52639 + Interview Questions in Secondary School in Chemistry

1.	General characteristics of a homologous series
Answer» Features include a general formula and NEIGHBOURING members differing by CH2, with similar chemical PROPERTIES and with a gradation in physical properties. Homologous series are 'families' of organic compounds. They share common characteristics: They all contain the same FUNCTIONAL groupExplanation: HOPE it will help you mark as BRAINLEST answer please

Discussion

2.	Help me please ....
Answer» 3.hso4 and H2SO4 ( h2so4 loses one PROTON to FORM hso4

Discussion

3.	2no + o2 → 2no2+ energy When volume of container is increased equilibrium shifts to: A)left and Kc decreases B) right and Kc increases C)left and Kc remains constant D)right and Kc remains constant
Answer» DExplanation:Kc remains CONSTANT SINCE the temperature remain unchanged, and since the volume increases, the pressure decreases, it will shift to RIGHT side to compensate the decrease in pressure. Right side has a lower pressure than left side as there is only a mole of gas, but left side has TWO mole of gases, they will collide more, and the pressure is relatively higher.

Discussion

4.	For the reaction R --->P, the rate becomes 4 times faster when the concentration of the reactant R is doubled at a given temparature. What is the order of the reaction?
Answer» re some short tricks in the 2ND pic. plz REFER to it for understanding the 1st pic.For more clarity and understanding I request you to watch the video of this particular topic uploaded by MELISSA MARIBEL in youtube I hope it HELPS U my frnd

Discussion

5.	The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is very
Answer» W ,if the no.of H+ ions is GREATER than the PH is less than 7.so the ANS is low.hope it will u☺️°°Mark me as a brainlist°°

Discussion

6.	Define liquefaction.
Answer» the PROCESS of MAKING something, ESPECIALLY a GAS, liquid.

Discussion

7.	What is meant by catenation??
Answer» ion is the BINDING of an ELEMENTS to it self through covalent bonds from chain (or) ring MOLECULES is KNOWN as catenationplease Mark brain list answer please please please please please please

Discussion

8.	Define double displacement reactions . give example
Answer» here is your ANSWER buddyDouble displacement reactions may be defined as the chemical reactions in which ONE component each of both the REACTING molecules is exchanged to FORM the products. During this reaction, the cations and anions of two different compounds switch places, forming two entirely different compoundsExplanation:please MARK me as brilliant please✌✌✌✌

Discussion

9.	Why is the solution of bleaching powder milky?
Answer» When bleaching POWDER is mixed in water to FORM calcium hydroxide (a calcium salt) and HOCl acid. Here HOCl is an unstable acid which further RELEASE chlorine gas. Here milky appearance is due to calcium hydroxide. The chlorine gas acts as bleaching ACTION and bleach the substance present in it

Discussion

10.	What will be the fraction of molecules having energy equal to or greater than activation energy, Ea? (a) K (b) A (c) Ae-Ea/Rt (d) e-Ea/Rt
Answer» n : What will be the fraction of MOLECULES having energy EQUAL to or GREATER than activation energy, ? (a) K(b) A (c) (d) solution : according to Arrhenius equation, where represents fraction of molecules having energy equal to or greater than activation energy, .Therefore the correct option is (D) .also read similar questions : The Rate of a fraction becomes double with every 10°Rise in temperature . If this equation HOLDS for [298-308K] , what w... brainly.in/question/10576281Why EA of fluorine is less than that of chlorine? brainly.in/question/3988665

Discussion

11.	In the formation of S02 by contact process; 2SO2 + O2 → 2SO3, the rate of reaction was measured as at. The rate of formation of of S03 will be (a) -5.0 × 10-4 mol L-1s-1 (b) -1.25 × 10-4 mol L-1s-1 (c) 3.75 × 10-4 mol L-1s-1 (d) 5.00 × 10-4 mol L-1s-1
Answer» PLEASE FOLLOW me MATE and MARK me as BRAIN leist

