Description : The deterioration of a metal by an electrochemical process is commonly termed as (1) Erosion (2) Corrosion (3) Passivation (4) Abrasion
Last Answer : Corrosion
Description : In connection with corrosion of metals, passivation is the process that (A) Intensifies deterioration (B) Changes the composition of the metal (C) Inhibits further deterioration (D) None of these
Last Answer : (C) Inhibits further deterioration
Description : Electrochemical corrosion can occur, only if __________ is present in contact with metal. (A) Air (B) Oxygen (C) Liquid medium (D) Gaseous medium
Last Answer : (C) Liquid medium
Description : The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactions occurring during the corrosion of iron in the atmosphere. -Chemistry
Last Answer : The mechanism of corrosion is explained on the basis of electrochemical theory. By taking example of rusting of iron, we Refer tothe formation of small electrochemical cells on the surface of iron. The redox reaction involves ... net resultant Redox reaction is 2Fe(s) + O2 (g) + 4H+ → 2Fe2+ + 2H2O
Description : Name any four factors affecting electrochemical corrosion.
Last Answer : A) Nature of metal: 1) Position of metal in a galvanic series: A metal having higher position in a galvanic series has more chemical reactivity and therefore, it gets attacked by gaseous and ... as a conducting medium and promotes corrosion. e.g:- Rusting of Fe is promoted in humid atmosphere.
Description : The damage/deterioration of metals by the __________ action of fluids is called 'erosion'. (A) Abrasive (B) Corrosive (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (A) Abrasive
Description : Excessive camber on pavements may cause (A) Deterioration of central portion (B) Slip of the speedy vehicles towards the edges (C) Erosion of the berms (D) All the above
Last Answer : Answer: Option D
Description : Presence of manganese in alloy steel improves its (A) Corrosion resistance (B) Cutting ability (C) Abrasion resistance & toughness (D) Elasticity & creep resistance
Last Answer : (C) Abrasion resistance & toughness
Description : Alloys having more than 80% copper are generally more (A) Abrasion resistant (B) Corrosion resistant (C) Prone to season cracking (D) Machinable
Last Answer : (B) Corrosion resistant
Description : Corrosion involves exchange of electrons in __________ corrosion. (A) Chemical (B) Electrochemical (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its (A) Lower cost (B) Abundant availability (C) Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry (D) None of these
Last Answer : (C) Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
Description : Define electrochemical corrosion.
Last Answer : Electrochemical corrosion:- The corrosion which is brought about through ionic reactions in the presence of moisture or solution as a conducting medium when two dissimilar metals are in contact with each other is called electro chemical corrosion.
Description : Damage to metal surface by mechanical action is called (A) Pitting (B) Corrosion (C) Erosion (D) None of these
Last Answer : Option C
Description : The formation of 'Mushroom rock' in desert region is an example of – (1) Deflation (2) Attrition (3) Abrasion (4) Erosion
Last Answer : (3) Abrasion Explanation: The rocks having broad upper part and narrow base resembling an umbrella or mushroom are called mushroom rocks or pedestal rocks. These undercut, mushroomshaped rocks are formed due to abrasive works of wind.
Description : The size of the pulp chamber within the tooth is influenced by: A. Age B. Parafunctional C. History of the tooth /abrasion, erosion, caries/ D. All of the above
Last Answer : D. All of the above
Description : The formation of ‘Mushroom rock’ in desert region is an example of (1) Deflation (2) Attrition (3) Abrasion (4) Erosion
Last Answer : Abrasion
Description : Close inspection of a failed metal part reveals artifacts on the fracture surface commonly referred to as "striations" or "beach marks". This indicates the component failed as a result of: w) Sudden overloading x) Cyclical loading y) Stress corrosion cracking z) None of the above
Last Answer : ANSWER: X -- CYCLICAL LOADING
Description : How important is it to do process of passivation?
Last Answer : In some industries passivation is extremely important. This process can remove impurities in indsutrial containers that hold volatile chemicals. If the impurities were to stay there, then the chemicals could be rendered useless or even react violently.
Description : In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as: A. Electroplating B. Annealing C. Galvanization D. Vulcanization
Last Answer : ANSWER: C
Description : In order to prevent the corrosion of iron pipes, they are often coated with a layer of zinc. This process is termed as (a) electroplating (b) annealing (c) galvanization (d) vulcanization
Last Answer : Ans:(c)
Description : In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as------? A. Electroplating B. Annealing C. Galvanization (Answer) D. Vulcanization
Last Answer : C. Galvanization (Answer)
Description : What is the definition of the word "passivation"?
Last Answer : Passivation is defined as the process to make a material "passive" in its relation to another material before the materials are used together.
Description : What is passivation?
Last Answer : Passivation includes making one material passive in relation to another before using them together. It is used with such materials as aluminum, iron, stainless steel, and copper.
Description : Widening of a river valley takes place due to – (1) Corrosion (2) Lateral erosion (3) Corrasion (4) Hydraulic action
Last Answer : (2) Lateral erosion Explanation: Lateral or sideways erosion widens the river valley; while, Vertical or downward erosion deepens the river valley. Due to continued lateral erosion, the river ... slopes are also eroded by weathering and mass wasting and by the development of tributary valleys.
Description : The sideways erosion which widens the river valley called? (1) Lateral Corrosion (2) Vertical Corrosion (3) Side Corrosion (4) Mean Corrosion
Last Answer : (1) Lateral Corrosion Explanation: Sideways form of erosion is called lateral erosion. In lateral erosion, the river erodes away at its banks and widens the river channel. Together, vertical and lateral erosion create the distinctive V-shaped valley that is found in rivers in their upper course.
Description : In a furnace employing forced draught as compared to induced draught, (A) Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced (B) The fan operates hot and hence blades are liable to corrosion and erosion (C) Positive pressure exists in the furnace (D) None of these
Last Answer : (C) Positive pressure exists in the furnace
Description : Corrosion is (A) A physical phenomenon (B) A chemical phenomenon (C) Same as erosion (D) An uncontrollable phenomenon
Last Answer : Option B
Description : Widening of a river valley takes place due to (1) Corrosion (2) Lateral erosion (3) Corrasion (4) Hydraulic action
Last Answer : Lateral erosion
Description : Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) ... its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature
Last Answer : (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal
Description : Electrometallurgical methods of metal extraction is normally used for those metals (A) Whose oxide/ore is not reduced by carbon (B) Which fall in the category of alkali & alkaline earth metals (C) Which stands higher in the electrochemical series of the metal (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Periodic testing by a shoreside support technician using a special camera which can detect potentially dangerous loose or corroded bus bar and controller connections is termed ______________. A. heat sensitive thermography B. visual pyrotronics C. corrosion electrolysis D. electric vibroanalysis
Last Answer : Answer: A
Description : The process of deriving conclusions from the analysis is commonly termed as ---------------- a) Analysis b) Conclusion c) Comparison d) Interpretation
Last Answer : d) Interpretation
Description : Pick out the wrong statement about coating/electroplating of metals. (A) Phosphate coating is used as an excellent base for paints & enamels (B) Phosphate coating is less corrosion resistant than ... coating metal is made the anode (D) Calorising is the process of coating steel with chromium
Last Answer : (D) Calorising is the process of coating steel with chromium
Description : Describe metal spraying process for protection of metal from corrosion .Write its two applications.
Last Answer : Process:- i) In this method, coating metal sprayed on the surface of base metal with the help of spraying gun or pistol. ii) The spraying gun consist of a duct for compressed air and is fitted with the oxy- ... 4) Coating of metals like Al, Zn, Ni, Sn, Pb etc. is made by the method of spraying.
Description : Why acid causes corrosion of metal ?
Last Answer : We heard about acid. I know it dissolves other solids. Many times some professional thieves melt the lock with acid without breaking the lock for theft. So how did the acid get such horrible properties ... in a piece of metal decreases. This is why exposure to acid actually causes metal to decay.
Description : Which metal does not undergo corrosion due to the formation of oxide layer? (1) Copper (2) Iron (3) Aluminium (4) Zinc
Last Answer : Aluminium
Description : What is the process that tends to build up the land surface by deposition of solid material in its lower areas, known as? a. Abrasion b. Agglomeration c. Aggradation d. Attrition
Last Answer : c. Aggradation
Description : In the commercial electrochemical process for aluminium extraction, the electrolyte used is
Last Answer : In the commercial electrochemical process for aluminium extraction, the electrolyte used is A. `Al(OH)_(3)`in NaOH ... of AlO (OH) and `Al(OH)_(3)`
Last Answer : In the commercial electrochemical process for aluminium extraction, the electrolyte used is A. `Al(OH)_(2)` is NaOH ... Al_(2)O_(3)` and `Al(OH)_(3)`
Description : Electrochemical process (electrolysis of fused salt) is empolyed to extract
Last Answer : Electrochemical process (electrolysis of fused salt) is empolyed to extract A. Iron B. Mg C. Na D. Both Na and Mg
Description : Alloy powder manufactured by the following process have spherical shapes. (A) Electrochemical deposition (B) Gaseous reduction (C) Atomisation (D) Mechanical attrition
Last Answer : (C) Atomisation
Description : Using the electrochemical series, how can I explain why manufacturers coat steel nails with zinc rather than copper?
Last Answer : Because the use of zinc is…......... Nah you do the work , or its called cheating :P
Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e- ... the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry
Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → = Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V At cathode (reduction) : MnO-4(aq) + 8H+ ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.
Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + ... -reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry
Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V Af cathode (reduction) : MnO-4(aq) + 8H+ ( ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.
Description : What is Electrochemical Equivalence ?
Last Answer : One ampere conducts an electric current for one second, that is , one coulomb conducts an electric current.
Description : What is Electrochemical Cell ?
Last Answer : Electrochemical cell is a type of cell through which electricity can be generated from chemical energy.
Description : n electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a – (1) Power transmittor (2) Battery (3) Uninterrupted power supply (UPS) (4) Generator
Last Answer : (3) Uninterrupted power supply (UPS) Explanation: A Galvanic cell, also known as battery, is an electro-chemical cell that derives electrical energy from spontaneous redox reactions taking place within ... produce direct current. A battery is a set of galvanic cells that are connected in parallel.
Description : The rusting of iron is a/an - (1) physical change (2) electrochemical change (3) electrical change (4) None of the above
Last Answer : (2) electrochemical change Explanation: When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
Description : What would happen if salt bridge is not used in electrochemical cell ?
Last Answer : Ans. :- The cell works for short time .After that electrons stop flowing from anode to cathode due to accumulation of +ve ions at anode and no reduction will occur at cathode . The result is that current stops flowing and cell will not work .
Description : What is meant by Electrochemical cell . Why is it called as galvanic cell and Voltaic cell ?
Last Answer : Ans. :- The cell which converts chemical energy into electrical energy . It is called as galvanic cell and Voltaic cell after the name of scientists who first tried to convert chemical energy into electrical energy .