52639 + Interview Questions in Secondary School in Chemistry

1.	How did Mendeleev knew the Sanskrit word 'eka'(one) ?
Answer» I think eka WORD is also used from ancient period all over the world...as U can SEE that in probability or cards also eka (ace) is there...its my personal VIEWS.

Discussion

2.	How will u prepare chloroform gas in the laboratory????
Answer» 1.. Buy acetone and a gallon of 6% sodium hypochlorite bleach. Make sure to get bleach without other additives. In a well ventilated space, measure out sixty grams of acetone. POUR the bleach in to either a large glass container (so that you can see the reagents), or, if that is not available, an HDPE bucket. 2.. Chloroform can be prepared in laboratory by reaction of bleaching POWDER with ethanol or acetone . In this reaction, bleaching powder acts as oxidising chlorinating and HYDROLYZING AGENT. CHLORINE gas evolved from bleaching powder paste oxides and chlorinates ethanol. Moreover, it chlorinates acetone as well .

Discussion

3.	Write in brief about the basic details and the role of sewage system
Answer» It is removed the IMPURITIES from water... and SUPPLIED PURE water in HOUSE....,.

Discussion

4.	Write the chemical equation for the decarboxylation of ethanoic acod.
Answer» Heyaa☺ ______________________ Decarboxylation of ETHANOIC acid is DONE with the help of carbonates and bicarbonates,this react and form salt and water. ➡The EQUATION NaCO2 ----------------------->2CH3COONa+H2O. ______________________ Hope you understand✌ #Bebrainly together we GO far.

Discussion

5.	Hybridization of water
Answer» ELECTRON repulsion favors a tetrahedral SHAPE, so the orbitals are 109.5° apart from each other. of a hydrogen atom on methane. They may also contain lone pairs—this explains the geometry of water, which is sp3 HYBRIDIZED due to the lone PAIR, which occupies one of the FOUR hybrid orbitals.

Discussion

6.	What is meant by 1 mole of atom
Answer» Hey here's your answer -: It is actually a unit of measurement to calculate the AMOUNT of particles in chemistry. One mole of atom is exactly 12 grams of pure carbon-12 powder. The NUMBER of atoms of carbon-12 present in this one mole SAMPLE is 6.022 x 1023. This number is known as Avogadro’s number. Now, don't get confused, • Each mole is equal to the mass of particular mass by given mass. •Each note is also used to find particles in particular formula. Given particles by Avagadro number. Please CONSIDER as BRAINLIEST if you like. Thanks.

Discussion

7.	Please answer all three questions???? I mark you as brainlist!!
Answer» I FOUND ONE answer hope it LIKE

Discussion

8.	Briefly describe how the personal dosimeter works
Answer» ANSWER: hdwbcjhwdvcyrwgxiy2evxohqs ojqsnpknqwpxom1ejc qejco2rygcyrwbojdqnlqnjsnxjq sockqsnxjdqncudgybrycbwrihbeqjcbqshpduburwbljqdncqskndjwh d uwgcyrgyrb c iybcfhbcouqnsjlsq xksqn jwdb kwdhb oqsnpkndq ubdqoycbqsjn qkamxpksqnuwhcou2bcou2rncjqscnqpksxiqhcouwdhcowduhcqsoqwxpu1encoue2bcuewbchdw. JD. lje len Explanation: udwb khwbchwdbjqsm XX q

8.

Briefly describe how the personal dosimeter works

Answer»

ANSWER:

hdwbcjhwdvcyrwgxiy2evxohqs ojqsnpknqwpxom1ejc qejco2rygcyrwbojdqnlqnjsnxjq sockqsnxjdqncudgybrycbwrihbeqjcbqshpduburwbljqdncqskndjwh d uwgcyrgyrb c iybcfhbcouqnsjlsq xksqn jwdb kwdhb oqsnpkndq ubdqoycbqsjn

qkamxpksqnuwhcou2bcou2rncjqscnqpksxiqhcouwdhcowduhcqsoqwxpu1encoue2bcuewbchdw. JD. lje len

Explanation:

udwb khwbchwdbjqsm XX q

Discussion

9.	What is The Molecular Formula Of Ethane
Answer» ✨hey ,dude here is UR answer✨ ⤵⤵⤵⤵⤵⤵⤵⤵⤵ its C2H6 ✨ HOPE IT HELPS U ✨ #RAJPUTANA ❤❤❤❤❤❤❤

Discussion

10.	What Is The Molecular Formula Of Methane
Answer» $\large{\mathfrak{Answer -}}$ $\textbf{\underline{Molecular Formula of Methane is CH4.}}$

Discussion

11.	No SpamsSpams will be reported What is the formula to calculate no of ionsCorrect answer will be mark as brainliest
Answer» This is UR ANSWER my FRIEND...PLZ mark me BRAINLIEST

Discussion

12.	Write the name and structural formula of all the possible isomers of hexane
Answer» STRUCTURAL FORMULA is C6H12

Discussion

13.	Write an example of compound formed with cl(group 17 in period table)
Answer» HCL is the COMPOND who FORMED by CL

Discussion

14.	8 gm 's' ae burnt to form SO2 WHICH IS oxidised by chlorine water.thesolution is treated with BaCl2 sol.the amount of BaSO4 precipitate is a)1 mole b)0.25 mole c)0.5 mole d)0.125 mole
Answer» O.25mole OPTION B) I THINK

Discussion

15.	Why molecules with lone pairs opposite to each other didn't exists?
Answer» Bent SHAPE. There are two situations in which a molecule's shape is "bent" or "angular." Both involve molecules with lone pairs on the central ATOM. When there are three groups of electrons AROUND the central atom, but only two ATOMS, these atoms are said to be in an angular or bent ARRANGEMENT.

Discussion

16.	The pressure of h2 required to make the potential of h2 electrode 0 in pure Water at 298k
Answer» The pressure of H2 REQUIRED to make the potential of H2 electrode 0 in pure water at 298K is 10-¹⁴ atm Hydrogen ions get two ions and form hydrogen GAS as below reaction. 2H+(AQ) + 2e- ⇔H2(g) according to Nernst's equation, E- E0 = - 0.0591/n log[P_(H2)]/[[H+]²] as electrode potential is zero in pure water. i.e., Enet = 0 when [H+] = 10^-7 [ we know, in pure water [H+] = [OH-] = 10^-7], n = 2 so, 0 = 0.0591/2 log[P/(10^-7)²] ⇒Log[P/(10-¹⁴) ] = 0 ⇒P /10-¹⁴ = 1 ⇒P = 10-¹⁴ atm ALSO read similar questions: what is the mass of oxygen required to react completely with 15 g of H2 gas to form water brainly.in/question/5574154 what will be the partial pressure of h2 in a flask containing 2 g of h2, 14g of n2 and 16g of o2 brainly.in/question/5027386

16.

The pressure of h2 required to make the potential of h2 electrode 0 in pure Water at 298k

Answer»

The pressure of H2 REQUIRED to make the potential of H2 electrode 0 in pure water at 298K is 10-¹⁴ atm

Hydrogen ions get two ions and form hydrogen GAS as below reaction.

2H+(AQ) + 2e- ⇔H2(g)

according to Nernst's equation,

E- E0 = - 0.0591/n log[P_(H2)]/[[H+]²]

as electrode potential is zero in pure water. i.e., Enet = 0 when [H+] = 10^-7 [ we know, in pure water [H+] = [OH-] = 10^-7], n = 2

so, 0 = 0.0591/2 log[P/(10^-7)²]

⇒Log[P/(10-¹⁴) ] = 0

⇒P /10-¹⁴ = 1

⇒P = 10-¹⁴ atm

ALSO read similar questions: what is the mass of oxygen required to react completely with 15 g of H2 gas to form water

brainly.in/question/5574154

what will be the partial pressure of h2 in a flask containing 2 g of h2, 14g of n2 and 16g of o2

brainly.in/question/5027386

Discussion

17.	Why gaseous state sodium ion is less stabe than gaseous state sodium atom?
Answer» ANSWER: sodium ion has its outermost shell COMPLETE...so it is stable............but sodium atom is LESS stable since it doesn't have its outermost shell complete..... mark as BRAINIEST

17.

Why gaseous state sodium ion is less stabe than gaseous state sodium atom?

Answer»

ANSWER:

sodium ion has its outermost shell COMPLETE...so it is stable............but sodium atom is LESS stable since it doesn't have its outermost shell complete..... mark as BRAINIEST

Discussion

18.	Why are intramolecular forces stronger than intermolecular forces?
Answer» $Ello ❤$ There are TWO KINDS of forces, or ATTRACTIONS, that OPERATE in a molecule—intramolecular and intermolecular.

18.

Why are intramolecular forces stronger than intermolecular forces?

Answer»

$Ello ❤$

There are TWO KINDS of forces, or ATTRACTIONS, that OPERATE in a molecule—intramolecular and intermolecular.

Discussion

19.	Which gas is used for the oxidation of oxygen for the respiration of deep sea divers?
Answer» Your ANSWER is :- Helium gas is used for the OXIDATION of oxygen for the respiration of deep SEA drives because it reduce the PROPORTIONS of nitrogen and oxygen below those of air, to ALLOW the gas mix to be breathed safely on deep dives

Discussion

20.	Why temperature remains constant at melting and boiling point of substances?
Answer» PLEASE SEE on GOOGLE or CHORME DEAR

Discussion

21.	Why oxalic acid is used in redox titration using permanganometry quora?
Answer» Answer: As you may know, HCl is much stronger than Oxalic acid, it will react with KMnO4 to produce the corresponding chlorides of Potassium and Manganese along with liberation of Chlorine gas. This results in DEFICIENCY of total amount of KMnO4 available for the reaction with Oxalic acid, THEREBY affecting your redox titration. The equation for the reaction is as given below: KMnO4 + 16HCl ==> 2KCL + 2MnCl2 + 8H2O + 5Cl2 Hope this helps. All the best! mark me as brainleist.

21.

Why oxalic acid is used in redox titration using permanganometry quora?

Answer»

Answer:

As you may know, HCl is much stronger than Oxalic acid, it will react with KMnO4 to produce the corresponding chlorides of Potassium and Manganese along with liberation of Chlorine gas. This results in DEFICIENCY of total amount of KMnO4 available for the reaction with Oxalic acid, THEREBY affecting your redox titration.

The equation for the reaction is as given below:

KMnO4 + 16HCl ==> 2KCL + 2MnCl2 + 8H2O + 5Cl2

Hope this helps. All the best!

mark me as brainleist.

Discussion

22.	Why is ammonium chloride is dissolved in water test tube becomes cool?
Answer» ANSWER: When ammonium chloride is dissolved in water, the test TUBE becomes cold because it is an endothermic reaction. ... In the given case, ammonium chloride absorbs HEAT from the solvent which is the water, thereby making the water cold. The TEMPERATURE of the water drops rapidly when the reaction takes PLACE.

22.

Why is ammonium chloride is dissolved in water test tube becomes cool?

Answer»

ANSWER:

When ammonium chloride is dissolved in water, the test TUBE becomes cold because it is an endothermic reaction. ... In the given case, ammonium chloride absorbs HEAT from the solvent which is the water, thereby making the water cold. The TEMPERATURE of the water drops rapidly when the reaction takes PLACE.

Discussion

23.	Which is more reactive towards nucleofilic addition reaction between alkyne and alkene?
Answer» MAY be ALKYNE is more REACTIVE BEACAUSE it have more elctronegative CARBON

Discussion

24.	Trick to find the products of chemistry reactions
Answer» GUESS it or ELSE DIE

Discussion

25.	When sugar is dissolved in water the resulting solution is classified as a?
Answer» HOMOGENEOUS MIXTURE

Discussion

26.	When sugar is dissolved in water it dissappears.That means it must have changed into new substance.Therefore dissolving is chemical change.Do u agree?
Answer» No dissolving of SUGAR in WATER is not a chemical change because the dissolved sugar can be again obtained by the PROCESS of distillation . So it is a physical change . Hope this will HELP you .

