AP EAPCET 2021 - 19th August Evening Shift

Assuming that the incident radiation is
capable of ejecting photoelectrons from all
the given metals, the lowest kinetic energy of
the ejected photoelectron is observed with
which of the given metals?

If the energies of two light radiations \(E_1\) and \(E_2\) are \(25 \mathrm{~eV}\) and \(100 \mathrm{~eV}\) respectively, then their respective wavelengths \(\lambda_1\) and \(\lambda_2\) would be in the ratio \(\lambda_1: \lambda_2\)

Assertion (A) An optically active amino
acid can exist in three forms depending on
the pH of the solution.
Reason (R) Amino acids contain both acidic
and basic groups, they exist as Zwitter ion in aq. medium, anionic form in acidic medium
a...

Which compound among the following has
the highest dipole moment?

How many among the given species have a bond order of 0.5 ?
\(\mathrm{H}_2^{+}, \mathrm{He}_2^{+}, \mathrm{He}_2^{-}, \mathrm{B}_2^{+}, \mathrm{F}_2^{-}, \mathrm{Be}_2^{2-}\)

Match the following.

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The structure of diborane B\(_2\)H\(_6\) is given
below. Identify the bond angles of x and y. In
diborane, ........... are commonly known as
banana-bonds.

The incorrect statement(s) among the following is/are

Due to \(p \pi-p \pi\) bonding interactions, nitrogen for \(\mathrm{N}_2\). But phosphorus forms .................. and does not form a diatomic molecule.

Identify the incorrect statements among the following?
(i) \(\mathrm{SF}_6\) does not react with water.
(ii) \(\mathrm{SF}_6\) is \(s p^3 d\) hybridised.
(iii) \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) is a linear ion.
(iv) There is no \(\pi\)-bon...

Using the data provided, find the value of equilibrium constant for the following reaction at \(298 \mathrm{~K}\) and \(1 \mathrm{~atm}\) pressure.
$$\begin{aligned}
\mathrm{NO}(g)+\frac{1}{2} \mathrm{O}_2(g) \rightleftharpoons & \mathrm{NO...

The electronic configuration of \(\mathrm{Fe}^{3+}\) is (atomic number of \(\mathrm{Fe}=26\) )

The magnetic moment of Fe\(^{2+}\) is ........ BM.

Which of the following statement is not correct?

At \(291 \mathrm{~K}\), saturated solution of \(\mathrm{BaSO}_4\) was found to have a specific conductivity of \(3.648 \times 10^{-6} \mathrm{ohm}^{-1} \mathrm{~cm}^{-1}\) and that of water being used is $$1.25 \times 10^{-6} \mathrm{ohm}^{...

Find the emf of the following cell reaction. Given, \(E_{\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}}^{\Upsilon}=-0.72 \mathrm{~V}\) and \(E_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\Upsilon}= -0.42 \mathrm{~V}\) at \(25^{\circ} \mathrm{C}\) is $$\mathrm{...

For \(\mathrm{C{r_2}O_7^{2 - } + 14{H^ + } + 6{e^ - }\buildrel {Yields} \over \longrightarrow 2C{r^{3 + }} + 7{H_2}O,{E^\Upsilon } = 1.33}\) V at \([C{r_2}O_7^{2 - }] = 4.5\) millimole, \([C{r^{3 + }}] = 1.5\) millimole and \(E = 1.067\) V...

Which among the following has the highest
concentration of PAN?

The product formed when a hydrocarbon \(X\) of molecular formula \(\mathrm{C}_6 \mathrm{H}_{10}\) is reacted with sodamide is subjected to ozonolysis, followed by hydrolysis with \(\mathrm{Zn} / \mathrm{H}_2 \mathrm{O}_2\) and upon further ...

Identify the product of the following reaction.

Calculate the pOH of 0.10 M HCl solution.

Which among the following pairs is not an acidic buffer?

What is the IUPAC name of \(\mathrm{CH}_3 \mathrm{CH}\left(\mathrm{CH}_2 \mathrm{CH}_3\right) \mathrm{CHO}\) ?

The IUPAC name of diacetone alcohol is.

