We believes the value of brand, which originates from not only excellent products and solutions, but also considerate pre-sales & after-sales technical services. After the sales, we will also have a 24-hour online after-sales service team to serve you. please be relief, Our service will make you satisfied.Inquiry Online
Isolation of elements in Chemistry class 12 aims to teach the students about various processes of extraction of metals from ores. Very few metals such as the noble metals, i.e., Gold, Silver, and Platinum etc. are present in their original metallic forms in nature.
Metals like iron, silver and copper get corroded on exposure to air. Write the chemical name of the substance deposited on their surface respectively with its colour, in each case. Question 22 a Define the term alloy. Write two advantages of making alloys.
2011-2-14Write the name and t7wmula of three important ores of each Copper antl Iron. In comparison to H.O. H.,S is strong reducing agent. Why Give any three main ... Write names of three copper alloys, composition and their uses. ... Write down two
2015-9-23The discovery of copper in 5,000 BC marked the end of the Stone Age and the beginning of the Copper Age. The later invention of bronze , an alloy of copper and tin, started the Bronze Age. The use of ferrous metals started in around 1,200 BC when iron production started to become commonplace.
2020-8-15Examples of abiotic natural resources are water, land, air and heavy metals like iron, copper, silver, gold, and so on. Stock Natural Resources Stock natural resources are those that are present in the environment but t the necessary expertise or technology to have them exploited. Hydrogen is an example of a stock natural resource.
32.Write the names and symbols of two most reactive metals. Explain by drawing electronic structure how any one of the two metals react with a halogen. State any four physical properties of the compound formed. Answer. KPotassium and NaSodium are the two most reactive metals. K and Na are electronic structures as they have one valence ...
2020-8-16A metal X acquires a green colour coating on its surface on exposure to air. i Identify the metal X and name the process responsible for this change. ii Name and write chemical formula of the green coating formed on the metal. iii List two important methods to prevent the process. CBSE 2012
2007-7-16proton and a neutron and Tritium a protron and two neutrons. Hydrogen is the only element whose isotopes have been given different names. Deuterium and Tritium are both used as fuel in nuclear fusion reactors. One atom of Deuterium is found in about 6000 ordinary hydrogen atoms. Deuterium is used as a moderator to slow down neutrons.
2020-8-13i Poling This method is used when the impure metal contains impurities of Its own oxide, e.g., CU 2 O in blister copper and SnO 2 in impure Sn. The molten impure metal is stirred with green wood poles. At this high temperature. wood liberates gases such as CH 4 which reduces any oxides present in the metal. ii Electro-refining
2011-3-1Write the name and t7wmula of three important ores of each Copper antl Iron. In comparison to H.O. H.,S is strong reducing agent. Why Give any three main What Qintersritial compounds o transition elements Write properties interstitial compounds with two suitable examples, Or Whv are transition elementsAY1rt11nagnetic
2020-8-9Write down the symbols of the ions you would expect to be formed from their atoms. Solution X will form X 2-Y will form Y 2 Question 8 a Write down the electronic configuration of i magnesium atom, and iimagnesium ion. At. No. of Mg 12 b Write down the electronic configuration of i sulphur atom, and ii sulphide ion. At. No ...
Copper is an essential mineral that plays a key role in many physiological processes, including angiogenesis, skin generation and expression and stabilization of skin proteins. Copper is found naturally in many food sources including meats, vegetables, and grains. Copper has potent biocidal properties and is used to eliminate bacteria, viruses and parasites L1828, L1839.
Some common ores include galena lead ore, bornite and malachite copper, cinnabar mercury, and bauxite aluminum. The most common iron ores are magnetite and hematite a rusty-colored mineral formed by iron and oxygen, which both contain about 70 iron. There are several processes for refining iron from ore. The older process is to burn ...
2017-10-14Porphyry - Any igneous rock in which relatively large crystals , called phenocrysts, are set in a fine-grained groundmass. Porphyry copper - A deposit of disseminated copper minerals in or around a large body of intrusive rock. Portal - The surface entrance to a tunnel or adit. Portfolio -
Copyright © 2020 Mining Machinery Company All rights reserved