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The correct option is b, i.e. oxidation. According to this, The PHLOGISTON theory was suggested for oxidation reaction.Explanation:The Phlogistan theory was ONE of the most widely KNOWN theories regarding combustion elements. According to this theory it is PROVEN after empirical testing that all items of combustion contained a fire like element, a substance called phlogiston. This reaction of oxidation is EVEN caused because of  the liberation of phlogiston.

no of molecules formula =moles ×avagordo nohence ,MASS /215 × avagordo NUMBER =1×10power 22 its GIVES ANSWER

: option (B) 7 : 32 explanation : It is given that ratio of masses of oxygen and nitrogen in a particular gaseous MIXTURE is 1 : 4.let mass of oxygen = mthen mass of nitrogen = 4m as we know, MOLECULAR mass of oxygen = 32g/molmolecular mass of nitrogen = 28 g/molso, no of MOLES of oxygen = m/32 and then, no of oxygen molecules = m/32 × N .......(1)where N is AVOGADRO's number.similarly, no of moles of nitrogen = 4m/28 then, no of nitrogen molecules = 4m/28 × N ........(2)from equations (1) and (2), ratio of their no of molecules = {m/32 × N}/{4m/28 × N} = 28/(4 × 32)= 7/32 hence, ANSWER is 7 : 32

: option (A) 1.568 × 10⁴ explanation : percentage of SE in PEROXIDASE anhydrous enzyme is 0.5% by weight. it MEANS, 0.5g of Se PRESENT in 100g of peroxidase anhydrous enzyme.mass of Se = 0.5 gatomic mass of Se = 78.4 g/molso, no of moles = 0.5g/78.4g/MOL ≈ 0.006377 mol as no of mole of Se = no of mole of Peroxidase anhydrous enzymeor, 0.006377 = mass of enzyme/molecular mass of enzymeor, 0.006377 = 100/molecular mass of enzymeor, molecular mass of enzyme = 100/0.006377 ≈ 15,681.3549 g/mol ≈ 1.568 × 10⁴ g/mol

nsity SAT STP is 22.4

SOLUBILITYSolubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum AMOUNT of solute dissolved in a solvent at equilibrium. The RESULTING solution is called a saturated solution.NORMALITYNormality is a measure of concentration equal to the gram EQUIVALENT weight per liter of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute's ROLE in the reaction determines the solution's NORMALITY. Normality is also known as the equivalent concentration of a solution.

The correct answer is option D.Explanation:Suppose in 100 gram of organic compound, 7.7 % is hydrogen.And Carbon , oxygen and SULFUR are ratio of 3:2:4.Mass of hydrogen in organic compound = Let the mass of carbon, oxygen and sulfur be 3x,2x and 4x respectively.7.7 G+3x+2x+4x=100 gx = 10.25 gMass of carbon = 3x = 3 × 10.25 g =30.75 gMoles of carbon =Mass of oxygen = 2x = 2 × 10.25 g =20.5 gMoles of oxygen =Mass of sulfur = 4x = 4 × 10.25 g =41 gMoles of sulfur =Moles of hydrogen =Least possible molecular formula will be equivalent to the empirical formula of this organic substance.Empirical formula of the compound can be determined by individually dividing the moles of all element with smallest number of moles.Carbon =Hydrogen =Oxygen =sulfur=The empirical formula or molecular formula the compound is :Molar mass of the molecular formula is:2 × 12 + 6 × 1+ 1 × 16 + 1 × 32 = 78 g/mol

The condensed formulae is the formulae in which the sigma BONDS or the single bonds are not shown in the figure.Hence, the formula of the first compound is CH3CH2CH2CH3 and the name of the compound is GIVEN by BUTANE since it has 4 carbon bonded together. The condensed formulae of the second structure is CNCH2CH2CN or C4H4N2 known as the succinonitrile or butanonitrile.The third compound can be WRITTEN in condensed formula as CH3CH2CH2COOH which is having the name as butanoic acid since, it has 4 carbon bond and a oic acid or acid group.

udent,◆ ANSWER - (D)The gram molecule of BENZENE is EQUAL to 78 g.● EXPLAINATION -Gram molecule is nothing but the molecular MASS of compound.Gram molecule of benzene is calculated by -Molecular mass = 6 × M(C) + 6 × M(H)Molecular mass = 6 × 12 + 6 × 1Molecular mass = 72 + 6Molecular mass = 78 gTherefore, gram molecule of benzene is equal to 78 g.Thanks dear. Hope this helps you...

(B) 3.125 × 10⁻²Explanation:Magnesium phosphate = MG3(PO4)2 (Given)Mole of oxygen ATOMS = 0.25 (Given)Thus,One mole of Mg3(PO4)2 consist of 8 MOLES of oxygen atom = 1/8x moles of Mg3(PO4)2 consist of 0.25 moles of oxygen atom = x/0.25Therefore, 0.25 mole of oxygen = 1/8 × 0.25= 3.125 × 10⁻²Therefore, magnesium phosphate will contain 3.125 × 10⁻² moles.

the ANSWER is OPTION A.

