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Phenolcan be usedas anantisepticas well as adisinfectant. 0.2 percent solution of phenol is used as anantiseptic, while 1 per cent of its solution is used as adisinfectant.

In the forest, mist contains tiny droplets of water which act as particles of colloid dispersed in air. When the sunlight enters the dense forest, the rays of light pass through these particles of colloids and get scattered. Due to the scattering of light, the path of the sun ray is clearly visible. This is called the 'Tyndall effect'.

option 3. is correct answer.

In low concentration phenol work as aB. disinfectant

X - baking soda (NaHCo3)Y - carbon dioxide (Co2)Z - sodium carbonate (Na2Co3)Hope it helps!!!!

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antacid

Time pd is directly proportional ton^3/z^2so, (T1/T2) = 27/2

option (2) 27/2 is the right answer.

correct answer is option 2

Abundance of an isotope can be calculated as follows :

Let abundance of isotope with atomic mass Z+2 is xThen abundance of isotope Z-1 is 1-x

(Z+2) x + (Z-1)(1-x) = ZSolving we getx=1/3Therefore abundance of Z+2 is = (1/3)*100=33.33 %And abundance of Z-1 is = 1-33.33 =67.66 %

Therefor isotope with atomic mass Z-1 is higher in % abundance.

66.66%

when l=3 no of electrons will be 3*2=6 electrons.

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specific conductivity is ohm^-1cm^-1

Heating Effect of Electric Current

When an electric current is passed through a conductor, the conductor becomes hot after some time and produces heat. This happens due to the conversion of some amount of electric energy, passing through the conductor, into heat energy. This effect of electric current is calledheating effect of electric current.

The heating effect of electric current depends on three factors:

The resistance,Rof the conductor. A higher resistance produces more heat

The time,tfor which current flows. The longer the time the larger the amount of heat produced

The amount of current,I. the higher the current the larger the amount of heat generated

Heating effect of electric current I, through a conductor of resistance, R for a time, t is given byH = I2Rt. This equation is called theJoule’s equation of electrical heating. It quantifies the heating effect of electric current.

Derivation: Joule’s Equation of Electric Heating

To calculate the heat produced in a conductor, consider current I is flowing through a conductor AB of resistance R for time t. also consider that the potential difference applied across its two ends is V.

Now, total amount of work done in moving a charge q from point A to B is given by:

W = q X V--------(1)

Now, we know thatcharge = current × time

or q = I X t

and V = I X R(Ohm’s law)

Putting the values of q and V in equation (1), we get

W = (I X t) X (I X R)

Or W = I2Rt

Now, assuming that all the work done is converted into heat energy we can replace symbol of‘work done’with that of‘heat produced’. So,

H = I2RT

6 volt is right hereas resistance equivalent = 6*3/9= 2now2+1= 3 ohmso current across voltage= 2*3= 6 V

Ans :- Option (d) fluorine is correct.

There are a total of 18 groups on the periodic table. The halogens are all elements that are found in group 17 of the periodic table. The halogens includefluorine,chlorine,bromine, iodine, and astatine. All of these elements are considered to be reactive nonmetals.

Good source of energy has following characteristics:1) It is readily available2) It is less expensive3) It burns easily in air at a moderate rate4) It produces a large amount of heat

Ans :- The selection of a good source of energy depends on the following factors:1. It should be pollution free2. It should be economical3.It should be easily accessible4. It should not be difficult to transport energy from there5. It should not produce radioactive waste6. It should have a high calorific value.

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The reaction of a metal ion with EDT A is always in the ratio I: I. The stability constants of selected metal-EDTA complexes are given.

Concepts :- angular nodes = l radial nodes = n - l - 1 where n is principle quantum number l is azimuthal quantum number.

in case of 3d , n = 3 and l = 2 so, angular nodes = 2 radial nodes = 3 - 2 - 1 = 0

in case of 4f , n = 4 and l = 3 so, angular nodes = 3 radial nodes = n - l - 1 = 4 - 3 - 1 = 0

option 4 will not show chelation.

as it will not form any ring to get connect from two sided

Valency determines the groupValency is the number of electrons in the outermost shell

A - Valency 2 => Group 2B - Valency 6 => Group 6C - Valency 5 => Group 5D - Valency 1 => Group 1

is it correct

First take electronic configuration => 2, 8, 2Find valence electrons => 2Therefore, group is 2

Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calciumbicarbonate andmagnesiumbicarbonate). When dissolved, these minerals yieldcalciumandmagnesiumcations (Ca2+, Mg2+) andcarbonateand bicarbonate anions (CO32−, HCO3−).

