Mixtures

Q. What are the characteristics of a mixture? Explain using examples.

Q. What is a solvent in CuSO4.5H20 molecule

Q. A solution contains 50 mL of ethyl alcohol in 450 mL of water. In terms of volume by volume percentage, the concentration of the solution is %

1. 10
2. 15
3. 20

Q. Which of the following is not a homogeneous mixture?

निम्नलिखित में से कौनसा एक समांगी मिश्रण नहीं है?

1. Sugar in water
   
   जल में शर्करा
   
2. Salt in water
   
   जल में नमक
   
3. Sulphur in carbon disulphide
   
   कार्बन डाइसल्फाइड में सल्फर
   
4. Water in oil
   
   तेल में जल
   

Q. Which of the following is not a pure substance?

1. Hydrogen
2. Copper
3. Oxygen
4. Alloy

Q. Classify the following substance into elements and compounds :
(a) Water, (b) Iron, (c) Common Salt, (d) Benzene, (e) Glucose, (f) Helium, (g) Copper, (h) Oxygen, (i) Marble

Q. Air can be regarded as a/an .

1. compound
2. mixture
3. element

Q. A solution is prepared by mixing $7ml$ of alcohol into $50ml$ of water. Calculate the percentage by volume of alcohol in the solution.​

1. $1.22\%$​
2. $1.34\%$​
3. ​$12.28\%$​
4. ​$13.44\%$​

Q. To get a 12% V/V of alcohol solution, how much water (in mL) should be mixed with 12 mL of alcohol?

1. 100 mL
2. 88 mL
3. 12 mL
4. 50 mL

Q. The particles of a solution are smaller than 1 nm in diameter.

1. True
2. False

Q. Assertion (A): Kerosene in water is a homogeneous mixture.
Reason (R): Kerosene mixes uniformly with water.

1. A is true but R is false
2. Both A and R are true, but R is not the correct explanation of A
3. Both A and R are true, and R is the correct explanation of A
4. Both A and R are false

Q. To get a 12% V/V of alcohol solution, how much water (in mL) should be mixed with 12 mL of alcohol?

1. 100 mL
2. 88 mL
3. 12 mL
4. 50 mL

Q.

Fill in the blanks with correct options.

1.__________ (Elements/ Compounds) cannot be broken into smaller components.

2. _________ (Common salt/ Juice) is an example of mixture.

3. When we drop ink in water we get ________ (homogeneous/ heterogeneous) mixture.

4. _________ (homogeneous/ heterogeneous) mixtures do not show similar property throughout the sample.

Q.

A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?

1. 7.69%

2. 20%

3. 23.07%

4. 30%

Q. Read the statements given below, and identify the correct option.
Statement 1: Air, lemonade, and milk are mixtures.
Statement 2: Copper, aluminium, and iron are elements.

1. Both statement 1 and statement 2 are correct.
2. Both statement 1 and statement 2 are incorrect.
3. Statement 1 is correct, but statement 2 is incorrect.
4. Statement 2 is correct, but statement 1 is incorrect.

Q.

Question 22
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?

Q. HOW MANY ATOMS ARE THERE IN 1 CUP OF WATER i.e. IN 250 GRAM OF WATER

Q.

What are the characteristics of a mixture? Explain with an example of each. [5 MARKS]

Q. A mixture having uniform composition is called (heterogeneous /homogeneous) .................. mixture.

Q. Differentiate between homogeneous and heterogeneous mixtures.

Q. Which of the following are pure substances? Ice, Milk, Iron, Hydrochloric acid, Mercury, Brick and Water. Answer.

Q. Mixtures always have a uniform composition.

Q. Washing machines use the method of centrifugation to squeeze out water from wet clothes.

1. False
2. True

Q. If 1 gram of Sulphur Dioxide contains x molecules, how many molecules will be present in 1 gram of Oxygen ?

Q. Which of the following is true for a homogeneous mixture?

1. Particles settle down
2. Uniform composition
3. More than two phases are present
4. Particles are visible by naked eye

Q. In collogative properties what is the role of solvents ?

Q. Which of the following materials fall in the category of a “pure substance”?

(a) Ice
(b) Milk
(c) Iron
(d) Calcium oxide
(e) Mercury
(f) Brick
(g) Wood
(h) Air

Q. Which of the following is a gas in gas solution?

1. Air
2. Chloroform in nitrogen gas
3. None of the above
4. Both 'a' and 'b'

Q.

A solution contains y ml of acetone in 150ml of solution. The concentration of the solution is $25\%$ in terms of volume by volume percentage. Find y.

1. 50 ml

2. 40 ml

3. 33.3 ml

4. 37.5 ml

Q. Which of the following mixtures cannot be separated by sieving ?

1. Pebbles & sand
2. Rice & dust
3. Salt & water
4. Oil & water
5. Apples & pears
6. Husk & flour
7. Sugar & water
8. Milk & water