Impure Substance

Q. A homogenous mixture of a solute in a solvent is called a ___.

Q. Which of the following is a miscible pair of liquids?

1. Alcohol in water
2. Glycerine in water
3. Kerosene in water
4. Oil in water

Q.

Classify the following substance as element, compound or mixture:

Diamond

Q.

Which of the following is a homogenous mixture?

1. salt and oil

2. salt and air

3. salt and water

4. salt and petrol

Q. Differentiate between hydrated and anhydrous salts .

Q.

In chromatography how do we know if a substance is pure ?

1. Dual colour spotting

2. Single colour spotting

3. Tri colour spotting

4. Many colour spotting

Q.

Which of the following statement is true?

1. In pure substance, there can be some mixing of particles

2. In impure substance, all the particles are identical

3. In pure substance, all the particles are identical

4. Either A or C

Q. Sugar+Ethanol= Homogeneous MIxture, but Salt+Ethanol= Heterogeneous Mixture? Why

Q.

How and why are mineral acids different from organic acid

Q. What is a supersaturated solution?

Q. On the basis of composition of matter, milk is considered to be:

1. a pure substance
2. an element
3. an impure substance
4. a compound

Q. Which pair of the following substances is said to be isomorphous?

1. White vitriol and epsom salt
2. White vitriol and blue vitriol
3. Blue vitriol and Glauber salt
4. Epsom salt and Glauber salt

Q.

Which of the following best describes the properties of a solution?

1. Solution is a homogeneous mixture

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

3. It is composed of only one phase

4. All of these

Q. Which amongst the following is a compound?

1. Methane
2. Mercury
3. Iron
4. Copper

Q. Select the correct answer from the choice in brackets.

Q. The 'sea-water' can be classified as a homogeneous as well as hetrogeneous mixture. Comment.

Q. chromatogram of pure samples of food colours of X, Y and Z is given in the following illustration
1. Three samples of same food materials A, B and C are analysed for purity, with the help of the chromatogram in illustration
2. Identify the impure sample.

Q. Tap water is:

1. compound
2. a mixture
3. an element
4. none of these

Q. What do we mean by racemic mixture?

Q. Alan has powdered iron and powdered sulphur in two beakers. A/an _______ is formed if he mixes both of them together at room temperature.

1. mixture
2. pure substance
3. compound
4. element

Q. Maam is filtered tea a homogeneous mixture?