Why was HCl added for the flame test of barium?

Q: What is the role of sodium hydroxide in Azo dye compound ?

A: The role of sodium hydroxide in azo dye compound has to be given.

Q: How is lead ion separated and identified in group 1 cation analysis?

A: Qualitative analysis of Lead ion (Pb2+) ; In group I cation analysis, the presence of Pb2+ is…

Q: Why is the froth flotation method selected for the concentration of sulphide ores?

A: Froth floatation process: This process helps to remove gangue from sulphide ores. The principle…

Q: Calculate the volume of 0.0477 M EDTA needed to titrate the Ca in a 0.1715 g CaCO, (MM = 100.0869…

A: Ca2+ forms a 1:1 complex with EDTA  Zn2+ also forms a 1:1 complex with EDTA  So, 1 mole of Ca2+ or 1…

Q: What should be color of your solution before the end point in the determination of magnesium using…

A: Befor the end point the solution should be a wine red color. Direct-titrate the solution with…

Q: How is lake test for aluminium ion based upon adsorption?

A: The lake test for aluminium ion is done based upon adsorption by litmus paper testing. Al2O3.nH2O…

Q: What are the formula, molar mass, and color of potassium permanganate and specify the source used?

A: A chemical formula is the representation of chemical compound showing chemical proportions of each…

Q: What is the major solid product resulting from the removal of SO2 from furnace gas?

A: The SO2 and SO3 gases from the furnace are not directly released into the atmosphere because S and…

Q: Preparation for the copper (1)chloride Does the colour of the CuCl remain the same if you leave it…

A:

Q: Why a FGD wet scrubber can remove oxidized mercury, but not much of the elemental mercury?

A: FGD stands for Flue Gas Desulfurization During the combustion of coal in power plants, the amount of…

Q: What is responsible for the purple color of the layer observed in a Molisch test?

A: Molisch test is a test which is used to check for carbohydrates in a given sample.  In it, Molish…

Q: what is the aqueous NH3 test used for in the copper cycle experiment?

A: 1) To small drop of the solution and add it to some concentrated ammonia in a beaker or test tube.…

Q: what is the pH of bleach with [H3O+]=4.2*10-12 M

A:

Q: i) ii) Which metals is classified as a Group 2 cations? What is the selective reagent for Group 2…

A: In this question, we have to find out the correct answer of given problem by the help of the…

Q: If 22.29 mL of 0.02901 M EDTA is required to tirate 100.0 mL of spring water, then calculate the…

A: Molarity - ratio of number of moles of solute to the volume of solution in litres. Formula is,…

Q: When Mn2+ is mixed with sodium bismuthate, what reaction occurs?

A: The reaction is as follows:

Q: Which of the following is the reason for adding pH 4 buffer in the procedure for the…

A: Answer =(C) Ensure that the complex will not precipitate out of the solution

Q: Why are the results of flame tests for the alkali metal ions difficult to distinguish? (Choose all…

A: Flame test is used to identify the presence of metal ion particularly group 1 metal ions. It is…

Q: On what principle is the method of zone refining of metals based?

A: In nature,metals are not found in pure form . They exist in the form of compounds called ores.Metals…

Q: What are the two reasons why sulfuric acid is added to a filtered solution produced after the…

A: The following two reasons of adding sulfuric acid to a filtered solution produced after the aluminum…

Q: What are the materials that can be used for dry sorption of CO2?

A: Adsorption: It is the process of absorbing certain species or molecules at the topmost layer of the…

Q: Why are metals resposbile for the production of colour upon heating

A:

Q: why is the sulfide and the ferricyanide ions must not be mixed?

A: Given : why is the sulfide and the ferricyanide ions must not be mixed?

Q: Explain the group point, color and magnetic properties before and after oxygen binding.

A: The porphyrin ring with Fe2+ at the center has a darker red colour colour , when O2 is not bounded…

Q: Why do alkali metals and salts impart color to an oxidizing flame?

A: The group 1 elements are called alkali metals. It includes lithium, sodium, potassium, rubidium,…

Q: Which gases are used as shielding gases in tig welding?

A: Given,  Which gases are used as shielding gases in tig welding = ?

Q: Refering to the image attached (Winkler method), what is the function of sodium thiosulphate and why…

A: Wrinkler method is basically used to determine the amount of dissolved oxygen in water sample…

Q: Why was hydrochloric acid added for the flame test of barium?

A: Flame test of barium with con HCl.

Q: Which method are not the way to mitigate the risk of heavy metals? Increasing soil pH with lime O…

A: The presence of heavy metal ions in the soil can make the soil toxic for the growth and development…

Q: (a) Write the principle of electrolytic refining.(b) Why does copper obtained in the extraction from…

A: Write the principle of electrolytic refining.

Q: 3. What colors does Chrome yellow absorb? 4. What is the color of a mixture of Chrome yellow and…

A: Questions: 1) Why calcium carbonate mixed with Prussian blue but not wit Chrome yellow? 2) Colors…

Q: Why Potassium cyanide (KCN) is added in the limit test of lead?

A: In the limit test of Pb (lead), the reaction of lead with dithizone (diphenyl thiocabazone) in an…

Q: Write the balanced equation for the formation of ClF3 gas from the elementalhalogens?

A: When two different halogens reacts together, inter halogen compounds are formed. They can be…

Q: Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

A: The color of the copper sulfate solution is blue. But when an iron nail is dropped into the solution…

Q: a. Describe the appearance of the mixture of iron and sulfur. b. What effect did the bar magnet have…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: A) What is Potassium Trioxalato-Aluminate  B) What are the different uses of this product

A: The solid substance which exhibits a uniform arrangement of atoms in its structure is called…

Q: Ammonia is added when preparing calcium ?oxalate. Why

A: Interpretation -  To tell about why ammonia is added to preparing calcium oxalate -…

Q: Define the following terms:(i) Roasting (ii) Calcination

A: Ores present in nature in rocks formed and it contains valuable metal. Like ore of Zn is ZnS. The…

Q: This method requires acidic conditions to prevent iron from precipitating out as ferric hydroxide…

A: answer = Volhard method use to prevent iron from precipitating out as ferric hydroxide

Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.