52639 + Interview Questions in Secondary School in Chemistry

1.	Which of the following is crude petroleum products?DieselKeroseneNaphthaAll of the above
Answer» dieselall of the above

Discussion

2.	Describe the bonding in a typical metal
Answer» Metallic bonding may be described as the sharing of FREE ELECTRONS among a lattice of POSITIVELY charged metal ions. The structure of metallic BONDS is very different from that of covalent and ionic bonds. ... In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal ATOMS delocalize.

Discussion

3.	in joining railway tracks or cracked machine parts reaction of Fe2o3 with aluminium is utilised give reason
Answer» eaction (metal OXIDE with aluminium) are highly exothermic(large amount of HEAT is released ). Due to the large amount of heat produced , the metals are produced in molten state. This reduction PROPERTY of aluminium is used in welding BROKEN PIECES of heavy iron objects like railway tracks.

Discussion

4.	explain why volume times normality of one reagent is equal to volume times normality of each of the other reagent in the reaction
Answer» hjhhhhhhhhhhhhhhhhhhhhhhh

Discussion

5.	Which has is heavier than air (A)hydrogen,(B) oxygen,(C) nitrogen,(D)carbon monoxide
Answer» tion:SINCE Nitrogen is number 15 on the periodic table and Oxygen is 16, Oxygen or any GAS higher on the periodic table would be heavier than AIR.

Discussion

6.	The maximum number of carbon atomsarranged linearly in the molecule,CH3 -C=C-CH=CH2 is
Answer» 5Explanation:the maximum NUMBER of CARBON ATOMS arranged linearly inthe molecule,CH3-C=C-CH=CH2 is five

Discussion

7.	When moist H2S reacts with halogens, thehalogensW
Answer» W - TUNGSTEN It brokes MARK as BRAINLIEST PLEASE

Discussion

8.	Among the following iso structural perisNE, PEBFS. NESPCI, ICIXeFs, SF
Answer» dnxncncdjdccjdcjcmrncmckfmd

Discussion

9.	Write chemical formula for the foolowing compunds: i) Common Salt(Sodium Chloride) ii) Washing Soda (Sodium Carbonate) iii) Marble (Calcium Carbonate) Iv) Rust (ferric oxide) and v) Strong Acid
Answer» NAOH.. CaCO4fe..MARK me as BRAINLIEST PLEASE

Discussion

10.	The co-ordination no. of atom's in bcc crystal lattice isa. 2b. 4c. 6d. 8
Answer» d)8 I GUESS BRO ................

Discussion

11.	Is reaction of ammonia &water is endothermic or exothermic
Answer» When ammonium nitrate is DISSOLVED in WATER, it produces an endothermic REACTION, i.e. energy is taken in by the system from its surroundings in the form of heat. When the nitrate ION is separated from the ammonium ion by the polar water MOLECULES, an endothermic reaction takes place

Discussion

12.	When calcium carbonate is heated, it decomposes to give___________ and _________.
Answer» tion:it DECOMPOSES into CALCIUM OXIDE and carbon DIOXIDE

Discussion

13.	Why does our Palm feel cold when we put some petrol or perfume on it? Give correct answer and I'll mark your answer as brainlist answer :)
Answer» EXPLANATION:The perfume and PETROLEUM are highly volatile, MEANING, they are in a hurry to get converted to vapors. To do this, they ABSORB latent heat of VAPORIZATION from our palm and get converted into gaseous state. As the heat is absorbed from our palm, our palms feel cold. Please mark as the brainliest as promised.

Discussion

14.	Explain the mineral acid and organic acids ?
Answer» tion:Mineral acids are KNOWN as INORGANIC acids.The main difference between the mineral acid and inorganic acid is that mineral acid are inorganic compounds composed of DIFFERENT chemical element combination WHEREAS organic acid are organic compounds ESSENTIALLY composed of carbon and hydrogen atoms

Discussion

15.	Find the odd one out.. Silicon Arsenic Antimony Platinum
Answer» It's platiniumExplanation:PLEZ MARK me as BRAINLIST

Discussion

16.	Why it is important to know and understand the structure and nature of an atom? Name basic concept in chemistry that would not have been realized if the subatomic particles of the atom was not discovered.
Answer» PUT briefly and simply, the ATOMIC structure of a compound is a key component to understanding the reactivity and behavior of chemicals. Just by looking at the structure of a molecule, a chemist can PREDICT many things about a CHEMICAL such as : Boiling and MELTING points. Acidity/basicity.HOPE IT'S HELPFUL Plz mark as BRAINLIEST.

