Question 3 :
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
Question 5 :
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of_________.<br/>
Question 8 : $2C_3H_8 + 7O_2 \rightarrow 2CO_2 + 8H_2O + 2CO + 2C$ <div>Name the type of reaction.</div>
Question 9 :
Fullerene is an allotrope of carbon which is similar to a football. It has 60 carbon atoms joined together and no other element in it. There are various types of fullerenes. $C_{60}, C_{70}, C_{74}$ and $C_{75}$ are the members of the fullerene family. But $C_{60}$ (pronounced as C sixty) is the most stable and most studied form of fullerenes. What do you think is the nature of the bond which is joining these atoms together?
Question 16 :
<span>A chemical process in which a substance reacts with oxygen to give off heat is______</span>
Question 18 :
Identify the product(s) which will be formed by using the information provided about the reactants:<br/>${C}_{4}{H}_{10}(g)+{O}_{2}(g) \rightarrow$
Question 21 :
When methane is burnt in an excess of air, the products of combustion are?<br/>
Question 24 :
Which pollutant gas can be produced as a result of incomplete combustion of octane (${C}_{8}{H}_{18}$)?
Question 25 :
What change will you observe if you test soap with litmus paper (red and blue)?
Question 26 :
<span><span><span><span><span><span><span>A product obtained by mixing sodium hydroxide with vegetable oil is:<br/></span></span></span></span></span></span></span>
Question 27 : Generally, non-metals are not good conductors of electricity. <div>Which of the following is a good conductor of electricity?</div>
Question 29 :
When ethane is burnt in excess of air, the products of combustion are?<br/>
Question 30 :
Crystalline form of carbon having 60 carbon atoms joined together is called :
Question 33 :
Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.<br/>Reason: Air contains much more nitrogen than oxygen.
Question 34 : Which of the following statement(s) is/are correct?<div>(1) Graphite is used in making electrodes because it can conduct electricity.<br/>(2) Graphite is used as a solid lubricant.<br/>(3) Graphite is used in the manufacture of crucibles.<br/>(4) Graphite is also known as the black lead.</div>
Question 36 :
What happens when a piece of silver metal is added to the copper sulfate solution?<br/>
Question 38 :
To protect iron from corrosion and rust, it is coated by :
Question 39 :
Non-metals can't be used to make vessels but metals can. Why?
Question 40 :
The important metal used with iron to produce stainless steel is:
Question 41 :
Which one of the following pairs of substances on reaction will not evolve $H_{2}$ gas?
Question 45 :
Metal $A + \ $ Salt solution of $B\rightarrow $ Salt solution of  $A + \ $ Metal $B$<br/>Which one is more reactive among $A$ and $B$?
Question 46 :
Name one metal that will not react with cold water but will react with steam.
Question 47 :
In metal reactivity series, the more reactive metals are placed at the:
Question 48 :
Which of the following methods is suitable for preventing an iron frying pan from rusting?<br>
Question 49 :
Which one of the following four metals would be displaced from the solution of its salts by other three metals?<br>
Question 51 :
Zinc sulphate forms a colourless solution in water. The colour on adding copper is:<br/>
Question 52 :
 Which chemical reaction correctly represents the reaction between iron and dilute $H_2SO_4$?
Question 53 :
A metal 'M' has shining appearance and reacts with hot water and also with dilute hydrochloric acid to evolve hydrogen gas. The metal 'M' is:
Question 54 :
Metals generally react with water to form corresponding oxides or hydroxides and:
Question 56 :
Identify the metal which reacts with concentrated $H_2SO_4$ or $HNO_3$, but not with concentrated HCl.<br>
Question 58 :
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
Question 61 : <span>Which of the following reactions will occur, according to the activity series?</span><div><span>1. $Fe+Al_2O_3 \rightarrow$ </span><span><br/></span></div><div><span>2. </span><span>$Cu+MgCl_2 \rightarrow$</span></div><div><span>3. </span><span>$Cu +AlCl_3 \rightarrow$</span></div><div><span>4. </span><span>$Fe + HCl \rightarrow$</span></div>
Question 62 :
If $A, B, C, D, E, F, G, H, I, J, K$ represent metals in the decreasing order of their reactivity, which one of item is most likely to displace all of the metals given?
Question 63 :
In the reaction between $Al$ and $Fe_2O_3$, what is the correct final reaction?
