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option 4 is wrong

as 1 mol of nitrogen weighs 14gm

and 0.5 mol of oxygen weighs 8gm.

but given in 2nd option that 2 moles of hydrogen=2*1=2 and helium weight =4 can you explain that what is reason that second option is not correct?

see option two is correct because, whenever it's hydrogen written consider it as molecule became hydrogen exists in gas molecule unless and until it's not specified don't consider to be atom

Iron does not react with water in the ordinary temperature. It reacts only with steam. When steam is passed over red-hot iron, iron (II,III) oxide and hydrogen gas are formed.

here is substitution reaction happened .Cu(s)+ 2AgNO3(aq)→2Ag(s)↓ + Cu(NO3)2(aq)

Easterification: Carboxylic acids -> esters The coversion is carried out using acid and alcohols. This is called the Fischer Esterification.

C2H5OH + CH3COOH --> CH3COOC2H5 + H2O

Activity: A few drops of H2So4 is added and glacial acetic acid. They are placed in a warm water bath for at least five minutes and the contents are poured into a beaker containing water. Observe the resulting mixture. The odor is sweet and the substance formed is Ethyl acetate. This reaction is called esterification reaction.

It would gradually turn into a solution of sodium carbonate.

The hydrogencarbonates (bicarbonates) are not as stable as the carbonates. In aqueous solution of a bicarbonate the following equilibrium exists:

2HCO3(-) + H2O = CO3(2-) + CO2 + H2O

On prolonged boiling of the solution, the bicarbonate will almost entirely get converted to the more stable carbonate with the liberation of carbon dioxide, just like it happens when the pure or dry salt is heated.

2NaHCO3 = Na2CO3 + CO2 + H2O

So, the solution becomes that of sodium carbonate on continued heating.

When chlorine is passed over dry slaked lime, bleaching powder will form.

equation ---: Ca(OH)2 + Cl2 ---> CaOCl2 + H2O.

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Answer:2) Formic acid

Explanation:CH2O2

2)Formic Acid ,CH2O2 or HCOOH

The acid containing carbon atom is Formic acid

Let the total mass of solution be 100gm so, mass of nitric acid = 69% of 100 = 69gm so, moles of nitric acid = 69/63 = 1.09

now mass of solvent is 100gm , so volume will be = mass/D = 100/1.41 = 70.92ml

now molarity will be = moles/volume in L = 1.09/0.07092= 15.36M

options C is the best answer

a) is the correct answer

A) is the right answer

mixing oxygen and hydrogen in the ratio of1:2

c ka riht answer sahi h

c is correct 1ratio 2 always

Passing steam through a red hot coke bed

a is the right answer.

A )is correct answer

A is the right answer

a is the right answer.

(a) is correct answer

option c is the answer of water gas produced

Option C is correct answer

a) is the correct answer

option A is the correct answer

because its reduction potential is higher than the hydrogen

This law states that mass can neither be created nor destroyed in a chemical reaction.

We are given that the mass ratio of Mg O is 3:2That means 3 gm of Mg will react with 2 gm of O to form MgO

since we have 6gm of Mg and excess of oxygen, Mg becomes a limiting reagent.

since 3 gm of Mg will react with 2 gm of O

6 gm of Mg will react with 4 gm of O .

But we have 12 gm of O , so 12-4=8 gm will be remaining.

Thats exactly according to the law of definite proportion given by Joseph Proust.

(a) Total number of molecules taking part in above reaction are 5 molecules. (2 molecules of Mg, one molecule of O2 and 2 molecules of MgO)

(b) 3 molecules of reactant taking part in reaction (2 molecules of Mg and one molecule of O2.

(c) Only one product MgO (magnesium oxide) formed in above reaction.

Bleaching powder is calcium oxychloride.

The chemical formula of Bleaching Powder is CaOCl₂ and its Chemical name is Calcium Oxychloride.

It is Prepared by Chlorine gas over dry slaked lime. Generally, this method is used in large-scale preparation of bleaching powder. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

Uses :

(i) Used for bleaching cotton and linen in the textile industry and wood pulp in the paper industry etc.

