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From the equation 2x + 3y → 4l + m

2 moles of x react with 3 moles of y

∴ 8 moles of x is supposed to react with 3/2 x 8 moles of y = 12 moles

Since we have 15 moles of y, it means y is in excess

i) The limiting reagent is x

2 moles of x produce 4 moles of l and 1 mole of m

ii) 8 moles of x will produce 2x8 = 16 moles of l

8 moles of x will produce 1/2 x 8 moles of I = 4 moles

iii) Excess reactantis y

Excess y = 15 moles - 12 moles = 3 moles

thank u

First, you need to find the balanced equation i.e.

2Mg+O2= 2MgO

Here 1g of Mg is taken, so moles of Mg= 1/24=0.041 moles

0.5 g of O2 is taken, so moles of O2=0.5/32= 0.01 moles

For 0.01 moles of O2, 2*0.01 moles of Mg are required according to Stoichiometric Coefficients.

But we have 0.041 moles, so Mg is excess reagent whereas O2is limiting reagent.

Moles of MgO formed = Moles of O2* 2

0.01*2=0.02 moles of MgO. Mass of MgO= 0.02*24= 0.48 g of MgO.

option D is correct

Let P2 = 1.004 P1 ..... A 0.4% increase in PLet T2 = T1 + 1 ........... See note below

P1V1/T1 = P2V2/T2 ..... combined gas lawP1/T1 = P2/T2 ............... Assume V remains constant.T1 = P1T2 / P2 .............. solve for T1T1 = P1(T1+1) / (1.004P1)T1 = (T1+1) / 1.0041.004T1 = T1 + 11.004T1 - T1 = 10.004T1 = 1T1 = 1 / 0.004T1 = 250KA 1 degree increase on the Celsius scale is a 1 degree increase on the Kelvin scale. Temperatures used in the combined gas law must be in Kelvin

Hydrogen is only atom in which no neutron is present in it's nucleus. Instead only one proto. is present.

So answer is option c.

Diamond is the naturally occurring hardest substance but wortzite boron nitride and lonsdaleite (comming from meteroids) are harder than diamond

Diamond is currently thought to be the hardestnaturalmaterial on Earth, having a hardness of ten out of ten on the Mohs scale of mineral hardness. Diamond is made up ofcarbonatoms which share strongcovalentbonds (where electrons are shared between atoms) and are equallyspacedin a lattice arrangement.

An atom is composed of positively charged particles. Majority of the mass of an atom was concentrated in a very small region. This region of the atom was called as thenucleusof an atom

Atoms nucleus is surrounded by negatively charged particles calledelectrons. The electrons revolve around the nucleus in a fixed circular path at very high speed. These fixed circular paths were termed as“orbits.”

An atom has no net charge or they areelectrically neutralbecause electrons are negatively charged and the densely concentrated nucleus is positively charged. A strong electrostatic force of attractions holds together the nucleus and electrons.

The size of the nucleus of an atom is very small in comparison to the total size of an atom.

a)Features of Bohr’s Models :(i)Electrons revolve in certain permitted orbits which are associated with fixed amount of energy. So they are called energy levels (K, L, M, N).(ii) As long as electron revolves in the same energy level, they do not radiate energy.(iii)The energy of orbit closest to nucleus is lowest and farthest away is highest.(iv)When we supply energy to electron, it goes to higher energy level and when it comes back to lower level it radiates energy.

tqu

The Bohr model has the following features:

1) There is a nucleus (this was Rutherford's discovery).2) The electrons move about the nucleus in "stationary states" which are stable, that is, NOT radiating energy.3) When an electron moves from one state to another, the energy lost or gained is done so ONLY in very specific amounts of energy, not just any old amount.4) Each line in a spectrum is produced when an electron moves from one stationary state to another.

The postulates of Bohr's Atomic Model are as follows:

1.Electrons revolve round the nucleus with definite velocities in concentric circular orbits situated at definite distances from the nucleus. The energy of an electron in a certain orbit remains constant. As long as it remains in that orbit, it neither emits nor absorbs energy. These are termed stationary states or main energy states.

2.Bohr proposed that the angular momentum of an electron is quantized. Thus, the motion of an electron is restricted to those orbits where its angular momentum is an integral multiple ofh/2π, where h is Planck’s constant.

