Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Tincture of iodine has antiseptic properties. This solution is made by dissolving:

A
iodine in potassium iodide

B
iodine in vaseline

C
iodine in water

D
iodine in alcohol

Solution

Tincture of iodine is an antiseptic, also called as weak iodine solution. It is usually $$27\%$$ elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol and water.
Question 2
1 / -0

Which of the following is the seperation technique to seperate mercury and water?

A
Seperating funnel

B
Sublimation

C
Filteration followed by evaporation

D
Seperating funnel followed by evaporation or distillation

Solution

We can separate them using separating funnel because the two are immiscible and mercury is denser than water.
Question 3
1 / -0

The number of phases present in a true solution is:

A
1

B
2

C
depends on the number of solutes

D
innumerable

Solution

A true solution is when a substance is dissolved into another substance. This means that the particles can't be separated even with filter paper and the solid is no longer visible to the naked eye. Hence, it has only 1 phase.
Question 4
1 / -0

Which one of the following is not a solution?

A
Brass

B
Lemonade

C
Saltwater

D
Milk
Solution
A solution is a homogeneous mixture of two or more components. Brass (alloy), lemonade and saltwater are solutions.
Milk is a colloid of fat globules dispersed in water.
So, option D is correct.
Question 5
1 / -0

Which of the following are homogeneous in nature?
(i) Ice (ii) Wood (iii) Soil (iv) Air

A
(i) and (iii)

B
(ii) and (iv)

C
(i) and (iv)

D
(iii) and (iv)
Solution
Hint: Homogenous mixtures have uniform composition throughout the mixtures.
Explanation:
- Ice is a solid form of water, which is consisting of water molecules. Its composition is uniform.
- Wood consists of plant substances like microfibrils of cellulose (40% to 50%) and hemicellulose (15% to 25%) impregnated with lignin (15% to 30%), dead cells, etc. So, Their composition is not uniform.
- The Soil consists of rock, sand, plant waste, etc. hence, it is also not a homogenous mixture.
- Air is a homogenous mixture of gases like nitrogen, oxygen, carbon dioxide, etc.
Hence, air and ice are homogenous mixtures.

Correct Option: $$C$$
Question 6
1 / -0

Salt can be recovered from its solution by evaporation. Another technique which can be used for the separation of a salt from its solution is :

A
centrifugation

B
sublimation

C
evaporation

D
crystallization

Solution

Crystallization can be used for separation of a salt from its solution. Crystallisation is a separation technique that is used to separate a solid that has dissolved in a liquid and made a solution. The solution is warmed in an open container, allowing the solvent to evaporate, leaving a saturated solution.
Question 7
1 / -0

A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be:

A
chloroform

B
water

C
mixture of both

D
none of these

Solution

As density of water is less than chloroform so upper layer will be of water while lower layer contains chloroform.
Question 8
1 / -0

The teacher instructed three students A, B and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide ($$NaOH$$). A dissolved 50g of $$NaOH$$ in 100 ml of water, B dissolved 50g of $$NaOH$$ in 100g of water while C dissolved 50g of $$NaOH$$ in water to make 100 ml of solution. Which one of them has made the desired solution?

A
A

B
B

C
C

D
All of the above

Solution

'C' has made the desired solution
Mass by volume $$\%= \dfrac{\text{Mass of solute}}{\text{Volume of solution}}\times 100$$
$$=\dfrac{50}{100}\times 100$$
$$= 50\%$$ mass by volume
50 % Mass by volume means 50g of NaOH is dissolved in 100ml of solution. So C makes the solution. A has taken 100 ml of water itself. Hence, A does not make the desired solution. B has taken 100 gm of water. Thus, for B also, the solution will not be $$50\%$$ mass by volume.
Question 9
1 / -0

What would you observe when an aqueous sugar solution is heated to dryness?

A
Water will vaporize

B
Sugar will be left behind in the container

C
Sugar gets mixed with water and vaporize

D
Sugar gets charged

Solution

All the water gets evaporated but this is not suitable for the extraction of sugar. Crystals as the sugar crystals gets charged by heating it in this way.
Question 10
1 / -0

Which of the following is a seperation technique to seperate potassium chloride and ammonium chloride?

A
Distillation

B
Evaporation

C
Condensation

D
Sublimation

Solution

A mixture of ammonium chloride and potassium chloride can be separated using the process of sublimation. You must also note that both these substances are sublimable. This technique is quite feasible in this case as the sublimable temperatures of ammonium and potassium chloride differ widely. Between the two, ammonium chloride has lower sublimable temperature. Therefore, it sublimes first followed by potassium chloride.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 24

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Is Matter Around Us Pure Test - 24

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SHARING IS CARING

Question 1

iodine in potassium iodide

iodine in vaseline

iodine in water

iodine in alcohol

Solution

Question 2

Seperating funnel

Sublimation

Filteration followed by evaporation

Seperating funnel followed by evaporation or distillation

Solution

Question 3

1

2

depends on the number of solutes

innumerable

Solution

Question 4

Brass

Lemonade

Saltwater

Milk

Solution

Question 5

(i) and (iii)

(ii) and (iv)

(i) and (iv)

(iii) and (iv)

Solution

Question 6

centrifugation

sublimation

evaporation

crystallization

Solution

Question 7

chloroform

water

mixture of both

none of these

Solution

Question 8

A

B

C

All of the above

Solution

Question 9

Water will vaporize

Sugar will be left behind in the container

Sugar gets mixed with water and vaporize

Sugar gets charged

Solution

Question 10

Distillation

Evaporation

Condensation

Sublimation

Solution

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