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Thealkaline earth metalsare denserthanthealkali metalsdue tosmaller sizeand better backing in the crystal lattice.

The densities ofalkaline earth metaldo not show any regular trend with increasing atomic number.

The density of thesemetalfirst decreases from Be to Ca and then increases from Ca to Ba.

The elements in Group 1 (lithium, sodium, potassium, rubidium, caesium, and francium) are called thealkali metals. All of thealkalies metals have a singleselectronin their outermost principal energy. For example, theelectron configurationof lithium (Li), thealkali metalof Period 2, is 1s2 2s1.

Alkali, any of the soluble hydroxides of the alkali metals—i.e., lithium, sodium, potassium, rubidium, and cesium. Alkalies are strong bases that turn litmus paper from red to blue; they react with acids to yield neutral salts; and they are caustic and in concentrated form are corrosive to organic tissues.

BO = (5-0)/2 = 2.5

it is paramagnetic , because of 1 unpaired electron

Molalityis no of moles of solute dissolved in 1kg of solvent. While Molarity is no of moles of solute dissolved per litre of solution. AsMolalityinvolves mass and molarity involves volume…. As volume changes with temperature but mass doesn't……that's whyMolalityispreferredover molarity to express concentration.

Business is defined as the human activity directed towards acquiring or producing the wealth by selling or purchasing the product. it is the process of activity conducted with an objective of earning profits under uncertain market conditions.Characteristics of business: three main characteristics- 1.individuals working together2.business must satisfy the societal need3.must seek to make profit

homologous seriesis define as the difference of CH2 so for A = CH3CHO+CH2= and so on hope this will help you like my answer

Equivalent mass of C2H2O4.2H2O = 126/2 = 63Normality of oxalic acid = 6.3/63 * 1000/250 = 0.4 NWe know that,N1V1= N2V2Where N1is normality of oxalic acidV1is volume of oxalic acidN2is normality of sodium hydroxideV2is volume of sodium hydroxideTherefore,0.4 * 10 = 0.1 * V2V2= 40 ml.Therefore 40 ml of NaOH is required to completely neutralize 10 ml of oxalic acid.

1. Beyond this value,boronwill become unstable and not be able toform BF6 3-ions.

Boronis a non-metallic element. It is electron-deficient. It does not possess d orbitals in its valence shell.

ii. The main reasons are;due to smaller size of F as compared to Cl , six smallF atoms can be easily accommodated around si atom while cl cannot since f are present in smaller 2p orbital and cl are present in larger 3p orbital therefore interaction of f lone pair electron with d orbitals of silicon are stronger in f ascompared cl

Nitric acid reacts with aluminium andformsa protective layer i.e. Al2O3. This protective layer makes aluminium unreactive towards HNO3 and therefore, it can be stored in aluminium containers.

3 ans of this question

3 valency of this confugration

valency for this configuration is 3

Theperiodic tableis a tabular display of the chemicalelementsorganized on the basis of their atomic numbers,electron configurations, and chemical properties. ...Elementswith the same number of valence electrons are kept together in groups, such as the halogens and the noble gases.

If the outermost shell of an atom has a total of 8 electrons then the atom is said to have attained a complete octet. An atom has to gain, lose or share a particular number of electrons from its outermost orbit to obtain complete octet. Therefore, a capacity of an atom is the total number of electrons gained, lost, or shared to complete its octet arrangement in the outermost atom. This capacity of an atom will also determine the valency of an atom.

For instance, hydrogen has 1 electron in its outermost orbit so it needs to lose 1 electron to attain stability or octet. Thus, the valency of hydrogen is 1. Similarly, magnesium has 2 electrons in its outermost orbit and it needs to lose them to attain octet and obtain stability. Therefore, the valency of magnesium is 2.

Valency can be known throuugh their outermost cell .

Convert no of atoms to moles moles = No of atoms/Avagadro's numbermoles = (3.011*10^22)/(6.022*10^23)moles = 0.05

moles = given mass/atomic mass0.05 = 1.15/atomic mass

atomic mass = 1.15/0.05 = 23Element weight = 23

thank you sir

The atomic number is 15 therefore electronic configuration = (2,8,5)

It gains 3 electrons to fill it's last shell with octate structure(eight electrons in outer shell) .