3.The energy of an electron changes only when it moves from one orbit to another. An electronic transition from an inner orbit to outer orbit involves absorption of energy. Similarly, when an electron jumps from an outer orbit to inner orbit it releases energy, which is equal to the difference between the two energy levels.

Energy of an electron in nth orbit

Postulates of Bohr's Modelof an Atom. In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called as orbits or shells. ... This range of quantum number starts from nucleus side with n=1 having the lowest energy level.

Alpha particles are He^2+ ions. Their mass is that of four protons and charge is that of 2 protons. Substitute all the values to obtain the answer.

Isoelectronicrefers to two atoms,ionsor molecules that have the same electronic structure and the same number of valence electrons. The term means "equal electric" or "equal charge".Isoelectronicchemical species typically display similar chemical properties.

Cations- K+,Ca2+

Anions- Cl-, S2-

Isoelectronicrefers to two atoms,ionsor molecules that have the same electronic structure and the same number of valence electrons. The term means "equal electric" or "equal charge".Isoelectronicchemical species typically display similar chemical properties

Option A

(b) Na+ ion

The electronic configuration of Na atom is 1s2 2s2 2p6 3s1. A positive charge on the species indicates the loss of an electron by it.∴ Electronic configuration of Na+ = 1s2 2s2 2p 6 3s0 or 1s2 2s2 2p6

(c) O2- ion The electronic configuration of 0 atom is 1s2 2s2 2p4. A dinegative charge on the species indicates that two electrons are gained by it.

option (2) is the correct answer to this question, because it has half filled electronic configuration and lower atomic radius.

option 2 is the correct answer

option 2 is the correct answer

if x% is the heavier mass, then (100-x)% will be the lighter isotope.

thanks 👍👍

Count the number of electrons and keep in mind the chargesisoelectronic species have same number of electrons.a)Na+ has 10 electrons, Ne has 10 electrons.

b)K+ has 18 electrons, O has 8

c)Ne has 18 electrons, O has 8

d)Na+ has 10 electrons, K+ has 18

so option a) is correct

thanks😊😊

1.Electrolysis of aqueous sodium chloride: Electrolysis of aqueous NaCl results in hydrogen and chloride gas. At the anode (A), chloride (Cl-) isoxidizedto chlorine.2. CuSO4⇋ Cu2++ SO24- H2O ⇋ H++ OH-At cathode, Cu2++ 2e-__> Cu2; Eocell= 0.34 V H++ e-__> H2; Eocell= 0.00 V(i) reaction will take place due to higher reduction potential. At anode, 2SO24-- 2e-__> SO28-; Eocell= 1.96 V 2H2O__> O2+ 4H+4e-; Eocell= 1.23 VThe reaction with lower value of Eowill be preferred at anode, hence O2is released at anode.3. Whencopper electrodesare used in theelectrolysis of copper sulfatesolution, the mass loss ofcopperfrom the positive anodeelectrodeshould equal the mass ofcoppergained and deposited on the negative cathodeelectrode.

An iron nail displaces copper from a copper sulphate solution to form a ferrous sulphate solution, due to which the blue colour of the copper sulphate solution fades. Also, copper is deposited on the iron nail, which turns it reddish-brown in colour.

option B & C is the correct answer. As they both are same. and also they will not show any inversion. Which is needed in Sn2

Question 14: How much electricity is required in coulomb for the oxidation of (i) 1 mol of H2O to O2.(ii) 1 mol of FeO to Fe2O3.

Answer:(i)We have 1 mol of H2O1 mol of H2O will give one atom of OCharge on O = – 2Electricity required =n F= 2 × 96487 Coulombs= 192974 Coulombs= 1.93 × 105Coulombs

(ii)Charge on Fe in compound FeO = + 2Charge on Fe in compound Fe2O3= + 3Change in charge n = 1Electricity required = nF= 96487 Coulombs= 9.65 × 104Coulombs

1.93×105 coulombs is right answer

2 Faraday required for first case and 1F required for 2nd case..

options (ii) is the correct answer.

How Much Electricity Is Required In Coulomb For The OxidationOf (i) 1 Mol Of H2O To O2.

