Sorting And Sep...

Consider three groups (i, ii and iii) of various substances given below:

(i) Water, benzene, milk
(ii) Wood, steel, mirror
(iii) Pepper, turmeric, coriander

Which of the following options gives the correct match of the group and the property which is common to all the substances in that group?

Which of the following materials are lustrous?

(i) Steel knife
(ii) Gold jewellery
(iii) Iodine
(iv) Stone
(v) Silk cloth

Among the following groups of objects, select the one in which all the objects can be made from plastic, wood, metal as well as glass.

Which of the following are pure substances?

(i) Elements
(ii) Compounds
(iii) Mixtures

Which of the following is not a mixture?

Identify the odd one among the following.

Which of the following statements is not correct about a compound?

A solution is prepared by dissolving 20 g of sugar in 80 g of water. What is the mass percentage of sugar in water?

Which of the following is the term used for a homogeneous mixture of metals?

Consider the following substances:

(a) Air
(b) Water
(c) Hydrogen
(d) Milk

Which of the given substances exhibit properties such as variable composition and no sharp melting and boiling points?

Classify the following objects into different groups and choose the correct option among those given below:

1. Pencil
2. Wooden table
3. Notebook
4. Bucket
5. Polythene bag
6. Plastic chair
7. Bullock cart

Classify the following materials on the basis of their appearance and choose the correct option.

Four students are provided with four different substances as listed below:

Student A - Chalk powder
Student B - Salt
Student C - Sand
Student D - Sugar

When these substances are added to water, which of the students will obtain a solution?

Which of the following statements is/are incorrect?

a. Iodine crystals have lustre.
b. All metals have a silvery white lustre.
c. Wood is a non-lustrous material.

Rohan's class teacher explained the difference between pure substances and mixtures, and gave some examples from daily life. Choose the option which is a pure substance among the following.

Shreya is provided with the following objects and asked to put them in a bucket containing water.

Wooden toy, iron nail, stone, plant leaf, and plastic ball

Which among the given objects will float and which will sink in water?

Select the hardest object among the following.

Which object among the following is different from the others?

Identify the one which is an element among the following substances.

Salt can be separated from its solution (salt dissolved in water) because