(ii) It is used for disinfecting the drinking water.

Bleaching powder or Calcium hypochlorite (CaOCl2) is mixed salt have two type of anion Cl-(chloride ion ) and OCl-(hypochlorite ion) .it act as oxidizing agent and bleaching agent

Bleaching powder has a lot of uses.

■ It is used for bleaching silk and wool.

It is mainly used as bleaching agent for cotton, linen and wood pulp.

Bleaching action of bleaching powder is due to oxidation and it is permanent

CaOCl2 + H2O——-Ca(OH)2 + Cl2

Cl2 + H2O——- O +2HCl

COLOR+O—-> COLORLESS

■ Bleaching powder is used as disinfectant and germicide especially in the sterilization of drinking water.

■ It is used for manufacturing of chloroform.

■ It is used as an oxidising agent in many chemical industries to obtain various chemical products.

C2H5OH+Cl2—->CH3CHO + CH2

equivalent weight = molecular mass/vlency =32/2=16

but I am not sure check it once

theriyathuuu sorrrrryyyy

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Energy conservation plays a significant role of lessening climate change. It helps the replacement of non-renewable resources with renewable energy. Energy conservation is often the most inexpensive solution to energy shortages, and it is more environmentally kind alternative to increased energy production.

Since, we have limited quantity of non-renewable energy resources available on earth, it is very important to preserve energy from our current supply or to utilize renewable resources so that it is also available to our future generations.

Energy conservation plays a very important role because utilization of non-renewable resources also impacts our environment. Specially, usage of fossil fuels supplies to air and water pollution such as carbon dioxide is produced when oil, coal and gas combust in power stations, heating systems, and engines of car.

The activity series ofmetalsis an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacementreactionsand ore extraction. It can be used to predict the products in similar reactions involving a different metal.

Electric charge is an amount of electricity that is held in or carried by something,which can be positive or negative, occurs in discrete natural units. Electric charge is a fundamental property of matter and the foundation for electricity.

Sir, if we do H.C.F pf that no. we get 45

answer of this question is 5

according to Euclid lemmar is greater or equal to 0 and less than qwhen r=0, HCF =q225>135135)225(1 135---------------- 90)135(1 90 ------ 45)90(2 90 ---------- 0225=1×135+90135=. 1×90+4590. =. 2×45+0HCF=. 45

HCF =45IS THE RIGHT ANSWER

45 is HCF of 225 and 135

HCF of this questioj is 45.

D) is correct option as

1 nanometer = 10-9 meter

Quantum theory is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the atomic and subatomic level. The nature and behavior of matter and energy at that level is sometimes referred to as quantum physics and quantum mechanics.

It gave the idea of quantum numbers.

option ATwo electron which are available in the same orbitals , must have opposite spins . Hencespin quantum numberdistinguished b/w the two electrons.

Theprincipal quantum number is the quantum numberdenoted by n and which indirectly describes the size of the electron orbital. It is always assigned an integer value (i.e., n = 1,2,3,...), but its value may never be 0. An orbital for which n = 2 is larger, for example, than an orbital for which n = 1.

Themagnetic quantum numberdistinguishes the orbitals available within a subshell, and is used to calculate the azimuthal component of the orientation of orbital in space. Electrons in a particular subshell (such as s, p, d, or f) are defined by values of ℓ (0, 1, 2, or 3).

An electron in an atom or ion has four quantum numbers to describe its state and yield solutions to the Schrödinger wave equation for the hydrogen atom. There are four quantum numbers: n - principal quantum number - describes the energy level. ℓ - azimuthal or angular momentum quantum number - describes the subshell.mℓor m - magnetic quantum number - describes the orbital of the subshell

msor s -spin quantum number- describes the spin

The quick vinegar process consist a series of upright wooden casks. Each wooden cask has a perforated false bottom and filled almost to the top with rough wooden shavings. There are holes drilled at the false bottom which allows air to be drawn up through the wooden shavings. On top of the cask is a wooden trough which dispenses small quantities of the mash intermittently over the shavings, trickling down over the filling material. And through the holes in the false bottom, the mash is transferred to the next casks. In each passing, the acidity is raised by about two per cent. The bacteria will settle on the wood shaving while the acidity is gradually raised.

