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and f BLOCK elements have VARIABLE valency.d block= MN (25)= valency= 1,2,3,4,5,6,7

2)2s(2)2P(6)3S(2)3p(5)3RD period, 17 group .

═══════════════╕☬‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌‌‌ ‌ ‌ ‌ ‌ ‌ YOUR ANSWER ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ☬╘═════════════════════╛BORAX BEAD TEST :-Borax is first HEATED on Platinum wire where it dehydrate completely forming glass like beats CONSISTING of NaBo2 and B2o3 is then mixed with SALT to be tested and heated further where coloured metaborates are formed.⏩Borax(Na2B4O7•10H2o)╒══════════════════════╕☬‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌‌‌ ‌ ‌ ‌ ‌ ‌ THANKS! ‌ ‌ ‌ ‌Regards ‌ ‌ ‌ ‌‌ ‌‌ ‌ ‌ ‌ ‌ ‌ ☬╘══════════════════════╛

c hydro CARBONS CONSISTS of CLOSED rings of CARBON ATOMS. Aliphatic hydro carbons consists of linear chains of carbon atoms

end...Here is your ANSWER....Nitrogen is more EN than PHOSPHORUS because on moving down to a group the no. Of shell increases and the EFFECTIVE nuclear charge is decrease.So, EN is decrease......HOPE that it will help you

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oxide REACTS with WATER to FORM calcium hydroxide.Cao + h2o ----------------- ca(OH)2

water is PURE water ie distilled water and in heavy water there are many impurities (minerals VITAMINS ) therefore NACL( common salt ) is more SOLUBLE in water(pure)

te the MOLE FRACTION MOLALITY and molalrity of an aqueous solution CONTAINING 6.1% HNO3 (density=1.038 )

um NITRATE, Barium SULPHATE,POTASSIUM chloride,Sodium nitrate etc. are the SALTS that do not contain WATER of crystallization.

ion to Electrophiles. ... Electrophiles are atoms or molecules known to be electron deficient and that carry a partial (or fully) positive CHARGE and will seek an electron pair to FORM a covalent bond.

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ction between ferric oxide and iron produces aluminium oxide and iron. It is a THERMITE reaction and is HIGHLY exothermic. It produces a large amount of heat, which is released to melt OXYGEN and aluminium. This reaction is used in welding of machineries. It is also used in warfare to make grenades.The CHEMICAL reaction for the above is as follows:3Fe302+4Al----------------2Al2O 3+6Fe.The heat produced by this reaction is -851.5 kJ/moleHope it helps you !!!PLEASE make me as brainliest

-H2Anode-O2So the ANSWER is d) O2, H2

e,Ethane is a linear Compound with Chemical Formula C2H6 WHEREAS Propane has Chemical Formula C3H8. Even after the replacement of Hydrogen to FORM an alkyl GROUP, the Compound will remain Same.In Propane, we can remove the Hydrogen BONDED to the Central Carbon Atom to get another alkyl Group. The availability of Hydrogen Atoms at both end and Central Carbon Atom which Give RISE to more than one Alkyl Group.Hope it helped.

lysis of water is its disintegration to give hydrogen and oxygen gases because of the entry of an electric flow.   2H2O + electrical vitality (+ heat vitality) - > O2 + 2H2   Electrolysis of water is the disintegration of water into oxygen and hydrogen gas because of the section of an electric ebb and flow. The RESPONSE has a standard capability of −1.23 V, which means it in a perfect world requires a potential contrast of 1.23 volts to part water.   This procedure can be utilized to make hydrogen gas and breathable oxygen. As hydrogen is a critical modern item, by a wide margin most mechanical strategies produce hydrogen from flammable gas rather, in the STEAM transforming process.   A DC electrical power source is associated with two terminals, or two plates (commonly produced using some dormant metal, for example, platinum, hardened steel or iridium) which are put in the water. Hydrogen will show up at the cathode (where electrons enter the water), and oxygen will show up at the anode. Expecting perfect faradaic effectiveness, the measure of hydrogen created is double the measure of oxygen, and both are corresponding to the absolute electrical charge directed by the arrangement. Be that as it MAY, in numerous cells contending side RESPONSES happen, bringing about various items and not exactly perfect faradaic proficiency.   Electrolysis of unadulterated water requires abundance vitality as overpotential to conquer different enactment boundaries. Without the abundance vitality the electrolysis of unadulterated water happens very gradually or not under any condition. This is to some extent because of the constrained self-ionization of water. Unadulterated water has an electrical conductivity around one millionth that of seawater. Numerous electrolytic cells may LIKEWISE do not have the imperative electrocatalysts. The proficiency of electrolysis is expanded through the expansion of an electrolyte, (for example, a salt, a corrosive or a base) and the utilization of electrocatalysts.   At present the electrolytic procedure is seldom utilized in mechanical applications since hydrogen can at present be delivered all the more moderately from petroleum derivatives.

