Question

Chapter- 4 ( Metals and Non- metals) 1. Which of the following is/are metalloid? a. Silicon b. Iodine c. Both (a) & (b) d. Gallium 2. Which of the following is/are noble gas? a. Hydrogen b. Argon c. Neon d. Both (b) &(c) 3. Chile saltpetre contains: - a. Hydrogen b. Carbon c. Nitrogen d. Chlorine 4. A metal with low melting and boiling point is :- a. Al b. K c. B d. Mg 5. Match the column: - Metal Uses a. Copper. i)construction purposes b. Iron ii) automobile batteries c. Aluminium. iii) cables & wires d. Lead iv) photography e. Silver. v) metallic paints 6. Fill in the blanks: - a. A pencil lead is made up of a non-metal called ______. b. Non metals do not make a ______ sound when struck hard. c. Non metals are ______ conductors of electricity. d. Non metals are not good conductors of heat hence they are also called as ______. e. Bromine is the only non-metal which is ______ at room temperature. 7. Cooking utensils are made of metals but their handles are made of wood or plastic. Why? 8. Why is it advised not to store pickles and curd in metallic utensils? 9) Learn and write periodic table 1-20 elements

Answer 1

1.d. gallium

2.d.both b) & c)

4.B

5.COPPER--CABLES AND WIRES

IRON --CONSTRUCTION PURPOSE

Answer 2

Answer:

1)gallium your answer