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Thus, the percent composition of water, by mass, is 11.19% hydrogen and 88.81% OXYGEN..in water...

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EXPLANATION:

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Explanation:

The atomic number of an element which FORMS basic oxide is 19. The element is potassium. K2O is basic in nature and KOH is a strong base. Potassium is an ALKALI metal and all alkali metal oxides are basic in nature.

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ong>Explanation:

On PASSING electric current, the copper IONS (cations) move towards the cathode and get deposited as copper. Simultaneously, the sulphate ions (anions) move towards the ANODE. So, blue colour of the SOLUTION disappears.

X = Carbon DI OXIDE (CO2)

Y = Caboxy Acid (COOH)

ong>ANSWER:

Light is a transverse, electromagnetic WAVE that can be SEEN by the typical human. The wave nature of light was FIRST illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum.

Explanation:

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ong>Answer:

Tin(II) chloride, also KNOWN as stannous chloride, is a WHITE crystalline solid with the formula SnCl2. It forms a STABLE dihydrate, but aqueous solutions tend to UNDERGO hydrolysis, particularly if hot. SnCl2 is widely used as a reducing agent (in acid solution), and in electrolytic BATHS for tin-plating.

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In atomic physics and quantum CHEMISTRY, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.

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ong>Answer:

the atoms are "hotter" when they COME away from the PISTON than they were before they STRUCK it. Therefore all the atoms which are in the vessel will have picked up SPEED. This means that when we compress a gas slowly, the temperature of the gas increases.

The options that u given all are impure because all the options that u given are the MIXTURE of TWO particles.

Explanation:

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I-, I, I+

..................

J . J. Thomson

British PHYSICIST

ong>Answer:

Acetaldehyde (systematic name ethanal) is an organic chemical compound with the FORMULA CH3CHO, SOMETIMES abbreviated by chemists as MeCHO (Me = methyl). It is ONE of the most IMPORTANT ALDEHYDES, occurring widely in nature and being produced on a large scale in industry. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit,[10] and is produced by plants. It is also produced by the partial oxidation of ethanol by the liver enzyme alcohol dehydrogenase and is a contributing cause of hangover after alcohol consumption. Pathways of exposure include air, water, land, or groundwater, as well as drink and smoke.[11] Consumption of disulfiram inhibits acetaldehyde dehydrogenase, the enzyme responsible for the metabolism of acetaldehyde, thereby causing it to build up in the body.

Answer. Lead nitrate is the lead SALT which produces reddish brown FUMES.

Explanation:

Answer. Lead nitrate is the lead salt which produces reddish brown fumes.

ong>ANSWER:

D lemon juice as it is an ACID which CHANGE Blue litmus to RED.

Ionisation ENERGY = E = -E0 / n2 , where E0 = 13.6 eV (1 eV = 1.602×10-19 Joules) and n = 1,2,3… and so on.

ong>Explanation:

Answer. Self-Reduction PROCESS. The CATIONS of the less electropositive metals like Pb, Hg, Sb and CU may be reduced without the use of any additional REDUCING agent. ... For EXAMPLE, in the extraction of mercury, the sulphide ore (cinnabar) is heated in a current of air when the following reactions take place.

ong>Answer:P>

Magnesium METAL, rutile (TiO2), and quartz (SiO2) are mixed together in a 3:1:1 molar ratio, and heated by a plasma torch in the ABSENCE of air. TWO phases are produced. The first is a “metal” phase consisting of titanium silicide (TiSi) and elemental silicon (Si), which has an verall analysis of 57%mass Ti. The second is a SLAG containing forsterite (Mg2SiO4), magnesium or-thotitanate (Mg2TiO4), and periclase (MgO).

Determine:

a. Mass of titanium silicide produced per kilogram of charge [Note: mass of charge = total mass of all reactants].

b. The mass percent of titanium in the slag

Process reaction: m Mg + n TiO2 + p SiO2 = [x TiSi + y Si] + [a Mg2SiO4 + b Mg2TiO4 + c MgO]

Explanation:

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ong>ANSWER:

[Ne] 3s² 3p¹

Explanation:

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ong>Answer:

In order to RETURN to the ground state, electrons release excess ENERGY in the FORM of light. The light is differently colored in each tube because of the different wavelengths of light that MUST be released in each instance.

