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class 10 chemistry question
Answers
51. I)malleability,ii) ductility and malleability iii) ductility iv) sorority
52.zinc is more reactive than copper as it is higher in reactivity series and hence it displaces copper in displacement reaction
Answer:
Explanation:
1. Malleability
2.Ductility
3.Ductility
4.Sonorous
52. In order to prove this, you should carry out a displacement reaction of Zinc and Copper sulfate solution.
Zn+CuSO4 --------------- ZnSO4 +Cu
Here, Zinc replaces Copper from Copper Sulfate solution proving that Zinc is more reactive than copper.
53. A block of impure copper is taken as an anode or positive electrode.
Copper sulfate which is acidified with sulfuric acid is used as a graphite-coated electrolyte along with pure copper tubes, as a cathode or negative electrode.
In this phase of electrolysis copper sulfate divides into a positive ion of copper (Cu+) and a negative ion of sulfate (SO4—). The positive copper ion (Cu+) or cations travel towards the negative electrode made of pure copper where it absorbs the electrons from the cathode. Cu atom is deposited on the cathode’s graphite layer.
Diagram for electrolytic refining is there in the attachement.
54. This is because carbon is less reactive than aluminium. So we need to use electrolytic refining. The bond of aluminium and oxygen is very strong in alumina. Hence carbon cannot be used.
55. Calcination
(i) Calcination is a process in which ore is heated in the absence of air or air might be supplied in limited quantity.
(ii)Calcination involves thermal decomposition of carbonate ores.
(iii)During calcination moisture is driven out from an ore.
Roasting
(i)Roasting involves heating of ore lower than its melting point in the presence of air or oxygen.
(ii)Roasting is carried out mostly for sulfide minerals.
(iii)Roasting does not involve dehydrating an ore.
56.
(i) Ionic compounds are formed by the transfer of electrons that are positively and negatively charged, whereas, covalent compounds are formed by sharing the electrons.
(ii) In an ionic compound, bonding involves a metal and nonmetal, whereas, in the covalent compound, bonding is between nonmetals.
(iii) Ionic compounds are more soluble in water than covalent compounds.
(iv) Ionic compounds have definite shape whereas, covalent has no shape.
(v) Ionic compounds are the good conductor of electricity, whereas covalent compounds are the bad conductor of electricity.
57. The thermite reaction is basically iron oxide (rust) reacting with aluminum to produce molten iron. The products are aluminium oxide, elemental iron, and a large amount of heat. The reactants are commonly or thermite mixture is aluminum powder and iron oxide (rust) powder. When the mixture is heated, it starts reacting as the aluminum is more reactive than the iron and aluminium forms stronger and stable bonds with oxygen than iron.
Use-
1. The reaction is used for thermite welding, often used to join rail tracks.
58. An amalgam is an alloy of mercury with another metal.
59. Magnesium does not react with cold water. It reacts with hot water to form magnesium hydroxide and hydrogen. It also starts floating due to the bubbles of hydrogen gas sticking to its surface.
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