Discussion

27.	Give me examples for fast,slow, reversible and irreversible changes
Answer» One example of slow CHANGE is burning of cotton . One example of fast change is burning of different synthetic fibres . Reversible change is DISSOLVING of sugar into water . IRREVERSIBLE change is cooking of FOOD . hope this will help you .

Discussion

28.	Why do micelles not precipitate on solution?
Answer» Because the micelles are insolube substance that floats on the water when CALCIUM and MAGNESIUM of soap reacts with the ions present in the HARD water

Discussion

29.	Why chloroethane is not soluble in water and chloropropane is slightly soluble in water?
Answer» The haloalkanes are slightly soluble in water. Less energy is released when new attractions are SET up between the HALOALKANE and the water MOLECULES as these are not as strong as the original hydrogen BONDS in water. As a result, the solubility of haloalkanes in water is low.

29.

Why chloroethane is not soluble in water and chloropropane is slightly soluble in water?

Answer»

The haloalkanes are slightly soluble in water. Less energy is released when new attractions are SET up between the HALOALKANE and the water MOLECULES as these are not as strong as the original hydrogen BONDS in water. As a result, the solubility of haloalkanes in water is low.

Discussion

30.	hydrogen is considered as a future fuel mention advantage of hydrogen as a fuel ? ( 5 advantages max )
Answer» Advantages of hydrogen are: 1) It is not a POLLUTANT. Does not HARM the environment. 2) It has a high calorific value. 3) It does not produces residues like ASHES after burning. 4) When hydrogen burns, pollutants like CARBON dioxide are NOT produced. 5) Hydrogen is used in fusion - reactions of nuclear energy. The enormous heat so produced breaks the fused He nucleus into hydrogen atoms which again joins to form a He atom, releasing a lot of energy. In this way, the hydrogen atoms (or molecules) can create a LONG self-sustaining energy chains that would keep releasing large amounts of energy.

Discussion

31.	Which of the three elements be mg and ca will be most reactive give reasons?
Answer» Ca will be most reactive Ca has to LOSE 2 electrons from its 3RD SHELL which is EASIER than to lose 2 electrons of mg from the 2ND shell

Discussion

32.	What is the reaction between sodium thiosulphate and hydrochloric acid?
Answer» Heyaa☺ ______________________ In the reaction between SODIUM thiosulphate and hydrochloric acid porduce sulphur,sulphur DIOXIDE and water. _______________________ Hope you UNDERSTAND..✌ #Bebrainly Together we go FAR.

Discussion

33.	Que=> oxidation number of H2SO5 is :-★ explain How to find it ★
Answer» ɧeՎ ԲՐɿeՌԺ ɧeՐe ɿՏ ՎԾՄՐ ԹՌՏաeՐ =============================== ⊙ We know that oxidation number of H = +1 ⊙ We know that oxidation number of 0 = -2 ⊙ LET s = x ⊙ so, => $(1 \times 2) + x + ( - 2) \times 5 = 0$ $2 + x - 10 = 0 \\ \\ 2 + x = 10$ $x = 10 - 2 = 8$ so, oxidation number is 8 $hope \: it \: helps$ $prabhudutt$

Discussion

34.	It is organic chemistry
Answer» 2 METHYL 3 ETHYL pentane as methyl group is ATTACHED to 2 CARBON and ethyl group is attached to 3 carbon.

Discussion

35.	Two properties that copper is chosen to make cooking utensils
Answer» COPPER is GOOD CONDUCTOR of heat. copper is HIGHLY MALLEABLE.

Discussion

36.	Which is added to commercial alcohol to make it denatured?
Answer» Mathanol is ADDED in ETHANOL to MAKE DENATURED ALCOHOL

Discussion

37.	Which has the highest reactivty for nucleophilic addition?
Answer» Heyaa☺ ______________________ 》Aldehydes has the HIGHEST reactivity for NUCLEOPHILIC addition. _______________________ Hope you UNDERSTAND..✌ #Be brainly Together we GO far..

