Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

4251.

assiied?Stateitstypes.What is meant by dispersed phase and dispersion medium ?

Answer»

Dispersed phase:The phase that is scattered orpresent in the form of colloidal particles is called thedispersed phase.Dispersion medium:The medium in which the colloidal particles are dispersed is called thedispersion medium.Ex: In a starch solution, starch represents the dispersed phase, while water represents thedispersion medium.

code division multiple access

4252.

emulsifier is a substance which :Stabilizes the emulsionHomogenises the emulsion-) Coagulates the emulsion) Accelerates the dispersion of liquid in liquid

Answer»

coagulates the emulsion....is the right

c is the right answer

stabilizes the emulsion (1)

homogenized the emulsion

coagulates the emulsion

Coagulates the emulsion

optionccoagulates the emulsion

option C is the correct answer

option C is the correct answer

c) Coagulates the emulsion is the right answer of the following

a) is the correct answer

option C is the correct answer

4253.

Type of Emulsion: -

Answer»
4254.

%Write dispersed phase and dispersion medium of emulsion.

Answer»

Main Difference – Dispersed Phase vs Dispersion Medium

A dispersion is a system in which particles of one phase are dispersed throughout a medium that is in a different phase. Therefore a dispersion is a two-phased system. It is composed of a dispersion medium and a dispersed phase. Dispersion medium is a continuous medium in which the dispersed phase is distributed throughout. Dispersed phase is the phase that is composed of particles that are distributed through another phase. The main difference between dispersed phase and dispersed medium is thatdispersed phase is a discontinuous phase whereas dispersion medium is a continuous phase.

Dispersed phase is one of the two phases in acolloid. The dispersed phase is a discontinuous phase that is distributed throughout the dispersion medium. The dispersed phase is composed of particles that have diameters around 1-100 nm.

There can be three types of particles in the dispersed phase. According to these particles, the colloids can be categorized into three groups as,

Multi-molecular colloids

Macro-molecular colloids

Associated colloids (mis-cells)Dispersion medium is the continuous phase of a colloid. It is the phase in which the dispersed phase is distributed. It can be in any state of matter: solid, liquid or gas. It is also called the external phase because the dispersed phase is inside the dispersion medium.

Dispersed Phase:Dispersed phase is one of the two phases in a colloid.

Dispersion Medium:Dispersion medium is the continuous phase of a colloid.

the dispersed phase is liquid and dispersion medium is liquid

4255.

Aldehydes and ketones can be distinguished byO (a) 2,4 DNP testO (c) Tollen's reagent15)0 (b) Molisch testO (d) Mulliken's test

Answer»

Option (c) is correct.

The test with Tollen's reagent is also called Silver mirror test.

4256.

5. Which of the following may be regarded as a redox reaction ?C_{2}+2 O H \rightarrow C t+C l O^{-}+H_{2} O

Answer»
4257.

and Mete

Answer»

Thedifferencebetween “metre” and “meter” “Metre” is the British spelling of the unit of length equal to 100 cm, and “meter” is the American spelling of the same unit. However, “meter” is also used in British English, but it means something different. A “meter” in British English is an instrument for measuring.

thanks

and where use both

4258.

why is the amount of fas collected in one of the test tube in activity 1.7 double of the amount collected in other

Answer»

because it is has nitrogen

4259.

How isyon-66 prepared? lite we 1Buha-

Answer»

Nylon 66 is synthesized by polycondensation of hexamethylenediamine and adipic acid. Removing water drives the reaction toward polymerization through the formation of amide bonds from the acid and amine functions. Thus molten nylon 66 is formed.Chemical formula:(C12H22N2O2)n

Due to its versatility, nitrile (NBR, Buna-N) is used in applications involving not only oil and fuel resistance, but those requiring resistance to heat, abrasion, water, and gas permeability. Nitrile rubber's material properties make it an excellent solution for sealing applications.

4260.

Solve using identity3.5X35 203.5)(05) 0 5x0.53.5X35+2(3.5)(05)+ 0 SXOS

Answer»
4261.

Define: Market.

Answer»

The termmarketrefers to the group of consumers or organizations that is interested in the product, has the resources to purchase the product, and is permitted by law and other regulations to acquire the product

4262.

3.What are the two main Components of our Environment?

Answer»
4263.

Define: a. molecule, b. atomicity, c. ion.

