Metals and non metals Worksheet-16

Metals and non metals Worksheet-16

 

True/False:

  1. Non-metals form basic oxide.

  2. Given reaction is true / false. Cu(s) + SnCl2(g) → CuCl2(s) + Sn(s)

  3. Sulphur is a yellow solid.

  4. Carbon di-oxide turns litmus solution blue.

  5. Carbon Monoxide has no effect on litmus solution.

  6. Nitrogen monoxide is an acidic oxide.

  7. Non-metals do not react with water or steam to evolve Hydrogen gas.

  8. Non-metals react with acids evolving H2(g)

  9. Zinc oxide is a basic oxide.

  10. Given reaction is true or false. Al(s) + HNO3(CoCl) → Al(NO3)3 + H2(g)

  11. Non-Metals react with dilute acids evolving Hydrogen gas.

  12. Carbon tetrachloride is a good conductor of electricity.

  13. Phosphorus reacts with dil. H2SO­4 evolving Hydrogen gas.

  14. Tin reacts with concentrated forming tin oxide and nitrogen di-oxide.

  15. N3H is known as hydrazoic acid.

  16. Ethyne (C2H2) is an ionic compound.

  17. Glucose is a poor conductor of electricity.

  18. Ammonia is an ionic hydride of Nitrogen.

  19. Covalent bond is formed between atoms of same element, like (O2, N2, H2)

  20. Copper sulphate is a covalent compound.

  21. Metals above copper in the reactivity series are found in their compound state in the earth crust.

  22. Sodium is found in native state in the earth crust.

  23. Metallic sodium is obtained by electrolysis of aqueous sodium chloride.

  24. In calcination, ore is heated with calcium.

  25. Iron can be precipitated from ferrous sulphate on adding lead.

 

Answer key:

  1. False

  2. False: Copper cannot displace tin from its salt solution .

  3. True:

  4. False: Carbon-di-oxide is an acidic oxide, if forms H2CO3 (carbonic acid) with water so it will turn litmus solution red.

  5. True

  6. False: Neutral.

  7. True

  8. False: Non metals form –ve ions by gaining efor releasing H+ ions from acids as H2 gas electrons should be given to it.

  9. False: It is amphoteric

  10. False: Nitric acid is an oxidizing agent, if oxidize Hydrogen to water.

  11. False: Non-metals form-negative ions and hence cannot loose electrons to reduced Hydrogen ions of acids.

  12. False: Carbon is a non-metal and it forms covalent halides it. It does not conduct electricity.

  13. False: Phosphorus is a non-metal thus forms negative ions. It cannot loose/give electrons to hydrogen ions of acid & reduce it forming hydrogen gas.

  14. True

  15. True

  16. False: Non-metals form covalent hydrides.

  17. True: Glucose is a covalent compound so it cannot conduct electricity.

  18. False: Non-metals form covalent hydrides.

  19. True

  20. False: It is a metal compound so it is ionic (Cu2+ and SO42– ions present)

  21. True

  22. False: Sodium is highly reactive so it cannot be found in native state.

  23. False: It is obtained by electrolysis of molten sodium chloride.

  24. False: Ore is heated in the absence of oxygen.

  25. False: Lead  is less reactive than Iron so lead cannot  displace iron  from ferrous sulphate.