Tag: chemistry

Questions Related to chemistry

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

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

  1. Both are malleable

  2. None are malleable

  3. Only metals are malleable

  4. Only non-metals are malleable

Show answer
Correct Option: C
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.

Gallium at room temperature is in :

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

  1. plasma state

  2. liquid state

  3. solid state

  4. gaseous state

Show answer
Correct Option: B
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.

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

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

  1. Gold

  2. Potassium

  3. Iron

  4. None of the above

Show answer
Correct Option: B
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.

Pick out the bad conductor of electricity from the following:

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

  1. copper

  2. steel

  3. impure water

  4. air

Show answer
Correct Option: D
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.

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

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

  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

Show answer
Correct Option: C
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.

Which of the following are magnetic?

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

  1. Eraser

  2. Plastic ruler

  3. Safety pins

  4. Paper

Show answer
Correct Option: C
Explanation:

Eraser, plastic ruler and safety pins are non-metals so they are not magnetic as per the characteristics of non-metals. but safety pins are metals and are magnetic in nature.

Door locks are made of metals because metals:

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

  1. have lustre

  2. are opaque

  3. are good conductors of heat

  4. are hard and strong

Show answer
Correct Option: D
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 $\text{D}$

Metal which give out a musical note when struck are called ________.

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

  1. ductile

  2. sonorous

  3. malliable

  4. all of these

Show answer
Correct Option: B
Explanation:

Metal which give out a musical note when struck are called sonorous.

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

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

  1. sonority

  2. permeability

  3. ductility

  4. malleability

Show answer
Correct Option: A
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 $\text{A}$

A metal which is brittle in nature:

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

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury

Show answer
Correct Option: A
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.