Answer»

Molecule:A group of atoms bonded together, representing the smalllest fundamental unit of a chemical compound.It can also take part in a chemical reaction.Atomicity:Atomicity is the number of atoms present in the molecules of an element.Ion:An atom or molecule with a net electric charge due to loss or gain of electrons.

Molecule are bounded in with two are more atomsAtomicity is number of atoms present in a elementCompounds are composed with charged species, the charged species are known as ion

a) A molecule is a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up a molecule is a determinate number. For example, HCl(g)is a molecule made of one hydrogen atom bonded to one chlorine atom. It is made of two atoms and is called a diatomic molecule.

b) Atomicity is the number of atoms of an element present in one molecule of that element. For example, there are 2 atoms of hydrogen present in H2 molecule so it atomicity is 2.

c) an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons, as a cation (positive ion) , which is created by electron loss and is attracted to the cathode in electrolysis, or as an anion (negative ion) , which is created by an electron gain and is attracted to the anode.

4264.

Which Indian Bollywood actress was appointed asInternational Goodwill Ambassador for the United Nationprogramme on HIV/AIDS (UNAIDS)?

Answer»

Mrs. Aishwarya Rai Bachchan appointed as International Goodwill Ambassador for the United Nation programme on HIV/AIDS (UNAIDS).

4265.

2 What are the two components of a solution?

Answer»

A solution is a homogeneous type of mixture of two or more substances. A solution has two parts: a solute and a solvent. The solute is the substance that dissolves, and the solvent is the majority of the solution.

4266.

4.Explain what meteoroids, meteors and meteorites are.

Answer»

Ameteoris the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "Meteor" refers to the flash of light caused by the debris, not the debris itself.

The debris is called ameteoroid. A meteoroid is a piece of interplanetary matter that is smaller than a kilometer and frequently only millimeters in size. Most meteoroids that enter the Earth's atmosphere are so small that they vaporize completely and never reach the planet's surface.

If any part of a meteoroid survives the fall through the atmosphere and lands on Earth, it is called ameteorite. Although the vast majority of meteorites are very small, their size can range from about a fraction of a gram (the size of a pebble) to 100 kilograms (220 lbs) or more (the size of a huge, life-destroying boulder).

4267.

At 0°C, the density of a certain gaseous oxide at 2 bar is same as that of dinitrogen at 5 bar.What is the molecular mass of the oxide?(A) 70 g/mol(B) 35 g/mol(C) 140 g/mol(D) 280 g/mol

Answer»

answer is 70

4268.

A bullet of mass 25 g moving with a velocity of200 m/s is stopped within 5 cm of the target. Theaverage resistance offered by the target is:-15.

Answer»
4269.

Why fire burn with flame?

Answer»

Ans :- Color variation within in aflameis caused by uneven temperature. The heat of theflameitself keeps the fuel at the ignition temperature, so it continues toburnas long as there is fuel and oxygen around it. Theflame heats any surrounding fuel so it releases gases as well.

Okay.But in which ignition temperature it start flaming?Any range of that ignition temperature?

4270.

Why do substances burn with or without a flame?

Answer»

The chemical process in which a substancereacts with oxygen to give off heat is called combustion. ... The substanceswhich vaporize during burninggiveflames. For example combustion of kerosene oil produces flame. On the other hand certain substanceslike coaldonot vaporize and hence doesn't produce aflame.

4271.

what is biogas and how does it burn?

Answer»
4272.

What type of fuels:(a) burn with a flame ?(b) burn without a flame ?

Answer»
4273.

23. What type of fuels:(a) burn with a flame ?(b) burn without a flame ?

Answer»

1) gaseous substance burn with a flame

2) solid substance like wood and coal burn without a flame

the flame we se while burning them is that of the volatile substance present in them

4274.

A mixture of ethane (C2H,) and ethene (C2H4) occupies40 L at 1.00 atm and at 400 K. The mixture reacts completelywith 130 g of O2 to produce CO2 and H O. Assuming idealgas behaviour, calculate the mole fractions of C2H4 andC2H6 in the mixture(1995)

Answer»
4275.

138. The ratio of the radii of two Bohr or-bits of H-atoms is 4: 1, what would betheir nomenclature:1) K & L3) N & L2) L & K4) 2 & 3 both

Answer»

bhai is ka answer hair *****$$$$$$####₩₩₩€€€€£

what

4276.

