Explore topic-wise InterviewSolutions in .

Protons are subatomic particles that, with neutrons and electrons, are the principal constituents of atoms.

Protons are positively charged particles that reside in the nucleus of an atom. These protons add the overall positive charge of a molecule. The mass of the proton is 1.6727g x 10 raised to -24, the electron 9.110g x 10 raised to -28.

Through scientific discovery, protons have been accepted as the particle that contributes to the positive charge of an atom. The discovery of protons can be attributed to Rutherford.

In 1886 Goldstein discovered existence of positively charged rays in the discharge tube by using perforated cathode. These rays were named as anode rays or cannal rays.

In 1899, Rutherford discovered alpha and beta ‘rays’ from uranium. He later demonstrated that alpha rays are the nuclei of helium atoms. He discovered in 1914 that the nucleus of an atom constituted and extremely dense but small fraction of the volume of an atom and that this nucleus was positive in charge.

Given the discoveries of electrons in 1897 by Thomson, Rutherford and other scientists decided that a positively charged particle must exist to center the electron to create equally neutral atoms.

Thompson proposed the name ‘positive rays’. Rutherford, in 1914, suggested that this something that was positively charged or the sportive ray of Thompson was a particle.

He gave the name ‘positive electron’ to it. The word ‘proton’ was assigned to this particle by 1920.

Rutherford continued to do research until his death, but the proton was his last big discovery.

option b because it has electron pair to donate

answer is correct but explaination is wrong

sorry it has no electron loan pair to donate

18.b19.b20.c as it is clear from above

see 21.(NH4)2NO22.loss of electron23.precipitation24.chemical25.endothermic if any doubt is there then plz comment

An earthen pot has a large number of extremely small pores on its wall. Some of the water, continuously keeps seeping through these pores. This water evaporates continuously and absorbs its latent heat, required for vaporization from the earthen pot and the remaining water in the pot. In this way, the remaining water loses heat and gets cooled.

from the reactivity series... metal coming up the Zn will not be reduced..

so,. Al is the answer..

which non metal is good conducter of heat except diamond and graphite.????

quickly

no. of d - electrons in Fe2+ = 6

and for option D , p electrons = 2p6 +3p5

so, option D is the answer.

Bulb of a thermometer is always kept above the surface of water while determining the boiling point so as to make sure that the bulb doesn't breaks due to very high temperatureif the bulb is kept inside the boiling water it may break and the temperature cannot be taken.

It is insoluble inwater, but soluble in carbon disulfide. It takes fire spontaneously in air, burning to the pentoxide Whitephosphorusshould bekeptunderwater, as it is dangerously reactive in air, and it should be handled with forceps, as contact with the skin may cause severe burns.

thank you god bless you

tank you god bless you

phospohrus is kept in water because it is highly inflamable substance which cathes fir easily when comes in contact witj air

Benzene + HNO3 + H2SO4 react to p-nitrobenzene

1)A will be RNH2 here in this case it is CH3NH2 2)B is CH3Cl 3)C is CH3CN4)D is CH3NH2 again.

Awater moleculeisformedwhen two atoms of hydrogen bond covalently with an atom of oxygen. In a covalent bond electrons are shared between atoms. ... It is this polar property that allowswaterto separate polar solutemoleculesandexplainswhywatercan dissolve so many substances.

tysm

Hydrogenresembles both alkali metals and halogens. It can lose one electron like alkali metals and also gain one electron like halogens. Therefore,position assigned to hydrogen in the periodic tableisconsidered anomalous.

Two conditions whichpromotescorrosion are :

(i)Substanceis exposed to air, water

(ii) Metal getsoxidisedto metal oxide.

CO2 has --- 6+8+8 electrons = 22 electrons

so, X+ , Y2+ and Z- should also have 22 electrons

=> proton of X = 22+1( +ve charge) = 23=> proton of Y = 22+ 2( +2 ve charge) =24=> proton of z = 22-1 ( -ve charge) =21

so, correct order is Y2+ > X+ > Z-option 3.

speed = frequency * wavelength

wavelength =speed/frequency

= 344 /120000

= 0.00286 m

Like my answer if you find it useful!

When electric current is passed through water , it decomposes to give hydrogen gas and oxygen gas.

