Explore topic-wise InterviewSolutions in Current Affairs.

The screening effect can be defined as a REDUCTION in the effective nuclear CHARGE on the electron cloud DUE to a difference in the attraction forces on the electrons in the ATOM.

PbI4 does not exist because, During the formatio of Pb-I enough AMOUNT of energy is not released so as to unpair ONE of the 6s^2 electron and EXCITE one of them to HIGHER ORBITAL to have a lone electron around the central atom

Carbon dioxide (CO 2 ) and carbon MONOXIDE (CO) gases are emitted during the combustion of various fuels. ... Carbon monoxide is poisonous because it is capable of forming a COMPLEX with haemoglobin (carboxyhaemoglobin), which ISMORE stable than the oxygen-haemoglobin complex.

Heya Dear !!

Here Is Your Answer----->

1) Due to Rancidity Dairy products and FISH spoils.

2) Lime WATER turns Milky when CO2 is passed
through it because of formation of PPT. CACO3.

1,2-ethandiol is the CORRECT ANSWER.

The CORRECT answer should be the option B - Volatile unstable compound.

Van Arkel method is used for purifying METALS like TI and Zn which are then refined. This method is used to obtain ultra-pure metals. It is also CALLED as Vapor Phase refining. The process involves the decomposition of the metal compound into different unstable substances when heat is supplied. This is called as thermal decomposition.

The metals are converted into unstable metal IODIDES which decompose easily to form pure metals.

Ti + 2I₂ → 500 K + TiI₄ → 1700 K + Ti (Pure metal) + 2I₂

When MnO₂is fused with KOH , a purple green COLORED compound is formed.
see the REACTION :-
2MnO₂ + 4KOH + O₂ ------> 2K₂MnO₄( purple green) + 2H₂O

When 2 moles of MnO₂ is fused with 4 moles of KOH , 2 moles of purple green compound K₂mnO₄ and 2 moles of WATER are formed.

Hence, answer is K₂MnO₄ (purple green)

Hello Dear.

Here is the answer---

••••••••••••••••••••••

Given 》
Density of the Water = 1000 kg/m3

We know,
1 liter of water = 1 kg.
( Since, Density is 1000 kg/ m^3

Thus, 1000 ml of water = 1 kg.
(Since, 1 liter = 1000 ml)

Now, MASS of Water = 1 kg.
= 1000 g.

Molecular mass of the water molecules = 18 grams.

USING the formula,

No.of moles = Mass/ Molecular mass.
= 1000/18 moles.
= 55.56 moles.

For the Molarity,

Using the Formula,

Molarity =
(No. of Moles/Volume in ml) × 1000
= (55.56/1000) × 1000
= 55.56 M.

Thus, the molarity of the water is 55.56 M.

•••••••••••••••••••••

Hope it helps.

Have a GOOD DAY.

E balanced CHEMICAL REACTION for the combustion of iron pyrite is:

4 FeS2 + 11 O2  --> 2 Fe2O3 + 8 SO2

This is a combustion reaction and GENERATES iron (III) oxides.

Hope it helps you..

Since the OPTIONS are not given, I am giving a general answer.

The CORRECT answer should be - (p + a/V²).

The Vander Waals’ equation of state for 1 mole of the non-ideal gas.is DENOTED by the equation -

= p + a / V² (V - b) = RT.

The factor (p + a/V²) is accountable for the inter-MOLECULAR force, whereas the term (V-b) is accountable to the molecular volume.

Moles=mass/GAM
moles=4.68×20^-3/32
so, moles=0.14×10^-3
it means
Moles=1.4×10^-4

This is a question of moles testing the CONCEPT of AVOGADROS CONSTANT.

We begin by getting molar mass of S₈.

Molar mass of one Sulphur = 32g/mol

Molar mass of S₈ = 32 × 8 = 256g /mol

Moles = mass / molar mass

Moles = 64/256 = 0.25moles

AVOGADROS CONSTANT :

1 mole = 6.02 × 10²³ ATOMS

The number of atoms in S₈ :

6.02 × 10²³ × 0.25 = 1.505 × 10²³ atoms.

