NEET Chemistry Questions: Redox Reactions & Electrochemisty

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Reduction reaction means ____




Reduction is a chemical reaction that involves the gain of electrons by a molecule, atom, or ion. This gain of electrons decreases the oxidation state of the substance. Therefore, the correct definition of a reduction reaction is 'a process of adding electrons.'
Which substance is oxidizing agent ?




An oxidizing agent is a substance that donates oxygen or accepts hydrogen. It causes the oxidation of another substance by accepting electrons from it or donating oxygen to it.
Which substance is called reducing agent ?




A reducing agent is a substance that donates hydrogen or accepts oxygen. It causes the reduction of another substance by donating electrons or hydrogen atoms to it.
Oxidation reaction means




Oxidation is the process of removing electrons from a substance. In a redox (reduction-oxidation) reaction, the substance that loses electrons is said to be oxidized.
Which of the following is the characterictic of reducing agent ?




A reducing agent is a substance that loses electrons and undergoes oxidation in a chemical reaction. By losing electrons, it reduces another substance. The correct characteristic of a reducing agent is that it experiences oxidation.
Which of the following is the characteristic of oxidizing agent ?




An oxidizing agent is a substance that gains electrons and undergoes reduction in a chemical reaction. By gaining electrons, it oxidizes another substance. The correct characteristic of an oxidizing agent is that it experiences reduction.
Which of the following statement is true ?




No explanation available.
Which of the following statement is wrong ?




The correct answer is that all the given statements are correct, making the option 'Given three statements are wrong' the wrong one. In redox reactions, the oxidizing agent gets reduced, the reducing agent gets oxidized, and oxidation and reduction always occur simultaneously (are supplementary processes).
Which of the following does not occur, when a rod of Zn metal is dipped in an aqueous solution of $ CuSO_4 $ ?




No explanation available.
Which of the following observation obtained, when rod of Cu metal is dipped in an aqueous solution of $ AgNO_3 $ ?




No explanation available.
Which substance get oxidized in the reaction : $ 2Al + Cr_2O_3 \rightarrow Al_2O_3 + 2Cr $ ?




In the given reaction, $2Al + Cr_2O_3 ightarrow Al_2O_3 + 2Cr$, aluminum (Al) is oxidized. Oxidation refers to the loss of electrons. Here, aluminum changes from an oxidation state of 0 in $2Al$ to +3 in $Al_2O_3$. Thus, Al is the substance that gets oxidized.
Which substance is a reducting agent in the following reaction ? Reaction : $ 2Al + Cr_2O_3 \rightarrow Al_2O_3 + 2Cr $




The reducing agent is the substance that donates electrons and gets oxidized in the process. In the reaction $2Al + Cr_2O_3 ightarrow Al_2O_3 + 2Cr$, aluminum (Al) donates electrons to reduce $Cr_2O_3$ to Cr and itself gets oxidized to $Al_2O_3$. Therefore, Al is the reducing agent.
In the reaction, $ 2Na + S \rightarrow Na_2S $ , which sustance acts as oxidizing agent ?




In the reaction $2Na + S ightarrow Na_2S$, sulfur (S) acts as the oxidizing agent. The oxidizing agent is the substance that gains electrons and gets reduced. Here, sulfur changes from an oxidation state of 0 in S to -2 in $Na_2S$, thus gaining electrons and being reduced.
Which of following elements does not possess positive oxidation no. in any of its compound ?




Fluorine (F) is the most electronegative element and it always has an oxidation state of -1 in its compounds. It does not exhibit positive oxidation states in any of its compounds.
Which of the following oxidation no. does not possess by Cl, Br and I, when they conbines with oxygen forming chemical bond ?




Chlorine (Cl), Bromine (Br), and Iodine (I) can have positive oxidation states of +1, +3, and +5 when combined with oxygen. However, they do not have a -1 oxidation state when bonded with oxygen, as oxygen is more electronegative and usually takes the negative oxidation state.