Discussion

38.	Arrange in increasing order of boiling point C2H5NH2, (C2H5)2NH, (CH3)3N
Answer» (CH3)3N

Discussion

39.	What is the basic difference between electron negativity and electron affinity?
Answer» Heyaa☺ ____________________ 》Difference between electron negativity and electron affinity is ➡Electron negativity is applied only for a single ATOM. ➡Electron affinity is applied for EITHER an atom or molecule. ______________________ Hope you understand.. ✌ #Bebrainly Together we GO far.

Discussion

40.	Difference b/w van dal waals forces and van dal waal equation?
Answer» There is no force of attraction between the particles.) ... The weak intermolecular bonds in LIQUIDS and solids are therefore often CALLED van der Waals forces. The van der Waals EQUATION is used today to give a better fit to the experimental DATA of real GASES than can be obtained with the ideal gas equation.

Discussion

41.	Color produced by universal indicator in dil. hcl
Answer» HEY !! color produced by UNIVERSAL INDICATOR in dil. HCL will be red ...

Discussion

42.	in the reaction A+B =C+D the concentration of A,B,C,D in moles/litre are 0.5,0.8,0.4,1.0 respectively the equilibrium constant is
Answer» KEQ=[C][D]/[A][B] Keq = 1.0x0.4/0.8x0.5 = 1.0

Discussion

43.	Acetic acid reaction with red phasphoras presence of chlorine
Answer» It NAME is helvohard zaliski when acitic ACID react with RED phasphoras in the presence of CHLORINE it give ALPHA chloro acitic acid

Discussion

44.	Which gives difference between aldehyde and ketone1) fehling's solution 2) tollen's reagent 3) schiff's reagent 4) all of these?
Answer» All of these is the ANS

Discussion

45.	A(g) is 90% converted in to B according to the reaction A(g) 3B(g) value of (D/d) at this point is ? correct ans. is 2.8 but i am getting 1.9
Answer» TOTAL MOLES here is 1+2x So D/d= 1+2x = 1+(2*90/100) =1+9/5 =14/5=2.8

45.

A(g) is 90% converted in to B according to the reaction A(g) 3B(g) value of (D/d) at this point is ? correct ans. is 2.8 but i am getting 1.9

Answer»

TOTAL MOLES here is 1+2x

So D/d= 1+2x

= 1+(2*90/100)

=1+9/5

=14/5=2.8

Discussion

46.	What do you mean by pure substance how would you confirm that a colourless liquid given to you is a pure water?
Answer» Pure substances are DEFINED as substances that are made of only one TYPE of atom or molecule. if that colourless liqiud starts boiling exactly at 100°C then it is water BCOS other colourless liquids like vinegar donot BOIL exactly at 100°C. another way is by TESTING it with pH paper, if its colour remains same it is water bcos pH of water is 7 which is nuetral.. hope it helps u..

Discussion

47.	Please answer Q. No 6 and 7
Answer» Not fully SURE for 6 but a conjugate ACID base pair take together forms neutral solñ so i will go with KaKb=Kw and for q 7 ans is K1>k2>k3 because on further DISSOCIATION of H2Po4. has more affinity towards H and the affinity also INCREASES when HPo4 is dissociated so the Keq decreases

Discussion

48.	Volume occupied by one molecules of water (density =1 g cm -3) is.......
Answer» DENSITY of water is approximately 1g/ml Thus 1g of water occupy volume = 1 ml Molar mass of water = 18 g/mol Number of moles of water in 1g = 118 moles = 0.055 moles H2O Now 18 g water CONTAIN = 6.022×1023molecules H2O Thus 1 g water will have = 6.022×102318 MOLECULES H2O = 0.334 ×1023 molecules H2O This shows that 0.334 ×1023 molecules H2O will occupy volume = 1 ml Therefore volume occupied by 1 H2O molecule = 10.334×10−23 = 2.99 ×10-23 ml Thus volume occupied by 1 H2O mlecule is 2.99 ×10-23 ml.

