52639 + Interview Questions in Secondary School in Chemistry

1.	On burning magnesium ribbon a white ash is obtained that turns red litmus solution to blue.What is the name and nature of the white ash?
Answer» MAGNESIUM OXIDE is the WHITE ASH. mg+O2 - mgO nature is BASIC.

Discussion

2.	Why lithium is the strongest reducing agent whereas its ionization enthalpy is highest?
Answer» Hey mate^_^ Lithium being small in size has high ionization enthalpy.On the other hand because of small size it is EXTENSIVELY hydrated and has very high hydration enthalpy ........THUS Li has GREATER tendency to lose electron in solution than other metals.Thus ,Lithium is the strongest reducing AGENT.

Discussion

3.	How many structural isomerism of hexyl
Answer» The six carbons and 12 hydrogens FOUND in the FORMULA C6H12 can be arranged to form a surprising25 different structural isomers.

Discussion

4.	Calculate the concentration of f- in a solution saturated with mgf2 and srf2. Given ksp of mgf2 is 9.510-9 and ksp of srf2 is 410-9
Answer» $[F^-]=1.59\times 10^{-4}mol./L$ Answer: TOTAL CONCENTRATION of FLUORINE IONS Explanation: 1) $MgF_2\rightleftharpoons Mg^{2+}+2F^-$ S 2S $K_{sp}$ of $MgF_2$ = $9.5\times 10^{-9}=[S][2S]^2=4S^2$ $S=4.87\times 10^{-5} mol/L$ Concentration of fluorine ions in saturated SOLUTION of $MgF_2$ $[F^-]_{MgF_2}=2S=2\times 4.87\times 10^{-5} mol/L=9.74\times 10^{-5}mol/L$ ...(1) 2) $SrF_2\rightleftharpoons Sr^{2+}+2F^-$ S' 2S' $K_{sp}$ of $SrF_2$ = $4\times 10^{-9}=[S'][2S']^2=4S'^2$ $S'=3.1\times 10^{-5}mol/L$ Concentration of fluorine ions in saturated solution of $SrF_2$ $[F^-]_{SrF_2}=2S=2\times 3.1\times 10^{-5} mol/L=6.2\times 10^{-5}mol/L$ ...(2) $[F^-]$ Total Concentration of fluorine ions $=[F^-]_{MgF_2}+[F^-]_{SrF_2}=9.74\times 10^{-5}mol/L+6.2\times 10^{-5}mol/L=15.94\times 10^{-5}mol/L=1.59\times 10^{-4}mol./L$

4.

Calculate the concentration of f- in a solution saturated with mgf2 and srf2. Given ksp of mgf2 is 9.510-9 and ksp of srf2 is 410-9

Answer»

$[F^-]=1.59\times 10^{-4}mol./L$ Answer: TOTAL CONCENTRATION of FLUORINE IONS

Explanation:

1) $MgF_2\rightleftharpoons Mg^{2+}+2F^-$

S 2S

$K_{sp}$ of $MgF_2$ = $9.5\times 10^{-9}=[S][2S]^2=4S^2$

$S=4.87\times 10^{-5} mol/L$

Concentration of fluorine ions in saturated SOLUTION of $MgF_2$

$[F^-]_{MgF_2}=2S=2\times 4.87\times 10^{-5} mol/L=9.74\times 10^{-5}mol/L$ ...(1)

2) $SrF_2\rightleftharpoons Sr^{2+}+2F^-$

S' 2S'

$K_{sp}$ of $SrF_2$ = $4\times 10^{-9}=[S'][2S']^2=4S'^2$

$S'=3.1\times 10^{-5}mol/L$

Concentration of fluorine ions in saturated solution of $SrF_2$

$[F^-]_{SrF_2}=2S=2\times 3.1\times 10^{-5} mol/L=6.2\times 10^{-5}mol/L$ ...(2)

$[F^-]$ Total Concentration of fluorine ions

$=[F^-]_{MgF_2}+[F^-]_{SrF_2}=9.74\times 10^{-5}mol/L+6.2\times 10^{-5}mol/L=15.94\times 10^{-5}mol/L=1.59\times 10^{-4}mol./L$

Discussion

5.	Why is the position of hydrogen not justified in the modern periodic table?
Answer» Position of hydrogen is non justified as it shows similarities with alkali metals like Na, K etc in having 1 electron in OUTERMOST SHELL and also it shows similarities with halogen in TERMS of ELECTRONEGATIVITY. So it position could not be justified.

