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Which of the following has least first ionization enthalpy?

The element $X,Y,Z$ and $T$ have the indicated electronic configurations. Starting with the innermost shell, which is the most metallic element:
$X:2,8,4$
$Y:2,8,8$
$Z:2,8,8,1$
$T:2,8,8,7$

Consider a strong acid HA having a pH=4 mixed in an equal volume with another solution of strong acid HB to give a resultant pH of 3. Then the $H^{+}$ concentration of solution containing strong acid HB is :

Find the potential of a half - cell that has the reaction, $A{g}_{2}S+2e^{-}\to 2Ag+S^{2-}$ in a solution buffered at pH = 3 and which is also saturated with 0.1 M $H_{2}S$.
For $H_{2}S:K_1={10}^{-8}$ and $K_2=2\times {10}^{-13},K_{sp}\left(A{g}_{2}S\right)=2\times {10}^{-48},E_{A{g}^{+}|Ag}^0=0.8V$

$Al\&Ga$ have nearly the same constant radii because of

If an electron in hydrogen atom jumps from an orbit of level n = 3 to an orbit of level n = 2, then emitted radiation has a frequency equal to,

A process cycle ABCA consisting of isothermal expansion AB, isobaric compression BC and adiabatic compression CA, for 1 mole of ideal gas is shown below. (Given: $T_A=T_B=400K,\lambda =1.5;(2{)}^{\frac{1}{3}}=1.26)$

$\begin{array}{cccccc}& ColumnI& & ColumnII& & ColumnIII\\ \left(I\right)& \Delta Q=-247.5R& \left(i\right)& \Delta U=165R& \left(P\right)& \Delta W=165R\\ \left(II\right)& \Delta Q=247.5R& \left(ii\right)& \Delta U=-165R& \left(Q\right)& \Delta W=400R\left(ln2\right)\\ \left(III\right)& \Delta Q=400R\left(ln2\right)& \left(iii\right)& \Delta U=82.5R& \left(R\right)& \Delta W=-165R\\ \left(IV\right)& \Delta Q=zero& \left(iv\right)& \Delta U=zero& \left(S\right)& \Delta W=-82.5R\end{array}$

Which of the following is correct for process $B\to C$?

Which of the following sets of molecules have different shape but same hybridisation of the central atoms?

Match $List-I$ (Monomer) with $List-II$ (Polymer) and select the correct answer using the codes given below the lists:
$\begin{array}{cc}\text{List-I}& \text{List-II}\\ \left(I\right)\text{Hexamethylenediamine}& \text{A.Bakelite}\\ \left(II\right)\text{Phenol}& \text{B. Dacron}\\ \left(III\right)\text{Phthalic acid}& \text{C. Glyptal}\\ \left(IV\right)\text{Terephthalic acid}& \text{D. Melamine}\\ & \text{E. Nylon-6,6}\end{array}$

The area of cross section of a large tank is 0.5 m². It has an opening near the bottom having area of cross section 1 cm². A load of 20 kg is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is 50 cm above the bottom. Take g = 10 m s^-2.

In which of the following situations, the heavier of the two particles has smaller de Broglie wavelength? The two particles

p block , s block, d block elments is usally paramagnetic or diamagnetic

A plant virus is found to consist of uniform cylindrical particles of 150A° in diameter and 5000°A long . The specific volume of the virus is 0.75cm^3/g . If the virus is considered to be a single particle , find its molecular weights.[v=πR^2.L]

Electronic configuration of four elements A, B, C, and D are given below
A. $1s^{2}2s^{2}2p^6$ B. $1s^{2}2s^{2}2p^4$ C. $1s^{2}2s^{2}2p^{6}3s^1$
D. $1s^{2}2s^{2}2p^5$
Whilch of the following is the correct order of increasing tendency to gain electron?
(a) A < C <B <D (b) A < B < C < D (c) D <B < C < A (d) D < A < B <C

0.24 g of a volatile substance upon vaporization, gives 45 ml of vapour atSTP. The vapour density of the substance is

The most suitable reagent for the conversion of $R-C{H}_2-OH\to R-CHO$ is

The geometry of electron pairs around S in $S{F}_6$ is

During the change of state of matter from liquid to gas, how does the temperature vary with time?

Out of the following which will show geometrical isomerism as facial and meridional isomers?

Structure of I₃^-

The ratio of the absolute masses and the charges of a proton to a neutron respectively are:

Electrolysis of fuel NaCl will give

OPTIONS​

1) Na 3) NaClO

2) NaCl 4) NaClO₃

Why do the metal oxide having more oxidation number more acidic

10 ml of 1M Bacl2 solution and 5ml 0.5 M K2SO4 are mixed together to precipitate out BaS04 .The amount of BaSO4 precipited will be

a) 0.005.mol b) 0.00025mol

c)0.025mol. c)0.0025 mol

Octet rule is applicable to which of the following species?

The compound which has zero dipole moment out of $C_6{H}_6$, $CO$ and $N{H}_3$ is .

A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be $(h=6.6\times {10}^{-34}Js)$

ice crystallises in a hexagonal lattice.at the low temperatures at which the structure was determined, the lattice constants were a= 4.53 Angstroms ; b=7.41 Angstorms .How many H molecules are contained in a unit cell

ans =4 ?

The equivalent weight of a divalent metal is $W$. The molecular weight of its chloride is:

The bond order increases in which of the following conversions?

Which one is not correct statement?

Does oxidation number method and half reaction method/ion electron method provide same result?

Even though air contains $78\%$ nitrogen, $20\%$ oxygen by volume and formation of $NO$ is thermodynamically feasible, they do not combine to form $NO$. This is because

Column 1: Compound

Column 2: Oxidation state

Column 3: Type of linkage

$\begin{array}{cccccc}& \text{Column 1}& & \text{Column 2}& & \text{Column 3}\\ \left(I\right)& N{a}_2{S}_2{O}_3& \left(i\right)& +5& \left(P\right)& S-O-S\\ \left(II\right)& N{a}_2{S}_4{O}_6& \left(ii\right)& -2& \left(Q\right)& -S-S-\\ \left(III\right)& H_2{S}_2{O}_7& \left(iii\right)& +6& \left(R\right)& -O-O-\\ \left(IV\right)& H_2{S}_2{O}_8& \left(iv\right)& +4& \left(S\right)& S=S\end{array}$

The only correct combination for Marshall’s Acid.

The increasing order of acidic nature of the following oxidies is

In the reaction $2X+B_2{H}_6\to 2\left[B{H}_{3}X\right]$ the amine (s) $X$ is (are):

The value of $I{P}_1$, $I{P}_2$, $I{P}_3$ and $I{P}_4$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

Which of the following structures is enantiomeric with the molecule (A) given below?

When chlorine gas is passed through an aqueous solution of a potassium halide in the presence of chloroform a violet colouration is obtained. On passing more of chlorine water, the violet colour disappears and solution becomes colourless. This test confirms the presence of which of the following ions?

Why the lattice energy of LiF is higher than the other metallic fluoride?

How does the co-ordinate covalent bond between BF3 and NH3 form?

Arrange the compounds in an increasing order of their basic strengths: