Explain the formation of ionic compound CaO with electron number of calcium and oxygen are 20 and 8 respectively. When a small piece of it is left open in the air, it catches fire.
(b) What will you observe when: When these metals are dropped in water, bubbles will be evolved due to evolution of hydrogen gas, large amount of heat is produced and the solution will change red litmus blue. Question 9.
Why is tungsten used almost exclusively for the filament of electric lamp? Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. Answer: Write balanced equations for the reaction of: (CBSE 2011) (iii) Aluminium forms oxide layer on its surface which does not further react with air. Question 19. How is it used to join the railway tracks or craked machine parts?
(ii) They are soluble in water. The way, metals like sodium, magnesium and iron react with air and water is an indication of their relative positions in the ‘reactivity series’.
(ii) copper metal doesnot react even with stream. (c) How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molton state (CBSE 2008)
(a) Activity: To show that metals are good conductors of electricity. (a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. Electricity is conducted by movement of electrons or ions in a substance. Name a reducing agent that may be used to obtain manganese from manganese dioxide. Write one example of each of
(CBSE 2012) (CBSE 2011)
(i) metal ‘A’ which is one of the last, second or third position in the reactivity. Which of the following metals will melt at body temperature (37°C)? (iii) Gangue
How are alloys prepared? (b) Ionic compounds produce free ions in molten state which conduct electricity.
How to derive the conductivity titration curve which accounts for salt formation.
How is zinc extracted from its ore? Explain by drawing electronic structure how any one of the two metals react with a halogen. Solder contains lead and tin.
(CBSE 2015) The bubbles of hydrogen stick to the surface of metal which when moves up takes metal with it and makes it float. (CBSE 2009) But then in one mole of phosphoric acid, there are are three moles of hydrogen ions? Brass contains copper and zinc. You can specify conditions of storing and accessing cookies in your browser, plzz answer these according to the marks given in bracket...plzz someone answer n i request to not put any unwanted ans...if u know give the correct ans, for those who want to show and see❤❤❤meet.google.com/btc-mmow-qwp❤❤❤, ক) আইসােটোপ কাকে বলে?খ) পারমাণবিক সংখ্যা বলতে কী বুঝ?গ) উদ্দীপকের ছকে উল্লিখিত Z মৌলের ১ টি পরমাণুতে বিদ্যমান নিউট্রন সংখ্যা নির্ণয় কর।ঘ) উদ্দীপকের ছ Answer: (CBSE 2012) Au < Cu < Fe < Mg is increasing order of reactivity. Physical properties. (b) Show the formation of CaS by the transfer of electrons.
Answer: Question 12. (b) Why are ionic compounds usually hared? Question 7. (v) E > B > D > A > C. Question 2. Hydrogen gas is formed. As a result when a potential difference has applied the solution to conduct electricity. (ii) For storing, sodium metal is kept immersed in kerosene. Answer: (iii) (a)It should be coated with zinc (i) Nickel and chromium.
Therefore solutions of these substances conduct electricity very well. (CBSE 2008C) (b) Name the ores of the following metals: } Label the (c) Define an alloy. Na2O contains Na+ and O2- ions. Which property of solder makes it suitable for welding electrical wires? Answer: (CBSE 2011) Observe the change in colour and decide the nature of the oxide formed. }, .btn { Do u memorize these things, which is dissociated more? (i) can be easily cut with a knife, (a) Gold and silver are used to make jewellery. (iii) The molten chloride of sodium metal is NaCl, the metal can be obtained by the electrolytic reduction. Acids contain H+ ions in them. At anode: 2Cl– → Cl2(g) + 2e– It is due to the formation of basic copper carbonate [CuCO3], Question 1. Explain with an example. Answer:
Answer: Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g) Write balanced chemical equation of the reaction involved. The bulb glows when all of these metals are placed between the clips. (CBSE 2012) (ii) Mercury is liquid at room temperature. Both sodium hydroxide and hydrochloric acid dissociate almost completely into ions when in water solution. (b) Ionic compounds conduct electricity in molten state. (ii) Which is the least reactive metal? When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Write chemical equations that shows aluminium oxide reacts with acid as well as base. Answer: Answer:
(b) Due to strong force of attraction between Na+ and Cl–, sodium chloride has high melting point. (a) ‘X’ is obtained by chemical reduction with the metals high in reactivity series. Thanks for contributing an answer to Chemistry Stack Exchange! Give balanced chemical equation. Identify X, Y and Z. (iii) calcium with water. Show the electronic transfers in the formation of MgCl2 from its elements. Therefore their solutions only conduct electricity weakly. (iv) They are solid and somewhat hard. It only takes a minute to sign up. (a) 2Al(s) + 3H2SO4(dil.) (c) Name the method used to extract metals of high reactivity. Mercury is obtained by roasting cinnabar. Electricity … (i) a metal and a non-metal, and font-size: 14px;
→ Al2(SO4)3(aq) + 3H2(g)
Question 4.