Discussion

6.	Relation between electrical conductivity and salt concentration
Answer» Hey mate here us u answer Conductivity is a MEASURE of water's capability to pass electrical flow. This ability is directly related to the concentration of ions in the water . These conductive ions COME from DISSOLVED salts and INORGANIC materials such as alkalis, chlorides, sulfides and carbonate compounds. Hope it HELPS u dear.................

6.

Relation between electrical conductivity and salt concentration

Answer»

Hey mate here us u answer

Conductivity is a MEASURE of water's capability to pass electrical flow. This ability is directly related to the concentration of ions in the water . These conductive ions COME from DISSOLVED salts and INORGANIC materials such as alkalis, chlorides, sulfides and carbonate compounds.

Hope it HELPS u dear.................

Discussion

7.	What is glacial acetic acid ?why it is so called?
Answer» Hii There!!! When Ethanoic Acid is cooled at a temprature of 290℃ it then freezed to form a SOLID which LOOKS absolutely LIKE a glacier. Hence, Ethanoic Acid is also known as " GLACIAL Acetic Acid ". _____________________ # ¢' $ # Hope it helps

Discussion

8.	What is product in chemistry
Answer» Answer: Products are the species formed from chemical reactions. During a chemical reaction reactants are TRANSFORMED into products after PASSING through a HIGH energy transition STATE. This process results in the consumption of the reactants.

8.

What is product in chemistry

Answer»

Answer:

Products are the species formed from chemical reactions. During a chemical reaction reactants are TRANSFORMED into products after PASSING through a HIGH energy transition STATE. This process results in the consumption of the reactants.

Discussion

9.	What happend with hydrogen reaction with vegetable oil presence of nickel
Answer» UNSATURATED vegetable oils can be 'hardened' by reacting them withhydrogen, a reaction called HYDROGENATION. During hydrogenation,vegetable oils are reacted with hydrogen gas at about 60ºC. A nickel catalyst is used to SPEED up the reaction. The double bonds are CONVERTED to single bonds in the reaction.

Discussion

10.	Complete the word pair chlorine 2 , 8 , 7 than fluorine
Answer» ELECTRONIC CONFIGURATION of CHLORINE = 2,8,7 Electronic configuration of FLOURINE = 2,7

Discussion

11.	Which postulate of dalton's atomic theory is a result of the law of constant proportion
Answer» Atoms are indivisible particles, which cannot be created nor destroyed in a CHEMICAL reaction.this POSTULATE of DALTON ATOMIC THEORY is result of the law of constant proportion. HOPE YOU LIKE IT

Discussion

12.	How to convert propanol to propane
Answer» The CHEMICAL REACTION ATTACHE in below.....................

Discussion

13.	How can I convert Benzene diazonium chloride to benzene ??????????
Answer» The reagent that can be used to CONVERT BENZENE diazonium chloride to benzene are => SNCL2 / HCl. Hope this answer helps you......

Discussion

14.	CH3-CH2-CH2-CH3 .The compound is?
Answer» It is COMPOUND BUTANE....

Discussion

15.	Due to what property of matter we are able to dive in water
Answer» Because WATER have INTERPARTICLE SPACE between them

Discussion

16.	Does potable water mean pure water without any impurities?
Answer» YES it is KNOWN as POTABLE WATER

Discussion

17.	Explain the function of salt bridge
Answer» ~~HERES YOUR ANSWER~~ ___________________ The purpose of salt bridge is not to move electrons from the electrolyte , rather its to maintain CHARGE BALANCE because the electrons are moving from the half-cell to the other. The electrons move from the anode to the cathode. ___________________ ☺ PLZZ MARK AS BRAINLEAST ....