Discussion

17.	Why is it necessary to balance chemical equation in order to satisfy
Answer» It is IMPORTANT to balance CHEMICAL equations because there must be an equal number of atoms on both sides of the equation to follow the LAW of the CONSERVATION of Mass.

Discussion

18.	When a certain number of hydrogen ions are mixed with the same number of hyroxide ions occur. Less acid More acid Neutralization
Answer» the ANSWERS is NEUTRALIZATION

Discussion

19.	Calculate mass percentage of solution containing 20% of naoh.
Answer» TION:Let X be the MASS of solution.Mass of NaOH=100x×20Molar mass of NaOH=40g∴ Number of MOLES= (10020x)/40=200xNow mass of solvent in the solution= x−10020x=10080x∴ Molality= (80x/100)x/200×1000=6.25M

Discussion

20.	Elements A,B,C,D have atomic numbers 17,8,10,11 respectively.Which is a noble?
Answer» ELEMENT C is NOBLE HOPE it HELPS you

Discussion

21.	A metal can crystallize in both FCC structure and simple cubics structure What idms ratio of cordination no
Answer» (8,8) EXPLANATION:EX :- CSCL Cs+ coordination number is 8 Cl- coordination number is 8 Cscl has FCC structure So coordination number is 8

Discussion

22.	More electronegative elements can form bond between themselves.justify.
Answer» More ELECTRONEGATIVE elements can form bond between themselves. ... More electronegative atoms have EQUAL or nearly equal electron affinities and electro negativities. They do not allow TRANSFER of electron from one ATOM to another. In this way, they get stability by the process of SHARING of electrons.

Discussion

23.	200g of CaCo3 sample produced 5.6L of co2 after complete decomposition. calculate the % purity of the sample
Answer» soapफु6 graphicরপ৯়তট

Discussion

24.	Uh..does anyone know how to do this???
Answer» HEY mate here's your answer EXPLANATION:Plz MARK my answer as the BRAINLIEST

Discussion

25.	Name the by product produced in chlor alkali process and write two uses of each
Answer» NAOH, CL,HExplanation:

Discussion

26.	. If the reaction of 40.8 grams of C6H6O3 with oxygen produces a 39.0% yield, how many grams of water would be produced?
Answer» EXPLANATION:c6h6o3 + o2 = 6co2+3h2ohere o2 is excess so c6h6o3 is LIMITING reagentfind limiting RATIO of c6h6o3 = moles / stichiometric coefficient moles of c6h6o3 =0.317limiting ratio = 0.317moles of H2O produced when 100 percent yeildlimiting ratiostichiometric coefficient of h2o0.31730.951moles of h2o produced when 80 percent yeild0.8*0.9510.761moles of h2o = 0.761w/18=0.761w=13.71 GM

Discussion

27.	Explain why XA=1.11 cannot be correct
Answer» ic ABERRATION is produced when light passes througha material, as it does when PASSING through the glass of a lens. A mirror, silvered on its front surface never has light passing through it, so this aberration cannot occur. This is only one of many reasons why large TELESCOPES use mirrors rather than lenses for their primary OPTICAL elements.

Discussion

28.	Plz help me in this
Answer» 1. BLOOD4. whiteExplanation:marks it as BRILLIANT ANS. and FOLLOW

Discussion

29.	हीमोग्लोबीन (अणुभार = 67200) में लोहा 0.334% भार से \| है। हीमोग्लोबीन के एक अणु में लोहे के कितने परमाणु है :\| (1)1 (2)2 (3)3 (4)4
Answer» I said to all PEOPLES and I am also saying to you that PLEASE WRITE this QUESTION in ENGLISH.

Discussion

30.	H c h bond angle in methane is
Answer» ACCORDING to VSEPR theory, methane has a tetrahedral structure which is multiplanar, in which carbon atom LIES at the centre and the four hydrogen atoms lie at the four corners of a REGULAR tetrahedron. All H-C-H bond ANGLES are of 109.5°.