The answer : 1.505 × 10²³ atoms

As we have bcc STRUCTURE, nearest neighbour distance (d) is related to the edge LENGTH (a) as follows :
d =√3a/2

or a =2d/√3

= (2×365.9) ÷ 1.732
= 422.5 × 10^(-10) cm

for bcc structure , z = 2
for SODIUM M = 23 g/mol
DENSITY ρ = (z × M) ÷ (a^3 × N(a))

= [2 × 23] ÷ [ { 422.5 × 10^(-10) }^3 × 6.02 × 10^23
Density = 1.51 g/cm3

Answer:

Explanation:

=> Here, mixture of NO2 and N2O4 is given. So,

                  N2O4    →    2NO2

initial moles;      1            0

at EQUILIBRIUM;   1−X         2x

TOTAL moles at equilibrium = 1−x +2x = 1+x

Molecular weight of equilibrium mixture = 2 * 34.5 (V.D.) = 69

Molecular weight at initial = 92

=> THUS, the value of x can be calculated as:

initial moles / moles at equilibrium = M.wt. of equilibrium mixture / Initial M.wt.

1 / 1+x = 69 / 92

1+x = 92/69

1+x = 1.33

x = 1.33 - 1

x = 0.33

Total moles at equilibrium = 1 + x = 1 + 0.33 = 1.33

Moles of NO2 at equilibrium = 2x = 2*0.33 = 0.66

=> Percentage abundance of NO2 = moles of NO2 at equilibrium / total moles at equilibrium

= 0.66/1.33 * 100

= 0.4962 * 100

= 49.62%

≈ 50%

Hence,  percentage abundance of NO2 in mixture is approx 50%.

That is so because in 4n number ofelctrons the energy level is always found very high as COMPARE to aromatic and non – aromatic. Therefore, ANTIAROMATIC compounds are LESS STABLE than non aromatic even though they have resonance. ONE year ago.

Hey there!

When Copper sulphate and iron nail are put together then the reactions occurs is: 

FE(s) + CuSO₄ (aq) → FeSO₄(aq) + Cu (s)

As we KNOW the colour copper sulphate solution is blue in colour. When we put iron nail in it , copper forms brown coloured COATING on iron nail. The solution's colour also changes to LIGHT green colour. 

Hence, it is a DISPLACEMENT reaction as iron is more reactive than copper and copper is displaced to form ferrous sulphate solution.

Hope It Helps YoU!

Metals obtained by reduction processes STILL contain some objectionable impurities and hence have to be refined. Refining techniques vary widely from metal to metal and also depend on the USE to which a metal has to be put. Sometimes during refining some substances may have to be ADDED to impart some desirable characteristics to the metal. In some CASES a metal is refined to RECOVER valuable by-products present as impurities. Some of the refining processes used are defined below.

By Poling

Ozone (O3) is a triatomic molecule, consisting of three oxygen atoms. It is an allotrope of oxygen that is much less stable than the diatomic O2. Ground-level ozone is an air pollutant with harmful effects on the respiratory systems of animals.

 

The ozone layer in the upper atmosphere filters potentially damaging ultraviolet light from reaching the Earth's surface. It is present in low concentrations throughout the Earth's atmosphere. It has many INDUSTRIAL and consumer applications.

 

Most people can detect about 0.01 ppm of ozone in air where it has a very specific sharp odor somewhat resembling chlorine BLEACH. Exposure of 0.1 to 1 ppm produces headaches, burning eyes, and irritation to the respiratory passages. Even low concentrations of ozone in air are very destructive to organic materials such as latex, plastics, and lungs.

 

Low range ozone gas detection (ppb-range) is essential in detection of ozone. Airmet recommends the Aeroqual gas DETECTORS given their stability and long life sensors

hope it helps u plz mark as brainlist if u satisfied with the answer

It will still an ACIDIC solution.since the pH of the solution will be less than 7.while DILUTION it will be acidic however acidic character decreases or H+ ions CONCENTRATION decreases. so it will be slightly neutral ALSO.
its pH will be app.6.958

The WAVELENGTH of VISIBLE LIGHT is in between its HALF QUESTION

It is because we are using it faster than it is renewed. Oxygen is a renewable RESOURCE and it is GETTING used up faster than it is renewed DUE to the INCREASE in population and factories and cutting down of trees (deforestation). yes even if a resource is renewable it can still get EXHAUSTED due to over consumption.

★ ELLO ★

here is your ANSWER!!


a driver is able to cut through water in a swimming pool because :-


water is a also matter .


we know that particle of matter have space between them.


in the case of fluids ( the tendency of flow is known as FLUID) the space between particle is large.

so that it become easier for the driver to cut through water in swimming pool.



hence , a driver is able to cut through water in a swimming pool



hope it HELPS you


★ thanks ★

A brief trivia on Carbon tetrachloride :

We know that, the term " tetra " means " four " in numbers.

