52639 + Interview Questions in Secondary School in Chemistry

1.	Why plaster of paris should be stored in moisture proof container? Can anyone explain simply..
Answer» This is because when it COMES in CONTACT with WATER it BECOMES GYPSUM.

Discussion

2.	Why does sulphur dissolve in carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide
Answer» SULPHUR has the PROPERTY to dissolve in CARBON disulphide whereas iron does not dissolve and RETAINS its individual property. However, On heating Iron and Sulphur, they chemically combined forming Iron Sulphide. In this, Iron and Sulphur particles do not exists separately as such they loose their individual property.

Discussion

3.	Rajesh takes 36 minutes to cover a distance of 36 km on a motorcycle calculate his velocity in. Meter per minute
Answer» 36 KM = 36000m TIME = 36 min ➡️ VELOCITY = DISTANCE (displacement) /time. ➡️ Velocity = 36000/36 m/min ➡️ Velocity = 1000m /min

3.

Rajesh takes 36 minutes to cover a distance of 36 km on a motorcycle calculate his velocity in. Meter per minute

Answer»

36 KM = 36000m

TIME = 36 min

➡️ VELOCITY = DISTANCE (displacement) /time.

➡️ Velocity = 36000/36 m/min

➡️ Velocity = 1000m /min

Discussion

4.	What is the role of concentrated h2so4 as a ctalyst in the esterification reaction?
Answer» Esterification is a RELATIVELY SLOW process at room temperature and $does not proceed to completion.$ $Concentrated sulfuric acid is used as a catalyst, and has a dual role: Speeds up the reaction. Acts as a dehydrating agent, forcing the equilibrium to the right and resulting in a greater yield of ester.$ . hope it HELPS you

Discussion

5.	Why chloroethane does not have ability to form hydrogen bond with water?
Answer» HEYA DEAR!! $Hydrogen-Bonding Forces. Compounds that contain hydrogen bonded to oxygen or nitrogen,$ . such as WATER or ammonia, interact by very STRONG INTERMOLECULAR forces. $This interaction is called a hydrogen bond. The hydrogen atom in a polar covalent bond to an electronegative element has a partial positive charge.$ . ☆ $Thank Q hope this answer helped u !! plzz pick my answer as the best if u feel this answer helpful$ ☺

Discussion

6.	Which reaction is used for increasing the number of carbon atoms in chain?
Answer» HEYA MATE!! $According to R. Zbinden, the linear hydrocarbon chain consisting of$ 7-8 $carbon atoms may be considered as long enough because the contribution of the end-groups becomes negligibly small.$ . ☆ $Thank Q hope this answer helped u !! plzz pick my answer as the best if u feel this answer helpful$

Discussion

7.	What is the basicity order of aniline, nitroalinine,methoxy alinine and toluidine?
Answer» Heya dear!! $Methyl group increases the basic strength of aniline generally by stabilizing the ammonium ion.$ But, ortho effect is also INVOLVED which dec the BASICITY of the ortho substituent more than the META ONE. $Hence the order followed\\p methoxy aniline> m methoxy aniline> o methoxy aniline$ . $Thank Q hope this answer helped u !! plzz pick my answer as the best if u feel this answer helpful$

Discussion

8.	Which is more acidic ethanol or ethanoic acid. Explain on the basisi of reaction
Answer» HEYA DEAR!!!!!!!! $it is the stability of conjugate base of ethanoic acid, which make it more acidic than ethanol$ . $\text{[math]}$ ☆☺❤❤♥ $Thank Q hope this answer helped u !! plzz pick my answer as the best if u feel this answer helpful$

Discussion

9.	What is the difference between molecules of soap and sulphur chemivally?
Answer» $Soaps$ 1. Soap are sodium or potassium SALTS of long chain fatty acids. 2. There are cheap. 3. There are not suitable for DELICATE clothes. 4. They are clean better in hot water. 5. They don't produce lather with HARD water and are not able to clean the cloth. 6. LOT of water is NEEDED to remove soap from the cloth. Detergents $1. Detergents are the sodium salt of sulphonic acid.\\2. They are costly.\\3. They are suitable for delicate clothes.\\4. They clean both in hot and cold water.\\5. They clean the cloth even in hard water.\\6. They are removed very easily so less quantity of water is needed.$

Discussion

10.	Treatment of 100 ml of 0.1 m solution of cocl3.6h2o with excess agno3; 1.2 Ă— 1022 ions are precipitated. The complex is
Answer» TREATMENT of 100 ML of 0.1 m solution of cocl3.6h2o with excess AGNO3; 1.2 Ă— 1022 ions are precipitated. The complex is = 1.2 Ă— 1022 100 ml of 0.1 m solution of cocl3.6h2o =0.9

Discussion

11.	What is an ebonite rod? which charge does it acquire when rubbed with woolen cloth
Answer» Besides natural rubber, Ebonite contains about 25–80% sulfur and linseed oil. Its name comes from its intended use as an ARTIFICIAL SUBSTITUTE for ebony wood.The material is known GENERICALLY as hard rubber and has formerly been CALLED vulcanite, although that name now refers to the MINERAL vulcanite. When an ebonite rod is rubbed with woolen cloth the rod gets negatively chargedbecause the friction between the fur and the rod makes the ebonite rod to gain electron from the fur. This is because, electrons in fur are less tightly bound than the electrons in theebonite rod . :-) hope it helps you........ Please mark this answer as brainleist....

Discussion

12.	What is the name of the compound when oh is attached to benzene ring?
Answer» it is CALLED benzenol

Discussion

13.	What happens when dioxygen is passed into ammonia?
Answer» They REACT and form a SOLUTION of ammonium carbonate. Ammonia is a basic solution, carbon DIOXIDE in water behaves like an acid. MARK BRAINLIEST...

Discussion

14.	The total number of electrons in Nitrogen is 7. What is its vacency?
Answer» Atomic NUMBER of NITROGEN is 7.Therefore its ELECTRONIC configuration is 2,5. Thus valency of nitrogen is 3

Discussion

15.	The equilibrium constant k p for this reaction at 298 k, in terms of b equilibrium , is
Answer» Chemical Equilibrium is the STATE in which the reactants and products have no net change over time. This is when the forward and REVERSE reactions occur at equal RATES. This state of equilibrium can be described by the equilibrium CONSTANT, K.

Discussion

16.	Calcium oxide is mixed with water
Answer» ♥ Hey MATE ♥ If REACTION OCCURS :- CaO + H2O ➡ CaOH Will be formed. ♥Hope it helps♥

Discussion

17.	Hybridization of carbon. CH3CH = CHC tripalbond CH
Answer» HYBRIDISATION of the above EQUATION is SP3D2

Discussion

18.	Heating of a ore below its melt-ing point in the absence of air is known as
Answer» Hey FRND..... here is your answer...... The process of heating of a ore below its melting point in the absence of air is known as CALCINATION...... HOPE this will help you..... plzzz mark it as brainliest

Discussion

19.	When you burn a candle both physical and chemical change occurs what are these changes
Answer» CHEMICAL CHANGES in Burning Candle: When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the HEAT produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon DIOXIDE, Carbon soot,water vapours, heat and light.

Discussion

20.	Mebtion the nature of toithpaste .How dies it help to prevent tooth decay
Answer» The nature of TOOTHPASTE is BASIC in nature thus it helps in neutrilisation of excess ACID and prevents TOOTH decay

Discussion

21.	Give the chemical equation for the formation of scum when hard water is treated with soap. Give me full satisfied answer plzzzz
Answer» hee mate here's your answer ✒we KNOW that hard water contain magnesium and calcium SALT ✒so let TAKE one of magnesium salt that is magnesium CARBONATE that is mgcl2 ✒and formula of soap is c15H31cooNa +mgcl2= Nacl+mg(C15H31coo)2 (soap) (hard water)(salt) (scum) hope this will help you and please mark me as brainlist --------'xxxxxxxxxx----------- xxxxxxxxxx-------------

