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option C is the correct answer.

b. sharing of electrons

Let total sum of moles be 1 mole

and sum of mole fractions of all = 1

At equilibrium no. of moles of PCl3 will be same as that of Cl2.

also given mole of PCl5 = 0.4/1 = 0.4 and mole of Cl2 = 0.3/1 = 0.3 moles

so, mole fraction of PCl3 will also be 0.3 moles

option A

1. Metal M3 is more reactive than metal M4.

2. This is because, metal M3 replaces M4 from its salt solution, while M4 cannot do so.

3. Thus, M4is less reactive than M3.

Ans :- Place one end of thewirein a vice. Use a mounted vice or clamps to hold thewire.

Slice into theinsulationwith a sharp blade. Put on a pair of heavy gloves before you start to cut.

Pull theinsulationaway from the metal conductor.

Purchase awire strippingmachine for big jobs.

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24g of C(12) has maximum number of Atoms.

Explanation:

Rest of the options have only one mole of atoms. However, 24g of C(12) has 2 moles of atoms.

option A

Ans :- Mass of solute - NaCl =40gmMass of solvent - water =320gmMass of solution =(40+320) gm=360gmConcentration in terms of Mass by mass percentage =(mass of solute /mass of solution) *100=(40/360)*100%=11.11%

Mass of solute - NaCl =40gmMass of solvent - water =320gmMass of solution =(40+320) gm=360gmConcentration in terms of Mass by mass percentage =mass of solute /mass of solution *100=40/360*100%=11.11%

Mass of solute(salt)=40gmass of solvent(water)=320gWe know,Mass of solution =mass of solute+mass of solvent =40g+320g =360gmass percentage of solution =mass of solute÷mass of solution ×100 =40÷360×100 =11.1%

Given:Mass of solute(NaCl)= 40gmMass of solvent (water)=320gmTo find: Concentration in terms of mass by mass percentageFormula used: Concentration in terms of mass by mass percentage=Mass of solute/mass of solution * 100solution:Mass of solution=(40+320)=360gm Concentration in terms of mass by mass percentage=40/360 *100=11.11%Answer:=11.11%

Rectified spirit, also known as neutralspirits,rectifiedalcohol, or ethyl alcohol of agricultural origin is highly concentrated ethanol that has been purified by means of repeated distillation in a process calledrectification. In particular, large quantities of neutral alcohol are distilled from wine

the branch of knowledge that deals with the state and systems of government; the scientific analysis of political activity and behaviour.

Ca²+, Mn²+, Mg²+ are some examples of positive radicals.

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1.Seleniumis a constituent of more than two dozen proteins that play critical roles in reproduction, thyroid hormone metabolism, and DNA synthesis.

2.Chlorineas chloride ion is an essential component of most bodily fluids.

3.Iodineis essential to life. It is part of the thyroxine molecule, a thyroid gland hormone that controls growth.

4.Boronis required for the maintenance of bone and normal blood levels of estrogen and testosterone.

5.Siliconis necessary for molecules that are involved in bone formation, cartilage composition, and cartilage calcification.

6.Bromineas is the most recent addition to the list of essential nonmetals. The bromide ion is a cofactor that enables an enzyme involved in the formation of collagen.

non metal Like nitrogen is used in fertilizers graphite is used as a good conductor of electricity gold and silver is used for making jewellery cooper is used for making electrical wires,cooking utensils

Non-metalslike nitrogen isusedin fertilizers. Graphite isusedas a good conductor of electricity. Gold and silver areusedfor making jewellery. Copper isusedfor making electrical wires, cooking utensils etc.

Five Metals

Metalsusually are hard, dense conductors, often exhibiting a shiny metallic luster.Metallic elementsreadily lose electrons to form positive ions. Except for mercury, metals are solids at room temperature and pressure. Examples include:

ironuraniumsodiumaluminumcalcium

Metals' uses are directly linked to their qualities. For example:

Shiny metals such as copper, silver, and gold are often used for decorative arts, jewelry, and coins.Strong metals such as iron and metal alloys such as stainless steel are used to build structures, ships, and vehicles such as cars, trains, and trucks.Some metals have specific qualities that dictate their use. For example, copper is a good choice for wiring because it is particularly good for conducting electricity. Tungsten is used for the filaments of light bulbs because it glows white hot without melting.

wrong answer

★ Gold and silver are used for making jewellery.

★ Copper is used for making electrical wires, cooking utensils etc.

★ Zinc is mainly used as a protective coat for iron.

★ Aluminium is used for making electrical cables, packaging, cooking utensils,etc.

★ Metals like iron and steel are widely used in building and home constructions

Ans :- The most significant uses of coal are in electricity generation,steel production, cement manufacturing and as a liquidfuel. Steam coal - also known as thermal coal - is mainly used in power generation. Coking coal - also known as metallurgical coal - is mainly used insteel production.

Addition operations are denoted by the + sign. The addition operator (plus sign) will take any two numbers, called addends, as operands to work on. The result is called the sum of the two numbers. The operation of addition is commutative.

homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain.

