What is used as a photocatalyst?
a) Titanium dioxide
b) Lead chromate
c) Cobalt pigments
d) Iron oxide

1 Answer

Answer :

a) Titanium dioxide

Related questions

Description : Name two important ores of iron? Mention its formula.

Last Answer : Name two important ores of iron? Mention its formula.

Description : Which of the following oxides is not present in hematite iron ore? (A) Titanium oxide (B) Calcium oxide (C) Cobalt oxide (D) Manganese oxide

Last Answer : (C) Cobalt oxide

Description : Which oxide of the following metals is often used as a pigment in white paint? w) titanium x) cobalt y) nickel z) vanadium

Last Answer : ANSWER: W -- TITANIUM

Description : Which raw material is used to impart colour to the glass? a) Al2O3 b) CoO c) CaO d) MgO

Last Answer : b) CoO

Description : Suggest the type of lubricant used for the following jobs: i) Clock ii) I.C. Engines iii) Gears iv) Sewing machine

Last Answer : i) Clock : Vegetable and animal oils like palm oil, hazel nut oil, neat foot oil, etc ii) I.C. Engines: Mineral oils containing additives are used. iii) Gears: Thick mineral oils containing ... Mineral oil, silicones, thin vegetable and animal oils like palm oil, hazel nut oil, neat foot oil.

Description : Explain boundary lubrication with diagram.

Last Answer : Boundary lubrication: This type of lubrication is done when a continuous fluid film of lubricant cannot persist & direct metal to metal contact is possible due to certain reasons. This happens when i) a ... which is responsible for this kind of adsorption is Oiliness.   Diagram 

Description : Define lubricant. Give the classification of lubricants with at least one example of each type.

Last Answer : Lubricant: Any substance introduced between two moving or sliding surface to reduce the frictional resistance between them is known as lubricant. Classification: i) Solid lubricants: Examples: graphite, ... acids like oleic acid, Stearic acid etc., silicones, blended oils, and mineral oils.

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.

Description : Name and describe the method used for coating large and irregularly shaped articles for prevention of corrosion.

Last Answer : Metal spraying is the method used for coating large and irregularly shaped articles for prevention of corrosion. Diagram: Process:- In this method ,coating metal sprayed on the surface of ... . The molten metal then sprayed on the surface of base metal with the help of compressed air.

Description : Explain the mechanism of oxidation corrosion

Last Answer : The electrons are transferred from metal atom to oxygen. Metal loses electron while oxygen accepts electron forms their respective ions these two types of ion combine together to from metal oxide. 

Description : Write composition, 2 properties and two uses of CNG.

Last Answer : Properties: - 1) It is cheaper than petrol or diesel. 2) Its ignition temp is high (5400C). 3) It is odorless & non corrosive. 4) It is light weight gas. 5) ... petrol / CNG) 2) It is also used in locomotive generators to generate electricity that drives the motors of the train.

Description : Explain the significance of proximate analysis. 

Last Answer : Significance: Proximate analysis provides following valuable information in assessing the quality of fuel i) Moisture: - Lesser the moisture better is the quality of coal. ii) Volatile Matter: - Lower / ... iv) Fixed Carbon: - Higher the percentage of fixed carbon, greater is the calorific value.

Description : Define fuel. Give the classification of fuel based on their occurrence with two examples of each type.

Last Answer : Fuel: A fuel can be defined as any combustible substance which during combustion gives large amount of heat energy.  Classification of Fuel : I) Primary or Natural Physical State i) Solid - e.g wood ... diesel oil, lubricating oil iii)Gaseous- e.g LPG, water gas ,producer gas ,coal gas, biogas

Description : Distinguish between hardening and normalising.

Last Answer : Hardening Normalizing 1. It is the process of heating steel at high temperature (800-9000C) and then suddenly cooled by dipping or quenching in some suitable medium. 1. It is the ... hardening. 6. It creates stresses in structure 6. It removes coarser grained structure.

Description : Give the classification of plain carbon steel. Write composition, one property and one use of different plain carbon steel.

Last Answer : Classification: a) Mild or low carbon steel - 0.05 to 0.3% carbon b) Medium carbon steel - 0.3 to 0.6% carbon c) High carbon steel - 0.6 to 1.5% carbon ... Wooden working tools, chisels, saws, drills, metal cutting tools for lathes, cutters, knives, blades, razors etc.

Description : Write chemical reactions taking place in zone of reduction of blast furnace.

Last Answer : Write chemical reactions taking place in zone of reduction of blast furnace.

Description : Define cloud point and viscosity index of a lubricant

Last Answer : Cloud point: Cloud point indicates the temperature at which the oil becomes cloudy in appearance, due to separation of wax. Viscosity Index: The rate of change of viscosity of a liquid (Oil) with the change of temperature is known as viscosity index.

Description : Distinguish between solid fuel and liquid fuel.

Last Answer : Property Solid Liquid 1.Calorific Value Low Higher 2.Ignition Temperature  Very high Moderate 3.Cost  Cheap Costly 4.Ash content High Negligible 5.Velocity of combustion Non controllable Easily Controllable

Description : Give two applications of biodiesel.

Last Answer : 1) It is an alternative fuel formulated exclusively for diesel engines with little or no modification in engines. 2) It is also used as a heating fuel in domestic & commercial boilers. 3) It is used in rockets.

Description : Define calorific value & ignition temperature 

Last Answer : Calorific value: - It is defined as “the total amount of heat produced by the complete combustion of unit mass or unit volume of the fuel.” Ignition temperature:-It is the minimum temperature at which combustion of a fuel takes place when the firing is once started.