Discussion

31.	Molecular solids are a. Crystalline solids b. Amorphous solids c. Ionic solids d. Metallic solids
Answer» TION:A molecular solid is a solid consisting of discrete molecules. The COHESIVE FORCES that bind the molecules TOGETHER are van DER Waals forces, dipole-dipole interactions, quadrupole interactions, etc

Discussion

32.	Shape of C2 h5 molecule
Answer» HOPE THIS HELPS YOU MARK ME AS BRAINLIEST FOLLOW ME

Discussion

33.	A shiny brown coloured element 'x' on heating in air becomes black in colour name the element 'x'and the black colour compound formed
Answer» copper oxide 17: A shiny brown COLOURED element 'X' on heating in air BECOMES black in colour. Name the element 'X' and the black coloured compound formed. The shinny brown colored element 'X' is copper. When it is heated in air, it becomes black due to the deposit of copper oxide.hope it helps u buddyplzz mark my ans as a brainliest ONE

Discussion

34.	The heat of formation of crystalline sodium chloride is -410 kJ mol-1. The heat of sublimation of sodium metal is 180.8 kJmol-1. The heat ofdissociation of chlorine gas into atoms is 242.7 kJ mol-1. The ionisationenergy of Na and electron affinity of Cl are 493.7kJ and -368.2 kJrespectively. Calculate the lattice energy of NaCl.
Answer» 1) The heat of FORMATION of crystalline SODIUM CHLORIDE is -410 kJ mol-1. The heat of sublimation ...

Discussion

35.	Calculate the mass of 2.24litre of so2 gas at STP
Answer» Explanation:MOLAR MASS OF S02, M = 32+216 [ S= 32, O= 16] M = 32+32 M = 64 G22.4 LITRES.AT STP , 1 MOLE = MOLAR MASS1 MOLE = 22.4 LITRES.64 G = 22.4 LITRES.THEREFORE,MASS OF 2.24 LITRES=2.2464/22.4 =6.4 LITRES.HOPE THIS HELPS.

Discussion

36.	Why this compound end with ate ? Diamminesilver(1) dicyanidoargentate(1)
Answer» TION:FIND It in a book.Ch. Coordination Compounds Class 12topic : NAMING of Complexes

Discussion

37.	Ch3_(ch3)_ch2_oh iupasc Name
Answer» AcetisonitrileExplanation:In CH3-N TRIPLE bond C, N triple bond C is ISONITRILE and SINCE it has 2 carbon we add the Acet prefix so the IUPAC name is "Acetisonitrile"

Discussion

38.	Name the phenomenon which causes one crystal of potassium permanent magnet to turn a beaker of water purple
Answer» PROPERTY of DIFFUSION

Discussion

39.	Calculate the relative molecular masses of the following compounds. A=Glucose C6 H12 O6 B=Sulphuric acid H2 SO4
Answer» A=180B=98Explanation:

Discussion

40.	The ratio of sigma, Pi bonds in CO2 is
Answer» HOPE this HELP you THANKS

Discussion

41.	Which of the following is a comproportionation reaction MnO2 a)2KC103 nQ2KC1 + 302 b)3C12 + 6NaOH → 5NaCl + NaClO3 + 3H2O c)CuCl2 + Cu + Cu2Cl2 d)Zn + CuSO4(aq) ZnSO4(aq) + Cu
Answer» Which of the FOLLOWING is acomproportionation reactionMnO2a)2KC103 nQ2KC1 + 302b)3C12 + 6NaOH → 5NaCl+ NACLO3 + 3H2Oc)CuCl2 + Cu + Cu2Cl2d)Zn + CUSO4(AQ) ZnSO4(aq)+ Cu✔

Discussion

42.	Write the colour change when universal indiator is added to: i) Water ii) Acetic Acid iii)Caustic Soda iv) HCl
Answer» ININNININININININNHVGCRZEZEXUCXEZECTVUNKVTXRXTCT

Discussion

43.	In dilute H2SO4 medium H2O2 reduces MnO4 ion to
Answer» HELLO FRIEND CHAI PEA LO

Discussion

44.	An example of alicyclic compound is Benzene Hexane Cyclohexane Furan
Answer» TION:BENZENE this is the ANSWER

Discussion

45.	Write short note on Iodine deficiency.....
Answer» DEFICIENCY of IODINE LEADS to GOITRE.

Discussion

46.	For the reaction, NH3 + OCI + N2H4 + Cl occurring inbasic medium, the coefficient of N2H4 in thebalanced equation will be
Answer» NH3 + OCI + CL will be the COEFFICIENT of N2H4

Discussion

47.	Tell some indicators and their colour in acidic and bases medium give answer fast it's urgent ☺
Answer» Acid turn blue litmus to red , and base turn red litmus to bluebasic turn TURMERIC to reddish browNAcid change METHYL ORANGE to red and base change in yellowAcid change Phenolphthalein to colourless and base change into pink colour.