Discussion

22.	Write first five members of the homologous series of alkenes and alkynes?
Answer» Homologous series is a series of compounds with similar chemical properties and same functional group differing with the successive MEMBER by CH2. Carbon chains of varying length have been observed in organic compounds having the same general formula. Such organic compounds that vary from one another by a repeating unit and have same general formula form a series of compounds. Alkanes with general formula CnH2n+2, alkenes with general formula CnH2n and alkynes with general formula CnH2n-2form the most basic homologous series in organic chemistry. Examples of Homologous series The successive members vary from each other by a CH2 unit. For example in CH4 and C2H6, the difference is -CH2 unit and the difference between C2H6 and C3H8 is also -CH2 unit. So CH4, C2H6, and C3H8 are homologs. The same thing can be observed in case of alkenes in which the FIRST member is ethene and the successive members are C3H6, C4H8, and C5H10. They DIFFER from each other by a –CH2 unit. All the members belonging to this series have the same functional groups. They have similar physical properties that follow a fixed gradation with increasing mass. The properties of CH3OH, C2H5OH, and C3H7OH are similar and follow a gradual change with increasing molecular mass of the successive members of the series. This is because, with the increase in the molecular mass of the compounds, the number of bonds also increases. Therefore, properties such as melting and boiling point, solubility, etc. that depend on the mass and the total number of bonds in a compound show a gradual change with an increase in molecular masses of the compounds. Chemical properties of the members of a homologous series are the same due to the fact that they all have the same functional groups in them. This series has enabled the scientists and engineers to study different organic compounds in a SYSTEMATIC manner. They can predict the properties of organic compounds belonging to a particular homologous series based on the data available from the other members of the same series. The study of organic compounds has been simplified.

Discussion

23.	The second ionization energy of Cu and the second ionisation energy Cr are sufficiently high
Answer» Cu stands for Copper. Cr stands for Chromium. The Electronic CONFIGURATION of Cu is 3D10 4s1 The Electronic configuration of Cr is 3d5 4s1 The second ionization energies of Cu and Cr are sufficiently high. These are much HIGHER than the first ionization energies of Cu and Cr. The reason for such high ionization energy is that the 1st electron from their outermost shell has already been removed. Now both of them have ATTAINED a stable noble GAS state. The noble gas state means an inert state. In such a state, an element does not take part in a reaction. A lot of energy is required to initialize any reaction in such state. So it will require a lot of energy to remove another electron from their Outermost or Valence shell.

23.

The second ionization energy of Cu and the second ionisation energy Cr are sufficiently high

Answer»

Cu stands for Copper.

Cr stands for Chromium.

The Electronic CONFIGURATION of Cu is 3D10 4s1

The Electronic configuration of Cr is 3d5 4s1

The second ionization energies of Cu and Cr are sufficiently high.

These are much HIGHER than the first ionization energies of Cu and Cr.

The reason for such high ionization energy is that the 1st electron from their outermost shell has already been removed. Now both of them have ATTAINED a stable noble GAS state. The noble gas state means an inert state. In such a state, an element does not take part in a reaction. A lot of energy is required to initialize any reaction in such state.

So it will require a lot of energy to remove another electron from their Outermost or Valence shell.

Discussion

24.	Al+H2O =Al2O3 +H2 balance the chemical equation
Answer» 2Al+3H2O= Al2O3+3H2 is BALANCED

Discussion

25.	Explain why 3/2He and 3/1H are not considered isotopes
Answer» The COMPOUNDS which you have specified does not exist in nature MAYBE you have wrongly typed the QUESTION PLEASE be precise and accurate

Discussion

26.	The isotope atoms differ in a. Atomic number b. Number of protons c. Number of electrons d. Atomic weight
Answer» The CORRECT answer is d) Atomic weight Reason: In different ISOTOPES of an ATOM, the no. of neutrons in the nucleus of the atom are different. Hence, their weight is different (as the MASS of an atom is the sum of the no. of protons and neutrons) Hope it helps^_^

26.