Which condition is not satisfied by an ideal solution?

A solution of urea (molar mass \(60 \mathrm{~g} \mathrm{~mol}^{-1}\) ) boils at \(100.20^{\circ} \mathrm{C}\) at the atmospheric pressure, if \(K_f\) and \(K_b\) for water are 1.86 and \(0.512 \mathrm{~K}\) \(\mathrm{kg} \mathrm{mol}^{-1}\)...

The element with outer electronic configuration \((n-1) d^2 n s^2\), where \(n=4\), would belong to

Choose the correct option regarding the following statements
Statement 1 Nitrogen has lesser electron gain enthalpy than oxygen.
Statement 2 Oxygen has lesser ionisation enthalpy than nitrogen.

Among the given configurations, identify the element which does not belong to the same family as the others?

Which statements among the following are correct about helium?
(i) Liquid helium is used to sustain powerful superconducting magnets.
(ii) Liquid helium is useful to carry low temperature experiments.
(iii) It is a heavy gas.
(iv) It is a f...

For the redox reaction
\(\mathrm{MnO}_4^{-}+\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}\),
the correct coefficients of the reactants for the balanced reaction are resp...

Assertion (A) The colour of old lead paintings can be restored by washing them with a dilute solution of \(\mathrm{H}_2 \mathrm{O}_2\).
Reason (R) Hydrogen peroxide reduces \(\mathrm{PbS}\) to \(\mathrm{Pb}\).

In the preparation of baking soda, H\(_2\)O and CO\(_2\) in ratio ......... is used to react with Na\(_2\)CO\(_3\).

The fcc crystal contains how many atoms in
each unit cell?

If 0.2 moles of sulphuric acid is poured into
250 mL of water, calculate the concentration
of the solution.

Among the following the maximum deviation from ideal gas behaviour is expected from

Among the following, in which type of chromatography, both stationary and mobile phases are in liquid state?

The protective power of a lyophilic colloidal sol is expressed in terms of

Two flasks \(A\) and \(B\) have equal volumes. \(A\) is maintained at \(300 \mathrm{~K}\) and \(B\) at \(600 \mathrm{~K}\). Equal masses of \(\mathrm{H}_2\) and \(\mathrm{CO}_2\) are taken in flasks \(A\) and \(B\) respectively. Find the ra...

When the temperature of 2 moles of an ideal
gas is increased by 20\(^\circ\)C at constant pressure.
Find the work involved in the process.

Given, \(f(x)=x^3-4x\), if x changes from 2 to 1.99, then the approximate change in the value of \(f(x)\) is

If the curves \(\frac{x^2}{a^2}+\frac{y^2}{4}=1\) and \(y^3=16 x\) intersect at right angles, then \(a^2\) is equal to

Let \(x\) and \(y\) be the sides of two squares such that, \(y=x-x^2\). The rate of change of area of the second square with respect to area of the first square is

If \(f^{\prime \prime}(x)\) is a positive function for all \(x \in R, f^{\prime}(3)=0\) and \(g(x)=f\left(\tan ^2(x)-2 \tan (x)+4\right)\) for \(0 < x <\frac{\pi}{2}\), then the interval in which \(g(x)\) is increasing is

Given, two fixed points \(A(-2,1)\) and \(B(3,0)\).
Find the locus of a point \(P\) which moves such that the angle \(\angle A P B\) is always a right angle.

The equations of the tangents to the circle \(x^2+y^2=4\) drawn from the point \((4,0)\) are

If \(P(-9,-1)\) is a point on the circle \(x^2+y^2+4 x+8 y-38=0\), then find equation of the tangent drawn at the other end of the diameter drawn through \(P\)

Find the equation of a circle whose radius is 5 units and passes through two points on the \(X\)-axis, which are at a distance of 4 units from the origin

If a foot of the normal from the point \((4,3)\) to a circle is \((2,1)\) and \(2 x-y-2=0\), is a diameter of the circle, then the equation of circle is

The length of the tangent from any point on the circle \((x-3)^2+(y+2)^2=5 r^2\) to the circle \((x-3)^2+(y+2)^2=r^2\) is 16 units, then the area between the two circles in square units is