Hardnessofmetalsis usually done using an indenter, with a "hardnessnumber" being related tothedepth of theindentation.

Ceramics and other very hardmaterialsare often measured using a scratch method.

Plastics and other softmaterials'hardnesscan be measured using rebound and other methods.

Aswaterflows through a bed ofion exchangematerial, undesirableionsareremovedand replaced with less objectionable ones. For example, in softening processes, calcium and magnesiumions(hardness) are exchanged for sodiumions.

Hardness is defined as the soap consuming capacity of a water sample. Generally, soaps consist of the sodium salts of long fatty acids (such as oleic acid, palmic acid and stearic acid). The soap consuming capacity of a water largely due to the presence of Ca+2and Mg+2ions as they form insoluble scums of calcium and magnesium soaps which do not have any detergent value.

For softening of water by zeolite process, hard water is percolated at a specified rate through a bed of zeolite. Zeolite holds sodium ion loosely and can be represented as Na2Z, where Z represents insoluble radical frame work.

When the water passes through the zeolite the hardness causing ions (Ca+2, Mg+2etc.) are retained by the zeolite as CaZ and MgZ respectively, while the outgoing water contains equivalent amount of sodium salts. The block diagram and chemical reactions taking place in zeolite softener are:

After some time, when the zeolite is completely changed into calcium and magnesium zeolites, then it gets exhausted (saturated with Ca+2and Mg+2ions) and it ceases to soften water. It can be regenerated and reused by treating it with a 10% brine (sodium chloride) solution.

CaZ + 2NaCl® Na2Z+ CaCl2

MgZ + 2NaCl® Na2Z+ MgCl2

2C17H35COONa + CaCl2 → (C17H35COO)2 Ca (scum) + 2NaCl.

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A mixture of two miscible liquids having a difference in their boiling points more than 25 °C can be separated by the method of distillation. Thus, kerosene and petrol can be separated by distillation. In this method, the mixture of kerosene and petrol is taken in a distillation flask with a thermometer fitted in it. We also need a beaker, a water condenser, and a Bunsen burner. The apparatus is arranged as shown in the above figure. Then, the mixture is heated slowly. The thermometer should be watched simultaneously. Kerosene will vaporize and condense in the water condenser. The condensed kerosene is collected from the condenser outlet, whereas petrol is left behind in the distillation flask.

Refraction of light is the phenomenon by which a single monochromatic source of light emits a ray which is deviated by another medium when it passes through it. This is easily seen when we look through the side of a glass at a pencil on the other side.

To do an experiment to observe refraction, we use a laser and soap solution. We place the beaker containing soap solution on a stand with a white background behind it. We then shine the laser light directly at the soap solution, and observe it from the side against the white background.

We will be able to observe the refraction of light when we look at the given set up. However, precaution must be taken that one does not directly look into the laser as it will damage the eye and its sensory nerve cells.

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A.1-bromo ethaneb.formaldehydec.1-hexened.4-hexenee.prop-1-alf.1-pentnal

स्ट्रेप्टोमाइसिन एक एंटीबायोटिक है जिसका उपयोग कई जीवाणु संक्रमणों के इलाज के लिए किया जाता है। इसमें तपेदिक, माइकोबैक्टीरियम एवियम कॉम्प्लेक्स, एंडोकार्डिटिस, ब्रूसेलोसिस, बुर्कोप्रेनिया संक्रमण, प्लेग, ट्यूलर शामिल हैं

T(K)=T(°C)+ 273.15 = 20 + 273.15 = 293.15K

Kp=p[SO3]²/p[SO2]² p[O2] Since, amount of SO3 and SO2 is same at equilibrium.Therefore partial pressure is also same .So, p[SO3] and p[SO2] will be cancelled out through division.Hence,Kp=1/p[O2]4=1/p[O2]p[O2]=1/4 =0.25 atm

1) Collision Frequency is the average rate in which two reactants collide for a given system and is used to express the average number of collisions per unit of time in a defined system.

2) The initial rate of a reaction is the instantaneous rate at the start of the reaction (when t = 0). The initial rate is equal to the negative of the slope of the curve of reactant concentration versus time at t = 0.

c°=273-F°c°=273-200=-73°c

First the reduction potential of Aluminum will be -ve then it's Standard value without considering problem values is 1.66 hence u know the value now.option(4) is the correct answer

CuSO4 +Zn → ZnSo4 +Cu

ZnSo4 + Cu → no reaction.... ( copper cannot replace zinc from its sulphate

option B is correct.. it is single displacement reaction.

Zn displaces H from its acid.

your question is imcomplete.

from what i understood, you are asking about the reaction of ammonium chloride.

here , it is.