52639 + Interview Questions in Secondary School in Chemistry

1.	An element e has a valency 3. Write the formula for its bromide oxide carbonate nitrite
Answer» They are ASKING to WRITE formula with BROMIDE ETC .. so E is a cation..

Discussion

2.	Without using column chromatography, how will you separate a mixture of camphor andbenzoic acid?
Answer» By sublimation. As we heat the mixture camphor will change into VAPOUR as it is SUBLIME in nature. This we will GET BENZOIC acid separated from camphor. Be brainly

2.

Without using column chromatography, how will you separate a mixture of camphor andbenzoic acid?

Answer»

By sublimation. As we heat the mixture camphor will change into VAPOUR as it is SUBLIME in nature. This we will GET BENZOIC acid separated from camphor.

Be brainly

Discussion

3.	Is it possible to see atoms these day
Answer» I THINK it's POSSIBLE.

Discussion

4.	Give some information about PH.
Answer» Hey FRIEND, Here is your answer - PH means power of hydrogen. By the help of ph scale we can measure hydrogen ion concentration in the SOLUTION. ph is the number which indicates acidic or basic NATURE of solution. If the ph value is between 0 to 7 ,the solution is acidic. If the ph value is between 7 to 14 the solution is basic or alkaline. If the ph value is equal to 7 the solution is neutral. Hope it will help you friend. Make me brainliest please....

Discussion

5.	When concentrated acid is added to water then which process is exothermic or endothermic?
Answer» When we ADD conc.acid to water energy is RELEASED i.e. the energy ABSORBED due to its dissociation is less than the energy released due to hydration of resultant ions.So it is exothermic process.

Discussion

6.	BALANCE TEN CHEMICAL EQUATION WITH PHYSICAL STATES
Answer» Hay mate here is their answer 1. CaCo3 (s) +2HCl (aq) __________ CACL2(AA) +H20+Co2 2. 2Na+2H2O _______2NaoH+H2 3.BaCl2 +H2SO4 _____ BaSO4 + HCl 4.CO2+2H2O ______ CH3OH 5. 6CO2 +12H2O ______C6H12O6 + 6O2 + 6H2O 6.N2+3H2____2NH3 7. C+O2______ CO2 8. N2 + O2 _____2NO 9. N2O4 ____2NO2 it is forward and BACKWARD reaction 10. 3Fe+4H2O _______Fe3O4 +4H2O I hope it help you plzz mark me brainiest plzz

Discussion

7.	Write chemical formula of washing soda how is it obtain from baking soda name one industrial use of washing soda
Answer» Na2CO3 is the CHEMICAL formula of washing soda. When baking soda is heated, sodium carbonate, WATER and CO2 are produced. Sodium carbonate obtained is dissolved in water and crystals of washing soda are obtained by crystallization. It is used in the manufacture of glass, paper and detergents.. hope DIS HELPS uh..

Discussion

8.	Q. Hydrogen peroxide , H2O2(aq) decomposes to H2O (l) and O2 (g) in a reaction that is first order in H2O2and has a rate constant k= 1.06 X 10-3 min -1.(i) How long it will take 15 % of a sample of H2O2 to decompose ?(ii) How long it will take 85 % of a sample to decompose ?
Answer» ANSWER:i) 2.55 hours of time require to DECOMPOSE 15% of hydrogen peroxide sample. ii)29.83 hours of time require to decompose 85% of hydrogen peroxide sample. Explanation: The integrated expression of FIRST order reaction: $kt=2.303\log\frac{[A_o]}{[A]}$ [/tex] k = rate constant, [A] = concentration of sample at time t. $[A_o]$ = initial concentration $H_2O_2$ i) time taken 15 % of a sample of to decompose: $[A]=A_o-15\%[A_o]=0.85[A_o]$ $1.06\times 10^{-3} min^{-1}t=2.303\log\frac{[A_o]}{[0.85A_o]}$ $t_{15\%}=153.34 min=2.55 hours(1 hour=60 min)$ $H_2O_2$ ii) time taken 85 % of a sample of to decompose: $[A]=A_o-85\%[A_o]=0.15[A_o]$ $1.06\times 10^{-3} min^{-1}t=2.303\log\frac{[A_o]}{[0.15A_o]}$ $t_{15\%}=1790 min=29.83 hours$

8.

Q. Hydrogen peroxide , H2O2(aq) decomposes to H2O (l) and O2 (g) in a reaction that is first order in H2O2and has a rate constant k= 1.06 X 10-3 min -1.(i) How long it will take 15 % of a sample of H2O2 to decompose ?(ii) How long it will take 85 % of a sample to decompose ?

Answer»

ANSWER:i) 2.55 hours of time require to DECOMPOSE 15% of hydrogen peroxide sample.

ii)29.83 hours of time require to decompose 85% of hydrogen peroxide sample.