as or NOBLE gas is a gas which does not UNDERGO chemical reactions under a SET of given CONDITIONS.

ecomes SALTY when we ADD SALT in it

es above Copper in the reactivity series.Therefore, a chemical reaction has TAKEN place between iron from Iron pot and Copper SULPHATE solution. We can also SAY that iron has displaced copper from Copper Sulphate solution.Since iron has taken part in the reaction, holes will appear in the iron pot after a few DAYS.

chloride react with sulfuric acidBaCl2 + H2SO4 → BaSO4 + 2HClBarium chloride react with sulfuric acid to produce BARIUM sulfate and hydrogen chloride. Sulfuric acid - CONCENTRATED solution. The REACTION takes PLACE in a boiling solution.

istry, a LONE pair refers to a pair of valence ELECTRONS that are not shared with another ATOM and is sometimes CALLED a non-bonding pair. ... Lone pair is a concept used in valence shell electron pair repulsion theory (VSEPR theory) which explains the shapes of molecules.

itary GLAND is located at the base of the brain. It is secreted by growth hormone. its function is to regulate tissue and bone growth.It controls the amount of water reabsorbed by the kidney. It stimulates adrenal cortex to make cortisone. It stimulates thyroid gland to produce thyroxine. It stimulates ovary to produce ova and testes to produce sperms. In meals SECRETION of testesterone. In females ovulation development of Corpus luteum and secretion of progesterone.2. Thyroid gland is located just below the neck. It is secreted by thyroxine which regulate growth and metabolic rate.3. Parathyroid gland is just situated near the thyroid. It SECRETS parathormone which is used for CALCIUM metabolism.4. Thymus is located in the chest close to the heart. its secrets Thymosin which produces antibodies for our body.5. Adrenal is situated just above the kidney which produces cortisone and adrenaline hormone. cortisone hormone is produced by outer part and adrenaline hormone produced by inner part. it adds in conversion of proteins and it reduces blood ,PRESSURE ,heart beat and respiration

mple of good fuel is CNG.........The CHARACTERISTICS of good fuel..1).It should be cheap.2).It should be readily available.3).It should be readily combustible.4).It should be TRANSPORTED easily.5).It should have high CALORIFIC value.CNG posses all these characteristics so it is an example of good fuel.............☺☺

orbital can MIX to form MOLECULAR Orbit where VALENCE electrons are present.

this ANSWER is CORRECT

ce sfrom  amino acids to proteins any YES even our friend WATER are all known to be AMPHIPROTIC

TE!!! CACO3 is the CHEMICAL formula of CALCIUM CARBONATE. hope it HELPS you ♥️

PAC names -- international union for PURE and APPLIED CHEMISTRY .

s in the top of the reactivity SERIES are very reactive hence when they COME in contact with air they start REACTING vigorously (start burning). So they should be STORED under kerosene to PREVENT their contact with air.pls mark as Brainliest!!!

eases as we GO down the GRP in grp. 17 .It's because of size CHARGE

utral of ph =7which MEANS WEAK acid + STRONG base

'M HERE TO HELP YOU:ISOTOPES: These are the atoms of same element having same atomic number but different mass number.FOR EXAMPLE:(check the PIC)HOPE IT'S HELPFUL!!!

The most appropriate SETUP for the detection of gas would be Step 2.Explanation:Zinc is a metal, so when it reacts with an acid, it produces a salt and releases HYDROGEN gas.The released hydrogen gas is detected by bringing a match STICK near the test tube. The hydrogen gas burns with a pop sound.The chemical equation for the reaction of zinc with hydrochloric acid follows:Gases rises up and is EASILY detected when the capillary is not in the solution.Hence, setup 2 is the most appropriate for the detection of hydrogen gas.

ing order :Ca >AL > CU> AU

remains same while GOING down the group..in group 1 -- VALENCY remains 1group 2-- valecy remains 2GROUP 18.. valency remains 0

are pure nitrogen in the laboratory, a mixture of ammonium chloride (NH4Cl) and sodium NITRITE (NANO2) is heated. The first product that is formed is ammonium nitrite (NH4NO2). This compound is very unstable, and BREAKS up into nitrogen and water.Please find the ATTACHMENT for the chemical equation belowHope it helps