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option C is the correct answer.

as So4 will have -2 charge on it.. so on N2H5 there will be 1 +ve charge which makes it

(N2H5)+ now 2N +5 = +1 => 2N = +1-5 = -4 so N = -4/2 = -2.

CrO5 IS cromium with four peroxy oxygen and one cordinated oxygen.it is butterfly type structure .central cromium surround with 4 peroxy cyclic oxygen and 1 cordinate oxygen.in this oxidation number of cromium is+6!!!!!!

Buoyancyis the ability or tendency of an object to float in a fluid, which can be a liquid or a gas. This happens because fluid pressure increases with depth.

Oxidation state of nitrogen in N2O3 would be +3

Fluorineis the most electronegative element in the periodic table. For it toexhibitapositive oxidation state, a more electro negative element has to be bonded with it, which is very difficult to make happen.

+2.5 (No, this isn't an anomaly. Let me explain first)

Explanation:

First we need to calculate the oxidation state of S atom the usual way

S4O6(2-)

overall oxidation state = -2

[oxidation state of S x 4] +[oxidation state of O atom x 6]=-2

The oxidation state of oxygen is -2.

[oxidation state of S x 4]+[(-2)(6)] =-2

Let y be the oxidation state of S

Therefore, we can rewrite the equation as

[(y ) (4)] + [(-2) (6)] = -2

[(y ) (4)] + (-12) = -2

[(y ) (4)] = -2 + (+12)

[(y )(4)] = +10

y = +10/4

y = + 2.5

Here iodine is halogen so one iodine contain - 1 o. S then two iodine contains - 2

because air contains moisture this moisture can cause the setting of plaster of Paris into hard mass gypsum.

H3PO4 + 3 KOH → K3PO4 + 3 H2O

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answer:::::::::::::::a

a) is the correct answer

(a) is the correct answer

a is the right answer

C2H4 -> C3H6C4H6 -> C6H9

eV = electronvolt

kJ =kilojoule

1eV= 1.6021765×10⁻²²kJ

We first convert kJ to Ev

eV = 1312/(1.6021765×10⁻²²) = 8.18886 x 10^24

Then we convert to Ev/Atom by dividing byAvogadro’s number

eV/Atom = (8.18886 x 10^24)/6.022x10^23)

= 13.6

ionisation potential of alkali metal decreases down the ground..

so, ionisation of cs<k<li

also boron will have the highest ionisation out of all above..

so. the order is B>li>K

option 2.

Edge length, a = 400pm= 400×10-10cm

Since it isbccarrangement,Number of atoms in the unit cell,Z= 2Atomic mass of the element,M= 100g

Density =Z×M

a3×N0Density =2×100(400×10-10)3×6.022×10²³

= 5.18 g cm-3

reducing sugar is a chemical term for a sugar that acts as a reducing agent and can donate electrons to another molecule

Atomic no 19 is potassium and Atomic no 20 is Calcium ..Calcium has high metallic property as we move from left to right in the periodic table ... Atomic no 17 chlorine .....

Ca + Cl ---------> CaCl2

Hydride reacts with the carbonyl group, C=O, inaldehydesor ketones to give alcohols. The substituents on the carbonyl dictate the nature of the product alcohol. The acidic work-up converts an intermediate metal alkoxide salt into the desired alcohol via a simple acid base reaction.

This can be explained on the basis of z/e, where as z/e ratio increases, the size decreases and when z/e ratio decreases the size increases.

z is atomic number and e is number of electrons.

For Li+, z/e = 3/2 = 1.5

For F-, z/e = 9/10 = 0.9

For O2-, z/e = 8/10 = 0.8

For B3+, z/e = 5/2 = 2.5

Ans: OPTION C because it has the least z/e value.

Movementof the plants in response to am external stimulus is callednastic movement. The plant may grow towards or away from the stimulus. It is caused by differential turgor pressure or hormone build up in the plant parts exposed to the stimulus.Curvature movementsismovementof plant parts in or other direction.

Li-I should have more covalent character , Because I is less electronegative than F.

so, lesser the difference in electronegative , more will be the covalent character.