The isotope atoms differ in a. Atomic number b. Number of protons c. Number of electrons d. Atomic weight

Answer»

The CORRECT answer is d) Atomic weight

Reason: In different ISOTOPES of an ATOM, the no. of neutrons in the nucleus of the atom are different. Hence, their weight is different (as the MASS of an atom is the sum of the no. of protons and neutrons)

Hope it helps^_^

Discussion

27.	Please answer this questions. Don't give spam!
Answer» 1. Fog will FORM 2. It is a IMPORTANT gas for plant to perform photosynthesis 3.as at night TREE RELEASE carbondioxide

Discussion

28.	The compound X(C5H8) reacts with ammonical AgNO3 to give a white precipitate and on oxidation with hot alkaline KMnO4 gives the acid (CH3)2CHCOOH. Therefore X is
Answer» HOPE it HELPS you.......

Discussion

29.	A non metal which allows an electric current to pass through it ,(graphite,sulphur,iodine)
Answer» $hey$ your ANSWER is GRAPHITE ..

Discussion

30.	If the radius of carbon atom is 0.063 ..Nm what does the symbol nm represent
Answer» Nanometre=Nm 1 Nm=10^-9 m ......

Discussion

31.	What is two chemical substance of stop growth ????? !!!!!!??????:
Answer» Write CLEARLY ANSWER pleaz GERMS CONTROLLING gerowth is antibiotic penciliam and plant growth abscisic acid

Discussion

32.	Constituents of terrywool?
Answer» The CONSTITUENTS of TERRYWOOL are 1. TERYLENE and 2. WOOL

Discussion

33.	What will you obseve when hydrogen is burnt in air?
Answer» Here Is Your Answer My FRIEND...✌️✌️ When HYDROGEN will burnt in air then we will OBSERVE a pop like sound. ✨Hope It Helps You...♥️♥️ ⏩If Yes Then MARK Me As Brainliest Please..✌️♥️♥️

Discussion

34.	Why does inert gases placed in zero group
Answer» Inert GASES are the Noble Gases . They have fully FILLED outermost SHELL .Inert gases neither share the ELECTRONS nor take . Name of all inert gases are - helium (He), neon (Ne), argon (AR), krypton (Kr), xenon (Xe), and radon (Rn). Therefore these inert gases can't take part in any chemical reaction $\bold{And \:are \:placed \:in \:zero \:grup}$ Hope It Helps

Discussion

35.	Assume that you are a driver what measures do you take to save petrol and diesel
Answer» Hey frnd.... 1) first I can use those routes which can be a little once by which I have to go. 2) I'll not use the vehicle for shorter distance I can WALK there. 3) I'll not turn the vehicle on for long time when not in use. HOPE THIS HELP YOU ☺☺❤❤❤

Discussion

36.	Define substitution reaction.
Answer» The reaction in which one (or more )hydrogen atoms of a hydrocarbon are REPLACED bysome other atoms (CHLORINE)is called a substitution reaction.saturatedhydrocarbons HOWEVER UNDERGO substitution reaction with chlorine in the presence of sunlight

Discussion

37.	Why can't alcohol react with sodium carbonate?
Answer» I can give a reaction by which you can understand every acid base reaction goes to formation of higher acid to lower acid and higher base to lower base because lower acid and base are more stable Now in simple reaction C2H5Oh+NAOH ——→>>>C2H5ONa+H2O Now in this reaction if reaction happen sodium ALKOXIDE and WATER form but we know that water is more acidic than ALCOHOL and sodium alkoxide more basic than NaOh so this reaction can not be happen so alcohol not react with NaOh Mark me as the brainliest if it HELPED you

37.

Why can't alcohol react with sodium carbonate?