Discussion

18.	The only element which has simple cubic arrangement
Answer» Polonium has SIMPLE CUBIC arrangement hope you LIKE the ANSWER

Discussion

19.	Reactivity series plzzzzz
Answer» HEY PLS follow me because I have told you the easiest way of remember it ALSO

Discussion

20.	phenolphthalein indicator is a which type of indicator ( 1) natural 2) chemical 3) universal 4) all of above
Answer» And is 3) UNIVERSAL. THX

Discussion

21.	What is mole? and what is the importance of mole
Answer» . The MOLE is the unit of amount in chemistry. It provides a BRIDGE between the atom and the macroscopic amounts of material that we work with in the laboratory. It ALLOWS the chemist to weigh out amounts of two SUBSTANCES, say iron and SULFUR, such that equal numbers of atoms of iron and sulfur are obtained.

Discussion

22.	State gay lussacas law
Answer» Gay-Lussac's law is an ideal gas lawwhere at constant VOLUME, the pressureof an ideal gas is directly PROPORTIONAL to its absolute TEMPERATURE (Kelvin). The FORMULA for the law may be STATED as Pi/Ti = Pf/Tf hey plz mark as brainlist

Discussion

23.	What is Contact process
Answer» The contact process is the current method of producing sulfuric ACID in the high concentrations needed for industrial processes. Platinum used to be the catalyst for this reaction; HOWEVER, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, vanadium(V) oxide is now preferred hey brother u have 4 brainlist ANSWER of 5 plz mark this as brainlist

Discussion

24.	A short and sweet defination of "functional group"
Answer» A GROUP of atoms responsible for the CHARACTERISTIC REACTIONS of a PARTICULAR compound. hope it HELPS u mark as brainlist plz

Discussion

25.	What is resonance? explain plzzzz
Answer» The SOUND PRODUCED in an object by sound of a SIMILAR FREQUENCY from ANOTHER object

Discussion

26.	Calculate the mass of one atom of hydrogen atom
Answer» 1 mole of H WEIGHTS 1.008 g 1 mole = 6.02 X 10^23 particles Mass of 1 atom = 1.008 g / 6.02 x 10^23 = 1.67 x 10^-24 g

Discussion

27.	What is a buffer solution?Discuss buffer action of both acidic buffer and basic buffer solutions.
Answer» A buffer is a solution CONTAINING the weak acid and it CONJUGATE BASE in SIMILAR amount.

Discussion

28.	What will be the ph salt made from strong acid and weak base
Answer» $\textbf{\large{Answer -}}$ The solution of salt of strong ACID and weak base are acidic in NATURE i.e., $\textbf {\underline {pH of solution will be always less than 7.}}$ The salt of strong acid and weak base are $NH_{4}Cl, (NH_{4})_{2}SO_{4}, NH_{4}NO_{3}.$ EXAMPLE : $NH_{4}Cl + H_{2}O ==> NH_{4}OH + HCl$ Here $NH_{4}Cl$ and $HCl$ are strong, so they will be dissociated as follow : ${NH_{4}}^{+} + {Cl}^{-} + H_{2}O ==> NH_{4}OH + {H}^{+} + {Cl}^{-}$ $\boxed{{NH_{4}}^{+} + H_{2}O ==> NH_{4}OH + {H}^{+}}$

Discussion

29.	Why does Inert gases placed in zero group?
Answer» $\color{red}\huge\bold\star\underline\mathcal{Hey\:Mate}\star$ Here is your answer...☺☺☺ ➡➡➡➡➡➡➡➡➡➡➡➡➡➡➡➡➡➡➡ That is because elements of inert gases have an OCTET structure whichhas fully paired electrons. Inert gasesor noble gases have already completed their octet (zero VELENCY) an hence are STABLE and do not react with other elements or make any compounds. Hence, it makes a lot sense that they are placed in GROUP zero. ✔✔✔✔✔✔✔✔✔✔✔✔✔✔✔✔✔✔✔ I hope this answer is helpful to U...❤❤❤ Keep Asking...✌✌✌ ✨✨✨If help you. Mark my answer as a brainliest✨✨✨ $❤❤❤❤ THANK YOU ❤❤❤❤$

Discussion

30.	What is black carbon and how is ti prepared? Give its important uses
Answer» Black carbon consists of pure carbon in SEVERAL linked forms! it is produced through the incomplete combustion of fossil FUEL , BIOFUEL , biomass!! Its used as COLOR pigments , Ink and mainly used as reinforcing filler in tires and other rubber products! HOPE IT HELPS U MATE!! BE BRAINLY AND IF IT DOES HELP U THEN PLZZ MARK IT AS BRAINLIEST!!

