Description : Why carbon electrode is used during electrolysis of Nacl, instead of Pt electrode?
Last Answer : Ans: During electrolysis of Nacl, chlorine gas is produced at anode. Thus to avoid it’s reaction with platinum we use carbon electrode.
Description : Why for chromium plating iron is firstly platted by copper or nickel?
Last Answer : Ans: Because chromium metal doesn’t adhere directly to the iron properly so it is firstly plated with nickel or copper.
Description : What is electroplating and what is its objective?
Last Answer : Ans:The process in which one metal is deposited at other electrolytically. It is very useful process and following are objective of electroplating. (a) Deposition of Nobel metals on inferior metals. (b) Protection of different metals from corrosion. (c) Repair of broken machinery.
Description : How could we prevent H+ ions to be discharged first than Na+ during electrolysis of aqueous solution of NaCl?
Last Answer : Ans: This could be prevented by using mercury cathode during this kind of electrolysis, because H+ ions need high voltage to be discharged at mercury cathode. In this way sodium got discharged at cathode despite H+ ions.
Description : During electrolysis of aqeous solution of NaCl, there are two type of anions are present Cl- and –OH, Cl- is discharged first than –OH,although it is present below Cl- in electrochemical series. Give reason.
Last Answer : Ans: During this electrolysis process Chloride ions come from NaCl, which is a strong electrolyte and ionize to large extent so concentration of chloride ions in solution will be high. ... chloride ions it is first discharged despite of its presence above than hydroxyl in electrochemical series.
Description : Why cation present below in electrochemical series can discharge before the elements present above them in an electrochemical cell?
Last Answer : Ans: This is because their ability to be reduced (reduction potential) is more than the cation present above them in electrochemical series. So they take electrons before the other cations and get discharged.
Description : What is modern theory about the existence of the ionic compounds in solid state?
Last Answer : Ans: According to modern theory these exist in form of ions even in solid state for example, sodium chloride exist as Na+ Cl- . Whereas according to the ionic theory it exists as NaCl.
Description : Why sulphuric acid is added to the water during electrolysis of water?
Last Answer : Ans: It is added to increase conduction of the water, because water is a weak electrolyte.
Description : In Down’s cell, why the reaction between sodium metal and chlorine gas must be avoided? And how could we prevent reaction between them?
Last Answer : Ans:In Down’s cell electrolysis of fused NaCl yields sodium metal and chlorine gas .If these are not separated these will react to form Nacl again. So to prevent these reaction in Down’s cell, we place a steel gauze between cathode and anode.
Description : Why an electrolyte in molten or fused state is electrically neutral?
Last Answer : Ans: Because the number of + ve charges and –ve charges are equal , so as a result an electrolyte appears to be neutral in nature.
Description : Why ionic compounds are non conductor in solid state and conductor in molten or fused state?
Last Answer : Ans: This is because in solid state there are no free ions and their free movement isn’t possible but in molten or fused state the free movement of ions is possible, so these can conduct electric current.
Description : What is “redox” reaction?
Last Answer : Ans: “The reaction in which both reduction and oxidation takes place is called redox reaction. Reduction: “Addition of electron in an atom”. Oxidation: “Removal of electron from an atom”.
Description : What is difference between electrolytic and voltaic cell?
Last Answer : Ans:In electrolytic cell a non-spontaneous redox reaction is carried out with help of electrical energy. Wherease In voltaic cell a spontaneous redox reaction generates the electrical energy.
Description : In a magnetic material, always there exist magnetic dipoles as well as monopoles. State True/False. a) True b) False
Last Answer : b) False
Description : In a static magnetic field only magnetic dipoles exist. State True/False. a) True b) False
Last Answer : a) True
Description : Ionic non polar solid dielectrics contain more than one type of atoms but no permanent dipoles. State True/False a) True b) False
Description : Which metal is added to gold for making ornaments?
Last Answer : Copper
Description : Why is 6% to 8% copper added to gold in making ornaments?
Last Answer : Pure gold is very soft, it cannot be used to make artistic ornaments. To make it hard, improve the looks and colour, 6 to8% copper is added to ornamental gold.
Description : Gases which cause fading the colour of silver ornaments are?
Last Answer : Hydrogen Sulphide & Sulphur dioxide
Description : Is zakat obligatory if gold is less than seven and a half ounces ? My wife has 5 heavy gold ornaments which she uses for various occasions. Besides, there is no more money or resources. What will be his zakat ? He has no income. If you have to pay zakat, will you sell the jewelry and pay zakat ?
Last Answer : If your wife really does not have any other assets (such as cash , silver or business goods) other than 5 ounces of gold, then zakat will not be obligatory on you just because of that gold. Because zakat on ... ; Raddul Muhtar 2/296 ; Albahroor Rayek 2/228 , 2/228 ; Fatawa Tatarkhania 3/154 ; 263)
Description : Why do gold ornaments look new even after several years of use?
Last Answer : Gold does not corrode when exposed to atmosphere. It is a highly unreactive metal and is unaffected by air, water vapour and other gases in atmosphere.
Description : The compound of silicon used in making ornaments is
Last Answer : Zircon / Topaz.
Description : The “King of Metals” is : (1) Gold (2) Silver (3) Iron (4) Aluminium
Last Answer : (1) Gold Explanation: Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold ... most classic and coveted jewelry metal of all. It is also the oldest precious met-al known to man.
