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Sergio [31]
3 years ago
9

Which metal is more active than H2? (1) Ag (3) Cu (2) Au (4) Pb

Chemistry
1 answer:
astraxan [27]3 years ago
5 0

Answer is (4) - Pb.


According to the reactivity series of elements

- the elements which are above the hydrogen are more reactive than hydrogen.

- the elements which are below the hydrogen are less reactive than hydrogen.


Among the given choices, only Pb is placed above the hydrogen in the reactivity series and rest are below the hydrogen.


Hence, Pb is more active than hydrogen.

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Please help quick
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Answer:

c = 0.898 J/g.°C

Explanation:

1) Given data:

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Final temperature = 42.8° C

Heat absorbed = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

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ΔT = 42.8°C - 25.4°C

ΔT = 17.4°C

Q = 23.0 g ×  × 4.18 J/g°C × 17.4°C

Q = 1672.84 j

2) Given data:

Mass of metal = 120.7 g

Initial temperature = 90.5°C

Final temperature = 25.7 ° C

Heat released = 7020 J

Specific heat capacity of metal = ?

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Q = m.c. ΔT

Q = amount of heat absorbed or released

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ΔT = 25.7°C - 90.5°C

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7020 J = -7821.36 g.°C ×  c

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