Discussion

31.	Pb(OH)Cl is which salt
Answer» 2Pb(OH)CL PbO + PbCl2 + H2O. The thermal decomposition of lead(II) chloride-hydroxide to PRODUCE oxide lead(II), lead(II) chloride and water. salt that has hydroxyl in its formula, e.g., basic lead nitrate (Pb[OH]NO 3), is called a basicsalt. i hope it HELPS you:)

Discussion

32.	How many types of reproduction are there in plants
Answer» HELLO FRIEND.. here's your answer.. there are THREE types of reproduction in plants.. namely asexual, sexual and vegetative reproduction... HOPE you understand...

Discussion

33.	Will it work satisfactorily of lime water is used instead of potassium hydroxide to show that carbon dioxide is necessary for photosynthesis
Answer» YEAH K(OH) have GREAT effinity for CO2

Discussion

34.	Convert ethane to chlroethaneChemical equation
Answer» C2h6+cl2--c2h5cl+hcl c2h5cl+cl2--c2h4cl+hcl c2h4cl±cl2--c2h3cl±hcl c2h3cl±cl2--c2h2cl+hcl c2h2cl+cl2--c2hcl+hcl

Discussion

35.	Explain why a desert cooler cools better on a hot dry day
Answer» Because on a Hot DRY DAY temperature is high and humidity is less which helps in better Evaparetion . DUE to the higher rate of evaporation it give better cooling EFFECT

Discussion

36.	What is esters? how are esters prepared? write the chemical for the reaction involved? what happens when an esters reacts with sodium hydroxide? write the chemical equation for the reaction and also state the name and use of this reaction?
Answer» What is esters? => Ester is an organic compound in the field of chemistry , which is produced by the reaction of acid with alcohols. It is denoted by R - (OR')C=O where R and R' are alkyl groups. how are esters prepared? write the chemical for the reaction involved? => Esters can be prepared with many reactions but mostly used and preferred reaction is the reaction of carboxylic Acid with alcohol with RESULTS in FORMATION of ester and water molecule. The yield can be improved using a little of suphuric acid as the catalyst will increase the rate . The process of FORMING ester is called esterification. R-CO²-H + HO-R' == R-CO² -R + H²O what happens when an esters reacts with sodium hydroxide? write the chemical equation for the reaction and also state the name and use of this reaction? When ester reacts with Sodium hydroxide , the corresponding products formed will be carboxylic acid of sodium salt and a alcohol group. R-CO²-R' + NaOH ==> R-CO²-Na + R'-OH This process is called saponification. The name is due to REASON because this is used in preparation of soap

36.

What is esters? how are esters prepared? write the chemical for the reaction involved? what happens when an esters reacts with sodium hydroxide? write the chemical equation for the reaction and also state the name and use of this reaction?

Answer»

What is esters?

=> Ester is an organic compound in the field of chemistry , which is produced by the reaction of acid with alcohols.

It is denoted by R - (OR')C=O

where R and R' are alkyl groups.

how are esters prepared? write the chemical for the reaction involved?

=> Esters can be prepared with many reactions but mostly used and preferred reaction is the reaction of carboxylic Acid with alcohol with RESULTS in FORMATION of ester and water molecule.

The yield can be improved using a little of suphuric acid as the catalyst will increase the rate . The process of FORMING ester is called esterification.

R-CO²-H + HO-R' == R-CO² -R + H²O

what happens when an esters reacts with sodium hydroxide? write the chemical equation for the reaction and also state the name and use of this reaction?

When ester reacts with Sodium hydroxide , the corresponding products formed will be carboxylic acid of sodium salt and a alcohol group.

R-CO²-R' + NaOH ==> R-CO²-Na + R'-OH

This process is called saponification.

