Question 1 :
When an atom reacts chemically and gains one or more electrons, it is said to have been ?

Question 5 :
Iron is extracted from iron oxide using carbon monoxide as shown.<br>iron oxide + carbon monoxide $\rightarrow$ iron + carbon dioxide<br>Which statement is correct?

Question 8 :
Which of the following behaves as both oxidizing and reducing agents ?<br>

Question 9 :
Which of the following acts both as oxidising as well as reducing agent?

Question 10 :
Change of orange color of chromium(VI) to green color of chromium(III) indicates presence of a:

Question 12 :
Name the reducing agent in the following:<br>$3MnO_{2} + 4Al \rightarrow 3Mn + 2Al_{2}O_{3}$

Question 13 :
When Carbon monoxide is passed over heated copper oxide it gives :<br/>

Question 15 :
Statement: Reducing agents are mostly non-metals while oxidizing agents are mostly metals.<br/>State whether the given statement is true or false.<br/>

Question 16 :
Rusting of iron in the presence of moist oxygen is an oxidation reaction.<br/>

Question 17 :
Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:

Question 18 :
Out of the halogens, which one is the most powerful oxidizing agent?

Question 21 :
How many moles of electrons are involved in the reduction of one mole of $MnO^-_4$ ion in alkaline medium to $MnO^-_3$?

Question 22 :
In which of the following reactions, does a non-metal act as a reducing agent?

Question 25 :
Which of the following chemical species will be same in the given procedure ?