deteriorates with time

Description : In an impressed current cathodic protection system, the anode is ____________. A. connected to the hull and deteriorates with time B. insulated from the hull and does not waste away C. connected to the hull but does not waste away D. insulated from the hull but deteriorates with time

Last Answer : Answer: B

The amount of current flow required for the cathodic protection of a vessel is dependent upon the _________. A. amount of bare steel surface B. speed of the ship through the water C. temperature of the water D. all of the above

Description : The amount of current flow required for the cathodic protection of a vessel is dependent upon the _________. A. amount of bare steel surface B. speed of the ship through the water C. temperature of the water D. all of the above

Last Answer : Answer: D

The purpose of an impressed current cathodic protection system aboard ship is to _______________. A. prevent corrosion of the hull, propeller, rudder and line shafting B. neutralize the vessel's stray magnetic fields which would interfere with radar C. protect engine room and deck machinery from oxidation in the presence of salt air D. maintain a minimum constant alternator load to prevent overheating

Description : The purpose of an impressed current cathodic protection system aboard ship is to _______________. A. prevent corrosion of the hull, propeller, rudder and line shafting B. neutralize the vessel's ... the presence of salt air D. maintain a minimum constant alternator load to prevent overheating

Last Answer : Answer: A

The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Description : The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Last Answer : Answer: D

Lead is (A) Not resistant to corrosion (B) Used as a cathodic material (C) Not used as pigment (in its compound forms) for paints (D) Used as a shock absorber (in mattress form) between the foundation and steel framework of skyscraper buildings

Description : Lead is (A) Not resistant to corrosion (B) Used as a cathodic material (C) Not used as pigment (in its compound forms) for paints (D) Used as a shock absorber (in mattress form) between the foundation and steel framework of skyscraper buildings

Last Answer : (D) Used as a shock absorber (in mattress form) between the foundation and steel framework of skyscraper buildings

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode (A) Occurs higher in the electro-chemical series of metals (B) Is exemplified by magnesium plate (C) Is much cheaper than the cathodic base material to be guarded against corrosion (D) All (A), (B) & (C)

Description : Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode (A) Occurs higher in the electro-chemical series of metals (B) Is exemplified by magnesium plate (C) ... cathodic base material to be guarded against corrosion (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Explain cathodic protection. Give one example.

Description : Explain cathodic protection. Give one example.

Last Answer : Cathodic protection: It is the method in which the metal to be protected is forced to behave as a cathode. Examples: 1) To protect buried water or gas pipelines. 2) To protect buried cables. 3) ... water box coolers. 6) To protect water tanks. 7) To protect transmission line towers, etc.  

Often held but never touched, always wet but never rusts, often bites but seldom bit, to use me well you must have wit.What am I? -Riddles

Description : Often held but never touched, always wet but never rusts, often bites but seldom bit, to use me well you must have wit.What am I? -Riddles

Last Answer : Your tongue.

Is the body of a trucks rusts a physical or a chemical property?

Description : Is the body of a trucks rusts a physical or a chemical property?

Last Answer : Feel Free to Answer

What rusts metal?

Description : What rusts metal?

Last Answer : Oxygen is a corrosive element that rusts metal.

Is rusts physical change or chemical change?

Description : Is rusts physical change or chemical change?

Last Answer : Its is chemical as

Silencing of mRNA has been used in producing transgenic plants resistant to (a) boll worms (b) nematodes (c) white rusts (d) bacterial blights.

Description : Silencing of mRNA has been used in producing transgenic plants resistant to (a) boll worms (b) nematodes (c) white rusts (d) bacterial blights.

Last Answer : (b) nematodes

Which iron and steel industry of India is located away from the main coal areas ? What is the main source of energy in the absence of coal ? -Geography

Description : Which iron and steel industry of India is located away from the main coal areas ? What is the main source of energy in the absence of coal ? -Geography

Last Answer : Visveswaraya Iron and Steel Limited is located away from the main coal areas. Its main source of energy earlier was charcoal but now it uses Hydroelectric Power from Mahatma Gandhi and Sharavati Hydroelectric power station.

Explain why rusting of iron objects is faster in coastal areas than in deserts. -Science-7

Description : Explain why rusting of iron objects is faster in coastal areas than in deserts. -Science-7

Last Answer : As content of moisture in the air in coastal areas is higher than in the air in deserts. So, the process of rusting is faster in coastal areas.

What other areas of the world were threatened by Communism at the time of iron curtain?

Description : What other areas of the world were threatened by Communism at the time of iron curtain?

Last Answer : Southeast Asia and that is one reason the Vietnam War tookplace.

Match the following: Minerals Areas A. Gold 1. Khetri B. Coal 2. Kolar C. Copper 3. Kudremukh D. Iron 4. Jharia A B C D (a) 2 4 1 3 (b) 1 2 3 4 (c) 4 3 2 1 (d) 3 4 1 2

Description : Match the following: Minerals Areas A. Gold 1. Khetri B. Coal 2. Kolar C. Copper 3. Kudremukh D. Iron 4. Jharia A B C D (a) 2 4 1 3 (b) 1 2 3 4 (c) 4 3 2 1 (d) 3 4 1 2

Last Answer : Ans: (a)

The following are true: a. depth of perception only occurs in patients with normal visual acuities in both eye b. Hering's law states that increased innervation to an extraocular muscle is accompanied by a decrease in innervation to its antagonists. c. objects on the Panum's area fall on simultaneous areas of the retina d. objects outside of the Panum's area are perceived as doubl

Description : The following are true: a. depth of perception only occurs in patients with normal visual acuities in both eye b. Hering's law states that increased innervation to an extraocular muscle is ... simultaneous areas of the retina d. objects outside of the Panum's area are perceived as doubl

Last Answer : objects outside of the Panum's area are perceived as doubl