Explore topic-wise InterviewSolutions in .

We know according to gases equation PV=nRTnow take log both side log(PV)=log (nRT)logP +logV=log (nRT)logP= (-1) logV +log (nRT)

question given temperature is constant and mass is also constant hence mole is constant , its mean nRT is constant .so, log (nRT) is constant now you see logP=(-1) logV+log(nRT)just like y=mx+cwhere y =logPx=logVc=log (nRT)and m=-1here m is slope of equation so, slope =-1

Because that set of atoms is more stable in that configuration, if an extra electron is available. The “octet rule” says that an atom is more stable if it has filled outermost s and p orbitals. There is one s, and 3 p’s, and each orbital holds 2 electrons, so eight is the good number. Since nitrogen starts with 5 and oxygen starts with 6, by sharing pairs they form bonds and get almost up to 8, but there is an odd number and it is what we call a radical—fairly unstable, prone to stealing a single electron from another molecule (creating another radical, and so on—this kind of chain reaction is how we almost destroyed the ozone layer with a small amount of chemicals.) If there happens to be surplus electron around, NO2 is stabilized by adding it on. And that is why nitrite exists and why its charge is -1.

NaCN ↔ Na++ CN-

Here pKb = 4.7

⇒ -logKb = 4.7

Hence Kb = 1.99 × 10-5

Now Kb= [Na][CN]/ [NaCN]

As [NaCN] = 0.5 M

[CN][Na] = 0.5 × 1.99 × 10-5

As [CN] = [Na]

Therefore, [CN]2= 9.97 × 10-5

Hence the concentration of [CN-] = 3.15 × 10-3

Now pOH = -log{3.15 × 10-3}

pOH = 2.5

Therefore pH = 14 - 2.5 = 11.49

please send image with complete question

There is always a tendendy of atoms in the molecules to attain most lowest oxidation state, because lower oxidation state provide more stability to that particular atom in the molecule. In NO2 the oxidation state of Nitrogen is +2 hence it always makes an effort to reduce it further to +1 or better to 0. Therefore it combines with another NO2 molecule and attain oxidation state of +1 from +2 (earlier). This is the reason that NO2 dimerise

According to Graham' s Law , rate of diffusion is inversely proportional to the square root of its molecular weight.

therefore......

Let m1be the mass of the unknown gasm2is the mass of Cl2r1= rate of diffusion of the unknown gasr2= rate of diffusion of Cl2

(i) Hence, m1 < m2=> Cl2 is heavier than unknown gas

Now refer to the attachment...

Theexcretory systemis a passive biological system that removes excess, unnecessary materials from thebody fluidsof anorganism, so as to help maintain internal chemicalhomeostasisand prevent damage to the body. The dual function of excretory systems is the elimination of thewaste productsofmetabolismand to drain the body of used up and broken down components in a liquid and gaseous state. In humans and otheramniotes(mammals,birdsandreptiles) most of these substances leave the body asurineand to some degree exhalation, mammals also expel them throughsweating.

Ans :- During summer months the temperature remains high owing to which lactobacillus increases in milk resulting formation of lactic acid, minimizing the basic pH of milk.

This is the reason why a milkman adds baking soda to increase the overall pH of the milk, since baking soda is a base and helps to neutralize the milk in summers.

A.efflorescence is the answee

Efflorescence is a phenomenon where certain crystalline salts lose part or all of their water of crystallization when exposed to the atmosphere to form the anhydrous salts or what is called lower dehydrate. An example of efflorescent salt is is washing soda (sodium carbonate decahydrate) that loses nine out of its ten molecules of water of crystallization when exposed to the atmosphere.

Na2CO3.10H2O(s) → Na2CO3.H2O(s) + 9H2O(g)

visible effect... clear glassy crystals fall apart to white powder.

it is called efflorescence that is when some water molecules is left behind in the compoundand some evaporate in contact with air

Thebrainis protected by the skull (cranium), cerebrospinal fluid and 3 protective membranes (Meninges). Thespinal cordis protected similarly but with vertebrae instead of the cranium

Meningesare formed by threetissuemembranes that are primarily known as wrappers of the brain. They consist ofdura mater, arachnoid andpia mater. Thedura materor pachymeninx (pachy-thick) is the outer membrane and forms a sac that envelops the other meningeal layers

Ans :- Option (C) NaHCO3 is correct.

The chemical name forbaking powderis sodium hydrogencarbonate. It has the chemicalformula NaHCO3.

PLEASE LIKE THE ANSWER

(c) Nahco3 baking pawdar ke anusutr (c) Nahco3 correct ✅✔ answare

more real ke liye sampark kare

कॉस्टिक सोडा (Caustic Soda) का रासायनिक नाम : सोडियम हाइड्रॉक्साइड (NaOH)

(A) is correct option

caustic soda having molecular formula NaOH

We know,

PV=nRT

V=nRT/P

V= 1×0.0821×373/1=30.6L=30.6×10-3m3

Volume of liquid water can be taken negligible and thusΔV=30.6L

W=-PΔV=-101325×30.6×10-3m3=-3100J

Negative sign indicates that work is done by the system.

