Metals and Non-metals
- Define the following terms. (i) Mineral (ii) Ore (iii) Gangue (i) Mineral: The naturally occurring compounds of elements are known as Mineral. (ii) Ore: Minerals from which metals can be extracted profi... 1
- Why do ionic compounds have high melting points? Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires a lot of energy to overcome these fo... 1
- (i) Write the electron-dot structures for sodium, oxygen and magnesium. (ii) Show the formation https://lh3.googleusercontent.com/-5mSXW7_RtTI/Ya5Dz_9aT9I/AAAAAAAAC3w/Hkz-fzukgAUfqc4kUOph7SW-qt6W6uTqACNcBGAsYHQ/image.png (i) The represe... 2
- What would you observe when zinc is added to a solution of iron (II) sulphate? When zinc is added to iron (II) sulphate then it will displace the iron from iron sulphate solution as shown in the following chemical react... 1
- Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Hydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal. When iron reacts with dilute H₂SO₄, iron (II) sulphate w... 1
- Samples of four metals A, B, C and D were taken and added to the following solution one by one. (i) B is most reactive metal. (ii) B will displace copper from copper sulphate. (iii) Arrangement of metals in the order of decreasing react... 1
- Write equations for the reactions of (i) iron with steam (i) Iron react with steam to form the metal oxide and hydrogen. 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (ii) The reaction of calcium with water... 2
- Why is sodium kept immersed in kerosene oil? Sodium is high reactive element. If it is kept in open it can explosively react with oxygen to catch fire. Hence to prevent accidental damag... 1
- Explain the meanings of malleable and ductile. Malleable: Substances that can be beaten into thin sheets are called malleable. For example, most of the metals are malleable. Ductile: Subs... 1
- is a poor conductor of heat. Mercury and Lead 2
- is the best conductor of heat. Silver is answer 2
- can be easily cut with a knife. Sodium is answer 2
- is a liquid at room temperature. Mercury is the answer 2