ELECTRICITY2H₂O(I) ---------------------------- > 2H₂(g) + O₂(g)

At cathode :H+ ions will gain electrons and form Hydrogen gas

2H⁺ +2e--->H2 (g)

At anode : Oxygen gas will be released

4 OH⁻(aq)→O2(g) + 2 H2O(l) + 4 e−

II) The volume of hydrogen gas collected at cathode is more than volume of oxygen gas at anode because water is made up of 2 parts of hydrogen and 1 part of oxygen by volume.

iii) If dil.H2SO4 is added to water then the rate of electrolysisincreases.

Please hit a like if you find it useful

C no answer is correct or not ??

(a) The physical state of the matter can be changed either by melting or boiling.(b) The diagram below shows the “states of matter triangle” that demonstrate the inter-conversion of states of matter.

(c) The evaporation of liquids can be increased: (1) Increasing the temperature of liquid (2) Increasing the surface area of liquid (3) Increasing the wind speed

by increasing temperature and by increasing pressure

We know that resistivity = m / (nte^2)

and e are properties of electrons and remain constant.

METALSIn metals, n i.e., the number of electrons in unit volume of the conductor is almost independent of temperature. However, t i.e., the relaxation time does vary with temperature. When temperature increases, the thermal speed of the electrons increases as well as, the amplitude of vibration of the positive ions inside the metal conductor also increase, about their mean positions. Thus, the collisions between the electrons and the positive metal ions become more frequent and this decreases the relaxation time, t, leading to an increase in the resistivity of the conductor.

Magnesium ribbon mustbecleaned before burningin air so that the layer ofmagnesiumoxide (which is formed due to reaction ofmagnesiumwith air) can be removed in order to get the desired chemical reaction.

Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbant surface. Examples include macroscopic phenomena that can be very obvious, like corrosion, and subtler effects associated with heterogeneous catalysis.Chemisorptionis a kind ofadsorptionwhich involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbant surface. Examples include macroscopic phenomena that can be very obvious, likecorrosion, and subtler effects associated withheterogeneous catalysis. The strong interaction between theadsorbateand thesubstratesurfacecreates new types of electronicbonds.

thank u very much.

(i)Mercury

(ii)Aluminum

(iii)Zinc oxide (ZnO) is an amphoteric oxide.

What is your question here?

1.Aluminium sulphate2.calcium chloride3.potassium sulphate4.potassium nitrate5.calcium carbonate.

sorry by mistake wrong question

but thanks

Any of the group ofreagentsproduced by the interaction of magnesium and an organic halide, usually in the presence of an ether, and having the general formula RMgX, where R is an organic group and X is a halogen: used in theGrignardreaction.

Croprotation isoneof themethods of crop productionthat ensures high yield.

It is themethodof growing two or more varieties ofcropson the same land in sequential seasons.

Nh3 should be correct.. because NH3 doesn't gives H+ in water..

but in answerkey its answer is OH-

1.The purpose of using desiccators is to absorb moisture. Anhydrous Calcium chloride (CaCl2) has a capacity of absorbing moisture as it is hygroscopic in nature, so it is used as a desiccators.

efflorescent substance is cement.

2. a) CuSO4.5H20 and b) NaCl

An Elastomer is a polymer with the physical property of elasticity. Elastomer is a term derived from elastic polymer, which is often used interchangeably with the term rubber. Each of the monomers linking to the polymer is usually made of carbon, hydrogen, oxygen and/or silicon. Elastomers are usually thermosets requiring a curing process of rubber involving heat and the addition of sulfur or other equivalent curatives. In addition, elastomers might also be thermoplastic.

An Elastomer is a polymer with the physical property of elasticity. Elastomer is a term derived from elastic polymer, which is often used interchangeably with the term rubber. fibers are a subset of the larger area of textiles. Textiles can be natural or synthetic.

Examples of synthetic polymersinclude nylon, polyethylene, polyester, Teflon, and epoxy.Natural polymersoccur in nature and can be extracted. They are often water-based.Examples ofnaturally occurringpolymersare silk, wool, DNA, cellulose and proteins.