What is the increase in entropy when 11.2 L of O2are mixed with 11.2 L of H2 at STP?(1) 0.576 J/K(3) 7.56 J/K(2) 5.76 J/K(4) 2.76 J/K

Answer»
4277.

The number of litres of air required to burn 8 litresof C2H2 is approximately-(1) 40(3) 80(2) 60(4) 100

Answer»
4278.

tuy it essenteal to scrab magnes?im seibbon befoveburnn& ssedo teackion0ushatgive auitableerample

Answer»

Redox is a chemical reaction in which the oxidation states of atoms are changed. Any such reaction involves both a reduction process and a complementary oxidation process, two key concepts involved with electron transfer processes

example

4279.

buining in cuL2aonied by emission ofa whlle compound x' accomplight. I the buning ribbon is naus Blaceol -in anatmashhote of nittogen, it condinuus to busn anforms a compaurdca(b) tweite 흇he balanced chanical eguation, when Xis

Answer»
4280.

UT10| 39. The equation for complete combustion of pro-pane CH, isCH, (g) + 50,(g) 3C02(g) + 4H2O(g)What is the maximum mass of carbon dioxidewhen a mixture of 0.50 mol of propane and 3.0mol of oxygen is ignited?a) 22.0 gb) 29.3 gc) 44.0 gd) 66.0 g

Answer»

44.0 g is the answer of the question

the correct option is c 44.0g

22.0 answer no 1 .................

4281.

ohl adse ice7ha/

Answer»

Dry ice isfrozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature ofsublimation-- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid.

4282.

two chemical in the form of solution react forming an insoluble solid that settles down .the settled solid is called

Answer»

precipitate is the name of that settled solid.

4283.

हि कलर को ३. हे ५. % आई पी०ए०्सी3 निम्नलिखित यौगिकों के आई०यू०पी०ए०सी० (1117.6 (0 :न 3. निम्नलिखि! It ) नामपद्धतिद्े ७CH,OH ™|CHy— CH;—CH—CH—CH—CHy CH,C1 CHy

Answer»
4284.

37./0.262g of a substance gave, on combustion,0.36lg of Co, and 0.147g of H,0. What isthe empirical formula of the substance(E - 1996)M) CH,O 2) C,H,O 3) C, H, O, 4) C,H,O,

Answer»

mass of CO2 :0.361gmass of water 0.147g

moles of CO2 = .361 / 44 =0.0082 = moles of carbon in the compound;

moles of water = .147 /18 = 0.0082; there are 2 moles of H in each mole of H2O so moles of H = 0.0163moles

molar ratio of C : H = 0.0082:0.0163

or after dividing by the smallest ,molar ratio of C : H = 1.000:1.99

empirical formula is CH2o

4285.

C H_{3}-C H=C H-C H_{3}

Answer»

but-2-ene

4286.

, यदि (४+४), बहुपद 2 + 2x +57 + 10 का एक गुणनपर हो, तो ।। का मान जाए।fo

Answer»

Given,(x + a) is root of equation 2x^2 + 2ax + 5x + 10

Then,For x = - a equation should be equal to zero

2(-a)^2 + 2a*(-a) + 5*(-a) + 10= 0

2a^2 - 2a^2 - 5a + 10 = 0

5a = 10

a = 10/5 = 2

Therefore,Value of a = 2

4287.

7)What is pseudo first order reaction? Explain with one example?

Answer»

A pseudo first order reaction is a reaction that is truly second order but can be approximated to be first order under special circumstances

Example:Consider the hydrolysis of ethyl acetate, during the hydrolysis, the concentration of ethyl acetate is 0.02 mol/L whereas the amount of water is 20 mol/L as the process of hydrolysis involves a large amount of water. Let us say, the process of hydrolysis attains completion in time t. The reaction can be represented as

CH3COOC2H5 + H2O —–> CH3COOH + C2H5OH

For the above-mentioned reaction, the rate equation can be given as,

Rate = k [CH3COOC2H5] [H2O]

Here we see that the concentration ofwateris very high and thus does not change much during the course of the reaction. Thus the rate of the reaction can be said to be independent of the change in the concentration of H2O. Putting the term for change of concentration of water in the above reaction to be zero we can write the effective rate equation as,

Rate = k [CH3COOC2H5]

Here, the term kt takes into account the value of the constant concentration of water.

where K = K’ [H2O]

We see that the reaction behaves as a first-order reaction. Such reactions are termed as pseudo-first order reactions.