Answer»

I can give a reaction by which you can understand every acid base reaction goes to formation of higher acid to lower acid and higher base to lower base because lower acid and base are more stable

Now in simple reaction

C2H5Oh+NAOH ——→>>>C2H5ONa+H2O

Now in this reaction if reaction happen sodium ALKOXIDE and WATER form but we know that water is more acidic than ALCOHOL and sodium alkoxide more basic than NaOh so this reaction can not be happen so alcohol not react with NaOh

Mark me as the brainliest if it HELPED you

Discussion

38.	Orbital structure of But-2-ene
Answer» Above is your ANSWER

Discussion

39.	Defination and example of chemical change and physical change
Answer» In chemical change one substance REACTS with other substance to undergo a change and a NEW substance is obtained. EX: BURNING of paper The changes which OCCURS without any chance in composition or chemical nature of the substance is called PHYSICAL change. Ex: melting of ice

Discussion

40.	Difference between atom and molecules plzzzzzzzzzzzz
Answer» MOLECULE is GROUP of ATOM Atom is a TINY PARTICLES

Discussion

41.	What is polymorphic form of sulfur
Answer» The most common POLYMORPHIC form of sulfur is the orthorhombic polymorph of S8. The component sulfur subsists as many allotropes. REGARDING a large number of allotropes, sulfur is second only to carbon. In addition to the allotropes, any allotrope often subsists in polymorphs, DESCRIBED by Greek PREFIXES (α, β, ETC.).

Discussion

42.	for the system A(g) +2b(g) = c(g) the equilibrium concentration are. (A) 0.06mole/litre (B) 0.12mole/litre (C) 0.216 mole/litre. The k (eq) for the reaction is
Answer» K(EQ) =(C)/((a)(b^2)) =0.216/0.060.12^2 =0.216/0.060.0144 =0.216/0.000864 =21610^-3/864*10^-6 =250 it is OPTION (a)

Discussion

43.	Electron affinity is maximum in: alkali metals , alkaline earth metals, halogens, inert gases.
Answer» HEY there!!☺️ . . ANS:-. HALOGENS

Discussion

44.	What is catalytic hydrogenation?
Answer» Asura powdered electronic SYSTEM GENERATED hydrogen has it is a cathode and oxygen has a at its on that they have developed a CATALYST that help to the electron is switch the recording braking efficiency generating Lee oxygen and hydrogen that could be EVEN fully filled filled cells

Discussion

45.	What is the difference between slaked lime and lime water
Answer» Slaked LIME is CHEMICALLY calcium hydroxide, and its chemical formula is Ca(OH)2. It is a white coloured SOLID which is obtained when water is added to calcium oxide (CaO). Lime water on the other hand is a SATURATED solution of slaked lime in water.

Discussion

46.	Name a hydrocarbon which increases the rate of fruit ripening
Answer» ETHYLENE HELPS in RIPENING of FRUITS.

Discussion

47.	Write the characteristics of solids any five
Answer» Five CHARACTERISTICS of solid(s) are :- a). SOLIDS usually have HIGH density. b). the intermolecular force/cohesive force among it's particle is very strong. c). there is very LESS intermolecular space between it's particle; hence they are TIGHTLY packed. d). they are rigid e). they are not compressible.

Discussion

48.	A sample of Vitamin C is known to contain 2.58×10^24 oxygen atoms. How many moles of O2 are present in the sample.Give the answer with appropriate steps.
Answer» Hey there is answer !! I hope you HELP !! MARK me BRAINLIST !!! =========================== 6.023 x 1023 ATOMS of oxygen = 1 mole oxygen atom therefore 2.58 x 1024 atoms of oxygen = 2.58 x 1024 /6.023 x 1023 = 25.8 x 1023/ 6.023 x 1023 = 4.28 moles of oxygen atom

Discussion

49.	What is two types of reducing agent used to reduce metal oxide?
Answer» PLEASE READ FULL ANSWER Whenever there is a metal which is oxidising(or rusted or corrosing), it is always affected by air and water. To reduce their OXIDE or to prevent oxiding, these are two different case. CASE 1: Before oxidising- Oil paints and Galvalisation (a process in which a layer of zinc and other non- corrosive metal's layer is PLAYED on SURFACE to AVOID further corrosion). CASE 2: After oxidising- Carbon is one of the best reducing agent to prevent it. Or same materials can also be applied. ****THANK YOU********

Discussion

50.	the atomic number of fluorine is 9 and its atomic masses 19 what is the number of neutrons present in the nucleus
Answer» Atomic NUMBER of FLUORINE = 9 Atomic mass of Fluorine = 19 We know that the number of neutrons in atomic mass is the remaining particles LEFT after excluding the protons in it. Hence, Number of neutrons in an atom of Fluorine = Atomic Mass - Atomic Number Number of neutrons in an atom of Fluorine = 19 - 9 = 10

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why plaster of paris should be stored in moisture proof container? Can anyone explain simply..