...

6.5 Gas Discharge Tubes.

Gas Color

3. Neon Red

4. Argon Violet

5. Krypton Lavender

ong>Explanation:

Coagulation, in PHYSIOLOGY, the process by which a BLOOD clot is formed. The formation of a clot is often REFERRED to as secondary hemostasis, because it forms the SECOND stage in the process of arresting the loss of blood from a ruptured vessel.

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ong>Answer:

as electrode POTENTIAL of SHE is arbitrarily taken as zero OXIDATION or REDUCTION may take PLACE on it depending upon the electrode connected with it.if SHE is +ve then oxidation is taking place on it. and reduction is taking place on other electrode and its(connected electrode) potential will be +1.37V and it lies below SHE in electrochemical series given in reduction mode

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The correct option is : (c) Cl- Explanation : Cl- is not paramagnetic , as it has no unpaired electron.

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ong>Answer:

Cesium

Cesium is used in PHOTOELECTRIC cells used to convert sunlight into electricity. The electrons in cesium atoms are STIMULATED by direct sunlight, and in photoelectric cells, these electrons flow to CREATE an ELECTRIC current. Cesium is an IDEAL catalyst for this photoelectric process.

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ong>ANSWER:

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1) gas

2) liquid

3) solid

rate karna Tumne de SAKTE ho Bina BAAT ka ka kam ka TIME KAR rahe ho

ury

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ong>ANSWER:

FIRST WRITE THE QUESTION PROPERLY

Explanation:

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Here is your answer...

Explanation:

Its a 1st Order Reaction

Rate=k[A]

So, Rate of reaction would be

Rate=6.2×10

−4

×1.25

Rate=7.75×10

4

MOL L

−1

S

−1

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ong>Answer:

RAYON is a versatile fiber and is widely claimed to have the same comfort properties as natural fibers, although the drape and slipperiness of rayon textiles are often more LIKE NYLON. It can imitate the feel and texture of silk, wool, cotton and linen. The fibers are easily dyed in a wide range of colors.

Uses of Rayon

Rayon is USED in TEXTILE industry for making clothing like sarees, blouses, dresses, socks.

It is used to make furnishing such as bed-sheets, curtains, blankets etc.

It is used to make carpets.

It is used in medical field for making bandages and surgical dressing.

ong>ANSWER:

x=carbon, a non metal

p=diamond or allotrope form of carbon

q=is GRAPHITE ,the only nonmetallic ELECTRICAL CONDUCTOR

There are no OPTIONS, but it can be HYDROGEN.

The physical properties of hafnium metal samples are markedly affected by zirconium impurities, especially the nuclear properties, as these two elements are among the most difficult to separate because of their chemical similarity.

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when it's is stretched it's CROSS sectional AREA will decrease and it RESISTIVITY will increase

ong>Answer:

