285306
The oxidation number of nitrogen atoms in\(\mathrm{NH}_4 \mathrm{NO}_3\) are
1 \(-3,+5\)
2 \(+3,-5\)
3 \(-3,-3\)
4 \(+5,+5\)
Explanation:
(a)\(\mathrm{NH}_4 \mathrm{NO}_3\) is formed by \(\mathrm{NH}_4^{+}\)and \(\mathrm{NO}_3^{-}\). Let oxidation number of N is \(x\).
\(\begin{aligned}
& x+4=+1 \\
& x=-3 \\
& \text { In } \mathrm{NO}_3^{-} \\
& x+3(-2)=-1 \\
& x=+5
\end{aligned}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285307
In which of the following cases a chemical reaction is possible?
1 \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon.
2 Conc.\(\mathrm{HNO}_3\) is stored in a platinum vessel.
3 Gold ornaments are washed with dil.HCl .
4 \(\mathrm{ZnSO}_4(\mathrm{aq})\) is placed in a copper vessel.
Explanation:
(a) When \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon, displacement reaction will takes place i.e., Cu displace Ag from \(\mathrm{AgNO}_3\) solution
\(\mathrm{Cu}+2 \mathrm{AgNO}_3 \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{Ag}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285308
The number of moles of electron required to reduce 0.2 mole of\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) to \(\mathrm{Cr}^{+3}\)
1 1.2
2 6
3 12
4 0.6
Explanation:
(a)\(\stackrel{+6}{\mathrm{Cr}_2} \mathrm{O}_7^{2-}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}\).
Change in oxidation state \(=+3\) per chromium atom.
1 mole of \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) required \(=6 e^{-}\)
\(\therefore \quad 0.2\) moles of Cr required
\(=0.2 \times 6=1.2 \text { moles of } e^{-\mathrm{s}}\)
Karnataka CET 2019
CHEMISTRY(KCET)
285309
For the redox reaction,
\(\begin{aligned}
& x \mathrm{MNO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+z \mathrm{H}^{+} \\
& \quad \rightarrow \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
The values of \(x, y, m\) and \(n\) are
1 \(10,2,5,2\)
2 \(2,5,2,10\)
3 \(6,4,2,4\)
4 \(3,5,2,10\)
Explanation:
(b) The balanced reaction is given as
\(\begin{aligned}
2 \mathrm{MnO}_4^{-}+5 \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+6 \mathrm{H}^{+} & \rightarrow \\
& 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2+8 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Thus, \(x=2, y=5, m=2\) and \(n=10\)
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHEMISTRY(KCET)
285306
The oxidation number of nitrogen atoms in\(\mathrm{NH}_4 \mathrm{NO}_3\) are
1 \(-3,+5\)
2 \(+3,-5\)
3 \(-3,-3\)
4 \(+5,+5\)
Explanation:
(a)\(\mathrm{NH}_4 \mathrm{NO}_3\) is formed by \(\mathrm{NH}_4^{+}\)and \(\mathrm{NO}_3^{-}\). Let oxidation number of N is \(x\).
\(\begin{aligned}
& x+4=+1 \\
& x=-3 \\
& \text { In } \mathrm{NO}_3^{-} \\
& x+3(-2)=-1 \\
& x=+5
\end{aligned}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285307
In which of the following cases a chemical reaction is possible?
1 \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon.
2 Conc.\(\mathrm{HNO}_3\) is stored in a platinum vessel.
3 Gold ornaments are washed with dil.HCl .
4 \(\mathrm{ZnSO}_4(\mathrm{aq})\) is placed in a copper vessel.
Explanation:
(a) When \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon, displacement reaction will takes place i.e., Cu displace Ag from \(\mathrm{AgNO}_3\) solution
\(\mathrm{Cu}+2 \mathrm{AgNO}_3 \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{Ag}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285308
The number of moles of electron required to reduce 0.2 mole of\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) to \(\mathrm{Cr}^{+3}\)
1 1.2
2 6
3 12
4 0.6
Explanation:
(a)\(\stackrel{+6}{\mathrm{Cr}_2} \mathrm{O}_7^{2-}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}\).
Change in oxidation state \(=+3\) per chromium atom.
1 mole of \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) required \(=6 e^{-}\)
\(\therefore \quad 0.2\) moles of Cr required
\(=0.2 \times 6=1.2 \text { moles of } e^{-\mathrm{s}}\)
Karnataka CET 2019
CHEMISTRY(KCET)
285309
For the redox reaction,
\(\begin{aligned}
& x \mathrm{MNO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+z \mathrm{H}^{+} \\
& \quad \rightarrow \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
The values of \(x, y, m\) and \(n\) are
1 \(10,2,5,2\)
2 \(2,5,2,10\)
3 \(6,4,2,4\)
4 \(3,5,2,10\)
Explanation:
(b) The balanced reaction is given as
\(\begin{aligned}
2 \mathrm{MnO}_4^{-}+5 \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+6 \mathrm{H}^{+} & \rightarrow \\
& 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2+8 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Thus, \(x=2, y=5, m=2\) and \(n=10\)
285306
The oxidation number of nitrogen atoms in\(\mathrm{NH}_4 \mathrm{NO}_3\) are
1 \(-3,+5\)
2 \(+3,-5\)
3 \(-3,-3\)
4 \(+5,+5\)
Explanation:
(a)\(\mathrm{NH}_4 \mathrm{NO}_3\) is formed by \(\mathrm{NH}_4^{+}\)and \(\mathrm{NO}_3^{-}\). Let oxidation number of N is \(x\).