1 atom of nitrogen will weigh = 14gm

also 1 molecule of oxygen has weight = 32gm.. this is maximum.

so, option B

n atoms of A weigh = 15gnA =15g ( 1)4n atoms of B weigh = 45gatomic weight of B = 304n*30=45 n =3/8substituting value in 13/8A =15A =40u

Thevan der Waals equation for n molesof agasis (p+(((n^2) (a))/V^2 ))(v? nb)=nRT where p is pressure, V is Volume, and T is the temperature ofgas. The constant R is the universalgasconstant and a and b are positive constants that are characteristics of a particulargas.

a)increases with increase in temperature, (b) The higher the value of KH, the lower is the solubility of gas in the liquid.

1 .increase with increase in temperature. 2. decrease with decrease in temperature .3 . remains constant.4. first increase then decrease.

'A sole trader is a person who sets up and owns their own business. They may decide to employ other people but they are the only owner. A sole trader has unlimited liability.' As a sole trader, your business is owned entirely by you, grown by you and ultimately succeeds or fails by you

Like my answer if you find it useful!

When acetone and chloroform are mixed together a hydrogen bond is formed between them which increases inter molecular attraction between them and hence decreases the vapour pressure. This is the reason that resultant solution shows negative deviation.

In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean.

F is much more electronegative than Cl hence has much stronger hydrogen bonding, which stabilizes the structure with FA mixture of molten KF and HF is hence chemically K+ [HF2]- and is used in moisson method to extract F2 which was chemically almost impossible.

Further, [HF2]- involves strongest symmetric 3c-4e hydrogen bonding.

the gas at home is l.p.g gasand in hospital oxygen I am right so please like it

Is it reacts with CO2?

Calcium carbide, also known ascalcium acetylide, is achemical compoundwith thechemical formulaofCaC2. Its main use industrially is in the production ofacetyleneandcalcium cyanamide.

nice answer.............

nice answerrrrrr..........

thanks

(C)Calcium carbide reacts with water to produce ethyne gas, CaC2 (s) + 2 H2O (l) ----> Ca(OH)2 (aq) + C2H2

In this reaction the reduction of air is about 400 ml because 4 molecules per mole are used to form H20

Thehydrolysisofaluminum carbideis an irreversible reaction. When this reaction takes place, methane and aluminum hydroxideare released.

Calciumcarbidereacts withwaterto produce acetylene gas, C2H2. CaC2 (s) + 2 H2O (l) ----> C. Calciumcarbidereacts withwaterto produce acetylene gas, C2H2.

Answer: c) Methyl magnesium bromideExplanation:CH3-I + Mg + H2O → CH4 (Water would protonate the Grignard reagent).Methane (CH4) can be obtained from methyl iodide (CH3I) by reduction with LiAlH4 or other hydride reducing agents.

HgSO4in presence of any acid for eg:dil. H2SO4adds a water molecule to the compound, here acetylene/ethyne.Water is then added according to Markownikoff's addition....Acetylene + H2O -------(Hg+and H+)-----> H​3C=CH(OH)Again more water molecules are added.....thus now the C atom has 2 -OH ions......making it unstable..[ CH3-CH(OH)2]Thus formingCH3CHO (ethanal).

which option

wrong ans

option 2

Number of moles is amount given/molecular mass=212/106=2moles

The valance factor of MnO4- is 5 in acidic medium.and for ferrous oxalate it will be 2 so moles× valance factor of MnO4- = moles×Valance factor of ferrous oxalate. => n*(5) = 1*2 => n = 2/5 = 0.4 moles.

4. is the correct answer

option (3) is right answer

Answer:1)3Explanation:

SO2+O3---->SO3+O2This shows 1mole of O3 gives 1mole of O2Hence 3 mole of O3 gives 3 moles of O2

how is ethanol formed

It is a basic stoeichemistry. One H+ needs one OH- ions to neutralise

H2SO4 ----> H+ + HSO4-

NaOH + H+ ---> Na + H2O

The answer is 2

option 1 is correct answer

Here is the right answer. Sorry for the confusion earlier.

Here is the right answer. Sorry for the confusion earlier.

I could not understand this sentence. explain briefly.