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Answer:

oxygen is left by 0.8 grams

Explanation:

in reaction of calcium and oxygen

2Ca + O2 ----> 2CaO

for 80 grams of calcium ( 2 mole mass of calcium = 80) it requires 32 GM of oxygen

now for 4 grams it requires just 1.6 gm of oxygen (since 4 = 80/20 1.6 = 32/20)

but here is oxygen is PRESENT in excess( i.e more than 1.6)

hence after TOTAL reaction 2.4-1.6 gm of oxygen is left

  .

.      .   0.8 gm of oxygen is left

ANSWER:

COBALT

EXPLANATION:

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Answer: For Example, When n-Hexane Is Passed Over Chromium OXIDE (Cr2O3) Supported Over Alumina (Al2O3) at 600 DEGREE Celsius, Benzene Is Produced. The Reaction INVOLVES SIMULTANEOUS Cyclization And Dehydrogenation. Under Similar Conditions, n-Heptane Yields TOLUENE.

Answer:

Explanation:  Agricultural lime, also CALLED aglime, agricultural limestone, GARDEN lime or liming, is a soil additive made from pulverized limestone or chalk. The primary ACTIVE component is calcium carbonate. Additional chemicals vary depending on the mineral source and may include calcium oxide. Unlike the types of lime called quicklime (calcium oxide) and SLAKED lime (calcium hydroxide), powdered limestone does not require lime burning in a lime kiln; it only requires milling. All of these types of lime are sometimes used as soil conditioners, with a common theme of providing a base to correct acidity, but lime for farm fields today is often crushed limestone. Historically, liming of farm fields in centuries past was often done with burnt lime; the difference is at least partially explained by the fact that affordable mass-production-scale FINE milling of stone and ore relies on technologies developed since the mid-19th century.

Answer:

Explanation: The CLASS “DogName” IMPLEMENTS Cloneable INTERFACE. ... The program would throw CloneNotSupportedException if we don’t implement the Cloneable interface. A class implements the Cloneable interface to indicate to the OBJECT

Answer:1. Na,MG , Si , S , CL

2. LI , Na , K , RB , Cs

4.I , Br , F , Cl

5.Li , Na , K , Rb , Cs

Explanation:

H2S + SO2 = H2O + S (Hydrogen sulfide + Sulfur DIOXIDE)

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Explanation:

HEYA MATE HERE IS UR ANSWER ❤

One ATOM can have more than one electrovalent or COVALENT bonds. The main difference between electrovalent and covalent bond is that electrovalent bond is formed when TWO atoms are in an electrostatic attraction whereas covalent bond is formed when two atoms share their electrons with each other.

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Answer:

3

Explanation:

because after 0 we have to count the NUMBER of SIGNIFICANT figures

so after 0.0261 there are 261 are 3

Explanation:

8g of OXYGEN is 0.5 MOLES of oxygen atoms

1mole of co2 contains 2MOLES of oxygen atoms

hence 0.25 moles of co2 will contain 0.5 moles of oxygen(8g

hope it helps you

Answer:

12 LIT

Explanation:

when 1 MOLE h2 REACT with 1 mole of N2 then 2 mole of ammonium FORMED

so when 6/22.4 h2 will react than 12/22.4 ammonium formed

on INCREASING the TEMPERATURE ADSORPTION will be INCREASES.

EXPLANATION:

C TRIPLE BOND c

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1. 3

2. Argon

3. group 18

4. chlorine

5. lithium

6. sodium

7. lithium

8. The FIRST elements of all periods

9. Chlorine

10. helium

11. sodium

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Answer:

i) Y

ii)R

iii)Q

Iv)X

V)Y and Z

Explanation:

i) As Atomic no.55 is Cs so its a alkali metal thats why producing basic oxides

ii) as Atomic number 18 is argon so its inert.

iii) Its Bismuth as it shows the respective PROPERTIES if any doubt just google it.

iv) As Element X is Cr it has d orbital so it lies in the d block

v) Y= Cs

Z=Br

They are ELECTRO negative pairs

Answer:

C6H5OH + O2 = CO2 + H2O.

Explanation:

The Organic Solvent PHENOL, C6H5OH Dissociates To A Small Extent In Water According To The FOLLOWING Equilibrium Equation: C6H5OH(aq) ⇄ C6H5O - (aq) + H + (aq) Use Le Chatelier's Principle To Predict Which Form Of Phenol (C6H5OH Or C6H5O - ) Will INCREASE In Concentration As A Result Of The Addition Of HCl.

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Answer:

OPTION A- FLOURINE (Fl)

Flourine is a pale yellow gas.

while bromine is brown in colours.

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Metals replace hydrogen from dilute acid, whereas non-metals do not. Why?

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here it is...!!

____________________________________________

Hydrogen from dilute acids can only be replaced if electrons are supplied to H+ IONS of the acid.

H2SO4(AQ) ---------) 2H+(aq) + SO4²‐(aq)

2H+ + 2e‐ ---------) H2(G)

HCl(aq) ----------) H+(aq) + Cl‐(aq)

H+ + e‐ ----------) H

2H ----------) H2(g)

Metals have a tendency to lose electrons and HENCE they supply electrons, i.e., they are electron donors. That is why metals displace hydrogen from dilute acids.

On the other hand, non-metal is an electron acceptor. It cannot supply electrons to H+ and hence, it does not replace hydrogen from dilute acids.

____________________________________________

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Answer:

23+14+(3×16)

=23+14+48

=85

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ANSWER:

SEPARATION funnel

Explanation:

two liquids that don't mix with each other can be separated USING a separation funnel.

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ANSWER:

your answer is

Explanation:

if the Ph of a pond is measured as 4 then it MEANS that it is an acid.so the concentration of HYDROGEN ions will be more as compared to hydroxide ions.

Answer:

Diffusion is the name of this PHENOMENA, it happens in liquids and solids ( ATOMIC diffusion ) as well although in solids it is a very slow process.In liquids it is quicker, imagine PUTTING a drop of dye into a bowl of CLEAR water, after a while all the water will be colored.

ANSWER:

you should immediately WASH that AREA with cold WATER

Answer:

H molecule has a single bond(one bond)

O molecule has Double bond( two bonds)

N molecule has Triple bond( three bonds)

Explanation:

: since H atom has one electron in its outermost shell and maximum amount it can have is two, so it make a single bond with another H atom. (H-H)

: O has 6 electrons in outermost shell and need 2 electron for Octat it bond with another O with their 2 electrons SHARING with EAR other.(O=O)

: N molecule has 5 electrons in outermost shell hence NEEDS 3 electrons for octat completion. So it share its 3 electrons with another N atom and form triple bond.

For your information maximum NUMBER of electrons in outermost shell is 2, 8,8,18,18 and so on.

Answer:sodium hydroxide reacts with zinc and water to form sodium zincate and HYDROGEN GAS. Zn(s)+2NaOH(aq)+2H2O(l)→Na2Zn(OH)4(aq)+H2(G).

Explanation:

ANSWER:

CH2 is correct answer.......

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no PROBLEM..............

ANSWER:

ASSERTION and REASON true

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In aqueous solution, α-anomer and β-anomer of glucose remain in equilibrium with each other along with a small amount of glucose in open chain FORM (0.02 %0.02 %). The open chain form in the solution contains a free aldehydic group and hence gives several reactions involving free aldehyde.

Though little, the open chain form of glucose reacts with many REAGENTS which are used to treat free aldehydic groups. Therefore, glucose in aqueous solution also reacts with those reagents.

glucose(aq)+HCN⟶gluco cyanohydringlucoseX(aq)+HCN⟶gluco cyanohydrin

glucose(aq)+H2NOH⟶gluco oximeglucoseX(aq)+HX2NOH⟶gluco oxime

glucose(aq)+

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Explanation:

Bronsted-Lowry BASE is a substance that accepts a PROTON in the form of a hydrogen (H) ATOM. ... The conjugate ACID is the substance that results when the Bronsted-Lowry base accepts a proton, and the conjugate base is the COMPOUND that results after the acid has donated a proton......

Answer:

Anhydrous dihalides are GENERALLY SYNTHESIZED by reaction of a pure metal with hydronic helices or for labiel metal ions , by dehydration of HYDRATED salts with a covalent halogen COMPOUND.

Ex: SOCl2

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Answer:

relative atomic mass of BORON is equal to NUMBER of moles into MOLECULAR WEIGHT of boron I think

Answer:

EXPLANATION:

STABILITY DECREASES as O2+  > O2 > O2- > O22

Explanation:

Kerala, a state on INDIA's tropical Malabar Coast, has nearly 600km of ARABIAN Sea shoreline. It's known for its palm-lined beaches and backwaters, a network of canals. Inland are the Western Ghats, mountains whose slopes support tea, coffee and SPICE plantations as well as WILDLIFE. National parks LIKE Eravikulam and… more

Answer:

its in +2 OXIDATION STATE

EXPLANATION:

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Explanation:

Keptane= heptane

Seven CARBON CONTAINING ALKANE.

It's MISPRINT in Navneet Digest STD X Maharashtra Board

ANSWER:

d.phosphorus Chloride.

Explanation:

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ANSWER:

AL4C3 + 12H2O=4Al(OH)3+ 3CH4

Answer:

The mole (symbol: mol) is the unit of measurement for amount of substance in the International SYSTEM of Units (SI). A mole of a substance or a mole of particles is defined as EXACTLY 6.02214076×1023 particles, which may be atoms, molecules, IONS, or electrons....

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Thank you..

Answer:

It is tetrahedral

Explanation:

The carbon atom central to the methane MOLECULE has 4 valence ELECTRONS and thus needs 4 more electrons from four hydrogen atoms to complete its octet. The hydrogen atoms have a 109 degree bond angle GIVING the molecule a tetrahedral geometry .

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ANSWER:

Tetrathiocyanato-KScobaltate(2) ION

ANSWER:

hellooo❣

Explanation:

VERIFY this

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ANSWER: mansar is COMING 4.1

Explanation:

Explanation:

Proteins are macromolecules FORMED by AMINO acids. Proteins are large size molecules (macromolecules), polymers of structural units called amino acids. A total of 20 DIFFERENT amino acids exist in proteins and HUNDREDS to thousands of these amino acids are attached to each other in long chains to form a protein.

Answer:

here is the answer in stepwise

Explanation:

1 in a CHEMICAL reaction the reactant is written in

left SIDE while the product is written in RIGHT side. 2.the reactants and products are written by an arrow. 3chemical equation contain the state properties of reactant and product. HOPE it will help you

Answer:

option ( C) is CORRECT .

CHEMICAL element that have same chemical properties are called isotopes .

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Answer:

d)PH3 is a base not a lewis acid!

.

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explain...for BF3..

A Lewis acid can accept a pair of electrons from a Lewis base. The BORON in BF3 is ELECTRON poor and has an empty ORBITAL, so it can accept a pair of electrons, MAKING it a Lewis acid. A Lewis acid is defined as an electron-pair acceptor. So for something to act as a Lewis acid, it NEEDS to want electrons.

ANSWER:

casio3

Explanation:

ANSWER:

The Physical state of water at 65C is liquid.

Answer:

EXPLANATION:

concentration refers to the amount of a substance in a defined space Concentration is USUALLY expressed in terms of mass per unit volume.

Solubility 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.

HENRY LAW:the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid:

C=kPgas

C=kPgas

where

C  is the solubility of a gas at a fixed temperature in a particular solvent (in units of M or ML gas/L)

k is Henry's law CONSTANT (often in units of M/atm)

Pgas  is the partial pressure of the gas (often in units of atm)

Answer:

Coronaviruses are a group of related virusesthat cause diseases in mammals and birds. In humans, coronaviruses cause respiratory tract infections that can be mild, such as some cases of the common cold (AMONG other possible causes, predominantly rhinoviruses), and others that can be lethal, such as SARS, MERS, and COVID-19. Symptoms in other species vary: in chickens, they cause an upper respiratory tract disease, while in cows and pigs they cause diarrhea. There are yet to be vaccines or antiviral drugs to PREVENT or treat human coronavirus infections.

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