Discussion

48.	Write three chemical properties of bases???
Answer» ASES are the substances which have a bitter TASTE, soapy touch and turn red litmus solution to blue.Some examples of bases are: NaOH, KOH etc.Chemical PROPERTIES of Bases:1) Reaction with acids:Acid + base → Salt + Water Examples:NaOH + HCL → NaCl + H2OCa(OH)2 + 2HCL → CaCl2 + 2H2O2) Reaction with metals:Some metals react with bases to liberate hydrogen gas.Examples: 2NaOH + Zn → Na2ZnO2 + H22NaOH + 2Al + 2H2O → 2NaAlO2 + 2H23) Reaction with non-matal OXIDES:Bases react with non metal oxides to produce metal salt + water.Examples: 2NaOH + CO2 → Na2CO3 + H2OCa(OH)2 + CO2 → CaCO3 + H2O

Discussion

49.	Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is
Answer» HClO4Explanation:The strength of the oxy-acids of chlorine increases in the order HClO < HClO2 < HCLO3 < HClO4.Perchloric ACID, HClO4, is supposed to be the strongest of all known SIMPLE acids.For the oxy-acids of any non-metal, higher the oxidation number stronger will be the acid. The oxidation STATES of chlorine in HClO, HClO2, HClO3 and HClO4 respectively are +1, +3, +5, and +7.Hope you got it. Do like it

Discussion

50.	Translate the following into language of chemistry: Sulphur dioxide reacts with oxygen at 450degree c in the presence of a catalyst (v2o3) to form Sulphur trioxide. The reaction is reversible and 182kj of energy is liberated.
Answer» SO₂ + O₂ ⇔ SO₃ (182J) hope it HELPS you buddyplzz mark my ANS as a BRAINLIEST ONE

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following is crude petroleum products?DieselKeroseneNaphthaAll of the above​

Describe the bonding in a typical metal

in joining railway tracks or cracked machine parts reaction of Fe2o3 with aluminium is utilised give reason​

explain why volume times normality of one reagent is equal to volume times normality of each of the other reagent in the reaction

Which has is heavier than air (A)hydrogen,(B) oxygen,(C) nitrogen,(D)carbon monoxide​

The maximum number of carbon atomsarranged linearly in the molecule,CH3 -C=C-CH=CH2 is​

When moist H2S reacts with halogens, thehalogensW​

Among the following iso structural perisNE, PEBFS. NESPCI, ICIXeFs, SF​

Write chemical formula for the foolowing compunds: i) Common Salt(Sodium Chloride) ii) Washing Soda (Sodium Carbonate) iii) Marble (Calcium Carbonate) Iv) Rust (ferric oxide) and v) Strong Acid

The co-ordination no. of atom's in bcc crystal lattice isa. 2b. 4c. 6d. 8​

Is reaction of ammonia &water is endothermic or exothermic

When calcium carbonate is heated, it decomposes to give___________ and _________.

Why does our Palm feel cold when we put some petrol or perfume on it? Give correct answer and I'll mark your answer as brainlist answer :) ​

Explain the mineral acid and organic acids ?​

Find the odd one out.. Silicon Arsenic Antimony Platinum

Why it is important to know and understand the structure and nature of an atom? Name basic concept in chemistry that would not have been realized if the subatomic particles of the atom was not discovered.

Why is it necessary to balance chemical equation in order to satisfy

When a certain number of hydrogen ions are mixed with the same number of hyroxide ions occur. Less acid More acid Neutralization

Calculate mass percentage of solution containing 20% of naoh.

Elements A,B,C,D have atomic numbers 17,8,10,11 respectively.Which is a noble? ​

A metal can crystallize in both FCC structure and simple cubics structure What idms ratio of cordination no

More electronegative elements can form bond between themselves.justify.

200g of CaCo3 sample produced 5.6L of co2 after complete decomposition. calculate the % purity of the sample

Uh..does anyone know how to do this???​

Name the by product produced in chlor alkali process and write two uses of each

. If the reaction of 40.8 grams of C6H6O3 with oxygen produces a 39.0% yield, how many grams of water would be produced?

Explain why XA=1.11 cannot be correct

Plz help me in this​

हीमोग्लोबीन (अणुभार = 67200) में लोहा 0.334% भार से | है। हीमोग्लोबीन के एक अणु में लोहे के कितने परमाणु है :| (1)1 (2)2 (3)3 (4)4​

H c h bond angle in methane is

Molecular solids are a. Crystalline solids b. Amorphous solids c. Ionic solids d. Metallic solids

Shape of C2 h5 molecule​

A shiny brown coloured element 'x' on heating in air becomes black in colour name the element 'x'and the black colour compound formed

Calculate the mass of 2.24litre of so2 gas at STP

Why this compound end with ate ? Diamminesilver(1) dicyanidoargentate(1)

Ch3_(ch3)_ch2_oh iupasc Name

Name the phenomenon which causes one crystal of potassium permanent magnet to turn a beaker of water purple

Calculate the relative molecular masses of the following compounds. A=Glucose C6 H12 O6 B=Sulphuric acid H2 SO4

The ratio of sigma, Pi bonds in CO2 is​

Which of the following is a comproportionation reaction MnO2 a)2KC103 nQ2KC1 + 302 b)3C12 + 6NaOH → 5NaCl + NaClO3 + 3H2O c)CuCl2 + Cu + Cu2Cl2 d)Zn + CuSO4(aq) ZnSO4(aq) + Cu

Write the colour change when universal indiator is added to: i) Water ii) Acetic Acid iii)Caustic Soda iv) HCl

In dilute H2SO4 medium H2O2 reduces MnO4 ion to

An example of alicyclic compound is Benzene Hexane Cyclohexane Furan

Write short note on Iodine deficiency.....​

For the reaction, NH3 + OCI + N2H4 + Cl occurring inbasic medium, the coefficient of N2H4 in thebalanced equation will be​

Tell some indicators and their colour in acidic and bases medium ​give answer fast it's urgent ☺

Write three chemical properties of bases???​

Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is

Translate the following into language of chemistry: Sulphur dioxide reacts with oxygen at 450degree c in the presence of a catalyst (v2o3) to form Sulphur trioxide. The reaction is reversible and 182kj of energy is liberated.​

Which of the following is crude petroleum products?DieselKeroseneNaphthaAll of the above

in joining railway tracks or cracked machine parts reaction of Fe2o3 with aluminium is utilised give reason

Which has is heavier than air (A)hydrogen,(B) oxygen,(C) nitrogen,(D)carbon monoxide

The maximum number of carbon atomsarranged linearly in the molecule,CH3 -C=C-CH=CH2 is

When moist H2S reacts with halogens, thehalogensW

Among the following iso structural perisNE, PEBFS. NESPCI, ICIXeFs, SF

The co-ordination no. of atom's in bcc crystal lattice isa. 2b. 4c. 6d. 8

When calcium carbonate is heated, it decomposes to give___ and _.

Why does our Palm feel cold when we put some petrol or perfume on it? Give correct answer and I'll mark your answer as brainlist answer :)

Explain the mineral acid and organic acids ?

Elements A,B,C,D have atomic numbers 17,8,10,11 respectively.Which is a noble?

Uh..does anyone know how to do this???

Plz help me in this

हीमोग्लोबीन (अणुभार = 67200) में लोहा 0.334% भार से | है। हीमोग्लोबीन के एक अणु में लोहे के कितने परमाणु है :| (1)1 (2)2 (3)3 (4)4

Shape of C2 h5 molecule

The ratio of sigma, Pi bonds in CO2 is

Write short note on Iodine deficiency.....

For the reaction, NH3 + OCI + N2H4 + Cl occurring inbasic medium, the coefficient of N2H4 in thebalanced equation will be

Tell some indicators and their colour in acidic and bases medium give answer fast it's urgent ☺

Write three chemical properties of bases???

Translate the following into language of chemistry: Sulphur dioxide reacts with oxygen at 450degree c in the presence of a catalyst (v2o3) to form Sulphur trioxide. The reaction is reversible and 182kj of energy is liberated.