52639 + Interview Questions in Secondary School in Chemistry

1.	100 mLof tap water containing Ca(HCO3)2 was titrated with N/50 HCl with methyl orange as indicaor. If 30mL of HCl was required, the temporary hardness as part of CaCO3 per 10^6 parts of water is Explain with details
Answer» Milli EQUIVALENT of Ca(HCO 3 ) 2 = miili equivalent of CACO 3 = MILI equivalent of HClN 1 V 1 =N 2 V 2 1000×w/(100/2)= 30/50w= 0.03 gFor 100ml the amount of CaCO 3 =0.03 gFor 10 6 = 0.03×10 6 /100=300 ppmExplanation:hope it will helpfull follow me

Discussion

2.	How much substance has been completely burned when the heat of combustion is reached? a) 1 g of substance b) 2 g of substance c) 1 mol of substance d) 2 mol of substance
Answer» a is the RIGHT ANSWEREXPLANATION:PLEASE MARK as BRANLIST

Discussion

3.	When does heat flow between objects stop a) when both objects have the same temperature b) when both objects have high temperatures c) heat flow does not stop d) when both objects have low temperatures
Answer» when both OBJECT have the same TEMPERATURE.

Discussion

4.	How many kpa’s are in 400 torr? a) 25 kpa b) 400 kpa c) 53.3 kpa d) 101.3 kpa
Answer» 53.3 kpaYou just have to CONVERT.

Discussion

5.	Mcqs of matter in our sourroundings
Answer» i m that masterExplanation:

Discussion

6.	Unscramble the words 1) LRATIVU 2) CEPURTSM 3) NSDIRPIOES 4) ECNRTIEFLO 5) CFENIAORRT
Answer» 1. virtual 2. spectrum3. dispersion4. REFLECTION5. refractionExplanation: if U are SATISFIED with my answer then don't forget to thank me and if POSSIBLE put this answer as the brainliest

Discussion

7.	How are elements arranged in the periodic table?
Answer» TION:if it is WRITE ,so WELCOME

Discussion

8.	The no of moles of Co which contains 8g of oxygen
Answer» grams of OXYGEN will be in (1 x 8)/32 MOLES of CO2 = 0.25 moles#MARK me brainliest

Discussion

9.	A candle is 30 cm high. What is the height of its image on the plane mirror
Answer» HEIGHT of its image on the plane MIRROR is ALSO same I.e. 30 cm.

Discussion

10.	Reduction of benzoic acid with diborane gives
Answer» Diborane, B2HThis REMAINS a primary APPLICATION of this reagent, but it also EFFECTS RAPID and complete reduction of carboxylic ACIDS, amides and nitriles. Other than LAH, this reagent provides one of the best methods for reducing carboxylic acids to 1º-alcohols.Explanation:please mark as branlist

Discussion

11.	How are you still alive or dead
Answer» EXPLANATION:YEA.... I AM STILL ALIVE....THAT'S Y I ANSWERED UR QUESTION.

Discussion

12.	1. Write balanced chemical equations for the reactions of (i) iron with steam (ii) sodium and potassium with water2. Explain why calcium metal after reacting with water starts floating on its surface . Give chemical equation for the reaction .1. Write balanced chemical equations for the reactions of (i) iron with steam (ii) sodium and potassium with water2. Explain why calcium metal after reacting with water starts floating on its surface . Give chemical equation for the reaction .
Answer» 1.i::-[FeO+Fe2O3] ii::-2X(s) +2H2O(I)+2XOH(aq)+H2(g) 2::That is because the bubbles of hydrogen GAS stick to the surface of metal and that's why CALCIUM metal floats on waterHope it helped u out SOLVING the problem.... Plzz mark brainliest or FOLLOW me.... Plzz

Discussion

13.	Which of the following acts as a nucleophile in the aldol condensation of ethanal?
Answer» EXPLANATION:In ALPHA HYDROGEN CONTAINING aldehydeCH3CHO + OH⁻ -------- CH2CHO⁻ + CH3CHO ----- CH3CH=CH-CHOCH2CHO⁻ OH⁻

Discussion

14.	if an objectis placed at a distance of 7.5 cm from a plane mirror, how far would it be from its image?
Answer» 7.5cm BRO..EXPLANATION: If it is WRITE ,so please mark as brainliest ANSWER

Discussion

15.	Gelatin often used as an ingredient in the manufacture of ice-cream. The reason for this
Answer» EXPLANATION:It PREVENT the FORMATION of Crystaland STABILISE COLLOID

Discussion

16.	Structure of 2 cyano 3 oxopentane dioic acid
Answer» TION:COOH-CH2-C=O-CH(CN)-COOHThanks

Discussion

17.	Explain this 71 question.....
Answer» EXPLANATION: According to the Le chatlier's principle ,the EQUILIBRIUM will shift in the DIRECTION where the number of moles of GAS are more as shift always happens to undo the change.So if we if decrease the pressure the reaction will shift to ards the side which has greater number of moles which is reaction 3 .In reaction 3 the moles of products is greater than the reactants so if pressure is DECREASED ,the Equilibrium will shift towards the product side.