The name is due to REASON because this is used in preparation of soap

Discussion

37.	Liquid and gas are commonly known as fluid . Compare their properties and show that they can flow? Which property of fluid is essential for the survival of aquatic life?
Answer» Properties of Fluids The term fluid includes both liquid and gases. The main difference between a liquid and a gas is that the volume of a liquid remains definite because it takes the shape of the surface on or in which it comes into contact, whereas a gas occupies the complete space available in the container in which it is kept. In hydraulics in civil engineering, the fluid for consideration is liquid, so, we will examine some terms and properties of the liquids. Mass Density: It is the mass of the fluid PER unit volume. It unit is kg per cubic meter. Specific Weight: It is the weight per unit volume of the fluid. This quantity depends on the gravitational force of the place where the fluid is kept. The units for it are NEWTON per cubic meter Specific Volume: It is the volume occupied by the unit mass of the fluid. Its unit is cubic meter per kg. Relative Density or Specific Gravity: It is DEFINED as the ratio of mass density of the fluid concerned and the mass density of water at standard pressure and temperature, i.e., 4 degrees Celsius and atmospheric pressure. Viscosity: Viscosity is the property of fluid which defines the interaction between the moving particles of the fluid. It is the measure of resistance to the flow of fluids. The viscous force is due to the INTERMOLECULAR forces acting in the fluid. The flow or rate of deformation of fluids under shear stress is different for different fluids due to the difference in viscosity. Fluids with high viscosity deform slowly. Compressibility: When pressure is applied on a fluid, its volume decreases. This property of a fluid is called compressibility. Elasticity: When the force generating the pressure on the fluid, is released it returns to its original volume. This property of a fluid is called elasticity of the fluid. Vapor Pressure: Molecules of a liquid escape from its surface to fill the space above the liquid surface and the container until such time when the pressure due to these molecules above the liquid surface reaches the vapor pressure of the liquid. This is how the vapor pressure of a liquid is defined. Surface Tension: The molecules on the surface of a liquid, that is, the interface between the liquid and the air are bound together by a week force called surface tension. This force makes the liquid form a layer and is caused due to the cohesive force between the molecules of the liquid. Capillarity: The molecules of a liquid have two types of forces acting on them. One is, cohesive force, the force among the molecules of the liquid only, and the other one is adhesive force, the force acting between the molecules of the liquid and some other substance. When the ADHESION between the liquid and the container wall is more than the cohesion among the liquid molecules, the liquid sticks to the container walls and this results in capillary rise. The opposite of this behavior happens when the cohesion is more than the adhesion – the capillary level dips.

37.

Liquid and gas are commonly known as fluid . Compare their properties and show that they can flow? Which property of fluid is essential for the survival of aquatic life?

Answer»

Properties of Fluids

The term fluid includes both liquid and gases. The main difference between a liquid and a gas is that the volume of a liquid remains definite because it takes the shape of the surface on or in which it comes into contact, whereas a gas occupies the complete space available in the container in which it is kept. In hydraulics in civil engineering, the fluid for consideration is liquid, so, we will examine some terms and properties of the liquids.

Mass Density: It is the mass of the fluid PER unit volume. It unit is kg per cubic meter.

Specific Weight: It is the weight per unit volume of the fluid. This quantity depends on the gravitational force of the place where the fluid is kept. The units for it are NEWTON per cubic meter

Specific Volume: It is the volume occupied by the unit mass of the fluid. Its unit is cubic meter per kg.

Relative Density or Specific Gravity: It is DEFINED as the ratio of mass density of the fluid concerned and the mass density of water at standard pressure and temperature, i.e., 4 degrees Celsius and atmospheric pressure.

Viscosity: Viscosity is the property of fluid which defines the interaction between the moving particles of the fluid. It is the measure of resistance to the flow of fluids. The viscous force is due to the INTERMOLECULAR forces acting in the fluid. The flow or rate of deformation of fluids under shear stress is different for different fluids due to the difference in viscosity. Fluids with high viscosity deform slowly.

Compressibility: When pressure is applied on a fluid, its volume decreases. This property of a fluid is called compressibility.

Elasticity: When the force generating the pressure on the fluid, is released it returns to its original volume. This property of a fluid is called elasticity of the fluid.

Vapor Pressure: Molecules of a liquid escape from its surface to fill the space above the liquid surface and the container until such time when the pressure due to these molecules above the liquid surface reaches the vapor pressure of the liquid. This is how the vapor pressure of a liquid is defined.