We know,

PV=nRT

V=nRT/P

V= 1×0.0821×373/1=30.6L=30.6×10-3m3

Volume of liquid water can be taken negligible and thusΔV=30.6L

W=-PΔV=-101325×30.6×10-3m3=-3100J

Negative sign indicates that work is done by the system.

option 4

b...na2o2

TheGanga action planwas, launched by Shri Rajeev Gandhi, the then Prime Minister of India on 14 Jan. 1986 with the main objective of pollution abatement, to improve the water quality by Interception, Diversion and treatment of domestic sewage and present toxic and industrial chemical wastes from identified grossly ..

The Ganga action plan was, launched byShri Rajeev Gandhi, the then Prime Minister of India on 14 Jan. 1986 with the main objective of pollution abatement, to improve the water quality by Interception, Diversion and treatment of domestic sewage and present toxic and industrial chemical wastes from identified grossly polluting units entering in to the river. The other objectives of the Ganga Action Plan are as under.

Control of non-point pollution from agricultural run off, human defecation, cattle wallowing and throwing of unburnt and half burnt bodies into the river.

Research and Development to conserve the biotic, diversity of the river to augment its productivity.

New technology of sewage treatment like Up-flow Anaerobic Sludge Blanket (UASB) and sewage treatment through afforestation has been successfully developed.

Rehabilitation of soft-shelled turtles for pollution abatement of river have been demonstrated and found useful.

Resource recovery options like production of methane for energy generation and use of aquaculture for revenue generation have been demonstrated.

To act as trend setter for taking up similar action plans in other grossly polluted stretches in other rivers.

The ultimate objective of the GAP is to have an approach of integrated river basin management considering the various dynamic inter-actions between abiotic and biotic eco-system.

Precipitation is formed

Double decomposition reaction

bacl2+na2so4 = baso4 + nacl

Formula unit mass: The formula unit mass of a substance is the sum of the atomic masses of all atoms in a formula unit of a compound. The term ‘formula unit’ is used for those substances which are made up of ions.Formula unit mass of Na2O = 2 × 23 +16 =46 + 16 =62u

Answer:

The atomic masses of mostelementsare fractional because they exist as a mixture ofisotopesof different masses.

Explanation:

Most elements occur as a mixture of isotopes of different masses. The fractional atomic masses arise because of this mixture.

Avg. mass = total mass of all atoms/number of atoms.

Before we calculate the average mass of atoms, let's use an analogy.

cations are the positively charged elementsAnions are the negetively charged elements.

Anionvs.Cation. Ions result from atoms or molecules that have gained or lost one or more valence electrons, giving them a positive or negative charge. Those with a negative charge are calledanionsand those with a positive charge are calledcations.

For highly ionic compound such as KCl, lattice energy is directly proportional tomelting point.Since, it has higher charge to size ratio, hence, it has a higher melting point.

thanks

Ans :- This alkali metal hydride is primarily used as a strong, yet combustible base in organic synthesis. NaH is representative of the saline hydrides, meaning it is a salt-like hydride, composed of Na+and H−ions, in contrast to the more molecular hydrides such as borane, methane, ammonia and water.

molarity =no of moles/volume of sol in litreno of moles=0.02*50*10^-3=10^-3molehence no of molecules=10^-3*6.023*10^23=6.023*10^20

An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions

Theelectrochemical series, also known as theactivity series, is a list of metals listed in order of decreasing reactivity or in order of decreasing ease of oxidation. The metals at the top of the series, such as the alkali metals and the alkaline earth metals, are more reactive or are most easily oxidized than the metals found at the bottom of the series. This basically means that they can react more easily to form compounds. These metals at the top of the activity series are calledactive metals.

application of electrocheemical series

A series in which the reduction electrode potentials of various electrodes have been arranged in the increasing order (downwards) is called Electrochemical Series .

The standard reduction potential of hydrogen is zero.The electrodes above hydrogen have negative reduction potential while those place below it have positive reduction potential and vice-versa.

To understand the importance and application of Electrochemical series we have to study about Oxidation,Reduction and Standard Reduction Potential.

An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions.

Electrochemical cells are constructed of various materials, such as the wire, the solutions themselves, and the containers. All of these materials cause the cell to have a property calledinternal resistance. As the current flows in the cell over time, this resistance causes the cell to lose some of its potential, orvoltage. What remains of the cell's voltage after subtracting the voltage lost due to internal resistance is called theterminal potential difference. This is expressed as:

In this equation, Vt.p.d.is the terminal potential difference,emfis the electromotive force, or ideal amount of energy (in volts) provided by the cell before there is resistance,Iis the current in amperes, andris the internal resistance in ohms.