Correct Answer:

N, O, F

Explanation:

N, O and F (p-block elements) are highlyelectronegative non metals and will have thestrongest tendency to formanions bygaining electrons from metal atoms.

thanks

Alkali metals are good reducing agents. This is because of their tendency to lose electrons.

In a group from top to bottom reducing nature increases. Since ionization energies decreases on moving dowm from Li to Cs the reducing property increases. Hence, Li is the weakest reducing agent among the alkali metals in free state.

Whereas Li acts as strongest reducing agent in solution.Thus, in solution the reducing nature decreases from Li to Na and then increases to Cs.

short ans

nivu tumb cute

Strongest Bronsted base has the weakest conjugate acid. Hence, CN- is the strongest base as HCN is a weaker acid than HCl and HI

Contact processStep 1:Preparation of sulphur dioxide:

SO2is prepared by burningsulphurin the presence of excess air so that the product combines with oxygen which is helpful for the next stage.

S(s) + O2(g) → SO2(g)

Step 2:Preparation of sulphur trioxide:

Sulphur trioxide is formed when sulphur dioxide reacts with oxygen in a ratio of 1:1 at a temperature of 400°C – 450°C and a pressure of 1-2 atm in the presence of N2O5as a catalyst. This reaction is reversible in nature.

2SO2(g) + O2(g) ⇌ 2SO3(g)

Step 3:Preparation of concentrated sulphuric acid:

The sulphur trioxide formed is first made to react with concentrated sulphuric acid. Sulphur trioxide cannot be dissolved in water directly as it leads to the formation of fog. The product obtained after this reaction is known as oleum. The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid.

H2SO4+ SO3(g) → H2S2O7(l)

H2S2O7(l) + H2O(l) → 2H2SO4

Contact processStep 1:Preparation of sulphur dioxide:

SO2is prepared by burningsulphurin the presence of excess air so that the product combines with oxygen which is helpful for the next stage.

S(s) + O2(g) → SO2(g)

Step 2:Preparation of sulphur trioxide:

Sulphur trioxide is formed when sulphur dioxide reacts with oxygen in a ratio of 1:1 at a temperature of 400°C – 450°C and a pressure of 1-2 atm in the presence of N2O5as a catalyst. This reaction is reversible in nature.

2SO2(g) + O2(g) ⇌ 2SO3(g)

Step 3:Preparation of concentrated sulphuric acid:

The sulphur trioxide formed is first made to react with concentrated sulphuric acid. Sulphur trioxide cannot be dissolved in water directly as it leads to the formation of fog. The product obtained after this reaction is known as oleum. The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid.

H2SO4+ SO3(g) → H2S2O7(l)

H2S2O7(l) + H2O(l) → 2H2SO4

hindi ma

Cellulose

7 is the minimum number of carbon atoms required for three branched alkanes. Explanation:The branches cannot be on the first and last (outermost Carbon atoms) and hence two get three branches two carbon atoms are required to be present between the first and last C-atoms. Hence, the main chain will have 4 C-atoms and 3 chains with one C-Atoms each.

Latent heat of fusion is the amount of energy required to convert the substance from solid phase to liquid phase at constant temperature. The boiling point of a substance increases. Whereas the freezing point of a substance decreases due to presence of impurity.Dry ice is the solid form of carbon dioxide.It is stored under under high pressure because if the pressure is decreased then it will sublime.

A polymer is a largemolecule made up of chains or rings of linked repeating subunits, which are called monomers.

In case of fcc lattice number of atoms per unit cell z=4 atoms

Therefore,M= d*NA*a^3/zM= 8.92*6.023×1023*(3.608×10−8)^3/4 = 63.1g/mol∴ Atomic mass of copper =63.1 g/mol

Since mass is same ,and mass = vol.density

so (volume of A)* (density of A) = (volume of B)*(density of B) => v*(0.660) = 80*(1.59) => v = 80*(1.59)/0.660 = 192.7272... = 193cm³.

Starchis a food reserve in plants just like glycogen in animals..It the main storage polysacccharide of plants which is polymer of alpha-glucose and consist of two components-1.Amylose-It is thelinear polmer of alpha-glucoseand water soluble fraction.2.Amylopectin-It consist ofbranched chains of alpha-glucoseand insoluble fraction.