Quicklime is a caustic compound known by its chemical name calcium oxide

a) When water is added to calcium oxide (quicklime), it will be converted to calcium hydroxide (slaked lime) with the liberation of enormous amount of heat. It is an exothermic reaction. Calcium hydroxide is an alkali.

b)At room temperature, thereactionoflime with carbon dioxideis very slow. ... Whenlimeis mixedwithwater, it formscalcium hydroxide, calledslaked lime. CaO(s) + H2O(l) ---> Ca(OH)2(s) Thereactionofcalcium hydroxide with carbon dioxideis faster, producing a mortar that hardens more quickly

Theangularmomentumquantum number, l, (also referred to as the secondaryquantum numberorazimuthal quantum number) describes the shape of the orbital that an electron occupies. The lowest possiblevalueof lis0, and its highest possiblevalue,dependingon theprincipal quantum number,isn - 1.

Number of subshells = 2l + 1= 2(3)+1= 7. Maximum number of electrons = 2*7 = 14

option D is correct

azimuthal no. is L and magnetic moment is √l(l+1)h/4π

option a is correct..for l = 1

m = -1,0,1

In the history of the periodic table, Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties.

This is because hydrogen's characteristics are very similar to halogens and alkali metals. Other keylimitationsinMendeleev periodic tablewere that the atomic number in thetablewas not shown increasing in a regular pattern and the symmetry of thetablewas also disturbed.

(i) The position of hydrogen was not correctly defined. It was placed in Group I although its properties resembled both the Group I elements (the alkali metals) and the group VII elements (the halogens).

(ii) In some cases Mendeleev placed elements according to their similarities in properties and not in increasing order of their atomic masses, while some dissimilar elements were grouped together. Thus, the position of these elements was not justified.Example: Copper was placed in group I although it did not resemble the elements of this group.

(iii) In certain pairs of elements like, Ar (40) and K (39); Co (58.9) and Ni (58.6); Te (127.6) and I (126.9) the arrangement was not justified. For example, argon was placed before potassium whereas its atomic mass is more than potassium.

(iv) Isotopes have not been given separate places in the periodic table.

(v) Fourteen elements that follow lanthanum called lanthanides and fourteen elements following actinium called actinides were not given proper places in Mendeleev's periodic table.

(vi) Mendeleev's table was unable to explain the cause of periodicity among elements.

Triad, inchemistry, any of several sets of three chemically similar elements, theatomic weightof one of which is approximately equal to the mean of the atomic weights of the other two. Such triads—including chlorine-bromine-iodine, calcium-strontium-barium, and sulfur-selenium-tellurium—were noted by the German chemist J.W. Döbereiner between 1817 and 1829. The triad was the earliest atomic-weight classification of the elements.

According toBernoulli'stheorem the sum of pressure energy, potential energy and kinetic energy per unit mass is constant at all cross-section in the streamline flow of an ideal liquid. i.e.LimitationsofBernoulli'stheorem: ... The elements of the liquid in the innermost layer have the maximum velocity.

Buffers have many applications. Some of these are:

1)Maintenance of life:Most biochemical processes work within a relatively small pH range. The body uses buffers solution to maintain a constant pH.For example, blood contains a carbonate/bicarbonate buffer that keeps the pH close to 7.4.

2)Biochemical Assays:Enzyme activity depends on pH, so the pH during an enzyme assay must stay constant.

3)In shampoos:Many shampoos use a citric acid/sodium citrate shampoo to maintain a slightly acidic "pH balance".This counteracts the basicity of the detergents present in the shampoo.

4)In baby lotions:Baby lotions are buffered to a pH of about 6.This hinders the growth of bacteria within the diaper and helps prevent diaper rash.

5)In the brewing Industry:Buffer solutions are added before fermentation begins.This prevents the solutions becoming too acidic and spoiling the product.

6)In the textile Industry:Many dyeing processes use buffers to maintain the correct pH for various dyes.

7)In laundry detergents:Many laundry detergents use buffers to prevent their natural ingredients from breaking down.