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option a is the answer.KE is the energy with which the electron moves in the orbit hence The energy is same but positive so answer is 3.4eV

1 mole of Ammonia is 17gm.

{NH3= N(14gm)+ H(1gm)+H(1gm)+H(1gm)}

Now 1 mole of any substance at STP always has Avogadro's number of molecules i.e. 6.023*10^23.

So 1 mole or 17gm of Ammonia will have 6.023*23 molecules of NH3.

Here it's 4.25gm or 4.25/17= 0.25moles of Ammonia.

Therefore 0.25 moles of Ammonia will have 0.25*6.023*10^23 molecules.

As 1 molecule has 4 atoms. (1 of Nitrogen and 3 hydrogen),

We will have 4* 0.25* 6.023*10^23 atoms in 0.25 moles of Ammonia.

Answer is 4.25gms will have 6.023*10^23 number of atoms in it.

the third statement is incorrect because one mole of hydrogen gas contain 12.04*10^23 atoms.and Avogadro's number of molecules.

12400/E(in eV) =12400A

Bases change the colour of litmus from red to blue.

They are bitter in taste.

Bases lose their basicity when mixed with acids.

Bases react with acids to form salt and water. This process is calledNeutralisation Reaction

They can conduct electricity.

Bases feel slippery or soapy.

Some bases are great conductors of electricity.

Bases like sodium hydroxide, potassium hydroxide, etc are used as electrolytes.

Alkalis are bases that produce hydroxyl ions (OH-) when mixed with water.

Strong alkalis are highly corrosive in nature whereas other alkalis are mildly corrosive.

The pH value of bases ranges from 8-14.

All prokaryotic cells have a stiffcell wall, located underneath the capsule (if there is one). This structure maintains the cell’s shape, protects the cell interior, and prevents the cell from bursting when it takes up water.

The cell wall of most bacteria containspeptidoglycan, a polymer of linked sugars and polypeptides. Peptidoglycan is unusual in that it contains not only L-amino acids, the type normally used to make proteins, but also D-amino acids ("mirror images" of the L-amino acids). Archaeal cell walls don't contain peptidoglycan, but some include a similar molecule called pseudopeptidoglycan, while others are composed of proteins or other types of polymers

answer (d) is thecorrect answer

option (D) is a correct answer

answer D is the correct answer

The ion formed by losing that one electron will be a positive ion with +1 chargeexplanation- an atom contains equal amount of positive proton and negative electron .now 1 electron get removed which means that no. of proton is one more than no. of electron and so, it will form positive ion with +1 charge .

PH3(Phosphine) is a hydride of Phosphorus. Phosphine is a gas and has pyramidal structure. Phosphorus involved is sp3hybridized.

Now both PH4+and PH3have sp3hybridization state for phosphorous .In PH4+,all the four orbitals are bonded, whereas in PH3,there is a lone pair of electrons on Phosphorous .In PH4+, the HPH bond angle is tetrahedral angle of 109.5°.But in PH3,lone pair- bond pair repulsion is more than bond pair-bond pair repulsion so that bond angles become less than normal tetrahedral angle .The bond angle in PH3is about 93.6°.

Balanced chemical equation is:

4P4+ 12OH-+ 12H2O= 4PH3+ 12H2PO2-

Thebondpair inNH3is close to N in N-Hbond thanthebondpair in P-HbondinPH3. This is because the size of the nitrogen is smallthanphosphorus . As a result , the force of repulsion between the bonded pair of electrons inPH3is morethaninNH3. Therefore thebond angle in PH3molecule lesserthaninNH3.

asymmetric carbons are chiral carbons having all the valancy different

so, here the structure is OH OH | | HOOC-C-C-COOH | | H H

=> both the centre carbons are chiral so, 2 is ✓

CH3OHas in alcohols primary alcohols more acidic than rest.This is because the strength of thealcoholas anacidis dependent on the corresponding strength of its conjugate base, the alkoxide ion.

The balanced reaction is 4Al + 3O2= 2Al2O3

​3moles of O2requires 4 moles of Al0.5 moles of O2requires = 4 X 0.5/3 = 2/3 moles of Al

Mass of 2/3 mol of Al = 2/3 mol X 27g/mol= 18 g

Where 27 is the mass of 1 mole Al

Answer:18gm

To find the bond enthalpy, you subtract the energy of the bonds formed (since they release energy) and add the energy of the bonds broken (since you need to supply energy).

