Tag: chemical properties of metals

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Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Metals oxides are:

  1. basic in nature

  2. electrovalent (ionic) in nature

  3. able to turn red litmus solution blue

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metal oxides typically contain an anion of oxygen in the oxidation state of -2. Oxides which are reacted only by acids are basic oxides. Metals form basic oxides so they can turn red litmus blue as it is alkaline in nature.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

What happens when water vapour is passed over a red hot iron?

  1. No reaction
  2. Oxygen and $Fe{(OH)} _{2}$ are produced
  3. Hydrogen and ${Fe} _{2}{O} _{3}$ are produced
  4. Hydrogen and ${Fe} _{3}{O} _{4}$ are produced
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reaction takes place as

$3Fe + 4H _2O \rightarrow Fe _3O _4 + 4H _2$
so, on passing water vapour over hot red iron we get hydrogen and $Fe _3O _4$.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

A silvery-white metal $X$ reacts with water at room temperature to produce a water-soluble compound $Y$ and a colourless gas $Z$. The reaction is highly exothermic and the $Z$ catches fire immediately during the reaction. The solution of $Y$ in the water on reacting with a stoichiometric amount of dilute solution of hydrochloric acid gives a solution of $pH = 7.0$. 
The compounds $X,\ Y$ and $Z$ respectively are:

  1. $Al,Al(OH) _3 $ and $ H _2$
  2. Ag, AgOH and $H _2$
  3. K, KCl and $H _2$
  4. Na, NaOH and $H _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$2Na+H _2O\rightarrow 2NaOH+H _2+Heat$

$NaOH+HCl\rightarrow NaCl+H _2O$
$X,\ Y,\ Z$ are $Na$, $NaOH$, $H _2$

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Aluminium does not react with water at room temperature because:

  1. it is above hydrogen in the activity series

  2. it is below hydrogen in the activity series
  3. it is covered with a thin film of $AlN$
  4. it is covered with thin film of $Al _2O _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aluminium is oxidized by water at temperatures below $280^oC$  to produce hydrogen, aluminium hydroxide and heat. The challenge in this reaction is circumventing the formed oxide layer which inhibits the reaction and the expenses associated with the storage of energy by regeneration of $Al$ metal.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

What happens when steam is passed over red hot iron?

  1. No reaction takes place.
  2. $O _2$ and $Fe(OH) _2$ are formed.
  3. $H _2$ and $Fe _3O _4$ are formed.
  4. $H _2$ and $Fe _2O _3$ are formed.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When steam is passed over red hot iron, $H _2$ and $Fe _3O _4$ are formed. The reaction is as follows:
$3Fe+4{ H } _{ 2 }O\rightarrow { Fe } _{ 3 }{ O } _{ 4 }+4{ H } _{ 2 }\uparrow $