Discussion

18.	In presence of which metal ion among the following, amylase is catalytically very active?
Answer» Explanation: amylase is catalytically very ACTIVE in NACL solution which containsNa+ cation

Discussion

19.	For the coagulation of 50 ml of ferric hydroxide sol. 1 ml of 5 M KCl is required. The coagulation value is very close to
Answer» EXPLANATION:m X 50 = 1 x 5m = 0.1 M = 100 MILLIMOLAR

Discussion

20.	Structure of 3-methyl-2-methylene-but-3-enoic acid
Answer» it works i TRIED me BEST.... by the way nice QUESTION .... SORRY for late

Discussion

21.	Plz help for this: Explain which mechanism is consistent with results of the experimental data
Answer» ee question visually just KEEP eye on 4 boxes ...one vertical columns should have same value and other must change then see what happens to PRODUCT ....keep CH3 VALA constant first then OH vala constant and see how RATE affects .Explanation: u will see that rate is not affected by oh CONC and only reaction iii) has reactant where OH is absent answer is 3

Discussion

22.	CH=CH-CH-CH2-CHO IUPAC NAME
Answer» oper Structure then we will GAVE ANSWER .The structure GIVEN by you is Wrong.Please FOLLOW me

Discussion

23.	The molecular formula of alcohol is c4h10o.
Answer» what u wanna ASK please CHECK.....

Discussion

24.	ᵂᴴᴬᵀ ᴵˢ ᴿᴬᴰᴵᴼᴬᶜᵀᴵᵛᴵᵀᵞ?
Answer» TION:Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation.The property of EMISSION of radioactive rays from radioactive element is termed as radioactivity . Atoms become unstable due to large NEUTRON to proton ratio. Such unstable nucleus emitted some radiations and convert into someone other STABLE nucleus and know as radioactive raysHope u understand

Discussion

25.	plz ..someone answer it....plz ...it's for 10 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..
Answer» iodine will GET removed during the 5 MEMBERED ring formation.Explanation:to remove the steric REPULSIONS of iodine and NITRO group.

Discussion

26.	What are redicals. Some examples of: monovalent, divalent, trivalent tetravalent, pentavalent .
Answer» sorryneed more OINTS to ASK QUESTIONS .... helpExplanation:

Discussion

27.	11. Define the following terms: a) Atomic number b) Mass number
Answer» Number : The number of protons in the NUCLEUS of an atom determines an element's atomic number. In other WORDS, each element has a unique number that identifies how many protons are in one atom of that element. For example, all HYDROGEN atoms, and only hydrogen atoms, CONTAIN one proton and have an atomic number of 1.Mass Number : the total number of protons and neutrons in a nucleus.

Discussion

28.	In what ways does the reaction b/w a metal and an acid differ from the reaction b/w a metal and a base??
Answer» TION:•When acids react with metals they form hydrogen gas and salt.For example- When dilutedilute SULPHURIC ACID reacts with zinc metal then zinc SULPHATE and hydrogen gas are formed.• When bases react with metals they also form hydrogen gas and metal salt.For example-when sodium hydroxide SOLUTION is heated with zinc then sodium zincate and hydrogen gas are formed.MARK AS BRAINLIEST PLEASE ❤️THANK YOU

Discussion

29.	plz ..someone answer it....plz ...it's for 120 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..
Answer» iodideExplanation:leaving tendency of IODINE is GREATER as bond lengths is more DUE to BIG size and fluorine is small and has small bondlength and takes TIME to remove

Discussion

30.	Why should i hire you in school marathi
Answer» can't UNDERSTAND your QUESTION

Discussion

31.	Industrial manufacture of hydrogen
Answer» Hydrogen PRODUCTION is the family of industrial methods for generating hydrogen gas. As of 2020, the majority of hydrogen (∼95%) is produced from fossil fuels by STEAM REFORMING of NATURAL gas, partial oxidation of methane, and coal GASIFICATION.

Discussion

32.	Why is HNO3 kept in glass bottles and not metal bottles?
Answer» ss CONTAINERS are used because Glass bottles do not react with the acids as glass is mostly composed of silica (SIO2)THUS, if acids are STORED in metal containers, they will react with the metal to produce the corresponding metal salt and HYDROGEN gas.That's is why acids are not stored in metal containers.

