Question

7. Name a metal:
(a) That can be cut with knife.
(b) Can be polished
(c) Is used in bells
(d) Used in decoration of Sweets
(e) Shows rusting​

Answer 1

$\underline{\underline{\Huge\mathfrak{Answers:-}}}$

(a) Metal that can be cut with knife

${\implies{\sf{}}}$ Sodium (Na)

(b) Metal that can be polished

${\implies{\sf{}}}$ Brass (an alloy of 67% copper and 33% zinc)

(c) Metal which is used in bells

${\implies{\sf{}}}$ Bronze (an alloy of 78% copper and 22% tin)

(d) Metal which is used in decoration of Sweets

${\implies{\sf{}}}$ Silver (silver foil)

(e) Metal which shows rusting

${\implies{\sf{}}}$ Iron (Fe)

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$\huge{\boxed{\textsf{\Large{\red{About\: Metals:-}}}}}$

➸A metal is a hard substance which are generally :

• Lustrous : Metals having shine.

• Malleable : Metals being hammered into thin sheets.

• Ductile : Metals which can be drawn into thin wires.

➸A metal is a good conductor of heat and electricity.

➸Metals can be chemically an element or an alloy (combination of two metals or a metal and a non metal.)

Answer 2

(a) almost all metals can be cut from knife. just one condition, the knife must be harder from that metal. but generally we say sodium and potassium can be cut with knife since they're soft and can be cut with any knife.

(b) all hard metals can be polished. let us say iron, copper, silver, gold etc.

(c) metals are used in bells because of their sonorous property. it means metals produce sound when beaten. basically alloy of copper and tin is used in bells.

(d) silver and gold are used in decoration of sweets.

(e) all metals corrode but only iron shows rusting or alloys which contains iron may show rusting.