Names of first four Homologous series of alcohols are:--methanol-ethanol-propanol-butanol

Homologous series is a series of organic compounds where the successive members follow a regular pattern. the successive members differ by a CH2 group.example: alkane group

CH4 - methaneC2H6 - ethaneC3H8 - propaneC4H10 - butaneEach member differ by CH2 group

Homologous series is a series of compounds with similar chemical properties and same functional group differing with the successive member by CH2. The chemical properties of homologous series are similar because they have the same functional group.For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. The general formula of this series is CnH2n+2.

In organic chemistry, a homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain

hai

Mass of the total mixture= 22g(benzene) + 122g(CCL4)=144g

Mass % of benzene=(Mass of benzene/Mass of the total mixture)*100=(22g/144g)*100=15.28%Similarly, Mass % of CCL4=(Mass of CCL4/Mass of the total mixture)*100=(122g/144g)*100=84.72%

In general, Mass% of any component(X) in a mixture=(Mass of component(X)/mass of total mixture)*100

Thank you so much

Alkaliseg: KOH,NAOH

Water is compound of hydrogen and oxygen. water basically cools the combustible material so that its temperature comes down below its ignition temperature. This prevents the fire from spreading, water vapours sorround the combustible material helping in cutting off the supply of air. So fire is extingushed.

3H2O(l)→3H2O(g)3H2O(l)→3H2O(g)

Δng=3Δng=3

ΔE=ΔH−ΔngRTΔE=ΔH−ΔngRT

=3×10−3×500×0.002=27Kcal=3×10−3×500×0.002=27Kcal

The equation is as follows:2Mg + O2 ------> 2MgO(s) (g) (s)Therefore 2 moles of Mg require 1 mole of O2 to produce 2 moles of MgO.Calculate actual moles.moles= mass/ molar massMg= 1/24 = 0.041667O2= 0.56/32 = 0.0175MgO=Mole ratio of Mg: O2 = 2:1find mass of Mg that reacts:that means 2 mole of Mg reacts with 1 moles of O2If 1 = 2Then 0.0175 = 0.0175 x 2=0.035 moles of magnesiummass of magnesium that reacts:mass= moles x molar mass= 24 x 0.0350.84 gThat means that of the 1 gram of magnesium that reacts only 0.84 grams is usedTherefore magnesium is in excess and by 0.16

why we add and subtract the equations and some are multiplied by 2 or 3 why

When an Acid reacts with a carbonate and or bicarbonate, caborn dioxide (CO2) is liberated and when it reacts with a metal (active metal) Hydrogen gas (H2) is liberated. When the metal carbonate(MCO3,M=Metal) reacts with an acid to give out carbon dioxide, water and metal salt with acidic anion is formed.

When carbonate reacts with acid , it forms corresponding salt, CO2 & H2O.Na2CO3 (s) + 2HCl —→ 2NaCl (sq) + H20(l) + CO2 (g)Sodium carbonate ( Metal carbonate) reacts with hydrochloric acid, it forms sodium chloride salt , carbon dioxide & water.A carbonate is negatively charged and contains a carbon bonded to three oxygen atoms. The general reaction results in a salt, carbon dioxide gas, and water. The reactions between carbonates and acids are called neutralization reactions because the acid is neutralized.

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Carbonates are salt of carbonic acid possessing carbonate ion, CO2−3. On the other hand Hydrogen carbonates are formed when CO2 reacts with water.

Ethanoic acid reacts with carbonates and hydrogen carbonates leading to the production of salt, carbon dioxide and water. The salt produced is commonly known as sodium acetate.

Crystallisation is the process of formation of solid crystals from solution, melt or by deposition directly from a gas phase.

Alcohols are compounds in which one or more hydrogen atoms in an alkane have been replaced by an -OH group. Alcohols may be classified as primary, secondary, or tertiary, according to which carbon of the alkyl group is bonded to the hydroxyl group.

Crystallization is defined as a process by which a chemical is converted from a liquid solution into a solid crystalline state.

Tertiary alcohols have greater reactivity with hydrogen halides than secondary alcohols – which in turn have greater reactivity than primary alcohols – in reactions forming alkyl halides. For tertiary alcohols, the reaction proceeds by an SN1 mechanism which prefers a more substituted alcohol. For small primary and secondary alcohols, there is some reactivity by an SN2 mechanism, but the SN1 mechanism with tertiary alcohols is the most reactive.

A. Primary alcohol, incorrect.

B. Secondary alcohol, incorrect.

C. Tertiary alcohol, correct.

D. All alcohols react equally to form alkyl halides, incorrect.

Molality = Moles of solute / Mass of solvent in kg

Molality is given as 1Therefore,1 mole of solute is dissolved in 1 kg of water

Moles of solvent = 1000 g / (18 g/mol)= 55.55 mol

Mole fraction of solute = 1 / (1 + 55.5)= 0.017

Mole fraction of solute is 0.017

Barium metal and fluorine gas will combine in a highlyexothermic reactionto form the salt barium fluoride.

(i) S-Soverlapping:overlappingbetween s-s orbital's of two similar or dissimilar atoms is known as s-soverlappingand forms a single covalent bond. (ii)S-P overlapping:overlappingbetween s- and p –orbital's is known ass-p overlapping.