4288.

i)What is Pseudo first order reaction?lld nstantanoous rate o

Answer»

Pseudo first order reactions are the reactions which appear as furst order reaction but actually is of higher order.

4289.

मन. 13000 B प0घ 2-19 2 1 ॥्कू| सु [9० 12] |

Answer»

Ans :- Tin react with nitric acid to produce oxide tin(IV), nitrogen dioxide and water. Nitric acid - concentrated solution. This reaction takes place in a boiling solution.

4290.

Lothar Meyer's Arrangement:

Answer»

Periodic table.Meyeris best known for his part in the periodic classification of the elements. Newlands did in England, if each element is arranged in the order of their atomic weights, they fall into groups of similar chemical and physical properties repeated at periodic intervals.

4291.

5.Let mass of electron is half, mass of proton is twotimes and mass of neutron is three fourth of orignal.The find out new atomic wt. of O16 atom(1) increases by 37.5%(2) Remain constant(3) increases by 12.5%(4) decreases by 25%

Answer»

thanks👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

4292.

Explain the utility of function library.

Answer»

Library functions in C language are inbuilt functions which are grouped together and placed in a common place called library.

We can make use of these library functions to get the pre-defined output instead of writing our own code to get those outputs.

4293.

(b) What are normalized and orthogonal wave functions

Answer»

Anormalized wavefuntion means that the probability that the particle is found in the considered domain is equal to 1 and thus the integral of the square of thewave functionin the domain is equal to 1 (remind that thewave functionis afunctionof complex variable) as previously written by Matùs Dubecký.…

“Orthogonal” means “perpendicular.” For perpendicular vectors, their dot product is zero. (Cosine of 90 degrees is zero.) You can compute the dot product by multiplying together the corresponding vector elements (that is, 1 with 1, 2 with 2, 3 with 3, …) and then adding together all of these products.Functions can be orthogonal too, because functions can be like vectors with an infinite number of elements. However, in this extension, you can no longer sum the products of elements—you must integrate the product of the two functions. (For complex valued functions, it’s a bit more complicated.)

4294.

explain the utility of function library

Answer»

Library functions. TheClanguage is accompanied by a number of standardlibrary functionswhich carry out various useful tasks. In particular, all input and output operations (e.g., writing to the terminal) and all math operations (e.g., evaluation of sines and cosines) are implemented bylibrary functions.

4295.

what are normalised and orthogonal wave functions?

Answer»

A normalized wave funtion means that the probability that the particle is found in the considered domain is equal to 1 and thus the integral of the square of the wave function in the domain is equal to 1

4296.

actorise : 27x3 + ะฃะท + zs_9xyz

Answer»

27x^3+ y^3+ z^3- 9xyz = (3x)^3+ y^3+ z^3- 3 × (3x) × y × z = [3x + y + z ][(3x)^2+ y^2+ z^2- (3x) × y − y × z − z(3x)] [Since (a + b + c )(a^2+ y^2+ z^2- ab−bc−ca)] = [3x + y + z ][9x^2+ y^2+ z^2- 3xy − yz − 3zx]

4297.

4. (a) What does LPG stand for?(b) What does CNG stand for?

Answer»

a)Liquefied petroleum gasorliquid petroleum gas(LPGorLP gas), also referred to as simplypropaneorbutane, areflammablemixtures ofhydrocarbongases used asfuelinheating appliances, cooking equipment, and vehicles.

b)Compressed natural gas(CNG) (methane stored at high pressure) is a fuel which can be used in place ofgasoline,diesel fuelandpropane/LPG. CNG combustion produces fewer undesirable gases than the aforementioned fuels. In comparison to other fuels, natural gas poses less of a threat in the event of aspill, because it is lighter than air and disperses quickly when released.Biomethane– cleaned-upbiogasfromanaerobic digestionorlandfills– can be used.

4298.

ene nt U.25 HOe of hydrogenCalculate the number of moles in 12.044 x 1025 atoms of phosphorus.24 Calculato th

Answer»
4299.

1. Describe how carbon dioxide is used to extinguish fires with the help of fire extinguishers.

Answer»

Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire.

Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly.

4300.

How does water help in extinguishing fires?

Answer»

Water doesnot, in general,help extinguishafire. Typicalfires, however,canbe successfully attacked usingwateralone, as itcancool the fuel at the base of thefireor generate a vapor barrier between atmospheric oxygen and the hot fuel.Water canaccelerate liquid hydrocarbonfiresby dispersing fuel.