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where are the OPTIONS? . . . . . . . . .

n : Work out percentage composition of constituents elements in the following compound.1. Lead phosphate [Pb3 ( PO4)2]2.Potassium dichromate ( K2 Cr2 O2)3.Macrocosmic salt - Sodium ammonium hydrogen phosphate , tectrahyrate(NaNH4 HPO4.4H2O)Answer: a. Lead phosphategiven. PB= 207, P = 31 , O = 16Total MASS of Pb3 (PO4)2=3(207)+(31+4(16))=621+(62+128)=811Percentage of Pb = 3(207)÷811×100=76.57%b. Similarly FIND for potassium dichromate(K2 Cr2 O2)Similarly find for p = 2× 31÷811×100 = 7.64%c. Similarly find % of O = 4× 128÷811×100 = 15.78HOPE THIS HELPS YOU FRD.

distillationExplanation:EG  ACETONE and WATER

crystallisation This method is USED to separate salt from sea water .It is also used to obtain pure CRYSTAL from impure compound . E.g Alum , Mohr salt.etcpurification of water in a water treatment PLANT. water can be purified in a water treatment plant in four step.1) sedimentation tank2) Loading tank3)filteration tank4) chlorination tank.distillation:This method is used to separate a mixture of to micible liquid which have difference in Boling point greater than 25°¢. In this method the VOLATILE component will evaporate FIRST living behind less volatile component. e.g (1) mixture of water and acetone. (2) mixture of water and ethanol. (3) mixture of fuel oil and petrol.

is COMMONLY offered to the children, lovers or even pets, WHEREAS snuggle generally happens between spouses or SEXUAL partners while lying on the bed. In Cuddle, the arms and hands have more to do than in the snuggle. More body PARTS are physically in contact while snuggling than in CUDDLING.

Explanation:According to Heisenberg's UNCERTAINITY PRINCIPLE, velocity of electron, v = 2.5 ×10⁶ ms⁻¹Planck's constant, h=6.623×10⁻³⁴ Js Mass of electron, me=9.1×10⁻³¹ kgΔv = 2.5 * 10⁶ * 0.1 / 100 = 2500 ms⁻¹=> uncetainity position when n = 4 is, Δx = h/nπ * 1/ me*Δv= 6.626 * 10⁻³⁴/4π * 1/ 9.1×10⁻³¹ * 2500= 2.3 * 10⁻⁸ metre=> As the VALUE of "n" varies in above equation, the value the uncertainity position is also varies.

if VOLUME is 1 LITRE

CO2 can exist solvated in water as CO2 but some (most) molecules will actually react with a water molecule to FORM H2CO3 which, in SOLUTION, will dissociate like an acid .Explanation:where h2co3 is a CARBONIC acid.

44 G of methane is required to PRODUCED 11 g of CARBON dioxide after combustion

because the have STRONGEST IONIC BONDS between them and there are so many strong INTER molecular forces

so here glucose is LESS WATER is more if we GOING on boiling water then we put glucose of 1.04g it's SOLUBLE at 81.6

To DETERMINE the DISTANCE between the electrodes and the surface area USING ohm's law is CALLED as conductivity of metal

Chemical properties of acids:Acids REACT with REACTIVE metals. Acid + metal → salt + hydrogen. Copper and silver do not react with DILUTE acid.Acids react with bases. Acid + BASE → salt + water.Acids react with carbonates. Acid + CARBONATE → salt + water + carbon dioxide.

6.022*10²³ EXPLANATION:HOPE, it is HELPFUL

there are the familyExplanation:of METHANE

has TINY particles suspemded in the air. When the SUNLIGHT falls on them, these particles deviate from their LOCATION which creates a BLUE effect... that's why we SEE sky as blue

nobal GAS or INERT gas because its OCTATE COMPLETE

bee STING is acidic in NATURE and BAKING soda is basic in nature . by rubbing baking soda we can nutarlise the bee sting.

tion:The simplest compounds of copper are binary compounds (i.e., those CONTAINING only two elements). The PRINCIPAL compounds are the OXIDES, sulfides, and halides.

the atomic masses of NaCo3 is Explanation:Na= 23 C= 12 O= 16 then , 23+12+16×3= 73 is the TOTAL MASS of the compound

5.27*10^-25Explanation:by HEISENBERG's UNCERTAINTY PRINCIPLE,DX *dp=h/4pieor,dx=6.626*10^-27/4*PIE*10^-3=5.27*10^-25

helpsbt SORRY i DONT KNOW about the 5TH ONE

cc=CH hhhExplanation:PLZ CLEAR the QUESTION

with the HELP of distillation.or in ATTACHMENT

atomic number:8 Oxygenadd 2more electrons in the VALENCE shell to get atomic number 10add 3 more electrons in another new energy LEVEL which gives atomic number 13Explanation:PLEASE MARK MY ANSWER AS BRAINLIEST ANSWER

NH3N2 + 3H2 - 2NH3H2 + O2 -H202H2 + O2 - 2H2ONA2O +H2O - 2NaOH2CO + O2 -2CO2Zn + 2HCL -ZnCL2 +H2

C3H6Explanation:

a hai isse ek electron nikala Na - Na+ + E- jb electron nikalege toh jo ANOTHER electons H unka nucleus SE attraction bdhega toh radii KM hogi

n GAIN enthalpy of CL is higher than F because Cl has an higher ATOMIC RADIUS than compared to F. So the EGE of Cl is higher...

the REASONS are:it is LEAST reactiveit is LUSTROUS in natureit is a natural ELEMENTIT doesn't corrode easily

1) Visualization of colored compounds is simple the spots can be directly observed after  development. 2) Because most compounds are colorless however, a visualization method is needed. 3) The silica gel on the TLC plate is impregnated with a fluorescent material that glows under  ultraviolet (UV) light. 4) A spot will interfere with the fluorescence and appear as a dark spot on a glowing background. 5) While under the UV light, the spots can be outlined with a pencil to mark their  locations. 6) A second method of visualization is accomplished by placing the plate into IODINE vapors  for a few minutes. 7) Most organic compounds will form a dark-colored complex with iodine. 8) It is  good practice to use at LEAST two visualization techniques in case a COMPOUND does not show up with  one particular method.