(B) 40, 30Explanation:As per the question,Let us consider that atomic weight of element X = xAnd the atomic weight of element Y = yAccording to given data of question,When 0.1 mole of XY₂ weighs 10 g, that is,And when 0.05 mole of X₃Y₂ weighs 9 g, that is,Now we have two EQUATIONS and two VARIABLES, on solving we get2x = 80⇒ x = 40And,∴ y = 30Hence, the atomic weights of X and Y are 40 and 30 respectively.Hence, the CORRECT OPTION is (B).

the emparical FORMULA of the COMPOUND is CHO that is the OPTION A

(B) EXPLANATION:As PER the question,Firstly, write the balanced reaction of lead oxide (PbO) with hydrogen chloride ( HCl), we get:According to question,6.5g PbO X 1mol PbO/223 g = 0.03 mol PbO3.2g HCl x 1mol HCl/36.5g = 0.088 mol HClFrom this balanced equation we can say that PbO is the LIMITING reactant. Therefore, we will use PbO to find out the amount of moles of .That is,0.03 mol PbO x 1mol PbCl2/1molPbO = 0.029 mol PbO.Hence, moles of lead (II) chloride formed =

A hydrocarbon contains 80% carbon.What is the empirical FORMULA of the compound is CH3Explanation:given a hydrocarbon contains 80% of C. That means hydrogen will be 20%Atomic mass of carbon = 12 atomic mass of hydrogen=1moles of carbon= 80/12=6.67moles of hydrogen= 20/1= 20since SMALLEST value is 6.67 by DIVIDING we get RATIO of C:H as 1:3so empirical formula is CH3

A) 24 g is the correct ans HOPE it HELPS mark me as brilliant plz FOLLOW methanks

(B) 84Explanation:Quantity of magnesium carbonate ( MgCO3) = 20gQuantity of magnesium oxide ( MgO ) = 8gThe balanced equation will be - MgCO3 → MgO + CO2Therefore, 84g of MgCO3 = 40g of MgO20g of MgCO3 = 40/84 × 20MgO = 9.52Actual yeild = 8G of MgOThus, PURITY % = 8/ 9.52 × 100= 84%THEREFORE, the percentage purity of magnesium carbonate in the sample will be 84%.

Explanation:Quantity of Baco3 = 9.85gBaCO3 can be described as - BaCO3 → BaO+ CO₂2The atomic Mass of BA =137 The atomic Mass of C =12 The atomic Mass of O =16 Therefore, the MOLECULAR mass of BaCO3= 137 + 12 + (16 × 3) = 197 197 GM of BaCO₃ releases carbon dioxide = 22.4 at STP 1 gm of BaCO₃ releases carbon dioxide = 22.4/197  9.85 gm of BaCO₃ released carbon dioxide = 22.4/197 × 9.85 = 1.12 litre

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: The wavelength of a photon of electromagnetic radiation is, 400.29 mExplanation :Formula USED :where,E = energy of photon = conversion used : h = Planck's constant = C = speed of light = = Avogadro's NUMBER = = wavelength = ?Now put all the given values in the above formula, we get:THEREFORE, the wavelength of a photon of electromagnetic radiation is, 400.29 m

s law states that the rate of effusion (or of diffusion ) of a gas is INVERSELY proportional to the square root of it's molecular WEIGHT. The rate of diffusion is THEMEASURE of rate at which two gases mix, and the rate of effusion is the measure of rate at which a gas escapes through a PINHOLE into a vacuum.

Because the SIZE of H- is very LARGE than F-. Due to this sulphur can't accommodate 6 hydrozens

4-FeSO4+Cu, 5-MgSO4+H2

The CONCEPT of PH was first introduced by the DANISH chemist Søren PEDER Lauritz Sørensen at the Carlsberg Laboratory in 1909 and revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells.

Because the PARTICLES of the calcium GOT stick to the SURFACE of water so they FLOATS

In general, the number of WAVES made by a BOHR electron in an orbit is equal to its QUANTUM number. Thus the circumference of the 3rd orbit is equal to 3 TIMES the WAVELENGTH of electron i.e. the electron makes three revolution around the 3rd orbit

2.60gm CAO will be producedExplanation:Ca=40C=12O=16O*3=4840+12+16+48=116116÷25=4.64Ca+O40+16=5656÷4.64=2.60CaO=2.60

tion:The atmospheric PRESSURE decreases with ALTITUDE so INK leak at HIGHER altitude.

the GAS which DIFFUSES 1/3 TIMES FASTER is CL2

, NH3, ..................……

a is the CORRECT ANSWER