Discussion

49.	ExplainBubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.
Answer» This is BCOS of the formation of WHITE coloured CALCIUM carbonate which is MILKY..

Discussion

50.	Name the acid which is used as preservative in food
Answer» Benzoic ACID and SODIUM BENZOATE is used ASA food preservative.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How did Mendeleev knew the Sanskrit word 'eka'(one) ?

How will u prepare chloroform gas in the laboratory????

Write in brief about the basic details and the role of sewage system

Write the chemical equation for the decarboxylation of ethanoic acod.

Hybridization of water

What is meant by 1 mole of atom

Please answer all three questions???? I mark you as brainlist!!

Briefly describe how the personal dosimeter works

What is The Molecular Formula Of Ethane

What Is The Molecular Formula Of Methane

No SpamsSpams will be reported What is the formula to calculate no of ionsCorrect answer will be mark as brainliest

Write the name and structural formula of all the possible isomers of hexane

Write an example of compound formed with cl(group 17 in period table)

8 gm 's' ae burnt to form SO2 WHICH IS oxidised by chlorine water.thesolution is treated with BaCl2 sol.the amount of BaSO4 precipitate is a)1 mole b)0.25 mole c)0.5 mole d)0.125 mole

Why molecules with lone pairs opposite to each other didn't exists?

The pressure of h2 required to make the potential of h2 electrode 0 in pure Water at 298k

The pressure of H2 REQUIRED to make the potential of H2 electrode 0 in pure water at 298K is 10-¹⁴ atm

Why gaseous state sodium ion is less stabe than gaseous state sodium atom?

sodium ion has its outermost shell COMPLETE...so it is stable............but sodium atom is LESS stable since it doesn't have its outermost shell complete..... mark as BRAINIEST

Why are intramolecular forces stronger than intermolecular forces?

Which gas is used for the oxidation of oxygen for the respiration of deep sea divers?

Why temperature remains constant at melting and boiling point of substances?

Why oxalic acid is used in redox titration using permanganometry quora?

Why is ammonium chloride is dissolved in water test tube becomes cool?

Which is more reactive towards nucleofilic addition reaction between alkyne and alkene?

Trick to find the products of chemistry reactions

When sugar is dissolved in water the resulting solution is classified as a?

When sugar is dissolved in water it dissappears.That means it must have changed into new substance.Therefore dissolving is chemical change.Do u agree?

Give me examples for fast,slow, reversible and irreversible changes

Why do micelles not precipitate on solution?

Why chloroethane is not soluble in water and chloropropane is slightly soluble in water?

hydrogen is considered as a future fuel mention advantage of hydrogen as a fuel ? ( 5 advantages max )

Which of the three elements be mg and ca will be most reactive give reasons?

What is the reaction between sodium thiosulphate and hydrochloric acid?

Que=> oxidation number of H2SO5 is :-★ explain How to find it ★

It is organic chemistry

Two properties that copper is chosen to make cooking utensils

Which is added to commercial alcohol to make it denatured?

Which has the highest reactivty for nucleophilic addition?

Arrange in increasing order of boiling point C2H5NH2, (C2H5)2NH, (CH3)3N

What is the basic difference between electron negativity and electron affinity?

Difference b/w van dal waals forces and van dal waal equation?

Color produced by universal indicator in dil. hcl

in the reaction A+B =C+D the concentration of A,B,C,D in moles/litre are 0.5,0.8,0.4,1.0 respectively the equilibrium constant is

Acetic acid reaction with red phasphoras presence of chlorine

Which gives difference between aldehyde and ketone1) fehling's solution 2) tollen's reagent 3) schiff's reagent 4) all of these?

A(g) is 90% converted in to B according to the reaction A(g) 3B(g) value of (D/d) at this point is ? correct ans. is 2.8 but i am getting 1.9

What do you mean by pure substance how would you confirm that a colourless liquid given to you is a pure water?

Please answer Q. No 6 and 7

Volume occupied by one molecules of water (density =1 g cm -3) is.......

ExplainBubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

Name the acid which is used as preservative in food