Discussion

33.	Which substance contains free-floating valence electrons? O2 NaCl KBr Cu
Answer» KBR is the RIGHT ANSWER of this QUESTION

Discussion

34.	Which subatomic particle can change the molecular geometry of a molecule? Electrons Protons Neutrons Quarks
Answer» ElectronExplanation:PLEASE MARK as BRANLIST

Discussion

35.	According to the kinetic theory of gas particles, when do gas particles have some type of force between them? a) when the volume increases b) when the pressure on the gas particles decreases c) when the gas particles collide d) when the temperature increases
Answer» SORRY BRO it's TOOOOOO HARD

Discussion

36.	Give example of 2 metals which have low melting point?
Answer» GALLIUM and CESIUM are the two metals which shows low MELTING PT.

Discussion

37.	Which of the following is alkaline A)C4H10 B)C4H8 C)C4H6 D) C6H6
Answer» H of the FOLLOWING is ALKALINE A)C4H10 B)C4H8 C)C4H6 D) C6H6✒ C4H8

Discussion

38.	Pls solve this question. explain
Answer» R answer is in the GIVEN ATTACHMENT HOPE IT IS HELPFUL ❤#thank you#❤

Discussion

39.	This question please answer
Answer» for convenience consider 0.X as x ... ans 1atm i.e 0.1Explanation:now as TOTAL pressure REMAIN CONSTANT as equilibrium attanined 3+2+6 = Tp=11now two are twiced i.e 3×2=6 and 2×2=4now 6+4+partial pressure of pcl5 = Tp=11now 11-10= 1

Discussion

40.	List the characteristics of physical change
Answer» ysical change,no new substance is formed.most of the PHY. changes are reversible.it means change in colour, size , shape, state etc.only physical properties are CHANGING here.Ex. melting of ice.Hpoe it helps you matePlzz MARK As BRAINLIEST ✌✌

Discussion

41.	What causes metallic bonds to form?
Answer» Explanation:In metallic BONDS, the valence electrons from the s and p orbitals of the interacting METAL atoms delocalize. That is to SAY, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic NUCLEI of the interacting metal ions.Metals are shiny.

Discussion

42.	When filled 12. A 500-cc bulb weighs 38.734 grams when evacuated and 39.3135 gramswith air at 1 atm pressure and 24°C. Assuming that air behaves as an idealat this pressure, calculate effective mass of 1 mole of air.(28-2919 Adesiccator of internal volume of 1 litre and containing nitrogen at 1 atm pressure
Answer» 22+22+2+2+2+23232+535353323+55859+558+569+536+5539+583+453+529+486+483+558+58*+585+558+548+55+566+558+

Discussion

43.	The radius of nucleus of 27 13 Al will be :- 1] 1.2 x 10 ^ -15 m 2] 2.7 x 10 ^ - 15 m 3} 10. 8 x 10 ^-15 m 4] 4 x 10 ^-15 m please answer quicly i need it urgently
Answer» friend can you mark as BRAINLIEST I just only this then I will FOLLOW you and THANKS your EVERY answer

Discussion

44.	The % loss in weight after heating a pure sample of potassium chlorate (M. wt. 122.5) will be
Answer» a pure SAMPLE of potassium chlorate will be 39.17. THEREFORE, PERCENTAGE loss of weight in KCLO3 on thermal decomposition is 39.18 %.EXPLANATION:mark my answer brainliest

Discussion

45.	What is the molecular geometry for the molecule IF5? Seesaw Tetrahedral Octahedral Square pyramidal
Answer» STRUCTURE of IF5 predicted from VSEPR. IF5 contains five bonded and one nonbonded electron domains, giving an octahedral e- domain geometry and a SQUARE PYRAMIDAL MOLECULAR geometry.

Discussion

46.	Which group of elements will form molecular compounds? (Choose all that apply) Lithium and Bromine Sodium and Iodine Sulfur and Oxygen Carbon and Hydrogen
Answer» SULFUR & Oxygen.Explanation:Sulfur & Oxygen.It is because both are ELECTRONEGATIVE.

Discussion

47.	Under what soil condition do you think a farmer would spread or treat the soil of his fields with quick lime (CaO) or slaked time (CaC03) ? a.When the pH of the soil increases b.When the nutrients of the soil is lost c.When the pH of the soil decreases d.All of these
Answer» TION:PH of SOIL incereases OPTION(a)

Discussion

48.	Define following terms- i. Rigidity ii. Compressibility iii. Density
Answer» sibility-the property in which the object can the pressed with full powerdensity- MASS per unit VOLUME is called densityplease PLEASE please MAKE me brainliest

Discussion

49.	Which is the correct product for the following reaction . explain
Answer» BEXPLANATION:PEROXIDE EFFECT/kharash effect is not APPLICABLE with HI.

