Tag: chemistry

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Questions Related to chemistry

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

Compare the physical properties of metals and non-metals in general with reference to malleability.

  1. Both are malleable

  2. None are malleable

  3. Only metals are malleable

  4. Only non-metals are malleable
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Malleability: Metals have the ability to withstand hammering and can be made into thin sheets known as foils. while non metals are generally brittle.

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

Gallium at room temperature is in :

  1. plasma state

  2. liquid state

  3. solid state

  4. gaseous state
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gallium melts at room temperature and has one of the largest liquid ranges of any metal. The melting point of gallium is used as a temperature reference point. At room temperature, gallium metal is unreactive towards air and water due to formation of a passive protective oxide layer. It melts at $29.76^{\circ} C$ (slightly above the room temperature). It is used as an agent to make alloys and is also useful in semicounductors.

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

Which of the following metal can be cut with the knife?

  1. Gold

  2. Potassium

  3. Iron

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

Sodium, potassium, lithium are soft metals and can be easily cut. It is the secong least dense metal after lithium. It is a soft solid that has a low melting point and can be cut with knife while iron and gold are hard and dense metals which are melleable and ductile.

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

Pick out the bad conductor of electricity from the following:

  1. copper

  2. steel

  3. impure water

  4. air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Copper and steel are metals and metals are a good conductor of electricity generally. impure water contains ions which conduct electricity.  

However air is non-metal and they are bad conductor of electricity.

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

1 kg of iron occupies less space compared to 1 kg of sponge. Why?

  1. Iron has less density than sponge

  2. Iron and sponge have equal densities

  3. Iron has more density than sponge

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
We have 2 materials here in which iron is metal and Sponge is non-metal.
 Metals has usually high density as compared to non-metals.
  and Density*Volume = Mass
  Iron occupies less space because it has high density.
Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Door locks are made of metals because metals:

  1. have lustre

  2. are opaque

  3. are good conductors of heat

  4. are hard and strong
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Door locks are usually needed to be strong to stop thieves or other trespassing. 

So we need a hard and strong material for the manufacturing of locks and metals are feasible for this purpose.

Hence, the correct option is $\text{D}$

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

The property of metals producing a ringing sound when struck is called :

  1. sonority

  2. permeability

  3. ductility

  4. malleability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sonority (of a material) is the property of producing a ringing sound when struck. Most metals are sonorous. Therefore, they are used in many instruments (eg. cymbals and bells). Almost all non-metals are non-sonorous, i.e. they don't produce a ringing sound when struck.


Hence, the correct option is $\text{A}$

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

A metal which is brittle in nature:

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals are a common type of ductile material. Copper, aluminum, and steel are examples of ductile metals. The opposite of ductility is brittleness, where a material breaks when tensile stress is applied to lengthen it. Examples of brittle materials include cast iron, concrete, and some glass products. Zinc is relatively more brittle than others.

The correct option is A.