Which of the given nbsp-metals exhibits nbsp-both reactions -a- as well as -b- -a- Metal - Oxygen - Metal oxide -b- Metal nbsp- Cold water or hot water or steam nbsp- nbsp- nbsp-Metal hydroxide nbsp- HydrogenMagnesium -Mg- iron -Fe- sodium -Na- and copper -Cu-Magnesium -Mg- zinc -Zn- platinum -Pt- and gold -Au-Sodium -Na- potassium -K- magnesium -Mg- and calcium -Ca-Copper -Cu- magnesium -Mg- gold -Au- and sodium -Na-

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Properties & Uses of Aluminium

Which of the ...

Question

Which of the given metals exhibits both reactions (a) as well as (b)?
(a) Metal + Oxygen $\to$ Metal oxide

(b) Metal + Cold water or hot water or steam $\to$ Metal hydroxide + Hydrogen

Magnesium (Mg), iron (Fe), sodium (Na), and copper (Cu)

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Magnesium (Mg), zinc (Zn), platinum (Pt), and gold (Au)

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Sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca)

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Copper (Cu), magnesium (Mg), gold (Au), and sodium (Na)

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Solution

The correct option is C Sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca)
Sodium (Na), potassium (K), calcium (Ca), magnesium (Mg) reacts with oxygen to form their respective metal oxides. These metals being very reactive, react with cold water, hot water and steam. However, magnesium is less reactive than these three and reacts with hot water and steam.

Iron react with both oxygen and steam. Copper (Cu) reacts with oxygen but is unreactive any form of water.

Platinum (Pt) and gold (Au) are unreactive towards both water and oxygen.

Hence, the elements showing both reactions are sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca).

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Similar questions

Q. The order of reactivity of metals is
(a) K > Na > Ca > Au
(b) K > Ca > Na > Mg
(c) Fe > Na > Mg > Au
(d) Cu > Fe > K > Na

A noble metal is one which is inert and does not react with acids like $H C l, H N O_{3}, H_{2} S O_{4}$ . Select an option with a set of two noble metals.

L i

K

C a

N a

M g

A l

Z n

F e

P b

C u

H g

A g

I

. The reaction

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

will occur.

I I

. Zinc and copper are both transition metals.

Q. Assertion :Carbon cannot reduce the oxides of

N a

M g

. Reason: Sodium and magnesium have higher affinity towards oxygen than towards carbon because these are highly reactive metals.

Observe the table and identify metals and non-metals. Select the correct option.
$\begin{matrix} Sl.No & Set-1 & Set-2 1. & Sodium(Na) & Oxygen(O) 2. & Magnesium(Mg) & Chlorine(Cl) 3. & Iron(Fe) & Helium(He) 4. & Gold(Au) & Sulphur(S) 5. & Calcium(Ca) & Carbon(C) \end{matrix}$

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Which of the given metals exhibits both reactions (a) as well as (b)? (a) Metal + Oxygen → Metal oxide (b) Metal + Cold water or hot water or steam → Metal hydroxide + Hydrogen

Which of the given metals exhibits both reactions (a) as well as (b)?
(a) Metal + Oxygen $\to$ Metal oxide

(b) Metal + Cold water or hot water or steam $\to$ Metal hydroxide + Hydrogen