Description : Which of the following metals has least, melting point? (1) Gold (2) Silver (3) Mercury (4) Copper
Last Answer : (3) Mercury Explanation: The melting point of the given metals (in Celsius) are:- Gold: 1063; Silver: 961; Copper: 1083; Mercury: 38.86. Mercury is the only elemental metal known to melt at a generally cold temperature.
Description : Which is the heaviest metal among the following? (1) Gold (2) Silver (3) Iron (4) Copper
Last Answer : (1) Gold Explanation: The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682 ... .546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
Description : Among the following, which is always found in free-state in nature? (1) Gold (2) Silver (3) Sodium (4) Copper
Last Answer : (1) Gold Explanation: Gold is the least reactive in the reactivity series. Since it does not react with other elements, it is found in a free form. Only gold, silver, copper and the ... occur in nature in larger amounts. Nonmetallic elements occurring in the native state include carbon and sulfur.
Description : Chemically 'Quick Silver’ is known as (1) Mercury (2) Silver (3) Gold (4) Copper
Last Answer : (1) Mercury Explanation: Quicksilver is an alternative name for the element mercury. A heavy, silvery dblock element, mercury is the only metal that is liquid at standard conditions for temperature ... is bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature.
Description : Which of the following cannot be beaten into Sheets? (1) Gold (2) Silver (3) Potassium (4) Aluminium
Last Answer : (3) Potassium Explanation: Substances that can be beaten into thin sheets are called malleable. Most metals are malleable.
Description : Which of the following metals is least subject to oxidation? w) silver x) gold y) magnesium z) nickel
Last Answer : ANSWER: X -- GOLD
Description : Which of the following elements does not occur in nature as a native ore? w) silver x) gold y) platinum z) aluminum
Last Answer : ANSWER: Z -- ALUMINUM
Description : Which one of the following metals is immune to corrosion by air, water, hydrochloric acid and nitric acid; but is soluble in aqua regia? w) gold x) silver y) magnesium z) nickel
Last Answer : ANSWER: W -- GOLD
Description : A metal that does NOT occur native in the earth is w) copper x) gold y) sodium z) silver
Last Answer : ANSWER: Y -- SODIUM
Last Answer : Gold
Description : Which of the following metals has least melting point ? (1) Gold (2) Silver (3) Mercury (4) Copper
Last Answer : Mercury
Description : Chemically ‘Quick Silver is known as (1) Mercury (2) Silver (3) Gold (4) Copper
Description : How do you make your own Christmas ornaments?
Last Answer : When I was a kid, I went on a long kick making God’s Eyes. All you need is yarn and sticks, like popsicle sticks. It’s very satisfying. You can get really nice-looking results with just a little practice.
Description : Should you put ornaments on the Christmas tree with the lights on or with them off?
Last Answer : Lights typically go on first as it is easier to add the ornaments after. If you do the ornaments first, their little hooks make adding the lights a real challenge . . .
Description : What are some of the most annoying or ugly yard ornaments you've seen?
Last Answer : I’ll take a hundred random useless archways in exchange for one of those huge hideous inflated plastic snowmen, which are ugly enough and annoying enough for just a few weeks at Christmastime to fill my endurance quota for the entire year.
Description : What are your favorite old, new, and sentimental Christmas ornaments.
Last Answer : We have a set of glass bells that hang from the tree. A looong time ago when my son was about 4 I aimed a HeNe laser at one edge of one of the bells. I moved it so the angle of incidence ... going on. I taught him about lasers that year. He's now an electrical engineer. We still hang that ornament.
Description : How do you make these light ornaments/effect things with Yoplait cups?
Last Answer : Yes, it is just that easy
Description : Find old Hallmark ornaments?
Last Answer : Ebay. My mom had all but two of the Frosty Friends series, and I got her the two she needed a few years back. You’d be surprised how many people collect those.
Description : Any Christmas Ornaments Crafts Ideas?
Last Answer : answer:This year my kids and I are making cotton boll ornaments. We actually grew the cotton over the summer and are getting the supplies together to build them this weekend. It's pretty simple, just a red/green/ ... poms. I'll see if I can get you an image somehow to look at. They are really fun.
Description : How can I easily select a set symbol from an ornaments typeface?
Last Answer : Do you have ‘Keyboard Viewer’ in your keyboard menu? that shows you where they all are. (if you don’t already have it, go: Sys Prefs -> International -> Input Menu and select it)
Description : My dress is tranquil when I tread the earth, or dwell at home, or drift on the water. Sometimes my wings and this wide sky lift me over the dwellings of men, and then strong clouds carry me over ... , Illustriously sing when I am not near the earth and stream, a sailing spirit.What am I? -Riddles
Last Answer : A swan.
Description : Rhada has a 6-pound bag of clay. Her craft project requires 6 ounces of clay for each batch of 5 ornaments. If she uses all of the clay, how many ornaments can Rhada make Rhada can make ornaments?
Last Answer : it is 80( i just answered my own question)XD
Description : One who makes ornaments?
Last Answer : One who makes ornaments
Description : Explain in one word "the sound of ornaments" ?
Last Answer : The sound of rhetoric in one word.
Description : Are Ornaments Toxic?
Last Answer : Yes, because of cucurbitacin. This gene, from other pumpkins, was deleted by crossing and was therefore fit for human consumption.