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Concentration Terms

Thermite is a...

Question

Thermite is a mixture of :-
1. Zn + Mg
2. Cu + Al
3. Fe + Al
4. None

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Solution

Dear Student,

Answer will be 3.Oxide gives
Thermite is mixture of iron oxide Fe₂O₃ (rust) and aluminium powder. When heated molten iron can be formed from Fe₂O₃.

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{F e}_{2} O_{3}

+ Al (powder) is used in the welding. Reason: Statement- II : Al is a good reductant

Q. Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al₂O₃ + Fe
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Q. Arrange the following metals in which they displace each other from the solutions of their salts in decreasing order:

A l, C u, F e, M g

Z n

E_{A l^{3} + / A l}^{0} + - 1.66 V, E_{C u^{2} + / C u}^{0} = + 0.34 V

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E_{F e^{2} + / F e}^{0} = - 0.44 V, E_{M g^{2} + / M g}^{0} = - 1.40 V

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Q. Which of the following is the correct conclusion. Also, give the reason?

Observation	I	II	III
Solution after reaction	Colourless	Colourless	Colourless
Metal Deposited	Zn	Cu	Fe

(a) Al is more reactive than Cu and Fe but less reactive than Zn
(b) Al is more reactive than Cu but less reactive than Zn and Fe
(c) Al is more reactive than Zn and Cu but less reactive than Fe
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L i

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C a

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F e

P b

C u

H g

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Z n (s) + C u {({N O}_{3})}_{2} (a q) \to C u (s) + Z n {({N O}_{3})}_{2} (a q)

I I

. Zinc and copper are both transition metals.

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