Explanation:

The integrated expression of FIRST order reaction:

$kt=2.303\log\frac{[A_o]}{[A]}$ [/tex]

k = rate constant, [A] = concentration of sample at time t.

$[A_o]$ = initial concentration

$H_2O_2$ i) time taken 15 % of a sample of to decompose:

$[A]=A_o-15\%[A_o]=0.85[A_o]$

$1.06\times 10^{-3} min^{-1}t=2.303\log\frac{[A_o]}{[0.85A_o]}$

$t_{15\%}=153.34 min=2.55 hours(1 hour=60 min)$

$H_2O_2$ ii) time taken 85 % of a sample of to decompose:

$[A]=A_o-85\%[A_o]=0.15[A_o]$

$1.06\times 10^{-3} min^{-1}t=2.303\log\frac{[A_o]}{[0.15A_o]}$

$t_{15\%}=1790 min=29.83 hours$

Discussion

9.	the equilibrium constant for 2h2s = 2H2 + S2 is 0.0118 at 1300k while the heat of dissociation is 597.4kj. the standard equilibrium constant of the reaction is
Answer» The equillbrium constant for, 2H2S(g) ----> 2H2(g) + S2(g) is 0.0118 at 1300 K while the HEAT of dissociation is 597.4 KJ. The standard EQUILLIBRIUM constant for the reaction at 1200 K is :-1.80 x 10-4

Discussion

10.	Two separate bulbs contain ideal gases A and B . The density of A is twice as that of gas B . The molecular mass of gas A is half as that of B . If two gases are at same temperature , the ratio of the pressure of A to that of B is ?
Answer» The Equation for an IDEAL GAS is PV =nRT The Temperature is KEPT constant and R is a constant , So PV ∝ n ⇒PV∝ w/M ⇒P ∝ w/MV ⇒P ∝ d/M (as w/V =density =d) ⇒P= kd/M (where k is a constant) So ,, $P_A/P_B = \frac{kd_A/M_A}{kd_B/M_B}\\ P_A/P_B =d_AM_B/d_BM_A\\P_A/P_B=\frac{(2d_B)(M_B)}{d_B(M_A/2)} \\P_A/P_B=4$

10.

Two separate bulbs contain ideal gases A and B . The density of A is twice as that of gas B . The molecular mass of gas A is half as that of B . If two gases are at same temperature , the ratio of the pressure of A to that of B is ?

Answer»

The Equation for an IDEAL GAS is

PV =nRT

The Temperature is KEPT constant and R is a constant ,

So

PV ∝ n

⇒PV∝ w/M

⇒P ∝ w/MV

⇒P ∝ d/M (as w/V =density =d)

⇒P= kd/M (where k is a constant)

So ,,

$P_A/P_B = \frac{kd_A/M_A}{kd_B/M_B}\\ P_A/P_B =d_AM_B/d_BM_A\\P_A/P_B=\frac{(2d_B)(M_B)}{d_B(M_A/2)} \\P_A/P_B=4$

Discussion

11.	Give three examples to show that hydrogen is a reducing agent
Answer» 2H2 + O2 = 2H2O H2 + CL2= 2HCl hydrogen gas ACTS as an oxidizing agent when it combines with metals and as a reducing agent when it REACTS with nonmetals.

11.

Give three examples to show that hydrogen is a reducing agent

Answer»

2H2 + O2 = 2H2O

H2 + CL2= 2HCl

hydrogen gas ACTS as an oxidizing agent when it combines with metals and as a reducing agent when it REACTS with nonmetals.

Discussion

12.	N2O4=2NO2 the observed molecular weight of N2O4 IS 80g/mol at 350K the percentage of dissociation of N2O4 at 350 K is
Answer» $N_2O_5$ Answer: PERCENTAGE dissociation of for the given reaction is 15%. Explanation: We are given a chemical equation: $N_2O_4\rightleftharpoons 2NO_2$ at t = 0 1 0 at $t=t_{eq}$ $1-\alpha$ $2\alpha$ Van't Hoff factor for dissociation is given by: $i=\frac{\text{Normal Molecular <klux>MASS</klux>}}{\text{Observed Molecular mass}}$ For Association, i < 1 For dissociation, i > 1 Normal molecular mass of $N_2O_5$ = 92 g/mol Observed molecular mass of $N_2O_5$ = 80 g/mol Putting values in above equation, we get: $i=\frac{92}{80}=1.15$ Expression for Van't Hoff equation is given by: $i=\frac{\text{Observed colligative property}}{\text{Calculated colligative property}}$ $i=\frac{1-\alpha +2\alpha }{1}$ $i=\frac{1+\alpha }{1}$ where, i = Van't Hoff factor $\alpha$ = Degree of dissociation or association. $1.15=1-\alpha \\\alpha = 0.15$ $N_2O_4$ Percentage of dissociation for is given by: $\text{Percentage dissociation of }N_2O_4=\alpha \times 100$ $\text{Percentage dissociation of }N_2O_4=0.15\times 100=15\%$

12.

