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why does an electron releasing group decrease polarity of bonds

The S- block elements are fcharacterissed by their larger atomic sizes lower ionisation enthalpies invariable +1 oxidation state and solubilities of their oxosalts. In the light of these features describe the nature of their oxides, halides and oxosalts.

The average kinetic energy of a gas at $-{23}^{\circ }C$ and 75 cm pressure is $5\times {10}^{-14}erg$ for $H_2$. The mean kinetic energy of the $O_2$ at ${227}^{\circ }C$ and 150 cm pressure will be

power company burns approximately 475 tons of coal per day to produce electricity if the sulphur content of the coal is 1. 2 percentage by weight how many tone SO_{​​​​​2} are dumped into the atmosphere each day?

Which of the following species is not a Lewis acid?

The systematic IUPAC name of the compound is?

The d-electron configuration of $C{r}^{2+},M{n}^{2+},F{e}^{2+}\text{and}C{o}^{2+}$ are $d^4$,$d^5$, $d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

With the increase in the concentration of the substance, the rate of the reaction

Which of the following is a molecule of a compound?

Which of the following compounds can be used to obtain free nitrogen?

A gaseous compound is composed of $85.7\%$ by mass carbon and $14.3\%$ by mass hydrogen. Its density is $2.5{\text{g L}}^{-1}$ and one mole of the gas occupies $44.8\text{L}$ of space at a particular temperature and pressure. Determine the molecular formula of the compound.

Which of the following is themally least stable ?

What is work function Φ?

Which of the following are common components of a photochemical smog?

Compound (A) produces $C{O}_2$ gas with $NaHC{O}_3$. Compound (A) also produces $H_2$ gas with metallic Na. Further, compound (A) gives a positive iodoform test. Structure of (A) is:

Based on the values of bond energies $(B.E.)$ given, ${\Delta }_f{H}^{\circ }$ of $N_2{H}_4\left(g\right)$ is:

Given : $N-N=159{\text{kJ mol}}^{-1};H-H=436{\text{kJ mol}}^{-1}N\equiv N=941{\text{kJ mol}}^{-1};N-H=398{\text{kJ mol}}^{-1}$

Primary alkyl halide
C₄H₉Br (a) reacted with alcoholic KOH to give
compound (b).Compound (b) is reacted with HBr to give (c) which is an
isomer of (a). When (a) is reacted with sodium metal it gives
compound (d), C₈H₁₈
which is different from the compound formed when n-butyl
bromide is reacted with sodium. Give the structural formula of (a)
and write the equations for all the reactions.

Column 1: Compound Column

Column 2: Oxidation state Column

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 in which the oxidation state of one of the S is zero:

In
a reaction between A and B, the initial rate of reaction (r₀)
was measured for different initial concentrations of A and B as given
below:

A/ mol L−1	0.20	0.20	0.40
B/ mol L−1	0.30	0.10	0.05
r0/ mol L−1 s−1	5.07 × 10−5	5.07 × 10−5	1.43 × 10−4

What
is the order of the reaction with respect to A and B?

What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature, hence use of a polymer?

Which of the following is the least stable?

The nucleophilic substitution of halide group with isocyanide group can be affected by reacting alky halide with

The rate constant for a first order reaction is $60s^{-1}$. How much time will it take to reduce the initial concentration of the reactant to its ${\frac{1}{6}}^{th}$ value?

In the following common emitter configuration, an $NPN$ transistor with current gain $b=100$ is used. The output voltage of the amplifier will be

Can 1 photon break more than 1 bonds?