Description : List any four constituents of paint. 

Last Answer : 1) Pigments 2) Drying Oil / Medium 3) Thinners 4) Driers5) Extenders 6) Plasticizers

Description : Define Cementation. Name its types.

Last Answer : Cementation: It is the process of heating the base metal in a revolving drum containing a powder of coating metal. Types: i) Sherardizing ii) Chromizing iii) Colorizing

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 : What is the effect of alloying element Cr & V on the properties of steel?

Last Answer : Effect of alloying element Cr:- i) It increases hardness, toughness and tensile strength. ii) It increases wear resistance and resistance to corrosion. Effect of alloying element V:  ... tensile strength, ductility and shock resistance. ii) It increases air hardening and cutting quality.

Description : Define heat treatment. Give any two purposes of heat treatment.

Last Answer : Heat treatment:- The process of heating steel to a certain high temperature and then cooling it at a controlled rate in order to develop certain physical properties without changing its chemical composition ... 7) To remove trapped gases. 8) To improve machinability and mechanical properties.

Description : State any two functions of Blast furnace.

Last Answer : 1. To reduce the ore to metallic. 2. To remove the impurities in the form of slag.

Description : For given applied voltage, with the increase in frequency of the applied voltage?

Last Answer : For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

Description : What is the formula for cobalt (iii) chromate?

Last Answer : The formula for cobalt(III) chromate is Co2(CrO4)3.

Description : Which of the following imparts a blue colour to glass? (1) Cobalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Last Answer : (1) Cobalt oxide Explanation: The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of ... colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.

Description : Adding which substance gives blue colour to glass? (1) Manganese oxide (2) Cobalt oxide (3) Chromium oxide (4) Iron oxide

Last Answer : (2) Cobalt oxide Explanation: Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.

Description : Which of the following is an yellow pigment? (A) Titanium dioxide (B) Ferrous sulphate (C) Lead chromates (D) Zinc sulphides

Last Answer : (C) Lead chromates

Description : Paint Zinc chromate Red oxide primer confirms to IS

Last Answer : 2074

Description : In areas where there is severe corrosion Finishing coat will be a) Two coats of aluminium paint to IS : 2339* b) One coat of zinc chromate priming to IS : 104 e) Two cover coats of red oxide paint to IS :123 f) One coat of zinc chrome - red oxide priming to IS : 2074

Last Answer : a) Two coats of aluminium paint to IS : 2339*

Description : In areas where there is no severe corrosion Finishing coat will be a) Two coats of aluminium paint to IS : 2339 b) One coat of zinc chromate priming to IS : 104 c) Two cover coats of red oxide paint to IS :123* d) One coat of zinc chrome - red oxide priming to IS : 2074

Last Answer : c) Two cover coats of red oxide paint to IS :123*

Description : What is the trade name of lead chromate ?

Last Answer : The trade name for lead chromate is chrome yellow.

Description : Which of the substances listed should be applied to battery terminals to help prevent corrosion? A. Zinc chromate B. Naval jelly C. Lead peroxide D. Petroleum jelly

Last Answer : Answer: D

Description : The commonly used base for iron and steel work, is (A) Red lead (B) Zinc white (C) White lead (D) Titanium white

Last Answer : Answer: Option A

Description : The cathode of a lead storage battery is made up of – (1) Zinc (2) Lead (3) Lead oxide (4) Manganese dioxide

Last Answer : (2) Lead Explanation: Lead-acid batteries, invented in 1859 by French physicist Gaston Plante, are the oldest type of rechargeable battery. Despite having a very low energy-to-weight ratio ... attractive for use in motor vehicles to provide the high current required by automobile starter motors.

Description : The cathode of a lead storage battery is made up of (1) Zinc (2) Lead (3) Lead oxide (4) Manganese dioxide

Last Answer : Lead

Description : Which of the following materials are used in the manufacture of pig iron from iron ore? w) Limestone and carbon x) Calcium oxide and oxygen y) Chromium and nickel z) Oxygen and sulfur dioxide

Last Answer : ANSWER: W -- LIMESTONE AND CARBON

Description : Which of the following imparts deep blue colour to glass? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : (4) Nickel oxide Explanation: Glass colouring and colour marking may be obtained by addition of colouring ions, by precipitation of nanometer sized colloides (so-called striking glasses such as "ruby gold" or red "selenium ruby"), by coloured inclusions (as in milk glass and smoked glass).

Description : Which of the following imparts deep blue colour to glass ? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : Nickel oxide

Description : Zinc is not used (A) For producing zinc base die casting alloys (B) In its oxide form as pigments (C) As anode for corrosion prevention in boiler (D) As an alloying element in various bronzes

Last Answer : (D) As an alloying element in various bronzes

Description : Both rubies and sapphires contain (a) silicon dioxide (b) lead tetroxide (c) aluminium oxide (d) boron nitride

Last Answer : Ans:(c)

Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3

Description : Is titanium dioxide ionic or covalent?

Last Answer : Need answer

Description : Titanium dioxide is a/an __________ colour pigment. (A) White (B) Black (C) Yellow (D) Blue

Last Answer : (A) White

Description : During smelting process, the combination of fuel in the furnace (A) Forms carbon dioxide (B) Carbon dioxide with carbon forms carbon mono-oxide (C) Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2 (D) All the above

Last Answer : Answer: Option D

Description : Generally metallic oxides are basic and non-metallic are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red? a)sulphur dioxide b)Magnesium oxide c)iron oxide d)copper oxide

Last Answer : a)sulphur dioxide

Last Answer : : The signal of lithium cobalt oxide is LiCoO2