Surface Tension: The molecules on the surface of a liquid, that is, the interface between the liquid and the air are bound together by a week force called surface tension. This force makes the liquid form a layer and is caused due to the cohesive force between the molecules of the liquid.

Capillarity: The molecules of a liquid have two types of forces acting on them. One is, cohesive force, the force among the molecules of the liquid only, and the other one is adhesive force, the force acting between the molecules of the liquid and some other substance. When the ADHESION between the liquid and the container wall is more than the cohesion among the liquid molecules, the liquid sticks to the container walls and this results in capillary rise. The opposite of this behavior happens when the cohesion is more than the adhesion – the capillary level dips.

Discussion

38.	It is possible to determine the material in edible or not by using pH ? how ?
Answer» Ph of acidic is 0 to 6 and 7 is neutral 0,1,2, is highly acidic and 8 to 14 is bacidic 8,9,10 is highhly bacidic then u FIND any substance which was acidix or bacic

Discussion

39.	Identify odd man out 1) Potassium Sulphate 2) sodium chloride 3)Sodium Acetate 4) potassium chloride
Answer» 3) SODIUM Acetate is odd one. this is because Sodium Acetate is a basic salt which CONTAINS WEAK acid called acetic acid and STRONG base called sodium hydroxide. PLEASE MARK MY ANSWER AS A BRAINLIEST ANSWER.

Discussion

40.	What are transition elements Discuss there general Characteristics
Answer» d BLOCK ELEMENTS are KNOWN as TRANSITION elements

Discussion

41.	Describe electrolysis briefly best one will be marked as brainlist
Answer» ELECTROLYSIS of Molten Salts. Electrolysis is a PROCESS by which electrons are FORCED through a chemical cell, thus causing a chemical reaction. The POSITIVE charge usually attracts electrons, and the electrode PROVIDING electrons is called cathode, because reduction takes place on it.

Discussion

42.	What is Latin name of sodium?
Answer» LATIN name :natrium English name :sodium year of discovery :1807 CAS no.:CAS7440-23-5 discovered by:humphry Davy Atomic number: 11 Atomic weight (Relative atomic mass): 22.9897 (g/mol) Density: 0.971 (g/cm³) MELTING POINT: 97.8 °C = 208.04 °F = 370.95 K Boiling point: 882.95 °C = 1621.31 °F = 1156.1 K Period: 3 Group: IA Block: s - block please MARK as brainiest

Discussion

43.	Write uses of silver nitrate in daily life
Answer» HERES your ANSWER HOPE IT HELPS

Discussion

44.	The correct set up to pass carbondioxide to lime water
Answer» Carbon dioxide PASSED intolimewater gives a milky solution, due to precipitation of an insoluble suspension of calcium CARBONATE: Ca(OH)2(aq) + CO2(g) → CACO3(s) + H2O(l)

Discussion

45.	What is observed when dry rose petals are placed in the jar of sulphur dioxide
Answer» In the said query, one of our users asked that what will be OBSERVED when dry red rose PETALS are placed in a jar of sulphur dioxide. In the answer, it was explained that sulphur dioxide is a good reducing agent and decolourises substances in the presence of water. THUS, when moisture is present, then sulphur dioxide will decolourise substances. Fresh rose petals have some moisture CONTENT, because of which they can be decolourised by the ACTION of sulphur dioxide.But since the rose petals are dry, therefore they are not decolouirsed by sulphur dioxide. In other words, no action is observed on rose petals. The same has been explained in the answer.

Discussion

46.	Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate giving an activity illustrate how these are interconvertible
Answer» a) HYDRATED copper sulphate – CuSO4.5H2O Anhydrous copper sulphate – CuSO4. Activity : (i) Heat a few crystals of copper sulphate in a dry boiling tube. (ii) Add 2-3 drops of WATER on the sample of copper sulphate obtained after heating. After heating, water is REMOVED and salt turns white. If crystal are moisten again with water, blue colour reappears. Water of crystallization is fixed number of water molecules present in one formulae UNIT of a salt. Five water molecules are present in one formula unit of copper sulphate. (b) Calcium sulphate hemihydrate – CASO4. H2O Calcium sulphate dihydrate – CaSO4.2H2O. hope it helps!

46.

Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate giving an activity illustrate how these are interconvertible

Answer»

a) HYDRATED copper sulphate – CuSO4.5H2O Anhydrous copper sulphate – CuSO4. Activity :

(i) Heat a few crystals of copper sulphate in a dry boiling tube.

(ii) Add 2-3 drops of WATER on the sample of copper sulphate obtained after heating. After heating, water is REMOVED and salt turns white. If crystal are moisten again with water, blue colour reappears. Water of crystallization is fixed number of water molecules present in one formulae UNIT of a salt. Five water molecules are present in one formula unit of copper sulphate.

(b) Calcium sulphate hemihydrate – CASO4. H2O Calcium sulphate dihydrate – CaSO4.2H2O.

hope it helps!

Discussion

47.	In the presence of acid catalyst,ethanoic acid reacts with ethanol and______ester is produced.a.ethanolb.ethanoicc.ethyl ethanoated.ethyl alcohol
Answer» The ANSWER is C, ESTER is ETHYL ethanoate

Discussion

48.	List of articles in day to day life where electroplating is used
Answer» Electroplating is the PROCESS of coating one metal with another metal to enhance its look. Articles used in daily life where electro plating is used: 1. TIN coating food containers. Where iron is coated with tin. 2. GOLD and silver coating is done for ornaments. 3. Nickel coating is done in articles like DECORATIVE ITEMS, cars and machinery parts. 4. Chromium coating for extra shine and lustrous like handled of cycle and rims of wheels. 5.Zinc coating in industries in machinery parts. Read more on Brainly.in - brainly.in/question/1632444#readmore

48.

List of articles in day to day life where electroplating is used

Answer»

Electroplating is the PROCESS of coating one metal with another metal to enhance its look.

Articles used in daily life where electro plating is used:

1. TIN coating food containers.

Where iron is coated with tin.

2. GOLD and silver coating is done for ornaments.

3. Nickel coating is done in articles like DECORATIVE ITEMS, cars and machinery parts.

4. Chromium coating for extra shine and lustrous like handled of cycle and rims of wheels.

5.Zinc coating in industries in machinery parts.

Read more on Brainly.in - brainly.in/question/1632444#readmore

Discussion

49.	Take two test tubes with about 10ml of hard water in each. Add 5drops of soap solution to one and five drops of detergent solution to the other. Shake both test tubes for the same period. Do both test tubes have the same amount of foam?
Answer»

Discussion

50.	Urgentif 1.0 Kcal of heat is added to 1.2 L of O2 in a cylinder of constant pressure of 1 atm ,the volume increases to 1.5 L. calculate delta U delta H of the process.
Answer» $\Delta U=992.737cal$ $\Delta H=1000cal$ Answer : and Solution : Given, Heat = 1 Kcal = 1000 CAL (1 Kcal = 1000 cal) Initial volume = 1.2 L Final volume = 1.5 L Pressure = 1 atm Formula used : $\Delta U=q-w\\\Delta U=q-P\Delta V\\\Delta U=q-P(V_{final}-V_{initial})$ Now PUT all the given VALUES in this formula, we get $\Delta U=1000cal-[1atm\times (1.5L-1.2L)]\times 24.21=992.737cal$ $(1Latm=24.21cal)$ $\Delta H$ Now we have to CALCULATE the . At constant pressure, $\Delta H=q_p$ So, $\Delta H=q_p=1000cal$ $\Delta U=992.737cal$ $\Delta H=1000cal$ THEREFORE, and

50.

Urgentif 1.0 Kcal of heat is added to 1.2 L of O2 in a cylinder of constant pressure of 1 atm ,the volume increases to 1.5 L. calculate delta U delta H of the process.

Answer»

$\Delta U=992.737cal$ $\Delta H=1000cal$ Answer : and

Solution : Given,

Heat = 1 Kcal = 1000 CAL (1 Kcal = 1000 cal)

Initial volume = 1.2 L

Final volume = 1.5 L

Pressure = 1 atm

Formula used :

$\Delta U=q-w\\\Delta U=q-P\Delta V\\\Delta U=q-P(V_{final}-V_{initial})$

Now PUT all the given VALUES in this formula, we get

$\Delta U=1000cal-[1atm\times (1.5L-1.2L)]\times 24.21=992.737cal$ $(1Latm=24.21cal)$

$\Delta H$ Now we have to CALCULATE the .

