Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry composition of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Apparatus used to sediment particles in supension is : 

  1. centrifuge

  2. barometer

  3. balance

  4. calorimeter

  5. battery
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Apparatus used to sediment particles in supension is centrifuge.
Calorimeter is used to measure the heat absorbed or released by a reaction.
Barometer is used to measure pressure.
Balance is used to measure weight of a substance.
Battery is used to provide electricity.

Multiple choice chemistry nature of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Match the List-I (Colloidal dispersion) with List-II (Nature of the dispersion) and select the correct answer using the codes given below the lists:

Lits-I(Cooloidal dispersion) List-II(Nature of dispersion)
A. Milk 1. Solid in liquid
B.Clouds 2. Liquid in gas
C. Paints 3. Solid in solid
D. Jellies 4. Liquid in liquid
5. Liquid in solid

  1. A- 4; B- 2; C- 1; D- 5

  2. A- 1; B- 5; C- 3; D- 2

  3. A- 4; B- 5; C- 1; D- 2

  4. A- 1; B- 2; C- 3; D- 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Milk is an emulsion of dispersed phase as a liquid in the dispersion medium as a liquid. This makes A-4, excludes Option B and D from answer choice.
Cloud is aerosol where dispersed phase is liquid and the dispersion medium is gas, Thus this makes B-2.
Paint is a solid phase in liquid medium makes C-1 and Jellies are a liquid phase in solid medium makes D-5.
Thus, option A is correct.

Multiple choice chemistry nature of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Compounds that lowers the surface tension between two liquids or a liquid and a solid are called surfactants.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Any molecule which helps in decreasing the surface tension that is the inter facial tension between the two surfaces of liquids or solid-liquid surface is known as surfactants. Some common examples are Soaps and Detergents.
hence the answer is true

Multiple choice chemistry composition of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Powder coating is a process which requires a solvent to keep the binder and filler parts in a liquid suspension form.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form while liquid paints require.

Multiple choice chemistry composition of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Colour of colloids depends on which of the following factors?

  1. Size

  2. Mass

  3. Charge

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

Colour of colloidal solution depends upon particle size.
The colour of colloidal solution changes with size of particle, eg, as particle size increases, the colour of gold solution changes from red to blue and finally to golden.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

The region in atmosphere containing water vapour is:

  1. thermosphere

  2. stratosphere

  3. troposphere

  4. mesosphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The troposphere is the lowest region of the atmosphere, i;e., closest to earth's surface. It extends roughly to a height of about 11 km. This is the region of all living organisms including, animals and plants. 


About 70% of the total mass of the atmosphere and practically all the water vapours and dust particles are concentrated in this region

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

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

The acid rain is caused when air polluted by large volume of :

  1. sulphur dioxide

  2. nitrogen dioxide

  3. carbon dioxide

  4. both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acid rain is more properly called acidic deposition, which occurs in both wet and dry forms. Wet deposition usually exists in the form of rain, snow, or sleet but also may occur as fog, dew, or cloud water condensed on plants or the earth's surface. Dry deposition includes solid particles (aerosols) that fall to the earth's surface. Condensation of fog, dew, or cloud water is referred to as occult deposition.
The most common acidic substances are compounds containing hydrogen, sulphates, and nitrates. The chief source of these compounds is the combustion of fossil fuels such as coal, petroleum, and petroleum by-products, primarily gasoline.
Hence, acid rain is caused when air polluted by a large volume of sulphur dioxide.