N2O4=2NO2 the observed molecular weight of N2O4 IS 80g/mol at 350K the percentage of dissociation of N2O4 at 350 K is

Answer»

$N_2O_5$ Answer: PERCENTAGE dissociation of for the given reaction is 15%.

Explanation: We are given a chemical equation:

$N_2O_4\rightleftharpoons 2NO_2$

at t = 0 1 0

at $t=t_{eq}$ $1-\alpha$ $2\alpha$

Van't Hoff factor for dissociation is given by:

$i=\frac{\text{Normal Molecular <klux>MASS</klux>}}{\text{Observed Molecular mass}}$

For Association, i < 1

For dissociation, i > 1

Normal molecular mass of $N_2O_5$ = 92 g/mol

Observed molecular mass of $N_2O_5$ = 80 g/mol

Putting values in above equation, we get:

$i=\frac{92}{80}=1.15$

Expression for Van't Hoff equation is given by:

$i=\frac{\text{Observed colligative property}}{\text{Calculated colligative property}}$

$i=\frac{1-\alpha +2\alpha }{1}$

$i=\frac{1+\alpha }{1}$

where,

i = Van't Hoff factor

$\alpha$ = Degree of dissociation or association.

$1.15=1-\alpha \\\alpha = 0.15$

$N_2O_4$ Percentage of dissociation for is given by:

$\text{Percentage dissociation of }N_2O_4=\alpha \times 100$

$\text{Percentage dissociation of }N_2O_4=0.15\times 100=15\%$

Discussion

13.	the experimental value for the molar mass of non volatile solute is twice the theoretical value what is the van't hoff factor for solute
Answer» Van’t Hoff factor (i) = 2. The Van’t Hoff factor is a quantity described as the ratio between experimental and THEORETICAL colligative properties. These properties are based on the number of particles, in this case - solute, that are FOUND in a particular mixture. According to the question, experimental mass is twice the theoretical mass. Hence, their ration will be. When i = 2, it is dissociative in nature, that is, the original molecule SPLITS into two substituent molecules on dissolving in WATER.

13.

the experimental value for the molar mass of non volatile solute is twice the theoretical value what is the van't hoff factor for solute

Answer»

Van’t Hoff factor (i) = 2.

The Van’t Hoff factor is a quantity described as the ratio between experimental and THEORETICAL colligative properties. These properties are based on the number of particles, in this case - solute, that are FOUND in a particular mixture.

According to the question, experimental mass is twice the theoretical mass. Hence, their ration will be. When i = 2, it is dissociative in nature, that is, the original molecule SPLITS into two substituent molecules on dissolving in WATER.

Discussion

14.	How many structural isomers possible for bromopentane? Draw structure also.
Answer» Here is your ANSWER HOPE this HELPS you Please MARK it as brainliest

14.

How many structural isomers possible for bromopentane? Draw structure also.

Answer»

Here is your ANSWER

HOPE this HELPS you

Please MARK it as brainliest

Discussion

15.	Convert benzaldehyde to benzyl alcohol in precence of aqueos naoh
Answer» This reaction is known as CANNIZZARO RACTION. this reaction gives ALCOHOL on reduction and salt of a CARBOXYLIC acid on oxidation. When Benzaldehyde treated NaOH it gives Benzoyl alcohol[REDUCED] and SODIUM benzoate[oxidised].

15.

Convert benzaldehyde to benzyl alcohol in precence of aqueos naoh

Answer»

This reaction is known as CANNIZZARO RACTION. this reaction gives ALCOHOL on reduction and salt of a CARBOXYLIC acid on oxidation.

When Benzaldehyde treated NaOH it gives Benzoyl alcohol[REDUCED] and SODIUM benzoate[oxidised].

Discussion

16.	Chalk contains 3 % carbon 10% calcium 12% oxygen find the amount in gms of these substances in 1 kg
Answer» Carbon =3% calcium = 10% OXYGEN= 12% total amount = 1kg= 1000 grams carbon=3/100x1000=30grams calcium=10/100x1000=100grams oxygen= 12/100x1000=120grams

Discussion

17.	A gas occupies 70 litres at 27oC.What volume will it occupy at 273oC, pressure remaining constant?
Answer» A gas occupies 70 litres at 27°C , What VOLUME will it occupy at 273 °C , pressure remaining constant. Solution: We have, => Pv = nRT => V = T => V1 / V2 = T1 / T2 => 70 / V2 = 27 / 273 => V2 = 70 × 273 / 73 => 261.78 LITRE Hence, The Required volume is 261.78 litre.

Discussion

18.	Iupac nomenclature for alkanes alkanes and alkynes
Answer» HOPE it HEPL U..,....,..........

Discussion

19.	Write the number of covlaent bonds in the molecule of propaneC3H8
Answer» The NUMBER of COVALENT BOND is 10

Discussion

20.	What os the colour of a solution formed on dipping apiecw of zinc in dill sulphuric acida. colourlessb. turn redc. blackd. red
Answer» Hii There!!! ✔️Correct option is a) The solution which would be obtained after dipping zinc in dilute solution of Sulphuric ACID will be colourless. Reason for this is that both Metal and acid are in its PURE state it will lead to displacement reaction. Here is the chemical reaction TAKING place : Zn + H2SO4 ------> ZnSO4 + H2 _____________________ # ¢'$ # Hope it HELPS

Discussion

21.	How many amines are possible with molecular formula c4h11n only structural isomers?
Answer» I THINK it's 8 n-butyl AMINE sec-butyl amine INCLUDING 2 optical isomers isobutyl amine tert-butyl amine 2. Secondary amines N-methyl n-propyl amine N-methyl ISOPROPYL amine N, N-diethyl amine 3. Tertiary amine N-ethyl N, N-dimethyl amine

21.

How many amines are possible with molecular formula c4h11n only structural isomers?

Answer»

I THINK it's 8

n-butyl AMINE

sec-butyl amine INCLUDING 2 optical isomers

isobutyl amine

tert-butyl amine

2. Secondary amines

N-methyl n-propyl amine

N-methyl ISOPROPYL amine

N, N-diethyl amine

3. Tertiary amine

N-ethyl N, N-dimethyl amine

Discussion

22.	.......is the highest grade, while...... is the lowest grade coal1) Bituminous 2) Peat 3) Lignite 4) Anthracite
Answer» Peat-is.the LOWEST and ANTHRACITE is HIGHEST GRADE of COAL

Discussion

23.	Word equation of Co+O2=CO2
Answer» carbon+oxygen=carbon DIOXIDE

Discussion

24.	02 n2 cl2 increasing order of number of covalent bonds
Answer» N2 3 bonds O2 2 bonds and Cl2 only 1 covalent BOND......

Discussion

25.	Explain the structure of cyclohexene and cyclohexane
Answer» CYCLOHEXANE is a HYDRA carbon with formula C6H12 WHEREAS CYCLOHEXENE is a hydrocarbon with formula C6H10.

Discussion

26.	Which gas is evolved during respiration in plants
Answer» In PLANTS, OXYGEN gas is evolved during photosynthesis and carbon DIOXIDE gas is evolved during RESPIRATION

Discussion

27.	Calcium acetate and calcium formate on dry distillation gives
Answer» Hey MATE ^_^ DRY DISTILLATION of calcium acetate and calcium FORMATE leads to the FORMATION of ....aldehydes and ....ketones.

Discussion

28.	ph of resultant solution formed by mixing of equal volumes of two solutions having ph 5.8 and ph 12.8
Answer» First of all, we have to find out CONCENTRATION of hydrogen ions in both solutions. we know from Arrhenius theory, $pH=-<klux>LOG</klux>[H^+]$ 5.8 = -log[H^+] log[H^+] = -5.8 [H^+] = antilog( -5.8) = 1.58489 × 10^-6 SIMILARLY, pH = 12.8 -log[H^+] = 12.8 [H^+] = antilog(-12.8) = 1.58489 × 10^-13 now, use formula, $M_1V_1+M_2V_2=M(V_1+V_2)$ here, V1 and V2 are volumes of each solutions a/c to question, V1 = V2 = V (let) then, 1.58489 × 10^-6 × V + 1.58489 × 10^-13 × V = M × 2V (1.58489 × 10^-6 + 1.58489 × 10^-13)/2 = M M = 7.92445 × 10^-7 now, pH = -log(7.92445 × 10^-7) = 6.1

Discussion

29.	Calculate the enthalpy change for the reaction :-H2(g) + Cl2(g) → 2HCL(g)given that the bond energies H-H,Cl-Cl,and H-Cl bonds are 433, 244 and 431kj/ mol respectively.
Answer» Energy absorbed for dissociation of 1 mole of H-H bonds = 433 kJ/mol Energy absorbed for dissociation of 1 mole of Cl-Cl bonds = 244 kJ/mol Total energy absorbed = 677 kJ/mol Energy released in the formation of 2 moles of H-Cl bond = 431 X 2 = 862 kJ/mol Energy released is greater than Energy absorbed Hence, NET RESULT is the release of energy. Energy released = 862 – 677 = 185 kJ/mol For the given reaction, ∆rH = - 185 kJ/mol

29.

Calculate the enthalpy change for the reaction :-H2(g) + Cl2(g) → 2HCL(g)given that the bond energies H-H,Cl-Cl,and H-Cl bonds are 433, 244 and 431kj/ mol respectively.

Answer»

Energy absorbed for dissociation of 1 mole of H-H bonds = 433 kJ/mol

Energy absorbed for dissociation of 1 mole of Cl-Cl bonds = 244 kJ/mol

Total energy absorbed = 677 kJ/mol

Energy released in the formation of 2 moles of H-Cl bond = 431 X 2

= 862 kJ/mol

Energy released is greater than Energy absorbed

Hence, NET RESULT is the release of energy.

Energy released = 862 – 677

= 185 kJ/mol

For the given reaction, ∆rH = - 185 kJ/mol

Discussion

30.	Give reasonsa) Carbon cannot reduce the oxides of Na or Mgb) Nacl is not a conductor of electricity on solid state c) Iron articles are galvanised d) Metals like Na, K, Ca, and Mg are never found in their free stage in nature
Answer» A) Na and Mg has less affinity towards carbon because these metals are HIGHLY reactive. So carbon cannot reduce the oxides of Sodium and Magnesium. b) This is because it dissociates into ions in its the aquaeous state c) Galvanization is a protective coating of zinc that is done to steel or iron to prevent them from corrosion. The galvanised iron article is protected against RUSTING even if the zinc layer is broken because zinc is more gets oxidized easily oxidised than iron. So, when zinc layer on the surface of galvanised iron article is broken, then zinc continues to corrode but iron article does not corrode or rust. d) Because of it's electronic arrangement and low electro NEGATIVITY, these metal oxidizes easily even with air moisture. these metal tends to lose an ELECTRON to reach electronic state of Neon, the previous stable NOBEL gas.

Discussion

31.	What will be the work done when one mole of a gas expands isothermally from 15L to 50L against a constant pressure at 1atm at 25 C
Answer» ANSWER: The work done for the given process is -3546.55 J Explanation: To calculate the AMOUNT of work done for an isothermal process is given by the equation: $W=-P\Delta V=-P(V_2-V_1)$ W = amount of work done = ? P = pressure = 1 atm $V_1$ = initial volume = 15 L $V_2$ = FINAL volume = 50 L Putting values in above equation, we get: $W=-1atm\times (50-15)L=-35L.atm$ To convert this into joules, we use the conversion factor: $1L.atm=101.33J$ So, $-35L.atm=-35\times 101.3=-3546.55J$ The negative sign indicates the system is doing work. Hence, the work done for the given process is -3546.55 J

31.

What will be the work done when one mole of a gas expands isothermally from 15L to 50L against a constant pressure at 1atm at 25 C

Answer»

ANSWER: The work done for the given process is -3546.55 J

Explanation:

To calculate the AMOUNT of work done for an isothermal process is given by the equation:

$W=-P\Delta V=-P(V_2-V_1)$

W = amount of work done = ?

P = pressure = 1 atm

$V_1$ = initial volume = 15 L

$V_2$ = FINAL volume = 50 L

Putting values in above equation, we get:

$W=-1atm\times (50-15)L=-35L.atm$

To convert this into joules, we use the conversion factor:

$1L.atm=101.33J$

So, $-35L.atm=-35\times 101.3=-3546.55J$

The negative sign indicates the system is doing work.

Hence, the work done for the given process is -3546.55 J

Discussion

32.	What are the features of rutherford's atomic model?
Answer» RUTHERFORD ATOMIC MODAL . Rutherford overturned Thomson's model in 1911 with his well-known gold FOIL experiment in which he demonstrated that the atom has a tiny and heavy nucleus. Rutherford designed an experiment to use the alpha particlesemitted by a radioactive ELEMENT as probes to the unseen world of atomic STRUCTURE.

Discussion

33.	A farmer was unhappy, because of his crop yield. He discussed the problem with an agricultural scientist, and realized that the soil of his field was, either acidic or too basic. What remedy would you suggest, so that the farmer could get more yield from the field?
Answer» Heyaa☺ ________________________ The FARMER COULD GET more yield from the field by spreading or spraying CaCo3 that is lime stone powder.By this the PROBLEM the soil of his field was acidic to less crop yield. This less crop yield is because of acidic in nature.So,spraying CaCO3 which is base can solve this crop yielding problem. _________________________ Hope you understand..✌ #BeBrainly❤

Discussion

34.	The increase in the temperature of water above its boiling point in the pressure cooker is due to change in_______ a.Pressure b.Volume c.Mass d.All of these
Answer» The correct answer is Pressure i.e. option ( a ). • The INCREASE in the temperature of water above it's boiling point in the pressure COOKER is due to change in pressure. • Pressure is thrust that acts per UNIT area or the normal force that acts per unit area. • It is constant throughout the mass of any fluid. • In case of FLUIDS, pressure is exerted in all the directions.

Discussion

35.	AND
Answer» Hola User___________________ Here is Your ANSWER...!!! ____________________________ ⭐Actually welcome to the concept of the GASEOUS STATE ... ⭐according to the all laws if the gases of the.. CHARLES LAW , BOYLES LAW AND AVAGADROS LAW .. ⭐the ideal gas equation is GIVEN as .. ⭐PV = nRT ⭐SO ..from here we can SEE the relation as ... ⭐Pressure is inversely proportional to the VOLUME... ⭐Pressure is directly proportional to the Temperature... ⭐Volume is directly proportional to the Temperature. ____________________________________ Hope it helps u....☺

Discussion

36.	When 2s-2s,2p-2p and 2p-2s orbitals overlap ,the bond strength decrease in the order...?
Answer» 2P -2p > 2p-2s > 2s-2s

Discussion

37.	Formula of sodium plumbate
Answer» Na2O3Pb is the FORMULA of SODIUM Plumbate Its weight is 301.2 HOPE IT HELPS YOU PLEASE SAY THANKS

37.

Formula of sodium plumbate

Answer»

Na2O3Pb is the FORMULA of SODIUM Plumbate

Its weight is 301.2

HOPE IT HELPS YOU

PLEASE SAY THANKS

Discussion

38.	How many atoms of mercury are present in 1g of mercury
Answer» Molecular MASS of mercury = 80 g Given mass = 1 No. of atoms = (Given mass/ Molar mass) X AVAGADRO's no, = (1/80) x 6.022 x 10^23 =0.075275 x 10^23 = 7.5275 x 10^21

Discussion

39.	In a water molecule the mass of oxygen and hydrogen ratio
Answer» In other words the ratio of hydrogen to oxygen is 2:1, the ratio of hydrogen to water is 1:1, and the ratio of oxygen to water is 1:2. In water [H2O], Hydrogen and Oxygen are combined in a ratio of 2:1. TWO [2] atoms of hydrogen COMBINE with ONE atom of oxygen to form water. HOPE IT HELPED PLEASE MARK BRAINLIEST BE BRAINLY!!!!!!!!!!!!!!!!!!!!!

39.

In a water molecule the mass of oxygen and hydrogen ratio

Answer»

In other words the ratio of hydrogen to oxygen is 2:1, the ratio of hydrogen to water is 1:1, and the ratio of oxygen to water is 1:2. In water [H2O], Hydrogen and Oxygen are combined in a ratio of 2:1. TWO [2] atoms of hydrogen COMBINE with ONE atom of oxygen to form water.

HOPE IT HELPED

PLEASE MARK BRAINLIEST

BE BRAINLY!!!!!!!!!!!!!!!!!!!!!

Discussion

40.	What is the ratio of mass of electron to mass of proton ?
Answer» Proton ELECTRON mass ratio- Value- 1836.15267389 STANDARD-0.00000017 Relative standard uncertainty-9.5*10 to the POWER -11 Concise form- 1836.15267389(17).

Discussion

41.	Write a short note on fullerenes?
Answer» Fullerenes are allotrops of carbon containing clusters of 60 carbon atoms JOINED together forming SPHERICAL molecules Buckminster fullerenes are dark solid at room TEMPERATURE they are NITHER very hard nor very SOFT hope this will help you and please and mark this answer as brainlist

Discussion

42.	Which of the following metal would give hydrogen when added to dilute HCl iron copper and magnesium
Answer» Magnesium would give HYDROGEN when ADDED to DILUTE HCl because in reactivity series magnesium is above hydrogen so magnesium can DISPLACE hydrogen from hydrochloric acid. Hope this will help you. If you like my answer Please MARK it as brainliest And Be my follower if possible.

Discussion

43.	What is a China dish
Answer» It is an WATER CONTAINER that is USED in CHEMISTRY EXPERIMENTS

Discussion

44.	Name the process used for preparing soaps
Answer» It is CALLED as SAPONIFICATION.

Discussion

45.	The solubility of AgCl in 0.1 M NaCl is (Ksp of AgCl = 1.2*10 to the power -10)
Answer» $AgCl$ $<klux>1</klux>.2\times 10^{-9}moles/L$ Answer: The solubility of is is Explanation: Solubility product is defined as the EQUILIBRIUM constant in which a SOLID ionic COMPOUND is dissolved to produce its IONS in solution. It is represented as $K_{sp}$ The equation for the ionization of the silver chromate is given as: $AgCl\leftrightharpoons Ag^{+}+Cl^{-}$ $NaCl\rightarrow Na^{+}+Cl^{-}$ We are given: Solubility of $AgCl$ = S mol/L By stoichiometry of the reaction: 1 mole of $AgCl$ gives 1 mole of $Ag^{+}$ and 1 mole of $Cl^-$ . When the solubility of $AgCl$ is S moles/liter, then the solubility of $Ag^{+}$ will be S moles\liter and solubility of $Cl^-$ will be S+0.1 moles/liter. in 0.1 M NaCl. $K_{sp}=[Ag^+][Cl^-]$ $1.2\times 10^{-10}=[S][S+0.1]$ $S=1.2\times 10^{-9}moles/L$ $AgCl$ $1.2\times 10^{-9}moles/L$ Hence, the solubility of is

45.

The solubility of AgCl in 0.1 M NaCl is (Ksp of AgCl = 1.2*10 to the power -10)

Answer»

$AgCl$ $<klux>1</klux>.2\times 10^{-9}moles/L$ Answer: The solubility of is is

Explanation:

Solubility product is defined as the EQUILIBRIUM constant in which a SOLID ionic COMPOUND is dissolved to produce its IONS in solution. It is represented as $K_{sp}$

The equation for the ionization of the silver chromate is given as:

$AgCl\leftrightharpoons Ag^{+}+Cl^{-}$

$NaCl\rightarrow Na^{+}+Cl^{-}$

We are given:

Solubility of $AgCl$ = S mol/L

By stoichiometry of the reaction:

1 mole of $AgCl$ gives 1 mole of $Ag^{+}$ and 1 mole of $Cl^-$ .

When the solubility of $AgCl$ is S moles/liter, then the solubility of $Ag^{+}$ will be S moles\liter and solubility of $Cl^-$ will be S+0.1 moles/liter. in 0.1 M NaCl.

$K_{sp}=[Ag^+][Cl^-]$

$1.2\times 10^{-10}=[S][S+0.1]$

$S=1.2\times 10^{-9}moles/L$

$AgCl$ $1.2\times 10^{-9}moles/L$ Hence, the solubility of is

Discussion

46.	Although hydrogen is lighter than air it is not collected by the downward displacement of air.Why?
Answer» Hydrogen gets oxidised when it is exposed to oxygen which makes it burn with a pale blue FLAME and the RESIDUE is water. This means that it mixes with oxygen. DOWNWARD DISPLACEMENT of air requires a gas that does not mix with air and is lighter than air. Hydrogen is lighter than airbut mixes with air.

Discussion

47.	Describe the principle of the crystallization/Recrystallization ?
Answer» The PRINCIPLE BEHIND the crystallisation is that the amount of solute that can be dissolved by a solvent increases with temperature. In crystallisation, the impure SUBSTANCE is dissolved in a suitable solvent to reach its nearly SATURATED solution at a temperature higher than the ROOM temperature. The principle behind recrystallization is that the amount of solute that can be dissolved by a solvent increases with temperature. In recrystallization, a solution is created by dissolving a solute in a solvent at or near its boiling point. hope it will help you

Discussion

48.	K+ H2O=KOH +H2 balance the chemical equation
Answer» Here is the answer 2K+2H2O=2KOH+H2

Discussion

49.	Which property of sulphuric acid accounts for its use as a dehydrating agent?
Answer» Sulphuric acid is used as a drying agent since its hygroscopic nature. The hygroscopic nature of sulphuric acid is due to the fact that it absorbs water WITHOUT dissolving in it. This in turn due to the fact that sulphuric acid is has high AFFINITY to water thus making it a DEHYDRATING agent. All that only CONCENTRATED suphuric acid is the ONE which acts as a dehydrating agent and not dilute sulphuric acid.

49.

Which property of sulphuric acid accounts for its use as a dehydrating agent?

Answer»

Sulphuric acid is used as a drying agent since its hygroscopic nature.

The hygroscopic nature of sulphuric acid is due to the fact that it absorbs water WITHOUT dissolving in it. This in turn due to the fact that sulphuric acid is has high AFFINITY to water thus making it a DEHYDRATING agent.

All that only CONCENTRATED suphuric acid is the ONE which acts as a dehydrating agent and not dilute sulphuric acid.

Discussion

50.	The poisonous gas that comes out with petrol burning in a car is
Answer» Car exhaust releases many harmful gases such as HYDROCARBONS, nitrogen oxides, sulphur dioxide, etc. The most poisonous gas is carbon monoxide. Carbon monoxide is a colourless and ODOURLESS gas. Once entered in lungs, it enters HAEMOGLOBIN and reduces space for oxygen, thus reducing one's breathing capacity. HENCE, it is a very poisonous gas that comes out with PETROL burning in a car.

50.

The poisonous gas that comes out with petrol burning in a car is

Answer»

Car exhaust releases many harmful gases such as HYDROCARBONS, nitrogen oxides, sulphur dioxide, etc.

The most poisonous gas is carbon monoxide. Carbon monoxide is a colourless and ODOURLESS gas. Once entered in lungs, it enters HAEMOGLOBIN and reduces space for oxygen, thus reducing one's breathing capacity.

HENCE, it is a very poisonous gas that comes out with PETROL burning in a car.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An element e has a valency 3. Write the formula for its bromide oxide carbonate nitrite

Without using column chromatography, how will you separate a mixture of camphor andbenzoic acid?

Is it possible to see atoms these day

Give some information about PH.

When concentrated acid is added to water then which process is exothermic or endothermic?

BALANCE TEN CHEMICAL EQUATION WITH PHYSICAL STATES

Write chemical formula of washing soda how is it obtain from baking soda name one industrial use of washing soda

Q. Hydrogen peroxide , H2O2(aq) decomposes to H2O (l) and O2 (g) in a reaction that is first order in H2O2and has a rate constant k= 1.06 X 10-3 min -1.(i) How long it will take 15 % of a sample of H2O2 to decompose ?(ii) ​ How long it will take 85 % of a sample to decompose ?

the equilibrium constant for 2h2s = 2H2 + S2 is 0.0118 at 1300k while the heat of dissociation is 597.4kj. the standard equilibrium constant of the reaction is

Two separate bulbs contain ideal gases A and B . The density of A is twice as that of gas B . The molecular mass of gas A is half as that of B . If two gases are at same temperature , the ratio of the pressure of A to that of B is ?

Give three examples to show that hydrogen is a reducing agent

N2O4=2NO2 the observed molecular weight of N2O4 IS 80g/mol at 350K the percentage of dissociation of N2O4 at 350 K is

the experimental value for the molar mass of non volatile solute is twice the theoretical value what is the van't hoff factor for solute

How many structural isomers possible for bromopentane? Draw structure also.

Convert benzaldehyde to benzyl alcohol in precence of aqueos naoh

Chalk contains 3 % carbon 10% calcium 12% oxygen find the amount in gms of these substances in 1 kg

A gas occupies 70 litres at 27oC.What volume will it occupy at 273oC, pressure remaining constant?

Iupac nomenclature for alkanes alkanes and alkynes

Write the number of covlaent bonds in the molecule of propaneC3H8

What os the colour of a solution formed on dipping apiecw of zinc in dill sulphuric acida. colourlessb. turn redc. blackd. red

How many amines are possible with molecular formula c4h11n only structural isomers?

.......is the highest grade, while...... is the lowest grade coal1) Bituminous 2) Peat 3) Lignite 4) Anthracite

Word equation of Co+O2=CO2

02 n2 cl2 increasing order of number of covalent bonds

Explain the structure of cyclohexene and cyclohexane

Which gas is evolved during respiration in plants

Calcium acetate and calcium formate on dry distillation gives

ph of resultant solution formed by mixing of equal volumes of two solutions having ph 5.8 and ph 12.8

Calculate the enthalpy change for the reaction :-H2(g) + Cl2(g) → 2HCL(g)given that the bond energies H-H,Cl-Cl,and H-Cl bonds are 433, 244 and 431kj/ mol respectively.

Give reasonsa) Carbon cannot reduce the oxides of Na or Mgb) Nacl is not a conductor of electricity on solid state c) Iron articles are galvanised d) Metals like Na, K, Ca, and Mg are never found in their free stage in nature

What will be the work done when one mole of a gas expands isothermally from 15L to 50L against a constant pressure at 1atm at 25 C

What are the features of rutherford's atomic model?

A farmer was unhappy, because of his crop yield. He discussed the problem with an agricultural scientist, and realized that the soil of his field was, either acidic or too basic. What remedy would you suggest, so that the farmer could get more yield from the field?

The increase in the temperature of water above its boiling point in the pressure cooker is due to change in_______ a.Pressure b.Volume c.Mass d.All of these

AND

When 2s-2s,2p-2p and 2p-2s orbitals overlap ,the bond strength decrease in the order...?

Formula of sodium plumbate

How many atoms of mercury are present in 1g of mercury

In a water molecule the mass of oxygen and hydrogen ratio

In other words the ratio of hydrogen to oxygen is 2:1, the ratio of hydrogen to water is 1:1, and the ratio of oxygen to water is 1:2. In water [H2O], Hydrogen and Oxygen are combined in a ratio of 2:1. TWO [2] atoms of hydrogen COMBINE with ONE atom of oxygen to form water.

HOPE IT HELPED

PLEASE MARK BRAINLIEST

BE BRAINLY!!!!!!!!!!!!!!!!!!!!!

What is the ratio of mass of electron to mass of proton ?

Write a short note on fullerenes?

Which of the following metal would give hydrogen when added to dilute HCl iron copper and magnesium

What is a China dish

Name the process used for preparing soaps

The solubility of AgCl in 0.1 M NaCl is (Ksp of AgCl = 1.2*10 to the power -10)

Although hydrogen is lighter than air it is not collected by the downward displacement of air.Why?

Describe the principle of the crystallization/Recrystallization ?

K+ H2O=KOH +H2 balance the chemical equation

Which property of sulphuric acid accounts for its use as a dehydrating agent?

The poisonous gas that comes out with petrol burning in a car is

Q. Hydrogen peroxide , H2O2(aq) decomposes to H2O (l) and O2 (g) in a reaction that is first order in H2O2and has a rate constant k= 1.06 X 10-3 min -1.(i) How long it will take 15 % of a sample of H2O2 to decompose ?(ii) How long it will take 85 % of a sample to decompose ?