1/2 an N2 bond is 941/2 = 470.5 kJ/mol3/2 H2 bonds = 3×436/2 = 654 kJ/molTotal energy = bonds broken-bonds formed = (470.5 + 654) - 3(N-H)

Total energy = -46.3 kJ/mol

Therefore, -3(N-H) + 1124.5 = -46.3

3(N-H) = 1124.5 + 46.3 = 1170.8

(N-H) = 1170.8/3 = 390.2667 ≈ 390 kJ/mol

Remember: total energy of reaction = (total energy of bonds broken) - (total energy of bonds formed)

Nitrogen present in 1 mole ammonia =1 mole=14gSo nitrogen present in 0.5 mole ammonia =14g×0.5=7g

Balanced Chemical equation:

2NH4Cl(s) + Ca(OH)2(s) -----> CaCl2(s) + 2NH3(g) + 2H2O(l)

Water is the best option to stop the burning sensation

milk is the best option, as it will neutralize the effect.

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Let us write the balanced equationN2 + 3H2 → 2NH3Now calculate the number of molesNumber of moles of N2 = 50 kg of N2 = 50 X 10 3 g/1 kg x 28g = 17.86 x 10 2 mole

Number of moles of H2 = 10 kg of N2 = 10 X 103 g/ 1 kg x 2 = 4.96X 103 mol

According to the above equation 1 mole of N2 reacts with 3 moles H2.That is 17.86 x 10 2 mole of N2 reacts with ------moles of H2= 3/1 X 17.86 x 10 2 = 5.36 x 103 moles.Here we have 4.96X 103 mol of hydrogen. Hence Hydrogen is the limiting reagent.Let us calculate the amount ammonia formed by reacting 4.96X103 moles Hydrogen 3 moles of hydrogen -------2 moles of NH34.96 x103 moles Hydrogen -----?= 4.96 x103 X ⅔= 3.30 x 103 moles of NH3

part 1

160 gram of 2SO2 = 32 gram of O2Therefore , 1gram of SO2 = 32?160?1tonne=0.2 tonne

Option b)Chromium and Nickel.

Brass

Ans :- The Williamson ether synthesis is an organic reaction, forming an ether from an organohalide and a deprotonated alcohol. This reaction was developed by Alexander Williamson in 1850. Typically it involves the reaction of an alkoxide ion with a primary alkyl halide via an SN2 reaction.

Ans :- TheWilliamsonethersynthesisis an organicreaction, forming an ether from an organohalide and a deprotonated alcohol (alkoxide). Thisreactionwas developed by AlexanderWilliamsonin 1850. Typically it involves thereactionof an alkoxide ion with a primary alkyl halide via an SN2reaction.

Commercial unit of energy is the kilowatt-hour (kWh).

copper sulfate + sodium hydroxide → copper hydroxide + sodium sulfate

CuSO4+ 2NaOH → Cu(OH)2+ Na2SO4

(blue solution +colourless solution → blue precipitate +colourless solution)

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Steps of Balancing a Chemical Equation

Identifyeach elementfound inthe equation. The number of atoms of each type of atom must be the same on each side of the equation once it has been balanced.

What is the net charge on each side of the equation? The net charge must be the same on each side of the equation once it has been balanced.

If possible, start with an element found in one compound on each side of the equation. Change the coefficients (the numbers in front of the compound or molecule) so that the number of atoms of the element is the same on each side of the equation. Remember, to balance an equation

Dogs have high body temperature.To regulate their body temperature dogs hang out tongue in summer.Dogs have fewer sweat glands to sweat and regulate the temperature.

The metals copper, platinum, silver gold are also less reactive when compared to hydrogen even they do not replace hydrogen from water or acid.

For Examples for metal-displacement reactions: iron from ferrous sulphate solution and Zinc can displace copper from copper sulphate solution, hence zinc is more reactive than iron and copper.

Al2 (SO4)3 + Zn ---- No reaction. FeSO4 + Zn ------------ ZnSO4 + Fe

Element A is a Non-Metal because group 18 contain all Noble elements.

b- Atomic radius decreases in moving left to right in a period . this is due to increse in nuclear charge which tends to pull the electron closer to the nucleus and reduce the size of the atom.

Copper reacts with carbon dioxide in air to form copper carbonate. As a result, copper looses its shiny brown surface forming a green layer of copper carbonate.

The citric acid present in the lemon or tamarind neutralizes the basis copper carbonate and dissolves the layer. Therefore, tarnished copper vessels are cleaned with lemon pr tamarind juice to give lusture to the surface of the copper vessel.

While Preparing Dilute Sulphuric Acid ina Laboratory,Acidisadded slowlytowater(Wateris neveraddedto theacidas it will be the exothermic process which can cause Fatal to the person) with constant stirring because it will not cause any harm to the Person or any Apparatusinthe laboratory.

Ans :- Nitric acidreacts withaluminiumand forms a protective layer i.e. Al2O3. This protective layer makesaluminium unreactive towardsHNO3and therefore, itcan be stored in aluminium containers.

option 4 is correct.

in all the case one element is reducing and oxidizing. this is called as disproportionation

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