What is the oxidation number of nitrogen in the NO A)- ion? B)+1 C) +2 D) +5 E) +7 7) The reduction half reaction occurring in the standard hydrogen electrode is A) H2 (g. 1 atm) B) 2H (aq) + 20H H20 () 2H (aq, 1M)+2E C) 02 (g)+4H (aq)+ 4e D) 2H (aq, IM) 2e E) 2H (aq, IM) + Cl2 (aq) 2H20 ) H2 (g. 1 atm) 2HCI (aq) 8) In a voltaic cell, electrons flow from the A) salt bride, anode B) anode, salt bridge C) cathode, anode D) salt bridge, cathode E) anode, cathode to the 9) Which of the following reactions is a redox reaction? D K2CrO4BaCl2 (II) Pb22+ +2Br 2PbBr (III) Cu +S CuS BaCrO4 + 2KCI E) (II) and (III) D) () and (II) B) (II) only C) (III) only A) (I) only 10) Which of the halogens below is the strongest oxidizing agent? A) Cl2 E) All of the healogens have equal STRENGTH as oxidizing agents. D) 12 C) F2 B) Br2 11) All of the following have free energy values of zero except A) H2 (g) D) Fe (s) E) Na (s) C) He (g) B) N (g) 12) Consider an electrochemical cell based on the reaction: 2H+ (aq) Sn2+ (aq) H2 (g) Snsalt bridge, cathode E) anode, cathode to the 9) Which of the following reactions is a redox reaction? D K2CrO4BaCl2 (II) Pb22+ +2Br 2PbBr (III) Cu +S CuS BaCrO4 + 2KCI E) (II) and (III) D) () and (II) B) (II) only C) (III) only A) (I) only 10) Which of the halogens below is the strongest oxidizing agent? A) Cl2 E) All of the healogens have equal strength as oxidizing agents. D) 12 C) F2 B) Br2 11) All of the following have free energy values of zero except A) H2 (g) D) Fe (s) E) Na (s) C) He (g) B) N (g) 12) Consider an electrochemical cell based on the reaction: 2H+ (aq) Sn2+ (aq) H2 (g) Sn (s) Which of the following actions would change the measured cell potential? A) increasing the pH in the cathode compartment B) lowering the pH in the cathode compartment: C) increasing the [Sn2+] in the anode compartment D) increasing the pressure of hydrogen gas in the cathode compartment E) Any of the above will change the measure cell potential. 13) One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell.... A) an electric current is produced bya chemical reaction B) electrons flow toward the anode C) a nonspontaneous reaction is forced to occur D) 02 gas is produced at the cathode E) oxidation occurs at the cathode

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In chemistry, a group is a vertical column in the PERIODIC table of the chemical elements. Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell (most chemical properties are dominated by the orbital location of the outermost electron).

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the electronic configuration of xenon is

[KR]5s^2 5p^6 5d^0

as FLUORINE requires to vacant orbitals

hybridisation RESULTS in moving of 5p electron to 5d orbital

therefore the new electronic configuration of xe is [Kr]5s^2 5p^5 5d^1

and undergoes sp^3d hybridisation

The E° value for the Mn3+/Mn2+ couple much more POSITIVE than that for Cr3+/Cr2+ or Fe3+/Fe2+.

Much more third ionisation energy of Mn (where the required change is d5 to d4) is mainly responsible for this. This also explains why the +3 state of Mn is of little importance.

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So... for the element of CHLORINE, you already know that the atomic number tells you the number of electrons. That means there are 17 electrons in a chlorine ATOM. LOOKING at the picture, you can see there are TWO electrons in shell one, eight in shell two, and seven in shell three

Explanation:

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tell me what's your question in the reaction we will do the BALANCE to oxided reaction or in the equation searchs oxided reaction PLZ TELL me

Explanation:

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ong>ANSWER:

Atomicity is the number of ATOMS of an element present in ONE MOLECULE of that element. The number of atoms present in a molecule of phosphorus are 4. So the atomicity of phosphorus is 4. Atomicity of phosphorous is 4.

EXPLANATION:

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ong>EXPLANATION:

plastic because all are NATURAL but plastic is artificial

ong>Answer:

The state governments should be given more powers to control the crimes in the society. It REQUIRES a longer process to be continued for any CASE to REACH the central government so state government should be authorized to take certain immediate and necessary ACTIONS in their hand to prevent crimes.

ong>Answer:

it will be in GROUP 17 or TYE HALOGEN group

er: Option B

Explanation: as IONISATION energy decreases down the GROUP DUE to addition of shell

but in option b it is SHOWING that it is increasing so option b is the incorrect trends of alkaline earth metal

A shopkeeper bought 50 English books at the cost of rupees 2000 per 25 books and 75 Mathematics books at the cost of rupees 1500 per 15 books. Find:

(a) The cost price of the English books.

(b) The cost price of the Mathematics books.

(c) The cost price of all English and Mathematics books.

(d) If he sold the English books at rupees 95 per book, find his profit in English books.

(e) If he sold the Mathematics books at rupees 95 per book, find his profit or loss in Mathematics books.