Tag: general characteristics and uses of metals

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Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Out of sulphur and gold, which will be have higher melting point?

  1. Sulphur

  2. Gold

  3. Both have equal melting point

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gold is a transition metal with a melting point of approximately 1064 C. Sulphur is a non-metal with a much lower melting point of approximately 115 C.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Mark the incorrect statement(s).
a) Most of the metals are soft.
b) All metals are equally hard.
c) Sodium is a soft non-metal.

  1. a, b

  2. b, c

  3. a, c

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most of the metals are hard. But all the metals are not equally hard. The hardness varies from metal to metal. Most of the metals like iron, copper etc. are very hard. Sodium, potassium are exceptions.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The concentration of matter in a material is:

  1. volume

  2. mass

  3. density

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For a pure chemical, the mass concentration is equal to its density (mass divided by volume); thus the mass concentration of a component in a mixture can be called density of a component in a mixture.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Convert $19200\;kg/m^3$ into $g:cm^{-3}$.

  1. $192\;g\:cm^{-3}$
  2. $1.92\;g\:cm^{-3}$
  3. $19.2\;g\:cm^{-3}$
  4. $1920\;g\:cm^{-3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$1\;kg=1000\;g$
Conversion factor $ =\dfrac{1000\:gm}{1kg}$
$1\;m=100\;cm$
Conversion factor $ =\dfrac{1\:m}{100\:cm}$
$\therefore\;19200\;kg\:m^{-3}=19200\;kg\:m^{-3} \times\dfrac{1000\;g}{1\;kg}\times \begin{pmatrix}\dfrac{1\;m}{100\;cm}\end{pmatrix}^3$
$=19.200\;g/cm^3 = 19.2\:g\:cm^{-3}$

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Mark the correct statement.
a) Metals lose their lustre on keeping in air.
b) Gold is lustrous.
c) Metals are lustrous and can be polished.

  1. a, b

  2. b, c

  3. a, c

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metals lose their lustre when kept exposed to air for long time and gets a dull appearance. It loses most of its shine and lustre.