Question 3 : Equivalent weight of $Mn{ O }_{ 4 }^{ - }$ is equal to molecular weight, when it changes into new species $X$. <br/><div>What is $X$? It is by oxidation or reduction.<br/></div>
Question 4 :
Bleaching of flowers by chlorine is permanent due to oxidation whereas bleaching by $SO_2$ is temporary due to reduction.<br>If true enter 1, else enter 0.<br>
Question 5 :
Assertion: Oxidation number of an element can be a whole number, zero or a fractional number. But valency can never be zero.
Reason: Valency of inert gases is zero.
Question 6 : The reaction between magnesium and carbon dioxide is shown in the equation.<br/>$2Mg + CO_{2}\rightarrow 2MgO + C$<br/><br/><div>Which statement describes what happens in this reaction?</div>
Question 7 :
The phosphate of metal has the formula $MPO_4$. The formula of its nitrate will be:
Question 9 :
Assertion: In the species, $S_{4}O_{6}^{2-}$ each of the two extreme sulphurs exhibits oxidation state of $+5$ and the two middle sulphurs as zero.
Reason: The average of four oxidation numbers of sulphurs of the $S_{4}O_{2-}^{6}$ is $2.5.$.
Question 10 :
Alumino thermite process involves reduction of chromium with oxide and aluminium.
Question 12 :
Which of the following shows highest oxidation number in combined state:
Question 14 : <div>Which of the reactants act as oxidant or reductant if any:<br/></div><div><br/></div>$[Ag(NH_3)_2]^++ 2H^+ \rightarrow Ag^+ + 2NH^+_4$
Question 15 :
A compound of Xe and F is found to have $53.5\%$ Xe. What is the oxidation number of Xe in this compound?
Question 16 : <div>Which of the reactants act as oxidant or reductant if any:<br/></div><div><br/></div>$ Ca + Cl_2 \rightarrow CaCl_2$
Question 17 :
The oxidation state of the underlined element in the given compound is:<br/>$Na_2[\ \underline{Fe}(CN)_5NO\ ]$
Question 18 :
In which of the following does sulphur has the lowest oxidation state?<br>
Question 19 :
The oxidant which cannot act as a reducing agent is :
Question 21 :
Arrange the following in the increasing order of oxidation state of $Mn.$<br/>(i) $Mn^{2+}$<br/>(ii) $MnO_2$<br/>(iii) $KMnO_4$<br/>(iv) $K_2MnO_4$.
Question 22 :
The oxidation state of the underlined element in the given compound is:<br/>$K_2\underline{Ta}F_7$
Question 24 : <div>Following reaction is:</div>$Mn{ O }_{ 4 }^{ - }(aq)\longrightarrow Mn{ O }_{ 4 }^{ 2- }(aq)$
Question 25 : <div>True statements for the chemical reaction of the formation of lithium oxide is:<br/>$4Li(s) + O_2(g)\rightarrow 2Li_2O(s)$<br/></div>
Question 26 :
Oxidation state of phosphorous in $\displaystyle \ { P } { O }_{ 4 }^{ 3- }$ is:<br/>
Question 28 :
Which of the followings is an spectator ion in the reaction?<br>$2Na+2HCl \rightarrow 2NaCl + H_2$<br>
Question 31 :
An element in its free state will have the oxidation number:<br/>
Question 32 :
Which of the following species is reduced in the following (unbalanced) reaction?<br>${ S }_{ 2 }{ O }_{ 3 }^{ 2- }+{ Cl }_{ 2 }\longrightarrow H{ SO }_{ 4 }^{ - }+{ Cl }^{ - }$
Question 35 :
When an oxidising agent reacts, it consumes electrons. In the following changes, which one of the oxidising agents has consumed maximum number of electrons per mole?
Question 36 :
Among the following, identify the species with an atom in $+6$ oxidation state.
Question 37 :
The sum of the oxidation number of all the atoms of a neutral molecule must be:
Question 38 : Match the compounds given in column I with oxidation states of carbon given in column II and mark the apropriate choice.<br/><table class="wysiwyg-table"><tbody><tr><td></td><td>Column I</td><td></td><td>Column II</td></tr><tr><td>(A)</td><td>$ C_6H_{12}O_6$</td><td>(i)</td><td>+3</td></tr><tr><td>(B)</td><td>$CHCl_3$</td><td>(ii)</td><td>-3</td></tr><tr><td>(C)</td><td>$CH_3CH_3$</td><td>(iii)</td><td>+2</td></tr><tr><td>(D)</td><td>$(COOH)_2$</td><td>(iv)</td><td>0</td></tr></tbody></table>
Question 39 :
Oxidation number of P in ${ KH }_{ 2 }{ PO }_{ 3 }$ is:
Question 41 :
In a reaction, $4$ moles of electrons are transferred to $1$ mole of ${HNO}_{3}$. The possible product obtained due to reduction is :
Question 42 :
$A, B$ and $C$ are three elements forming a part of compound in oxidations states of +2, +5 and -2 respectively. What could be the compound?
Question 43 :
Which of the following species are oxidised and reduced in the following (unbalanced) reaction?<br>${ CN }^{ - }+O{ Cl }^{ - }\longrightarrow { N }_{ 2 }+H{ CO }_{ 3 }^{ - }+{ Cl }^{ - }$
Question 44 :
Oxidation number and covalency of sulphur in $ S_{8}$ molecule respectively are _________.
Question 45 :
The oxidation number of $C$ in $\mathrm { CH } _ { 4 } , \mathrm { CH } _ { 3 } \mathrm { Cl } , \mathrm { CH } _ { 2 } \mathrm { C } 12$ CHCI3 and $CCl_{4}$ is respectively
Question 47 :
Starch iodide paper is used to test for the presence of :
Question 49 :
In which of the following compounds the oxidation number of carbon is not zero?
