Question 1 :
A strip of copper is placed in four different colourless salt solutions. Which one of the solutions will finally turn blue?<br/>

Question 2 :
Assertion: Metals like Na, K, Ca and Mg are never found in their free state in nature. Reason: Metals are very reactive elements. So, it combine with other non metal to complete its octet. Metals like Na, K, Ca and Mg are never found in their free state in nature.

Question 6 :
Zinc can displace copper from copper sulfate solution because zinc is __________.

Question 8 :
Mark the correct statement:<br/>(a) Sodium metal forms positive ions.<br/>(b) Magnesium forms $Mg^{2+} ions$.<br/>(c) Aluminium forms negatively charged ion.

Question 9 :
A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. The non-metal is :<br/>

Question 13 :
Eventhough a cinema hall is a place prone to fire hazards, the interiors are mostly made of wood or wood based panels. Why is this so ?

Question 15 :
Which of the following metal is used in atomic energy and space projects?

Question 21 :
How many no. of electrons do metals have in their outer most shell?

Question 22 :
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 23 :
In the following elements identify the element that is relatively strong?

Question 24 :
Assertion: You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Reason: Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its charateristic lustre.

Question 26 :
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 28 :
Assertion: Metals and non-metals both can take part in the displacement reaction. Reason: Metals and non-metals both can displace less reactive metal/non-metal and forms product depending upon activity series.

Question 29 :
Assertion: Metals are good conductors of heat and electricity.<br/> Reason: The positive nuclei are surrounded by a &#34;sea&#34; of mobile electrons.

Question 30 :
$X$ is a metal which can replace $Y\;and\;Z$ both from their salt solutions. $Y$ can replace $Z$ but not $W$. $W$ can replace both $Y$ and $Z$ but not $X$. What is the correct reactivity order of $X,\,Y,\,Z$ and $W$?

Question 32 :
If $X$ is a metal, it will form ______ oxide, which will form ____ solution with water.

Question 33 :
Most balloons, tyres and footballs are made-of rubber. This is because rubber is:

Question 35 :
Non-metal which is essential for our life and all living beings inhale it during breathing is :<br/>

Question 38 :
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 39 :
State whether true or false :<br/>Coins can be made up of pure metals.

Question 44 :
Elements which form positively charged ions by losing electrons in all chemical reaction are called:

Question 48 :
Because of high electropositivity, the atom of metals can easily form :