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If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction.

The numerical value of energy involved in the given process $K\to K^{-}$ is less than that of which of the following processes?

An element $X$ that has the configuration $n{s}^{2}n{p}^1$ is present in a short period of the modern periodic table. The formula and nature of its oxide is:

If $I_{Mg}=\text{First ionization energy of Mg}$

$I{I}_{Mg}=\text{Second ionization energy of Mg}$

$I_{Na}=\text{First ionization energy of Na}$

$I{I}_{Na}=\text{Second ionization energy of Mg}$

Choose the correct option:

1. 0.236

In $C+H_{2}O\to CO+H_2$
$H_{2}O$ acts as

Which one of the following groups shows maximum -I effect?

The atomic numbers of $V,Cr,Mn$ and $Fe$ are respectively $23,24,25\text{and}26$. Which one of these is expected to have the highest second ionization energy ?

The edge length of the unit cell of a bcc lattice of a metal is $350\text{pm}$

What is the length of the body diogonal?

[1 Mark]

Iodine molecule dissociates into atoms after absorbing light of 4500 $\stackrel{o}{A}$ . If one quantum of radiation is absorbed by each molecule. Calculate the kinetic energy of iodine atoms (bond energy of $I_2=240kJmo{l}^{-1}$)

Which of the following will not give Hofmann-Bromamide reaction ?

In a reaction between A and B the initial rate of reaction $\left(r_0\right)$ was measured for different initial concentrations of A and B as given below.
$\begin{array}{cccc}A/mol{L}^{-1}& 0.20& 0.20& 0.40\\ B/mol{L}^{-1}& 0.30& 0.10& 0.05\\ x_0/mol{L}^{-1}{s}^{-1}& 5.07\times {10}^{-5}& 5.07\times {10}^{-5}& 1.43\times {10}^{-4}\end{array}$
What is the order to the reaction with respect to A and B?

Which of the following will react at faster rate with acetone to give a product containing

A block of mass m is connected to a spring of spring constant K as shown in figure. The frame in which block is placed is given an acceleration 'a' towards left. Neglect friction between block and frame walls. The maximum velocity of the block relative to frame is

Which of the following curves may represent the energy of an electron in a hydrogen atom as a function of principal quantum number $n$.

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_______ gave the continental drift theory.

Calculate the $H^{+}$ ion concentration of a 0.01 N weak monobasic acid. The value of dissociation constant is $4.0\times {10}^{-10}$.

The order of basicity among the following compounds is:

Select the basic strength order of following molecules.

(I)

(II)(III)

Which pair of elements can from multiple bond with itself and oxygen?

Which has the maximum atomic radius-

In case of noble gases the general trend in the melting points and boiling points, down the group, is

Consider a small surface area of 1 $m{m}^2$ at the top of a mercury drop of radius 4.0 mm. Find the force exerted on this area (a) by the air above it (b) by the mercury below it and (c) by the mercury surface in contact with it. Atmospheric pressure = $1.0\times {10}^{5}Pa$ and surface tension of mercury = $0.465N{m}^{-1}$. Neglect the effect of gravity. Assume all numbers to be exact.

Formula of glucose is

Which of the following curves represents Henry’s law ?

The species having pyramidal shape is-

Sum of Nitrogen atoms in the monomers of nylon-6 and nylon-6,6 is 'x' and sum of carbon atoms in them is y then is

In an aqueous solution of barium nitrate, the $\left[N{O}_3^{-}\right]$ is 0.080 M. This solution can be labeled as