If the entropy of each element in some (perfect) crystalline state be taken as zero at the absolute zero of temperature, every substance has a finite positive entropy; but at the absolute zero of temperature the entropy may become zero, and does so become in the case of perfect crystalline substances.

hence Option A is correct.

which option

No, the molecularity can never be equal to zero or a fractional number. Molecularity is the number of molecules involved in each elementary reaction which may be different, the molecularity of each step may be different.

Na is the symbol of sodium.

na is the symbol of sodium

Chemicalsymbolsare used in much the same way. A chemicalsymbolis a shorthand method of representing anelement. Instead of writing out the name of anelement, we represent anelementname with one or two letters. As you know, the periodic table is a chemist's easy reference guid

Polymer is a large molecule made up of chains or rings of linked repeating subunits, which are called monomers. Polymers usually have high melting and boiling points. Because the molecules consist of many monomers, polymers tend to have high molecular masses.

There are different types of polymers depending on their origin, molecular structure, monomers, thermal response and mode of formation.

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Reaction of phenol with NaOH and CO2 to form salicylic acid is known as kolbe's reaction.

In this reaction phenol reacts with NaOH to form sodium phenoxide. Phenoxide ion is better ortho para director than phenol.

Hence CO2 attacks at ortho position of phenol and hence further sodium salt of salicylic acid is obtained, which on acidification forms salicylic acid.

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ii) is the right answer of the following

one carbon atom and two hydrogen atom any teo homologous figure is different

ii) is the right answer

There are three ways to join the models of six carbon atoms and fourteen hydrogen atoms to form different molecules of C6H14

First way is straight chain of carbon atoms

Second way is branched chain of carbon atoms

Third way is closed chain of carbon atoms.

Isomers of C6H14 are shown below. We can arrange the number of C atoms as follows:

Hexane2-methyl pentane3-methyl pentane2,2-dimethylbutane2,3-dimethyl butane

2.Limitations of Thomson’s Atomic Model

Thomson’s atomic model failed to explain how the positive charge holds on the electrons inside the atom. It also failed to explain an atom’s stability.

The theory did not mention anything about the nucleus of an atom.

It was unable to explain the scattering experiment of Rutherford.

1.

what you want to ask is not clear in this image. please provide sufficient information.

molecular mass of H2(1)(2)=2O2=2(8)=16C2H4=12(2)+1(4)=24+4=28

N2(g) +3H2(g) <=> 2NH3(g) so, reaction quotient ( Qc) = [NH3]²/[H2]³[N2]

Given , [ NH3 ] = 8.13 mol/20L { concentration = mole/volume } = 0.4065 M

[N2] = 1.57mol/20L = 0.0785 M[H2] = 1.92 mol/20L = 0.096 M

Qc = (0.4065M)²/(0.096M)³ (0.0785M) = 2.379 × 10³ /M²

Here, you can see that , Kc ≠ Qc , so the reaction is not in equilibrium. because Qc > Kc it means that the reaction will proceed in backward direction or in the direction of reactants .

Mass of one mole of Hydrogen= 1.008 gm

One mole of Hydrogen have 6.022 * 10^23 atoms

So, mass of 6.022 * 10^23 atoms of Hydrogen = 1.008 g

Therefore, mass of 1 atom of Hydrogen = 1.008/6.022*10^23= 1.66 * 10^-24 g

(A) is correct option

Atomic number = Number of protons = 3Mass number = Number of protons + number of neutrons =3 + 4 = 7Electronic configuration of the atom is 2,1(K,L)Hence, its valency is 1

Diffusion of molecules can take place. Hence, option (1) is correct.

FCC lattice has a conventional unit cell which is cubic with lattice point at corners and face centers and by specifying monotonic there is one atom at to each lattice point. There are 8 corners and six face centers one can simply count. The total no. of atoms in a unit cell to be

6+8=14

JohnDalton proposedthat all matter is composed of very small things which he called atoms. This was not a completely new concept as the ancient Greeks (notably Democritus) hadproposedthat all matter is composed of small, indivisible (cannot be divided) objects.

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