Why does sulphur dissolve in carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide

Rajesh takes 36 minutes to cover a distance of 36 km on a motorcycle calculate his velocity in. Meter per minute

What is the role of concentrated h2so4 as a ctalyst in the esterification reaction?

Why chloroethane does not have ability to form hydrogen bond with water?

Which reaction is used for increasing the number of carbon atoms in chain?

What is the basicity order of aniline, nitroalinine,methoxy alinine and toluidine?

Which is more acidic ethanol or ethanoic acid. Explain on the basisi of reaction

What is the difference between molecules of soap and sulphur chemivally?

Treatment of 100 ml of 0.1 m solution of cocl3.6h2o with excess agno3; 1.2 Ă— 1022 ions are precipitated. The complex is

What is an ebonite rod? which charge does it acquire when rubbed with woolen cloth

What is the name of the compound when oh is attached to benzene ring?

What happens when dioxygen is passed into ammonia?

The total number of electrons in Nitrogen is 7. What is its vacency?

The equilibrium constant k p for this reaction at 298 k, in terms of b equilibrium , is

Calcium oxide is mixed with water

Hybridization of carbon. CH3CH = CHC tripalbond CH

Heating of a ore below its melt-ing point in the absence of air is known as

When you burn a candle both physical and chemical change occurs what are these changes

Mebtion the nature of toithpaste .How dies it help to prevent tooth decay

Give the chemical equation for the formation of scum when hard water is treated with soap. Give me full satisfied answer plzzzz

Write first five members of the homologous series of alkenes and alkynes?

The second ionization energy of Cu and the second ionisation energy Cr are sufficiently high

Al+H2O =Al2O3 +H2 balance the chemical equation

Explain why 3/2He and 3/1H are not considered isotopes

The isotope atoms differ in a. Atomic number b. Number of protons c. Number of electrons d. Atomic weight

Please answer this questions. Don't give spam!

The compound X(C5H8) reacts with ammonical AgNO3 to give a white precipitate and on oxidation with hot alkaline KMnO4 gives the acid (CH3)2CHCOOH. Therefore X is

A non metal which allows an electric current to pass through it ,(graphite,sulphur,iodine)

If the radius of carbon atom is 0.063 ..Nm what does the symbol nm represent

What is two chemical substance of stop growth ????? !!!!!!??????:

Constituents of terrywool?

What will you obseve when hydrogen is burnt in air?

Why does inert gases placed in zero group

Assume that you are a driver what measures do you take to save petrol and diesel

Define substitution reaction.

Why can't alcohol react with sodium carbonate?

Orbital structure of But-2-ene

Defination and example of chemical change and physical change

Difference between atom and molecules plzzzzzzzzzzzz

What is polymorphic form of sulfur

for the system A(g) +2b(g) = c(g) the equilibrium concentration are. (A) 0.06mole/litre (B) 0.12mole/litre (C) 0.216 mole/litre. The k (eq) for the reaction is

Electron affinity is maximum in: alkali metals , alkaline earth metals, halogens, inert gases.

What is catalytic hydrogenation?

What is the difference between slaked lime and lime water

Name a hydrocarbon which increases the rate of fruit ripening

Write the characteristics of solids any five

A sample of Vitamin C is known to contain 2.58×10^24 oxygen atoms. How many moles of O2 are present in the sample.Give the answer with appropriate steps.

What is two types of reducing agent used to reduce metal oxide?

the atomic number of fluorine is 9 and its atomic masses 19 what is the number of neutrons present in the nucleus