Question 1 :
Soft metals which can be cut with a knife is/are :<br/>

Question 3 :
Assertion: Copper is used to make hot water tanks and not steel (an alloy of iron). Reason: Copper does not react with cold water, hot water or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.

Question 4 :
A non-metal $X$ exists in two different forms $Y$ and $Z$. $Y$ is the hardest&#160;natural substance whereas $Z$ is a good conductor of electricity. $Y$ is :<br/>

Question 6 :
In the following elements identify the element that is relatively strong?

Question 9 :
Mark the incorrect statement(s).<br/>a) Most of the metals are soft.<br/>b) All metals are equally hard.<br/>c) Sodium is a soft non-metal.

Question 11 :
Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. Changes they observe in the two beakers after an hour&#160;will be :<br/>

Question 12 :
Select the metal that does not react with cold water but reacts with steam when heated is :<br/>

Question 13 :
A strip of copper is placed in four different colourless salt solutions. They are:<br/>$KNO_3,\&#160; AgNO_3,\ Zn(NO_3)_2, \ Ca(NO_3)_2$.&#160;<br/>Which one of the solutions will finally turn blue?

Question 14 :
Metal which is used in packaging and has a valency of $+3$ is: