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The alkene that exhibits geometrical isomerism is:

Which of the following elements has the maximum electron affinity?

The weight of 4 gram atoms of nitrogen is

Which carbocation is involved in the above reaction ?

Which of the following element is used in the treatment of cancer?

Considering the basic strength of amines in aqueous solution, which one has the smallest $p{K}_b$ value ?

From 320 mg. of $O_2$, $6.023\times {10}^{20}$ molecules are removed, the no. of moles remained are

A compound of vanadium has a magnetic moment of 1.73 BM. Vanadium chloride has the formula:

One gram mole of a gas at STP occupies 22.4L volume. This fact was derived from –

Which one of the following sets forms the biodegradable polymer ?

Which of the following is not an example of $+I$ group?

The fraction of volume occupied by the nucleus with respect to the total volume of an atom is:

Match the following.

$\begin{array}{cc}\text{Reaction}& \text{Degree of dissociation in terms of}\\ \text{(Homogeneous gaseous phase)}& \text{equilibrium constant}\\ \text{(a)}A\left(g\right)+B\left(g\right)\rightleftharpoons 2C\left(g\right)& \text{(p)}\left(\sqrt{K}\right)/(1+\sqrt{K})\\ \text{(b)}2A\left(g\right)\rightleftharpoons B\left(g\right)+C\left(g\right)& \text{(q)}\left(\sqrt{K}\right)/(2+\sqrt{K})\\ \text{(c)}A\left(g\right)+B\left(g\right)\rightleftharpoons C\left(g\right)+D\left(g\right)& \text{(r)}2K/(1+2K)\\ \text{(d)}AB\left(g\right)\rightleftharpoons \frac{A}{2}\left(g\right)+\frac{B}{2}\left(g\right)& \text{(s)}\frac{2\sqrt{K}}{1+2\sqrt{K}}\\ & \text{(t) K}\end{array}$

Oxidant and Reductanct in the following reactions are respectively

$10H^{+}\left(aq\right)+4Zn\left(s\right)+N{O}_3^{-}\left(aq\right)\to 4Z{n}^{2+}\left(aq\right)+N{H}_4^{+}\left(aq\right)+3H_{2}O\left(l\right)$

Bleaching powder is obtained by

The minimum amount of $A{g}_{2}C{O}_3\left(s\right)$ required to produce sufficient oxygen for the complete combustion of $C_2{H}_2$ which produces $11.2\text{L}$ of $C{O}_2$ at STP after combustion is:

(Molar mass of $Ag=108\text{g/mol}$)

$A{g}_{2}C{O}_{3\left(s\right)}\to 2A{g}_{\left(s\right)}+C{O}_{2\left(g\right)}+\frac{1}{2}{O}_{2\left(g\right)}$

$C_2{H}_2+\frac{5}{2}{O}_2\to 2C{O}_2+H_{2}O$

The increasing order for the magnitude of $e/m$ (charge/mass) for an electron (e), a proton (p) and a neutron (n) respectively is:

The correct structure for the compound 1,2-diethyl-1,8-dimethyl-5-propylcyclooctane is:

Different forms of silica such as quartz, tridymite and cristobalite are as follows:

Quartz $\stackrel{{870}^{\circ }C}{⟶}$ Tridymite $\stackrel{{1470}^{\circ }C}{\rightleftharpoons }$ Cristobalite

$\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$

The structure possessed in them is:

What is the ratio of time periods in the second orbit of the hydrogen atom $\left(T_H\right)$ to the fourth orbit of $H{e}^{+}$ ion $\left(T_{He}\right)$?

Which of the following compounds does not undergo nucleophilic

substitution reactions

[KCET 1998]

The $\left[H^{+}\right]$ of the resulting solution that is 0.01 M in acetic acid $(K_a=1.8\times {10}^{-5}M)$ and 0.01 M in benzoic acid. $(K_a=6.3\times {10}^{-5}M)$ will be:

Which one of the following is the electron deficient compound?

How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]

Which of the following leads to carbon -carbon double bond?

Which of the following dienes would be the most stable?

The maximum n-factor $\left(n_f\right)$ for $H_{3}P{O}_3$ and $H_{3}P{O}_4$ respectively is:

The structures of the σ-complex formed during the nitration of anisole would be:

The equilibrium constants $K_{p1}$ and $K_{p2}$ for the reactions $X\rightleftharpoons 2Y$ and $Z\rightleftharpoons P+Q$, respectively are in the ratio of $1:9$. If degree of dissociation of $X$ and $Z$ be equal then the ratio if total pressures at these equlibria is

In the Bragg's equation
for diffraction of X-rays, n represents for

[MP
PMT 2000]

The species that does not contain peroxide ion is

The compound that is the most difficult to protonate is:

The ratio of $\sigma$ and $\pi$ bonds in mesitylene is:

Calculate the solubility of a sparingly soluble compund $A_2{X}_3$ at ${25}^{\circ }C$.

The solubility product $K_{sp}$ of $A_2{X}_3$ is $1.08\times {10}^{-23}$ at the given temperature.

Which one of the following will produce a primary alcohol by reacting with CH₃Mgl [MP PET 1991]

Which one among the following is the strongest reducing agent?

$F{e}^{2+}+2e^{-}\to Fe(-0.44V)$

$N{i}^{2+}+2e^{-}\to Ni(-0.25V)$

$S{n}^{2+}+2e^{-}\to Sn(-0.14V)$

$F{e}^{3+}+e^{-}\to F{e}^{2+}(+0.77V)$

In the following skew conformation of ethane, $H^{\prime }-C-C-H^{\prime \prime }$ dihedral angle is

Which of the following is correct for a salt of weak acid and strong base?

Here C is the concentration of the salt.

In the manufacture of caustic soda by Castner-Kellner process, the by-products formed are:

The organic chloro compound, which shows complete stereochemical inversion during a $S_{N}2$ reaction, is

Match the elements given in List - I with their correct option given in List - II.



$\begin{array}{ccc}& \text{List-I}& \text{List - II}\\ \text{P.}& \text{4.5 m solution of}CaC{O}_3\text{of density 1.45 g/mL}& 1.\text{mole fraction of solute is 0.2}\\ \text{Q.}& \text{3 M 100 mL}HCl\text{mixed with 1 M 300 mL solution of}HCl& 2.\text{Molarity = 1.5 M}\\ \text{R.}& \text{14.5 m solution of}C{a}^{2+}& 3.\text{Molarity = 4.5 M}\\ \text{S.}& \text{5 m}NaOH\text{solution}& 4.\text{16.66 \% w/w of}NaOH\text{in the solution}\end{array}$

Specify the hybridization of the central atom in the following species $\{N_3^{-},NOCl,N_{2}O\}$.

When iron is rusted, it is:

Silicon dioxide is formed by the reaction of

At a constant temperature a gas is initially at 2 atm pressure. To compress it to $(\frac{1}{8}{)}^{th}$ of its initial volume, pressure to be applied is

Ribose and 2-deoxyribose can be differentiated by: