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Answer:(1)80Explanation:

Elements from atomic no 21 to 100,each has 3d-electron in its configuration.

option 1 is the correct answer of the given question

option 1) 80 is correct answer

option b is correct

4s is filled first thatn 3d. in the energy level diagram.

The properties ofscandium compounds are intermediate between those of aluminium and yttrium. A diagonal relationship exists between the behavior of magnesium and scandium, just as there is between beryllium and aluminium. In the chemical compounds of the elements in group 3, the predominantoxidation stateis +3.

option b +1 and +3 is the most common oxidation state of scandium

this happens due to inert pair effect

The oxidation number of phosphorus is +3. In compounds of phosphorus, the most common oxidation numbers of phosphorus are 5, 3, and -3

The correct answer is option a)

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F has -1 oxidation state and Li has +1 oxidation state

option b

3 ethyl 4 propyl heptane

3,4-diethyl-4-methyl-heptane

The distribution of natural resources depends upon many physical factors like land, climate and altitude. The distribution of resources is unequal because these factors differ from place to place on this earth.

Option a) is correct because sum of two transitions is equal to the third or longest transition now as energy is proportional to wavelength it's also true.

correct answer is (a)

The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s shell is filled before the 2s subshell is occupied.

c is correct

For a calcium atom with atomic number 20, the shells K, L, M and N will have 2, 8, 8 and 2 electrons, respectively.

K-shell contains 2 atoms and L-shell contains 8 atoms. M-shell can accommodate upto 18 electrons but in the case of calcium, the M-shell has 8 electrons; the next electron enters the N-shell. That is, the fourth shell-N has started to fill up even before the third energy shell-M is complete with 18 electrons.

Methane gas can also be convertedtomethanol, a liquid form of methane. We use four types ofbiomasstoday: 1) wood and agricultural products; 2) solid waste;3) landfill gas; and 4) alcohol fuels.biomass energy. Otherbiomass sourcesinclude agricultural waste products like fruit pits and corn cobs.

tqsm

1s2 2s2 2p6 3s2 3p6 3d6 4s2

Iron ( Fe) = [Ar] 3d6 4s2

Non-metals react with oxygen in the air to produce non-metal oxides. Here are two examples for the non-metals carbon and sulphur. Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for acid rain. They dissolve in the water in the clouds to form acidic solutions

Compound B is NaOHSodium hydroxide (NaOH) is a commonly used base and it absorbs moisture from the atmosphere and becomes sticky.

The acidic oxides react with base to give salt and water. Lets take an acidic oxide - Sulphur dioxide.The reaction between NaOH and SO2 can be given as

2NaOH + SO2 -------> Na2SO3 + H2O

2

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option ii , is the correct answer.. due to vacant d- orbitals

3° hydrogen are present only in -CH3... and no. of such hydrogen are 3. only

so, the only option matching is option 4.

When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.2Mg + O2→2MgO

HCl-acidicNacl- BasicMgO- basicKCl-neutral saltCaO- basic groupH2SO4- acidic groupHNO3- acidH2O- neutral gruopNa2Co3- neutral salt

Ethanol -> CH₃CH₂OH

When Ethanolis heated with excess of conc. H₂SO₄, at 443 K , Ethene is formed . conc. H₂SO₄CH₃CH₂OH ----------------------> CH₂ = CH₂ + H₂O

H₂SO₄ acts as a dehydrating agent , that removes water molecule from ethanol

During the process of extraction of pure copper from copper pyrite,SiO2 acts as acidic flux which combines with iron oxide(FeO) to form iron silicate(FeSiO3). CuFeS2 + heat ---> Cu2s + FeS + SO2 FeS + O2 ----> Feo FeO + SiO2 ----> FeSiO3

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b)On heating gypsum at 373 K, it loses watermolecules and becomes calcium sulphatehemihydrate ( CaSO4. 1/2 H2O). This is calledPlaster of Paris.c) When chlorine is pased through dry slakedlime Ca(OH)2 , bleaching powder is obtained .Ca(OH)2 + Cl2 ---------> CaOCl2 + H2OSlaked lime Chlorine Bleaching powder

(a) Hydrated CuSO₄ is heated :-When CuSO₄.5H₂O ( Hydrated copper sulphate) , contains 5 molecules of water of crystallisation.Salts containing water of crystallisation are called hydrated salts. When the hydrated salt (CuSO₄.5H₂O) is heated, it loses its water of crystallisation and becomes anhydrous salts (without water of crystallisation).The blue colour of CuSO₄ is due to the presence of water of crystallisation. Hence, when it loses its water of crystallisation, the solution becomes colourless.

Where is the part 1 answer. Please tell that also!

I have given the solution of 1st part

Thank you so much

Compound are called hydrocarbons because they contain hydrogen and carbon atom. CnH2n+2=alkanes. c-c-ccnH2n=alkene. c=ccnH2n-2= Alkyne. c 3- c(triple dash)Addition reaction converts Alkene into alkyne

The s-block elements are the 14 elements contained within these columns. All of the s-block elements are unified by the fact that their valence electrons (outermost electrons) are in ansorbital. Thesorbital is spherical and can be occupied by a maximum of two electrons. Elements in column 1 have one electron in thesorbital, and elements in column 2 (plus helium) have two electrons in thesorbital.

The s-block elements include hydrogen (H), helium (He), lithium (Li), beryllium (Be), sodium (Na), magnesium (Mg), potassium (K), calcium (Ca), rubidium (Rb), strontium (Sr), cesium (Cs), barium (Ba), francium (Fr) and radium (Ra). The periodic table shows exactly where these elements are within the s-block.

Properties of S-Block Elements

If the elements were houses in our hypothetical s-block neighborhood, they would be very uniform, each one only slightly different than the other. This is markedly different compared to the other neighborhoods on the periodic table, which have a wider variety of houses in many shapes, sizes and colors.

All of the s-block elements are metals. In general, they are shiny, silvery, good conductors of heat and electricity and lose their valence electrons easily. In fact, they lose their trademarksorbital valence electrons so easily that the s-block elements are considered to be some of the most reactive elements on the periodic table.

The elements in column 1, known collectively as thealkali metals(except hydrogen), always lose their one valence electron to make a +1 ion. These metals are characterized by being silvery, very soft, not very dense and having low melting points. These metals react extremely vigorously with water and even oxygen to produce energy and flammable hydrogen gas. They are kept in mineral oil to reduce the chance of an unwanted reaction or worse, an unwanted explosion.The elements in column 2, known as thealkaline earth metals(except helium), always lose their two valence electrons to make a +2 ion. Like the alkali metals, the alkaline earth metals are silvery, shiny and relatively soft. Some of the elements in this column also react vigorously with water and must be stored carefully.

S-block elements are famous for being ingredients in fireworks. The ionic forms of potassium, strontium and barium make appearances in firework displays as the brilliant purples, reds and greens.Francium is considered to be the most rare naturally occurring element on earth. It is estimated that there is only ever one atom of Francium present on earth at a time. Francium has a very unstable nucleus and undergoes nuclear decay rapidly. As soon as it exists, it doesn't.

s-block elementsare theelementsfound in Group 1 and Group 2 on the periodic table. Group 1 are the alkali metals which have one valence electron. They have low ionization energies which makes them very reactive. Group 2 is the alkali earth metals which have two valence electrons, filling theirssublevel.

a)An endothermic reaction takes place when a great amount of energy is needed to break the existing bonds in the reactants. It means that an endothermic reaction needs or takes in energy to continue.example:In a test tube, when a small quantity ofammonium chloride(NH4Cl) is dissolved in water, the tube becomes colder. Heat is absorbed from the surroundings during the chemical reactionNH4Cl(s) + H2O(l) →→ NH4Cl(aq) – heat.b)A combination reaction is one in which two or more reactants combine to form a single product.Examples:formation of calcium oxide by the combination elements calcium and oxygen.2Ca + O2→2CaOc)Abalanced equationis anequationfor achemicalreaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.example:6 CO2+ 6 H2O → C6H12O6+ 6 O2(balanced equation forphotosynthesis)d)Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.example:Fe + CuSO4 >>>>>>FeSO4 +Cu

Some groups, such as the alkyl group, are less electron-withdrawing than hydrogen and are therefore considered as electron-releasing. This is an electron-releasing character and is indicated by the +I effect. In short, alkyl groups tend to give electrons, leading to the induction effect.

Hence COOH is more electronegative.

thanks ... exactly ..

The two characteristics are:1. Tetravalency - Tetra stands for 4 and valent stands for valency.2. Catenation - catenation means self bonding and the formation of long chains.

Please specify the question

The electronic theory of valency explains about the cause of chemical reaction/combination on the basis of valence shell electron (i.e electron present in the outermost orbit) & tendency to lose or gain an electron. The outermost shell of an atom is called valence shell &electron present in it is called valence electron. The valence electron of an atom is denoted by Lewis dot symbol.

The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state.

Option C is correct..

option c Cassiterite is not an ore of iron.

the answer

is

1) Boyle's law

a law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature

2) Charles law

a law stating that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.

3). Gay-Lussac's law, Amontons'lawor the pressurelawwas found by Joseph LouisGay-Lussacin 1809. It states that, for a given mass and constant volume of an ideal gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature.

4. Dalton's law states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases

D is the answer of the question

D is the right answer

Law of gravitation is right

low of gravitation is right answer

right answer is law of gravitation

D is the correct answer

first law of motion is correct

Because the particles inliquidsare very close together (barely further apart than insolids)liquids do noteasily compress, so their volumeis fixed.Gasescan also flow, so occupy theshapeof their whole container. Theydo not haveafixed shape. ...Gasestherefore can be compressed or expanded

Solids have fixed shape and size because of its molecules are so tightly packed and they cant moove freely on the other hand gases and liquids do not have fixed shape and size because their molecules are not closely packed and they are free to moove

solids have fixed shape and size because of its molecule are so tightly packed and they can't move freely on the other hand gases and liquid do not have fixed shape and size because their molecules are not closely packed and they are free to move

Beacause the solid has more particles & liquid & gases have less particles

because the solid has more particles and liquid and gases have less particles than solid

what is the meaning of C in your answer

and thanks for helping me

H2 + CL2-> 2HCL22.4 L 22.4 L 2×22.4

22.4 Litres hydrogen reacts with 22.4 litre of chlorine to give 44.8 L of HCLthe given volume of chlorine is 11.2 Lhere chlorine is the liming reagents as its . first consumed22.4 Litre of chlorine gives 73 litre of HCLso , 11.2 l gives 44.8/22.4 × 11.2 = 22.4 of HCL is formedthat means no. of mole = 1because 1 mole of any gases occupies 22.4 L at STP

the answer is A . 1 mole of HCL (g)