Question 2 :
Most balloons, tyres and footballs are made-of rubber. This is because rubber is:

Question 5 :
Which of the following non-metal is commonly used for purifying water?

Question 6 :
If $X$ is a metal, it will form ______ oxide, which will form ____ solution with water.

Question 9 :
Which of the following non-metal is used for the manufacture of fertilizers?<br/>

Question 10 :
If X is a non-metal, it will not conduct electricity unless it is carbon in the form of __________.

Question 13 :
Metals are usually hard. Hence metals are strong and can withstand heavy loads over them. Due to this property, they are difficult to cut and can be used in the construction of heavy machines, building etc.<br/>On the other hand, non-metals are usually brittle. On hammering them they break into small pieces converting themselves into a fine powder.<br/><br/>In the following elements identify the elements that is relatively brittle?

Question 15 :
When copper is placed in the atmosphere for sufficient time a green crust is formed ion its surface the composition of green crust is&#160; ______________.

Question 16 :
Assertion: No further heating is needed when sulphur reacts with metals. Reason: Reaction of sulphur with metals is exothermic.

Question 17 :
Out of the following, identify the metal present in the green plant:

Question 24 :
Which one of the following nutrients is not available in fertilizers?