\(\begin{aligned}
& x+4=+1 \\
& x=-3 \\
& \text { In } \mathrm{NO}_3^{-} \\
& x+3(-2)=-1 \\
& x=+5
\end{aligned}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285307
In which of the following cases a chemical reaction is possible?
1 \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon.
2 Conc.\(\mathrm{HNO}_3\) is stored in a platinum vessel.
3 Gold ornaments are washed with dil.HCl .
4 \(\mathrm{ZnSO}_4(\mathrm{aq})\) is placed in a copper vessel.
Explanation:
(a) When \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon, displacement reaction will takes place i.e., Cu displace Ag from \(\mathrm{AgNO}_3\) solution
\(\mathrm{Cu}+2 \mathrm{AgNO}_3 \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{Ag}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285308
The number of moles of electron required to reduce 0.2 mole of\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) to \(\mathrm{Cr}^{+3}\)
1 1.2
2 6
3 12
4 0.6
Explanation:
(a)\(\stackrel{+6}{\mathrm{Cr}_2} \mathrm{O}_7^{2-}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}\).
Change in oxidation state \(=+3\) per chromium atom.
1 mole of \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) required \(=6 e^{-}\)
\(\therefore \quad 0.2\) moles of Cr required
\(=0.2 \times 6=1.2 \text { moles of } e^{-\mathrm{s}}\)
Karnataka CET 2019
CHEMISTRY(KCET)
285309
For the redox reaction,
\(\begin{aligned}
& x \mathrm{MNO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+z \mathrm{H}^{+} \\
& \quad \rightarrow \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
The values of \(x, y, m\) and \(n\) are
1 \(10,2,5,2\)
2 \(2,5,2,10\)
3 \(6,4,2,4\)
4 \(3,5,2,10\)
Explanation:
(b) The balanced reaction is given as
\(\begin{aligned}
2 \mathrm{MnO}_4^{-}+5 \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+6 \mathrm{H}^{+} & \rightarrow \\
& 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2+8 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Thus, \(x=2, y=5, m=2\) and \(n=10\)
285306
The oxidation number of nitrogen atoms in\(\mathrm{NH}_4 \mathrm{NO}_3\) are
1 \(-3,+5\)
2 \(+3,-5\)
3 \(-3,-3\)
4 \(+5,+5\)
Explanation:
(a)\(\mathrm{NH}_4 \mathrm{NO}_3\) is formed by \(\mathrm{NH}_4^{+}\)and \(\mathrm{NO}_3^{-}\). Let oxidation number of N is \(x\).
\(\begin{aligned}
& x+4=+1 \\
& x=-3 \\
& \text { In } \mathrm{NO}_3^{-} \\
& x+3(-2)=-1 \\
& x=+5
\end{aligned}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285307
In which of the following cases a chemical reaction is possible?
1 \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon.
2 Conc.\(\mathrm{HNO}_3\) is stored in a platinum vessel.
3 Gold ornaments are washed with dil.HCl .
4 \(\mathrm{ZnSO}_4(\mathrm{aq})\) is placed in a copper vessel.
Explanation:
(a) When \(\mathrm{AgNO}_3\) solution is stirred with a copper spoon, displacement reaction will takes place i.e., Cu displace Ag from \(\mathrm{AgNO}_3\) solution
\(\mathrm{Cu}+2 \mathrm{AgNO}_3 \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{Ag}\)
Karnataka CET 2020
CHEMISTRY(KCET)
285308
The number of moles of electron required to reduce 0.2 mole of\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) to \(\mathrm{Cr}^{+3}\)
1 1.2
2 6
3 12
4 0.6
Explanation:
(a)\(\stackrel{+6}{\mathrm{Cr}_2} \mathrm{O}_7^{2-}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}\).
Change in oxidation state \(=+3\) per chromium atom.
1 mole of \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) required \(=6 e^{-}\)
\(\therefore \quad 0.2\) moles of Cr required
\(=0.2 \times 6=1.2 \text { moles of } e^{-\mathrm{s}}\)
Karnataka CET 2019
CHEMISTRY(KCET)
285309
For the redox reaction,
\(\begin{aligned}
& x \mathrm{MNO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+z \mathrm{H}^{+} \\
& \quad \rightarrow \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
The values of \(x, y, m\) and \(n\) are
1 \(10,2,5,2\)
2 \(2,5,2,10\)
3 \(6,4,2,4\)
4 \(3,5,2,10\)
Explanation:
(b) The balanced reaction is given as
\(\begin{aligned}
2 \mathrm{MnO}_4^{-}+5 \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+6 \mathrm{H}^{+} & \rightarrow \\
& 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2+8 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Thus, \(x=2, y=5, m=2\) and \(n=10\)