At constant pressure, $\Delta H=q_p$

So, $\Delta H=q_p=1000cal$

$\Delta U=992.737cal$ $\Delta H=1000cal$ THEREFORE, and

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

On burning magnesium ribbon a white ash is obtained that turns red litmus solution to blue.What is the name and nature of the white ash?

Why lithium is the strongest reducing agent whereas its ionization enthalpy is highest?

How many structural isomerism of hexyl

Calculate the concentration of f- in a solution saturated with mgf2 and srf2. Given ksp of mgf2 is 9.5*10-9 and ksp of srf2 is 4*10-9

Why is the position of hydrogen not justified in the modern periodic table?

Relation between electrical conductivity and salt concentration

What is glacial acetic acid ?why it is so called?

What is product in chemistry

What happend with hydrogen reaction with vegetable oil presence of nickel

Complete the word pair chlorine 2 , 8 , 7 than fluorine

Which postulate of dalton's atomic theory is a result of the law of constant proportion

How to convert propanol to propane

How can I convert Benzene diazonium chloride to benzene ??????????

CH3-CH2-CH2-CH3 .The compound is?

Due to what property of matter we are able to dive in water

Does potable water mean pure water without any impurities?

Explain the function of salt bridge

The only element which has simple cubic arrangement

Reactivity series plzzzzz

phenolphthalein indicator is a which type of indicator ( 1) natural 2) chemical 3) universal 4) all of above

What is mole? and what is the importance of mole

State gay lussacas law

What is Contact process

A short and sweet defination of "functional group"

What is resonance? explain plzzzz

Calculate the mass of one atom of hydrogen atom

What is a buffer solution?Discuss buffer action of both acidic buffer and basic buffer solutions.

What will be the ph salt made from strong acid and weak base

Why does Inert gases placed in zero group?

What is black carbon and how is ti prepared? Give its important uses

Pb(OH)Cl is which salt

How many types of reproduction are there in plants

Will it work satisfactorily of lime water is used instead of potassium hydroxide to show that carbon dioxide is necessary for photosynthesis

Convert ethane to chlroethaneChemical equation

Explain why a desert cooler cools better on a hot dry day

What is esters? how are esters prepared? write the chemical for the reaction involved? what happens when an esters reacts with sodium hydroxide? write the chemical equation for the reaction and also state the name and use of this reaction?

It is denoted by R - (OR')C=O

R-CO²-H + HO-R' == R-CO² -R + H²O

R-CO²-R' + NaOH ==> R-CO²-Na + R'-OH

Liquid and gas are commonly known as fluid . Compare their properties and show that they can flow? Which property of fluid is essential for the survival of aquatic life?

It is possible to determine the material in edible or not by using pH ? how ?

Identify odd man out 1) Potassium Sulphate 2) sodium chloride 3)Sodium Acetate 4) potassium chloride

What are transition elements Discuss there general Characteristics

Describe electrolysis briefly best one will be marked as brainlist

What is Latin name of sodium?

Write uses of silver nitrate in daily life

The correct set up to pass carbondioxide to lime water

What is observed when dry rose petals are placed in the jar of sulphur dioxide

Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate giving an activity illustrate how these are interconvertible

In the presence of acid catalyst,ethanoic acid reacts with ethanol and______ester is produced.a.ethanolb.ethanoicc.ethyl ethanoated.ethyl alcohol

List of articles in day to day life where electroplating is used

Take two test tubes with about 10ml of hard water in each. Add 5drops of soap solution to one and five drops of detergent solution to the other. Shake both test tubes for the same period. Do both test tubes have the same amount of foam?

Urgentif 1.0 Kcal of heat is added to 1.2 L of O2 in a cylinder of constant pressure of 1 atm ,the volume increases to 1.5 L. calculate delta U delta H of the process.

Calculate the concentration of f- in a solution saturated with mgf2 and srf2. Given ksp of mgf2 is 9.510-9 and ksp of srf2 is 410-9