Discussion

12.	The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is (a) 12.1 h (b) 9.7 h (c) 11.3 h (d) 1.8 h
Answer» b is the correct ANSWEREXPLANATION:HOPE it's help you THANK you

Discussion

13.	The rate of a certain hypothetical reaction A + B + C → products is given by r = . The order of reaction is (a) 13/11 (b) 13/14 (c) 12/13 (d) 13/12
Answer» d is the CORRECT ANSWEREXPLANATION:HOPE it's HELP you THANK you

Discussion

14.	In the first order reaction the concentration of reactant decreases from 0.6 M to 0.3 M in 30 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M: (a) 60 min (b) 30 min (c) 15 min (d) 50 min
Answer» C is the correct answerExplanation:hope it's HELP you THANK you

Discussion

15.	A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion? [NCERT Exemplar] (a) 1.26 × 1015 s (b) 2.52 × 1014 s (c) 2.52 × 1028 s (d) infinite
Answer» C is the CORRECT ANSWER

Discussion

16.	Consider the Arrhenius equation given below and mark the correct option. [NCERT Exemplar] (a) Rate constant increases exponentially with increasing activation energy and decreasing temperature. (b) Rate constant decreases exponentially with increasing activation energy and decreasing temperature. (c) Rate constant increases exponentially with decreasing activation energy and decreasing temperature. (d) Rate constant increases exponentially with decreasing activation energy and increasing temperature."
Answer» a is the CORRECT ANSWEREXPLANATION:HOPE it's HELP you THANK you

Discussion

17.	What type of reaction is this? (a) Second order (b) Unimolecular (c) Pseudo-unimolecular (d) Third order"
Answer» i DONOT UNDERSTAND this ONE

Discussion

18.	If cone, of reactant ‘A’ is increased 10 times and rate of reaction becomes 100 times. What is order with respect to ‘A’? (a) 1 (b) 1 (c) 3 (d) 4
Answer» ANSWER is a 1 .. 200 chake to you answer

Discussion

19.	Tabulate the differences in the characterstics of state of matter
Answer» 360.comGET APPHome / (a) Tabulate the differences in the characterisitcs of states of matter.Q 2. (a) Tabulate the differences in the characteristics of states of matter.Answers (1)M manishAnswered 10 months, 2 weeks agoThe DIFFERENCE in the characteristics of three states of matter-(i) Shape- Solid has fixed formliquid has no fixed shapegas has no fixed shape (ii) Volume-Solid has fixed volumethe fluid has fixed volumegas has no fixed volume(iii) Rigidity/fluidity-Solids are rigid and cannot flowfluid can flow and have no any rigiditygas can flow and have no rigidity(IV) Intermolecular force and space-Solids have a high intermolecular force and less spaceliquid has an intermediate intermolecular force and has space more than solidsGas has a very less intermolecular force and has high space Hope U likeMark it as brainliest MAN

Discussion

20.	For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is (a) Two (b) One (c) Half (d) Zero
Answer» ANSWER is a no B not a C d OK

Discussion

21.	Activation energy of a chemical reaction can be determined by __________ . [NCERT Exemplar] (a) determining the rate constant at standard temperature. (b) determining the rate constants at two temperatures. (c) determining probability of collision. (d) using catalyst.
Answer» I KNOW for your QUESTION

Discussion

22.	Consider Fig. and mark the correct option. [NCERT Exemplar] (а) Activation energy of forward read ion is E1 + E2 and product is less stable than reactant. (b) Activation energy of forward reaction is E1 + E2 and product is more stable than reactant. (c) Activation energy of both forward and backward reaction is E1 + E2 and reactant is more stable than product. (d) Activation energy of backward reaction is E1 and product is more stable than reactant.
Answer» B is the correct ANSWEREXPLANATION:hope it's HELP you thank you

Discussion

23.	If critical temperature of a gas is 160k then its boyles temperature will be
Answer» The CRITICAL temperature of gas is that temperature above which is cannot be liquified by pressure. For example:-the critical temperature of Carbon DIOXIDE gas is 30.98 ° C............Tc=8/27 TbTb= 160×27/8=540KTb means boyle temperature and Tc means temperature...........I hope it will help you and OTHERS....Mark me brainleist please please pleaseStay SAFE and keep smiling.....THANKS!!!

Discussion

24.	Why do wet clothes dry quickly in the sun than in the shade.
Answer» It happens beacuse: The rate of evaporation increases:- when the surface area increases, the rate of evaporation increases because the clothes GET the maximum HEAT of the sunan increase in temperature , because as the temperature increases the heat evaporates the water more quickly a DECREASE in humidity, because if their would be high amonunt of humidity so the NEW condensed water VAPOURS will not get place to stop an increase in wind speed, because as the wind speed increases the rate of evaporation increases

Discussion

25.	The Density of Metal is 7.56 g/cm³. Change the SI Unit into kg/m³
Answer» DENSITY of METAL = 7.56 g/cm³⠀⠀⠀⠀⠀⠀Conversion Table

Discussion

26.	What is motion how can we describe
Answer» In physics, motion is the phenomenon in which an OBJECT CHANGES its POSITION over time. Motion is mathematically described in terms of DISPLACEMENT, distance, VELOCITY, acceleration, speed, and time.

Discussion

27.	Pdf for cbse class 12 comprehensive chemistry
Answer» arey dude PDF YHA pr kaise SEND KRU...?

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28.	Please solving this problem okkkkkkkkkk
Answer» I don't KNOW because I am READ in CLASS 6.

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29.	Plzz solve this problem
Answer» x=10 is the answer for your QUESTION OK FOLLOW me please mark my answer as BRAINLEST answer THANK me OK

Discussion

30.	For the reaction R-->P, write the differential rate law.
Answer» d[P]/dt=k[R]^nIt is diff RATE law.

Discussion

31.	If the initial concentration of reactant is doubled, t1/2 is also doubled, the order of reaction is (a) zero (b) 1 (c) 2 (d) 3
Answer» zeroExplanation:Since the only reaction WHOSE half-life doubles when the concentration of a REACTANT is doubled is the ZERO order reaction, your reaction must be zero order.n plz mark it brainliest

Discussion

32.	The activation energy of a reaction can be determined from the slope of which of the following graph:
Answer» henius EQUATION is lnk=lnA−RTEa. Thus, the activation ENERGY of a REACTION can be determined from the slope of which of the graph ln K vs. ☺️❤️

Discussion

33.	Mechanism of a hypothetical reaction X2 + Y2 → 2 × Y is given below: (b) X + Y2 → XY + Y (slow) (c) X + Y → XY (fast) The overall order of reaction is (a) 2 (b) 0 (c) 1.5 (d) 1"
Answer» tion:CHEMISTRYMechanism of a HYPOTHETICAL reaction X 2 +Y 2 →2XY is given below:(i) X 2 ⇌X+X(FAST)(ii) X+Y 2 →XY+Y(SLOW)(iii) X+Y→XY(fast)The overall order of the reaction will be:October 15, 2019avatarPremlata SrinivasSHAREVIDEO EXPLANATIONANSWERTake reaction (i) and (iii) to be equilibrium reaction where value of k f >>>k b Therefore, [X 2 ][X] 2 =K E′ ∴[X]=K e′ 0.5 ×[X 2 ] 0.5 −(A)Since reaction (ii) is the slowest step, so the rate of this reaction will be reaction rate for the main reaction.∴r=K e [X][Y 2 ] −(B)Substituting EQUATION (A) in equation (B)We get r=K e ×K e′ 0.5 [X 2 ] 0.5 [Y 2 ]Let K e ×K e′ =K∴r=K[X 2 ] 0.5 [Y 2 ]Hence, order of reaction is 1+0.5=1. v. please mark it brainliest

Discussion

34.	The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months? (a) 0.36 M (b) 0.72 M (c) 1.08 M (d) 3.60 M
Answer» ER Answer:(b) 0.72 MExplanation:Reaction's order will be zero and RATE constant's unit is MOLE per second.K = [ A ]0 - [ A ] / t0.6 × 10 ^–3 = 5 - [ A ] / 20 X 60[ A ] = 5 - 0.72Conc. of B after 20 MINUTES will be 0.72 M.

Discussion

35.	Why does alkaline medium inhibit rusting of iron?
Answer» RUSTING of IRON is due to the presence of H+ ions. ALKALINE MEDIUM reduces the concentration of H+ ions by increasing the concentration of OH- ions. (It will neutralize H+ ions) and inhibit rusting.

Discussion

36.	Which of the following is affected by catalyst? (a) ∆H (b) ∆S (c) ∆G (d) Ea
Answer» Recall that catalysts are COMPOUNDS that accelerate the progress of a reaction without being CONSUMED. Common examples of catalysts INCLUDE acid catalysts and enzymes. Catalysts allow reactions to proceed faster through a lower-energy transition state. By lowering the energy of the transition state, which is the rate-limiting step, catalysts reduce the required energy of ACTIVATION to allow a reaction to proceed and, in the case of a reversible reaction, reach equilibrium more rapidly.CatalysisA catalyst SPEEDS up a reaction by lowering the activation energy required for the reaction to proceed.Explanation:D)Ea

Discussion

37.	What is the value of potential of SHE?
Answer» A Standard Hydrogen Electrode (SHE) is an electrode that SCIENTISTS use for reference on all half-cell potential REACTIONS. The value of the standard electrode potential is zero, which FORMS the basis one needs to calculate cell potentials using different electrodes or different concentrations.Explanation:Mark as brainly please.

Discussion

38.	3. A solution is prepared by dissolving 3.65g of HCl in 500ml of the solution .Calculate the molarity of the solution. Determine the volume of this solution required to prepare250ml of 0.001M solution.
Answer» 1)molarity=0.2M2)VOLUME=1.25mlExplanation:1)GIVEN,Volume V=500mlWeight W=3.65gMolecular Mass M=1+35.5=36.5gm/molMolarity S=?Then,W=(SVM)/1000Or,S=W×1000/V×MOr,S=3.65×1000/500×36.5Therefore,Molarity S=0.2M2)LET,S1=0.2M V2=250ml S2=0.001MV1=?Now,V1S1=V2S2or,V1=250×0.001/0.2Therefore,V1=1.25ml.

Discussion

39.	The rate of first order reaction is 0.04 mol L-1 s-1 at 10 sec. and 0.03 mol L-1 at 2C seconds after initiation of the reaction. t1/2 of reaction is (a) 44.1 s (b) 54.1 s (c) 24.1 s (d) 34.1 s
Answer» B) 54.1shope it may be you please MARK me as a brainliest please mark me and follow me

Discussion

40.	A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g? (a) 138.6 s (b) 346.5 s (c) 693.0 s (d) 238.6 s
Answer» 138.6shope it MAY be you PLEASE MARK me as a BRAINLIEST please mark me and FOLLOW me

Discussion

41.	The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is (a) 0.5 × 10-2 s-1 (b) 0.5 × 10-3 s-1 (c) 5.0 × 10-2 s-1 (d) 5.0 × 10-3 s-1
Answer» 0.5×10-3s-1hope it MAY be you PLEASE MARK me as a BRAINLIEST please mark me and FOLLOW me

Discussion

42.	Which electrolyte is used in fuel cell?
Answer» Potassium HYDROXIDE:-Alkali fuel cells operate on compressed hydrogen and OXYGEN. They generally use a solution of potassium hydroxide (chemically, KOH) in water as their electrolyte. Efficiency is about 70 percent, and operating temperature is 150 to 200 degrees C, (about 300 to 400 degrees F).Explanation:Mark as brainly PLEASE.

Discussion

43.	Download latest edition of chemistry ncert class 12
Answer» GO to the NCERT OFFICIAL WEBSITE and DOWNLOAD it from there

Discussion

44.	What is the valency of Mn(not oxidation number) in MnO4-?
Answer» e!!here is UR ans..in above picture........MAY it will HELP u✅✅✔✔

Discussion

45.	Which of these is made from fabric option 1 socks option B code option C cardigan
Answer» OPTION a socksis it RIGHT

Discussion

46.	Please explain (answer is 39.58)Pls don't spam....Spams will be reported and points will be withdrawn.Help me if you know the detailed explanation....
Answer» TURE is T=65 0 C=65+273=338Kdensity is d=1.56g/L P= MdRT where M is MOLECULAR wt.⟹M= PdRT ⟹M= 0.981.56×338×0.0821 =44.2uHence, the molecular MASS of the gas is 44.2u.IT MAY HELP YOU

Discussion

47.	From the chapter -atomic structure ______________________why the electric / mass ratio of a proton is maximum when hydrogen is taken in a discharging tube??
Answer» because hydrogen has a very less MASS in COMPARISON to other elements... less the mass more is the RATIO!!!

Discussion

48.	What are the factors which depend on the products of electrolysis?
Answer» The products of ELECTROLYSIS DEPEND on standard electrode potentials of the different oxidizing and reducing SPECIES present in the electrolytic cell. In case of multiple reactions, product of electrolysis DEPENDS on the standard electrode potential of various reactions taking placeplease mark me as BRAINLIST answer please please please please requesting

Discussion

49.	What mass of zinc (II) ion will be reduced by 1 mole of electrons?
Answer» 2-mole electrons NEEDED to reduce 1 mole of Zinc.0.5 mole Zinc will be REDUCED by 1 mole of electrons.Mass = 65.39 * 0.5= 32.69gMark me as brainliest☺

Discussion

50.	How many Faradays of charge are required to convert: 1 mole of MnO4–" to Mn2+ ion,
Answer» TION:MEANS I'm DE J ejoa no of

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

General characteristics of a homologous series

Help me please ....

2no + o2 → 2no2+ energy When volume of container is increased equilibrium shifts to: A)left and Kc decreases B) right and Kc increases C)left and Kc remains constant D)right and Kc remains constant

For the reaction R --->P, the rate becomes 4 times faster when the concentration of the reactant R is doubled at a given temparature. What is the order of the reaction? ​

The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is very​

Define liquefaction. ​

What is meant by catenation?? ​

Define double displacement reactions . give example​

Why is the solution of bleaching powder milky?​

What will be the fraction of molecules having energy equal to or greater than activation energy, Ea? (a) K (b) A (c) Ae-Ea/Rt (d) e-Ea/Rt

In the formation of S02 by contact process; 2SO2 + O2 → 2SO3, the rate of reaction was measured as at. The rate of formation of of S03 will be (a) -5.0 × 10-4 mol L-1s-1 (b) -1.25 × 10-4 mol L-1s-1 (c) 3.75 × 10-4 mol L-1s-1 (d) 5.00 × 10-4 mol L-1s-1

The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is (a) 12.1 h (b) 9.7 h (c) 11.3 h (d) 1.8 h

The rate of a certain hypothetical reaction A + B + C → products is given by r = . The order of reaction is (a) 13/11 (b) 13/14 (c) 12/13 (d) 13/12

In the first order reaction the concentration of reactant decreases from 0.6 M to 0.3 M in 30 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M: (a) 60 min (b) 30 min (c) 15 min (d) 50 min

A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion? [NCERT Exemplar] (a) 1.26 × 1015 s (b) 2.52 × 1014 s (c) 2.52 × 1028 s (d) infinite

What type of reaction is this? (a) Second order (b) Unimolecular (c) Pseudo-unimolecular (d) Third order"

If cone, of reactant ‘A’ is increased 10 times and rate of reaction becomes 100 times. What is order with respect to ‘A’? (a) 1 (b) 1 (c) 3 (d) 4

Tabulate the differences in the characterstics of state of matter

For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is (a) Two (b) One (c) Half (d) Zero

Activation energy of a chemical reaction can be determined by __________ . [NCERT Exemplar] (a) determining the rate constant at standard temperature. (b) determining the rate constants at two temperatures. (c) determining probability of collision. (d) using catalyst.

If critical temperature of a gas is 160k then its boyles temperature will be

Why do wet clothes dry quickly in the sun than in the shade.

The Density of Metal is 7.56 g/cm³. Change the SI Unit into kg/m³​

What is motion how can we describe​

Pdf for cbse class 12 comprehensive chemistry​

Please solving this problem okkkkkkkkkk​

Plzz solve this problem​

For the reaction R-->P, write the differential rate law.​

If the initial concentration of reactant is doubled, t1/2 is also doubled, the order of reaction is (a) zero (b) 1 (c) 2 (d) 3

The activation energy of a reaction can be determined from the slope of which of the following graph:

Mechanism of a hypothetical reaction X2 + Y2 → 2 × Y is given below: (b) X + Y2 → XY + Y (slow) (c) X + Y → XY (fast) The overall order of reaction is (a) 2 (b) 0 (c) 1.5 (d) 1"

The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months? (a) 0.36 M (b) 0.72 M (c) 1.08 M (d) 3.60 M

Why does alkaline medium inhibit rusting of iron?

Which of the following is affected by catalyst? (a) ∆H (b) ∆S (c) ∆G (d) Ea

What is the value of potential of SHE?

3. A solution is prepared by dissolving 3.65g of HCl in 500ml of the solution .Calculate the molarity of the solution. Determine the volume of this solution required to prepare250ml of 0.001M solution.

The rate of first order reaction is 0.04 mol L-1 s-1 at 10 sec. and 0.03 mol L-1 at 2C seconds after initiation of the reaction. t1/2 of reaction is (a) 44.1 s (b) 54.1 s (c) 24.1 s (d) 34.1 s

A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g? (a) 138.6 s (b) 346.5 s (c) 693.0 s (d) 238.6 s

The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is (a) 0.5 × 10-2 s-1 (b) 0.5 × 10-3 s-1 (c) 5.0 × 10-2 s-1 (d) 5.0 × 10-3 s-1

Which electrolyte is used in fuel cell?

Download latest edition of chemistry ncert class 12​

What is the valency of Mn(not oxidation number) in MnO4-?

Which of these is made from fabric option 1 socks option B code option C cardigan​

Please explain (answer is 39.58)Pls don't spam....Spams will be reported and points will be withdrawn.Help me if you know the detailed explanation....​

From the chapter -atomic structure ______________________why the electric / mass ratio of a proton is maximum when hydrogen is taken in a discharging tube??​

What are the factors which depend on the products of electrolysis?

What mass of zinc (II) ion will be reduced by 1 mole of electrons?

How many Faradays of charge are required to convert: 1 mole of MnO4–" to Mn2+ ion,

For the reaction R --->P, the rate becomes 4 times faster when the concentration of the reactant R is doubled at a given temparature. What is the order of the reaction?

The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is very

Define liquefaction.

What is meant by catenation??

Define double displacement reactions . give example

Why is the solution of bleaching powder milky?

The Density of Metal is 7.56 g/cm³. Change the SI Unit into kg/m³

What is motion how can we describe

Pdf for cbse class 12 comprehensive chemistry

Please solving this problem okkkkkkkkkk

Plzz solve this problem

For the reaction R-->P, write the differential rate law.

Download latest edition of chemistry ncert class 12

Which of these is made from fabric option 1 socks option B code option C cardigan

Please explain (answer is 39.58)Pls don't spam....Spams will be reported and points will be withdrawn.Help me if you know the detailed explanation....

From the chapter -atomic structure ______________________why the electric / mass ratio of a proton is maximum when hydrogen is taken in a discharging tube??