How Much Electricity Is Required In Coulomb For The OxidationOf (i) 1 Mol Of H2O To O2.

evaporation takes place at any temperature boiling takes place at 100 degree Celsius evaporation is a slow process

boiling is a fast process

evaporation speed is decreased when there is humidity

in boiling water boils at 100 degree Celsius

The amount of temperature required to change the state of substance is known as latent heat

6.022*10^23 molecules=18 gm of water

Therefore,1 molecule=18/6.022*10^23 gm of. Water

=3.0*10^-23gm of water

We know, density=mass/volume

Volume=mass/density

=3.0*10^-23gm/1gm cm^-3

=3.0*10^-23 cm^3

Functional group is carboxylic acidhence option b

NH4Cl is formed from strong acid HCl and weak base NH4OH.When NH4Cl dissolved in water it readily releases H+ions. Hence aqueous solution of NH4Cl is acid.

In Homogeneous solution components are completely mixed and solution is uniform through out.In heterogeneous solution components can be separated and the solution is not uniform.Homogeneous solution cannot be separated by physical method and heterogeneous can be.Example-Homogeneous - sugar mix with waterHeterogeneous - send mix with pebbles

mol fraction of solute=0.2hence mol fraction of benzene=1-0.2=0.8it means that 0.8 mol of benzene contains 0.2 mol of solute.................⇒0.8*78g of benzene contains 0.2 moles of solute⇒ 62.4g.................................0.2mol...............⇒1g......................................(0.2/62.4)mol.......hence 1000g of benzene would contain (1000/62.4)*0.2 mol of solute=3.2=molality of solute=x

charged resonating structure is always unstable than a neutral structure

so 1>2>3

Asoluteis a substance dissolved in another substance. ... Thesoluteis usually present in a smaller amount than thesolvent. Anexampleof this would be dissolving a teaspoon of table salt (NaCl) in water (H2O). Water is thesolventand the salt is thesolute andtogether they make a salt (saline)solution.

Option A is the correct definition of molality.

option C is the correct answer

option c is the correct answer

5.ans=option b is the correct answer

5) c6) c7. b8 b this is your answer

5.answer =option b is the right answer

5. answer=option b is the right answer

CaCO3+ CO2+ H2O → Ca(HCO3)2

Pour acid and water into each of the labeled beakers.

Addcalcium carbonateto the water and then to the acid and observe.

Thecalcium carbonatewilldissolvein the acid producing CO2gas. It will notdissolvein pure water. The Kspforcalcium carbonatein water is 3.4 x 10-9.

A a powder containing calcium hypochlorite, used chiefly to remove colour from materials. 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.

In chemistry, water of crystallization or water of hydration or crystallization water is water molecules that are present inside crystals. ... In some contexts, water of crystallization is the total mass of water in a substance at a given temperature and is mostly present in a definite (stoichiometric) ratio.

Uses of Dihydrogen:(i) The largest single use of dihydrogen is in the synthesis of ammonia which is used in the manufacture of nitric acid and nitrogenous fertilizers.(ii) Dihydrogen is used in the manufacture of vanaspati fat by the hydrogenation of polyunsaturated vegetable oils like soya bean, cotton seeds etc.(iii) It is used in the manufacture of bulk organic chemicals, particularly methanol.CO (g) + 2H2(g) →CH3OH(l)(iv) It is widely used for the manufacture of metal hydrides.(v) It is used for the preparation of hydrogen chloride, a highly useful chemical.(vi) In metallurgical processes, it is used to reduce heavy metal oxides to metals.(vii) It is used as a rocket fuel in space research.(viii) It does not produce any pollution and releases greater energy per unit mass of fuel in comparison to gasoline and other fuels.

a. It is used for bleaching dirty clothes in the laundry, as a bleaching agent for cotton and linen in the textile industry. It is a strong oxidizing agent hence used as an oxidizer in many industries. It is used as adisinfectantwhich is used for disinfecting water to make potable water.b. Washing soda can be used to remove greasy build-up from pots and pans, oven racks, and drip pans. It is very good for removing coffee and tea stains from ceramics and plastic storage containers. It can even be used inbathrooms to remove soap scumand around the house for general cleaning of hard surfaces. For cleaning, mix a solution of 1/2 cup of washing soda to one gallon of warm water.

It is composed of air and water. Milk of lime reacts with chlorine to form hypochlorite, a constituent of bleaching powder . It is Ca(OCl)22Ca(OH)2 + 2cl2 - CaCl2 + Ca(OCl)2 + 2H2O

1.It is used for bleaching silk and wool.2.It is mainly used as bleaching agent for cotton,linen and wood pulp.3.It is used for manufacturing of chloroform.

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

(ii) It is used for disinfecting the drinking water