  CCl₄ ( Carbon tetrachloride ) is a liquid organic compound. It is FORMED chemically with the help of four Carbon ATOMS bonding with ONE Chlorine atom. There are four equivalent bonds C-Cl.

( Refer to the ATTACHMENT please )

Uses of CCl₄ ( Carbon tetrachloride ) :

  • Mostly used in fire extinguishers.

  • It is ALSO used as a cleaner.

  • It is also used as a chemical solvent.

The EAN of iron in potassium ferricyanide is [PB. CET 2000]. A) 18. B) 54. C) 35. D) 23. STUDYADDA. Previous NEXT. Correct Answer: C. SOLUTION : EAN of a central

Condensation: the substance changes from a GAS to a LIQUID. Vaporization: the substance changes from a liquid to a gas. SUBLIMATION: the substance changes DIRECTLY from a SOLID to a gas without going through the liquid phase

I THINK that D is the CORRECT ANSWER

Gmm of sulphur=32gram
1 mole sulphur=6.023*10^23 atoms(in 32 GRAM sulphur)
3.2 gram sulphur WOULD contain= 6.023*10^23 *3.2/32= 6.023*10^22

gmm of calcium=40G
1mole of calcium= (40g)
mass of 6.023*10^22 calcium = 40*6.023*10^22/6.023*10^23= 4 GRAMS

Atomic radius decreases from left to right in a PERIOD because the nuclear CHARGE acting on the ATOM increases. When nuclear charge increases the tendency to pull electrons increases and hence the radius decreases.

Hope it HELPS you.

ANSWER: It is an endothermic reaction.

Explanation:

When barium hydroxide is ADDED to ammonium hydroxide then it results in the formation of barium chloride and ammonium hydroxide.

The chemical reaction equation is as follows.

This reaction is endothermic in nature because when barium hydroxide is added in ammonium chloride then they absorb HEAT.

Because it is more OXIDATION STATE

The metal LOSES electrons, and in forming Mg2+it loses 2 electrons and is oxidized:

Mg(s)→Mg2++2e− (i)

And on the other hand chlorine is reduced to CHLORIDE ion by accepting electrons:

CL2(g)+2e−→2Cl− (ii)

And (i)+(ii)= Mg(s)+Cl2(g)→MgCl2(s)

Both CHARGE and mass are BALANCED, as required.

HEY DEAR.....
YOUR ANSWER⬇
There will only be 1 CARBON ATOM in hydrogen carbonate.
I HOPE YOU FIND IT HELPFUL.

Zinc is a CHEMICAL element with symbol Zn and atomic number 30. It is the FIRST element in group 12 of the periodic table. ... Zinc METAL was not produced on a large scale until the 12th CENTURY in India, though it wasknown to the ancient Romans and GREEKS

What is ur question ???????


To calculate the mass of a single atom, first look up the atomic mass of oxygen from the PERIODIC table.
This number 16, is the mass in grams of one mole of oxygen. One mole of carbon is 6.022 x 10^23 atoms of carbon (Avogadro’s Number). This RELATION is then used to 'convert' a carbon atom to grams by the ratio:

mass of 1 atom / 1 atom = mass of a mole of atoms / 6.022 x 10^23 atoms

Plug in the atomic mass of carbon to SOLVE for the mass of 1 atom:

> mass of 1 atom = mass of a mole of atoms / 6.022 x 10^23

> mass of 1 Oxygen atom = 16 g / 6.022 x 10^23 atoms

> mass of 1 Oxygen atom =2.65 x 10^-23 g.

I THINK,it is your ANSWER

It is 4°C.

Density is inversely proportionate to Volume.

With DECREASING temperature, up to 4 degree CELCIUS, the volume of a particular amount of water shrinks and the speed of molecular movements decreases. So, the density increases gradually.

At 4 degree celcius the density becomes maximum while it is in liquid STATE.

Below 4 degree Celcius, water molecules start occupying crystal structure and while reaching solid state, the distance among one ANOTHER increases than previous. Hence with further decrease in temperature below 4 degree Celcius, the volume slightly increases and the density decreases.

One example is:

In countries FALLING under sub-polar and polar circles, water pipes often crack as water becomes ice in cold temperature. It means ice has more volume than its equivalent amount of water.

As the THIRD row is ALMOST the " middle row" of the PERIODIC table, the word, middle row anomaly COMES into effect. Hope this information will clear your DOUBTS regarding the topic.