(1k) Carbon-12 scale is the standard from which atomic masses of all nuclei’s are measured. It is used to ascertain one mole of a substance as the amount of substance which contains as many elementary entities as there are atoms in 12grams of carbon-12

(1j)

  • The concentration of the resistants and products are equal
  • The rate of the forward reaction is same as the rate of the backward reaction

(1i) Carbon-12 scale is the standard from which atomic masses of all nuclei’s are measured. It is used to ascertain one mole of a substance as the amount of substance which contains as many elementary entities as there are atoms in 12grams of carbon-12

(1j)

  • The concentration of the resistants and products are equal
  • The rate of the forward reaction is same as the rate of the backward reaction

(1a)

  • High temperature of 4500degree(c) or more
  • High pressure
  • Catalyst
    (1b)
  • For decoration
  • For protection
    (1c) Calcium oxide (Cao) is alkaline and Hcl is acidic. The two react to form calcium chloride and water; instead of dry Hcl after that, it will end up with wet calcium chloride
    (1d) This is an oxidation reaction. The acid oxidizes the iron (II) sulphate to iron (III). The baron gas evolved is Nitrogen (IV) oxide

(1ei)
(i) Zinc oxide with H2SO4
ZnO(s) + H2SO4 —> ZnSO4(aq) + H2O(l)
(ii) Zinc oxide with sodium hydroxide solutions
ZnO(s) + 2NaOH(aq) —> Na2ZnO(aq) + H2O(l)

(1eii) Amphoteric property
(1f)
(i) Have the same atomic number
(ii) Have different mass numbers

(1g)

  • Hcl
    -O2

(1h)
(i) H2S
(ii) SO2

Chem-Obj
1DAABADACBD
11AABCACDADD
21CCABBDDBAA
31AABDBCDBCB
41BACBCCBDDD

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