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$Mg$ can reduce $N{O}_3^{-}$ to $N{H}_3$ in basic medium.

$N{O}_3^{-}\left(aq\right)+Mg\left(s\right)+H_{2}O\to Mg\left(OH{)}_2\right(s)+O{H}^{-}(aq)+N{H}_3(g)$

A $25.0mL$ sample of $N{O}_3^{-}$ solution was treated with $Mg\left(s\right)$. The $N{H}_3\left(g\right)$ was passed into $100mL$ of $0.15NHCl$.

The excess of $HCl$ required $32.10mL$ of $0.10NNaOH$ for neutralization. What was the molarity of $N{O}_3^{-}$ ions in the original sample?

A compound X with molecular formula C₃H₈O can be oxidised to a compound Y with the molecular formula C₃H6O_2. X is most likely to be [MP PMT 1991]

The Edison storage cell is represented as :

Fe(s)/FeO(s)/KOH(aq)/Ni₂O₃ (s)/Ni(s)

The half-cell reactions are:

$N{i}_2{O}_3\left(s\right)+H_{2}O\left(l\right)+2e^{-}\to 2NiO\left(s\right)+2O{H}^{-};E^{\circ }+0.40$

$FeO\left(s\right)+H_{2}O\left(l\right)+2e^{-}\to Fe\left(s\right)+2O{H}^{-};E^{\circ }=-0.87$,

What is the maximum amount of electrical energy that can be obtained from one mole of Ni₂O₃ ?

Find the amount of water present, if the total number of protons is $1.8069\times {10}^{25}$.

Which one of the following elements, in its diatomic molecular state, has the least bond energy?

The solubility of $Mg(OH{)}_2$ in a particular buffer is found to be $0.95g{L}^{-1}.$ What is the pH of the buffer solution? $\left[K_{sp}\right(Mg\left(OH{)}_2\right)=1.8\times {10}^{-11}]$

Which of the following is the least stable?

Of the following, the one with the largest size is?

The correct order of dipole moment is _____

If we consider 1 and 2 as priority, then which of the following is Z?

Reactivity of Tertiary H, Secondary H and Primary H towards elimination is:

The integrating factor of the differential equation $\frac{dy}{dx}=ytanx-y^{2}secx$ is

[MP PET 1995; Pb. CET 2002]

For the reactions (i) $H_2\left(g\right)+C{l}_2\left(g\right)⟶2HCl\left(g\right)+xKJ$

(ii) $H_2\left(g\right)+C{l}_2\left(g\right)⟶2HCl\left(l\right)+yKJ$





Which of the following statements is correct?

The decreasing order of solubility of silver halides is:

What is the correct order of basic strengths of the given amines in aqueous medium?

The electrons which take part in order to exhibit variable oxidation states by transition metals are:

The most stable ion is:

For a reaction, $N_2{O}_5⟶2N{O}_2+\frac{1}{2}{O}_2$

Given:

$\frac{-d\left[N_2{O}_5\right]}{dt}=k_1\left[N_2{O}_5\right]$

$\frac{d\left[N{O}_2\right]}{dt}=k_2\left[N_2{O}_5\right]$

$\frac{d\left[O_2\right]}{dt}=k_3\left[N_2{O}_5\right]$

The relation between $k_1,k_2$ and $k_3$ are:

The enthalpy of formation of methane at constant pressure and $300K$ is $-75.83KJ$. What will be the heat of formation at constant volume? $(R=8.3J{K}^{-1}mo{l}^{-1}$)

Which of the following shows the correct order of increasing bond dissociation energies?

Which of the following reagents could be used to distinguish between prop-2-en-1-ol and propan-1-ol?

Osmotic pressure of 0.1 M solution of NaCl and Na₂SO₄ will be

Which of the following pairs does not have the same shape?

The % of dissociation of water at ${25}^{\circ }C$ is $1.9\times {10}^{-7}$ and density is $1.0gc{m}^{-3}$ The ionic constant for water is :

$C_6{H}_{14}$ has 2 tertiary carbon atoms. What would be its IUPAC name?

What hybridization is expected on the central atom of each of the following molecules?

(i) $Be{H}_2$

(ii) $C{H}_{2}B{r}_2$

(iii) $P{F}_6^{-}$

(iv) $B{F}_3$

Magnesium combines with nitrogen to form a nitride, which reacts with water to form a colourless gas. The gas is:

The density of an ideal gas at $298\text{K}$ and $1.0\text{atm}$ is found to be $1.25{\text{kg m}}^{-3}$. Density of the gas at $1.5\text{atm}$ and at $298\text{K}$ is:

An example of $p\pi -p\pi$ bonding is:

Match the weight of reactants given in column I with weight of products marked (?) given in column II.

The radius of first Bohr's orbit in H-atoms is $r_1$. The corresponding wavelength of an electron in 2nd orbit is:

The ionisation constant of phenol is higher than that of ethanol because

Which of the following molecules is not an odd electron species?

The strength of sigma bonds formed by the axial overlap of $s$ - or $p$ - orbitals of $2^{nd}$ shell of the participating atoms decreases as:

For a 3s - orbital

$\Psi \left(3s\right)=\frac{1}{a\sqrt{3}}{\left(\frac{1}{a_0}\right)}^{\frac{3}{2}}(6-6\sigma +{\sigma }^2){ϵ}^{\frac{-\sigma }{2}},$

Where $\sigma =\frac{2rZ}{3a_0}$

What is the maximum radial distance of node from nucleus is

The electronegativity of the following elements increases in the order of?

The most abundant elements by mass in the body of a healthy human adult are oxygen (61.4%), carbon (22.9%), hydrogen (10.0%) and Nitrogen (2.6%). The weight which a $75\text{kg}$ person would gain if all the ${}^{1}H$ atoms are replaced by ${}^{2}H$ atoms is:

$D_{2}O$ is used more in

Based on magic numbers, which nuclide is the most stable ?

$\begin{array}{cc}\text{List I}& \text{List II}\\ \text{A.}B{i}^{3+}⟶(BiO{)}^{+}& \text{p. Heat}\\ \text{B.}[Al{O}_2{]}^{-}⟶Al(OH{)}_3& \text{q. Hydrolysis}\\ \text{C.}Si{O}_4^{4-}⟶S{i}_2{O}_7^{6-}& \text{r. Acidification}\\ \text{D.}\left(B_4{O}_7^{2-}\right)⟶B(OH{)}_3& \text{s. dilution by water}\end{array}$

Principle quantum number directly reflects on

Which of the following options has only amphoteric oxides?

Which statement is not true for hydrogen?