When steam reacts with a metal like iron at a high temperature it gives A and B. The same metal when reacted with an acid forms A and C. Which of the following is/are not true about the properties of A.

It reacts with carbon to form methane

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It is used in Haber's process for the manufacture of ammonia

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It is soluble in water due to its polar structure.

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It can be liquified under high temperature and low pressure

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Solution

The correct option is D It can be liquified under high temperature and low pressure
$3 F e + 4 H_{2} O ⇌ F e_{3} O_{4} B + 4 H_{2} ↑ A$
$F e + 2 H C l \to F e C l_{2} C + H_{2} ↑ A$
A is dihydrogen. It is insoluble in water because of its non-polar structure. It can be liquified at low temperature and high pressure.
$H_{2} + C 1420 K - --- \to C H_{4}$
Haber's process,
$N_{2} + 3 H_{2} ⇋ N H_{3}$
At 673K, 200atm, iron as a catalyst and molybdenum as a promoter.

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Q. From the metals-copper, iron, magnesium, sodium and zinc-select a different metal in each case which :
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(d) does not react with cold water, but reacts with steam when heated.

From the metals: copper, iron,magnesium, sodium, and zinc, select a different metal in each case which:

(a) does not react with dilute hydrochloric acid,

(b) can form $2^{+}$ and $3^{+}$ ions,

(d) does not react with cold water but reacts with steam when heated.

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From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
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