Naveen studied the characteristics of three metals X- Y and Z- when exposed to moist air- Following observations were made- matrix Metal - Colour change 1Y - Brownish Z - No change lendmatrix Identify the probable metals Naveen had-A- beginarray 1111 - X - Y - Z 1c - Fe - K - Aglend array B- Ybeginarray 1111 - X - Y - Z b - Fe - Ag - Aulend array C- Wbeginarray 1111- X - Y - Z 1d - Na - Ca - Aulend array D- beginarray 1111- X - Y - Za - Cu - Fe - Ptlendarray

The correct option is D [ amp; X amp; Y amp; Z; a) amp; Cu amp; Fe amp; Pt ]X – Cu, Y – Fe, Z – Pt. Copper and iron get corroded when exposed t ...

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Standard VIII

Chemistry

Metals Reaction with Oxygen (Burnt in Air)

Naveen studie...

Question

Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made:

$\begin{matrix} M e t a l & C o l o u r c h a n g e X & G r e e n c o a t i n g Y & B r o w n i s h r e d Z & N o c h a n g e \end{matrix}$

Identify the probable metals Naveen had.

\begin{matrix} X & Y & Z a) & C u & F e & P t \end{matrix}

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\begin{matrix} X & Y & Z b) & F e & A g & A u \end{matrix}

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\begin{matrix} X & Y & Z c) & F e & K & A g \end{matrix}

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\begin{matrix} X & Y & Z d) & N a & C a & A u \end{matrix}

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Solution

The correct option is A $\begin{matrix} X & Y & Z a) & C u & F e & P t \end{matrix}$
X – Cu, Y – Fe, Z – Pt. Copper and iron get corroded when exposed to air and moisture, but not platinum. According to the reactivity series, copper and iron are more reactive than platinum. Copper forms the green coloured layer of basic copper carbonate. Iron undergoes rusting to form brown coloured layer of hydrated iron oxide.

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Similar questions

Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made:

$\begin{matrix} M e t a l & C o l o u r c h a n g e X & G r e e n c o a t i n g Y & B r o w n i s h r e d Z & N o c h a n g e \end{matrix}$

Identify the probable metals Naveen had.

Q. Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made:

\begin{matrix} M e t a l & C o l o u r c h a n g e X & G r e e n c o a t i n g Y & B r o w n i s h r e d Z & N o c h a n g e \end{matrix}

Identify the probable metals Naveen had.

Q. Sunil studied the characteristics of four metals W, X, Y, and Z, which were exposed to the atmosphere. He noted down the following observations:

\begin{matrix} Column I & Column II W & No layer X & Greenish layer Y & Black layer Z & Reddish-brown layer \end{matrix}

Identify W, X, Y, and Z.

Q. If x, y, z are different from zero and

|\begin{matrix} 1 + x & 1 & 1 \\ 1 & 1 + y & 1 \\ 1 & 1 & 1 + z \end{matrix}| = 0

, then the value of x⁻¹ + y⁻¹ + z⁻¹ is

(a) xyz
(b) x⁻¹ y⁻¹ z⁻¹
(c) − x − y − z
(d) − 1

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Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made: MetalColour changeXGreen coatingYBrownish redZNo change Identify the probable metals Naveen had.