Discussion

50.	Hydrochloric acid+sodium chloride_-___
Answer» nacl+h2oExplanation:HYDROCHLORIC acid+sodium chloride=nacl+h2o

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

100 mLof tap water containing Ca(HCO3)2 was titrated with N/50 HCl with methyl orange as indicaor. If 30mL of HCl was required, the temporary hardness as part of CaCO3 per 10^6 parts of water is Explain with details

How much substance has been completely burned when the heat of combustion is reached? a) 1 g of substance b) 2 g of substance c) 1 mol of substance d) 2 mol of substance

When does heat flow between objects stop a) when both objects have the same temperature b) when both objects have high temperatures c) heat flow does not stop d) when both objects have low temperatures

How many kpa’s are in 400 torr? a) 25 kpa b) 400 kpa c) 53.3 kpa d) 101.3 kpa

Mcqs of matter in our sourroundings

Unscramble the words 1) LRATIVU 2) CEPURTSM 3) NSDIRPIOES 4) ECNRTIEFLO 5) CFENIAORRT

How are elements arranged in the periodic table?

The no of moles of Co which contains 8g of oxygen

A candle is 30 cm high. What is the height of its image on the plane mirror

Reduction of benzoic acid with diborane gives

How are you still alive or dead

Which of the following acts as a nucleophile in the aldol condensation of ethanal?

if an objectis placed at a distance of 7.5 cm from a plane mirror, how far would it be from its image?

Gelatin often used as an ingredient in the manufacture of ice-cream. The reason for this

Structure of 2 cyano 3 oxopentane dioic acid ​

Explain this 71 question.....

In presence of which metal ion among the following, amylase is catalytically very active?

For the coagulation of 50 ml of ferric hydroxide sol. 1 ml of 5 M KCl is required. The coagulation value is very close to

Structure of 3-methyl-2-methylene-but-3-enoic acid​

Plz help for this: Explain which mechanism is consistent with results of the experimental data

CH=CH-CH-CH2-CHO IUPAC NAME

The molecular formula of alcohol is c4h10o.

ᵂᴴᴬᵀ ᴵˢ ᴿᴬᴰᴵᴼᴬᶜᵀᴵᵛᴵᵀᵞ?

plz ..someone answer it....plz ...it's for 10 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..​

What are redicals. Some examples of: monovalent, divalent, trivalent tetravalent, pentavalent .

11. Define the following terms: a) Atomic number b) Mass number

In what ways does the reaction b/w a metal and an acid differ from the reaction b/w a metal and a base?? ​

plz ..someone answer it....plz ...it's for 120 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..​

Why should i hire you in school marathi

Industrial manufacture of hydrogen

Why is HNO3 kept in glass bottles and not metal bottles?​

Which substance contains free-floating valence electrons? O2 NaCl KBr Cu

Which subatomic particle can change the molecular geometry of a molecule? Electrons Protons Neutrons Quarks

According to the kinetic theory of gas particles, when do gas particles have some type of force between them? a) when the volume increases b) when the pressure on the gas particles decreases c) when the gas particles collide d) when the temperature increases

Give example of 2 metals which have low melting point?

Which of the following is alkaline A)C4H10 B)C4H8 C)C4H6 D) C6H6

Pls solve this question. explain

This question please answer ​

List the characteristics of physical change​

What causes metallic bonds to form?

The radius of nucleus of 27 13 Al will be :- 1] 1.2 x 10 ^ -15 m 2] 2.7 x 10 ^ - 15 m 3} 10. 8 x 10 ^-15 m 4] 4 x 10 ^-15 m please answer quicly i need it urgently

The % loss in weight after heating a pure sample of potassium chlorate (M. wt. 122.5) will be

What is the molecular geometry for the molecule IF5? Seesaw Tetrahedral Octahedral Square pyramidal

Which group of elements will form molecular compounds? (Choose all that apply) Lithium and Bromine Sodium and Iodine Sulfur and Oxygen Carbon and Hydrogen

Under what soil condition do you think a farmer would spread or treat the soil of his fields with quick lime (CaO) or slaked time (CaC03) ? a.When the pH of the soil increases b.When the nutrients of the soil is lost c.When the pH of the soil decreases d.All of these

Define following terms- i. Rigidity ii. Compressibility iii. Density

Which is the correct product for the following reaction . explain ​

Hydrochloric acid+sodium chloride_-___​

Structure of 2 cyano 3 oxopentane dioic acid

Structure of 3-methyl-2-methylene-but-3-enoic acid

plz ..someone answer it....plz ...it's for 10 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..

In what ways does the reaction b/w a metal and an acid differ from the reaction b/w a metal and a base??

plz ..someone answer it....plz ...it's for 120 points...it's SN reaction...will iodide gets removed or flouride..it's of 12th std or may be for 11th too..

Why is HNO3 kept in glass bottles and not metal bottles?

This question please answer

List the characteristics of physical change

Which is the correct product for the following reaction . explain

Hydrochloric acid+sodium chloride_-___