(b) Write the electronic configuration of sodium and chlorine. Answer: Give reason for the following: (CBSE 2013) (a) Write the chemical name of the coating that forms on silver and copper articles when these are left exposed to moist air. Answer: Answer: Answer: What is an alloy? (CBSE 2012) (c) Copper ore is concentrated by froth-floatation process. Question 30. (d) Show the formation of NaCl from Na and Cl atoms by the transfer of electrons.
A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. (a) It is because metals are sonorous, i.e., they produce sound when struck with a hard substance. (c) Ionic compounds have high melting point because there are strong forces of attraction between ions due to which large amount of energy is required to break this bond. How is mercury obtained from its ore? (a) It is because gold and silver are highly lustrous, malleable and ductile. (CBSE 2013) Bronze contains copper and tin. Question 15. Alloy is a homogeneous mixture of two or more metals. ii) Reaction of metals with nitric acid does … (CBSE 2011) Question 31. Name two metals which react violently with cold water. General Properties:
(c) Why do ionic compounds have high melting points? (b) (i) Nitric acid is a strong oxidising agent, it oxidises the H2 gas to H2O. (b) Bronze is made up of copper and tin. X + YSO4 → XSO4 + Y The solution of each type of these acids has a concentration of 0.1 mole. Question 2.
(CBSE 2011) (i) Name the metal (E). (a) (i) Sodium can be cut with knife. Why does calcium float on water? Posted by Swagata Lakshmi Mallik 18 hours ago, Posted by Siddaraju Siddaraju 9 hours ago, .btn {
(i) These metals get corroded. The same process cannot be used for both of them as highly reactive metals cannot be obtained by chemical reduction. (b) (i) The blue solution will become colourless and reddish brown copper metal will be deposited. (b) Copper, being more reactive than silver, will displace silver from silver nitrate solution and there will be deposition of silver on copper coin. (CBSE 2011) .fnt { There is just a LOT LESS H+ present with phosphoric acid compared to nitric acid(, chem.wisc.edu/deptfiles/genchem/sstutorial/Text12/Tx125/…, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation, Comparison of acids to dissolve phosphates.
Give equations of the reactions. Metal (X) is obtained from its oxides by electrolytic reduction. (a) In the formation of compound between two atoms A and B, A loses two electrons and B gains one electron. CuO + 2HCl → CuCl2 + H2O. Write any three observations you would make when such a metal is dropped into water.
Answer: Question 36. Question 17.
Hence sodium is more reactive than magnesium which is more reactive than copper.
(b) Name two metals that can be used to reduce metal oxides to metals. Question 6. Silver and copper are the best conductor of electricity. Answer: Write symbols of cation and anion present in MgO. (a) Name a metal for each case (a) iron articles are frequently painted. Question 17. (a) A metal, which is preserved in Kerosene.
(b) What will you observe when: When these metals are dropped in water, bubbles will be evolved due to evolution of hydrogen gas, large amount of heat is produced and the solution will change red litmus blue. Question 9.
Why is tungsten used almost exclusively for the filament of electric lamp? Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. Answer: Write balanced equations for the reaction of: (CBSE 2011) (iii) Aluminium forms oxide layer on its surface which does not further react with air. Question 19. How is it used to join the railway tracks or craked machine parts?
(ii) They are soluble in water. The way, metals like sodium, magnesium and iron react with air and water is an indication of their relative positions in the ‘reactivity series’.
(ii) copper metal doesnot react even with stream. (c) How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molton state (CBSE 2008)
(a) Activity: To show that metals are good conductors of electricity. (a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. Electricity is conducted by movement of electrons or ions in a substance. Name a reducing agent that may be used to obtain manganese from manganese dioxide. Write one example of each of
(CBSE 2012) (CBSE 2011)
(i) metal ‘A’ which is one of the last, second or third position in the reactivity. Which of the following metals will melt at body temperature (37°C)? (iii) Gangue
How are alloys prepared? (b) Ionic compounds produce free ions in molten state which conduct electricity.
How to derive the conductivity titration curve which accounts for salt formation.
How is zinc extracted from its ore? Explain by drawing electronic structure how any one of the two metals react with a halogen. Solder contains lead and tin.
(CBSE 2015) The bubbles of hydrogen stick to the surface of metal which when moves up takes metal with it and makes it float. (CBSE 2009) But then in one mole of phosphoric acid, there are are three moles of hydrogen ions? Brass contains copper and zinc. You can specify conditions of storing and accessing cookies in your browser, plzz answer these according to the marks given in bracket...plzz someone answer n i request to not put any unwanted ans...if u know give the correct ans, for those who want to show and see❤❤❤meet.google.com/btc-mmow-qwp❤❤❤, ক) আইসােটোপ কাকে বলে?খ) পারমাণবিক সংখ্যা বলতে কী বুঝ?গ) উদ্দীপকের ছকে উল্লিখিত Z মৌলের ১ টি পরমাণুতে বিদ্যমান নিউট্রন সংখ্যা নির্ণয় কর।ঘ) উদ্দীপকের ছ Answer: (CBSE 2012) Au < Cu < Fe < Mg is increasing order of reactivity. Physical properties. (b) Show the formation of CaS by the transfer of electrons.
Answer: Question 12. (b) Why are ionic compounds usually hared? Question 7. (v) E > B > D > A > C. Question 2. Hydrogen gas is formed. As a result when a potential difference has applied the solution to conduct electricity. (ii) For storing, sodium metal is kept immersed in kerosene. Answer: (iii) (a)It should be coated with zinc (i) Nickel and chromium.
Therefore solutions of these substances conduct electricity very well. (CBSE 2008C) (b) Name the ores of the following metals: } Label the (c) Define an alloy. Na2O contains Na+ and O2- ions. Which property of solder makes it suitable for welding electrical wires? Answer: (CBSE 2011) Observe the change in colour and decide the nature of the oxide formed. }, .btn { Do u memorize these things, which is dissociated more? (i) can be easily cut with a knife, (a) Gold and silver are used to make jewellery. (iii) The molten chloride of sodium metal is NaCl, the metal can be obtained by the electrolytic reduction. Acids contain H+ ions in them. At anode: 2Cl– → Cl2(g) + 2e– It is due to the formation of basic copper carbonate [CuCO3], Question 1. Explain with an example. Answer:
Answer: Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g) Write balanced chemical equation of the reaction involved. The bulb glows when all of these metals are placed between the clips. (CBSE 2012) (ii) Mercury is liquid at room temperature. Both sodium hydroxide and hydrochloric acid dissociate almost completely into ions when in water solution. (b) Ionic compounds conduct electricity in molten state. (ii) Which is the least reactive metal? When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Write chemical equations that shows aluminium oxide reacts with acid as well as base. Answer: Answer:
(b) Due to strong force of attraction between Na+ and Cl–, sodium chloride has high melting point. (a) ‘X’ is obtained by chemical reduction with the metals high in reactivity series. Thanks for contributing an answer to Chemistry Stack Exchange! Give balanced chemical equation. Identify X, Y and Z. (iii) calcium with water. Show the electronic transfers in the formation of MgCl2 from its elements. Therefore their solutions only conduct electricity weakly. (iv) They are solid and somewhat hard. It only takes a minute to sign up. (a) 2Al(s) + 3H2SO4(dil.) (c) Name the method used to extract metals of high reactivity. Mercury is obtained by roasting cinnabar. Electricity … (i) a metal and a non-metal, and font-size: 14px;
→ Al2(SO4)3(aq) + 3H2(g)
Question 4.
(b) Write the electronic configuration of sodium and chlorine. Answer: Give reason for the following: (CBSE 2013) (a) Write the chemical name of the coating that forms on silver and copper articles when these are left exposed to moist air. Answer: Answer: Answer: What is an alloy? (CBSE 2012) (c) Copper ore is concentrated by froth-floatation process. Question 30. (d) Show the formation of NaCl from Na and Cl atoms by the transfer of electrons.
A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. (a) It is because metals are sonorous, i.e., they produce sound when struck with a hard substance. (c) Ionic compounds have high melting point because there are strong forces of attraction between ions due to which large amount of energy is required to break this bond. How is mercury obtained from its ore? (a) It is because gold and silver are highly lustrous, malleable and ductile. (CBSE 2013) Bronze contains copper and tin. Question 15. Alloy is a homogeneous mixture of two or more metals. ii) Reaction of metals with nitric acid does … (CBSE 2011) Question 31. Name two metals which react violently with cold water. General Properties:
(c) Why do ionic compounds have high melting points? (b) (i) Nitric acid is a strong oxidising agent, it oxidises the H2 gas to H2O. (b) Bronze is made up of copper and tin. X + YSO4 → XSO4 + Y The solution of each type of these acids has a concentration of 0.1 mole. Question 2.
(CBSE 2011) (i) Name the metal (E). (a) (i) Sodium can be cut with knife. Why does calcium float on water? Posted by Swagata Lakshmi Mallik 18 hours ago, Posted by Siddaraju Siddaraju 9 hours ago, .btn {
(i) These metals get corroded. The same process cannot be used for both of them as highly reactive metals cannot be obtained by chemical reduction. (b) (i) The blue solution will become colourless and reddish brown copper metal will be deposited. (b) Copper, being more reactive than silver, will displace silver from silver nitrate solution and there will be deposition of silver on copper coin. (CBSE 2011) .fnt { There is just a LOT LESS H+ present with phosphoric acid compared to nitric acid(, chem.wisc.edu/deptfiles/genchem/sstutorial/Text12/Tx125/…, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation, Comparison of acids to dissolve phosphates.
Give equations of the reactions. Metal (X) is obtained from its oxides by electrolytic reduction. (a) In the formation of compound between two atoms A and B, A loses two electrons and B gains one electron. CuO + 2HCl → CuCl2 + H2O. Write any three observations you would make when such a metal is dropped into water.
Answer: Question 36. Question 17.
Hence sodium is more reactive than magnesium which is more reactive than copper.
(b) Name two metals that can be used to reduce metal oxides to metals. Question 6. Silver and copper are the best conductor of electricity. Answer: Write symbols of cation and anion present in MgO. (a) Name a metal for each case (a) iron articles are frequently painted. Question 17. (a) A metal, which is preserved in Kerosene.