8881 + Interview Questions in Chemistry in Class 10 Page 69 InterviewSolution

3401.	Some batteries are rechargeable, whereas others must be thrown away after they get discharged. Justify with respect to the concept of electrochemical cells.
Answer» Solution :(i) Reversible cell reaction (II) Requisite for an ELECTROCHEMICAL cell. (iii) Change TAKING place in a battery as electrochemical cell. (IV) Effect of this change on the working of battery. (v) Requisite for the revival of the function. (vi) Change that takes place during the above process.

Discussion

3402.	Some articles made of silver, copper and iron get coloured coating over them when they are exposed to air . Identify the colour andchemical name of the substance of coating in each case.
Answer» Solution :(i) Silver:Colour-Black (II) Copper: Colour-Green Chemical NAME-Copper oxide (iii) Iron : Colour-Reddish BROWN Chemical name -FERRIC oxide.

Discussion

3403.	Solutions which contain three components are called binary solution.
Answer» Solution :CORRECT STATEMENT: Solutions which CONTAIN two COMPONENTS are called BINARY solution.

Discussion

3404.	Solutions A and B have pH 5 and 10 respectively . Which one of these solutions is alkaline?
Answer» A B both NONE of these ANSWER :B

Discussion

3405.	Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution is a strong acid?
Answer» ANSWER :R

Discussion

3406.	Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution will liberate ammonia from ammonium sulphate on heating?
Answer» <P> ANSWER :P

Discussion

3407.	Solution of sulphur in CS_2 is a suitable example for non-aqueous solution.
Answer» ANSWER : TRUE

Discussion

3408.	Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution contains solute molecules as well as ions?
Answer» ANSWER :Q

Discussion

3409.	solution of SO_(2) gasin water is acidic due to the formation of
Answer» `H_(2)SO_(4)` `H_(2)SO_(3)` `H_(2)S` `SO_(3)` Answer :B

Discussion

3410.	Solution is madefrom 35 mlof Methanoland 65mlof water. Calculatethe volumepercentage.
Answer» Solution :VOLUME of theethanol= 35 ML Volumeof thewater `=65ml` volumepercentage `=("volumeof the solute")/("Volumeof the solution") xx 100` volumepercentage `=( "Volumeof THESOLUTE")/(" Volumeofsolute+ Volumeof thesolvent ") xx 100` `=(35 )/(35+65 ) xx 100= ( 35 )/(100 ) xx 100 =35 %`

Discussion

3411.	Solution has a pOH of 11.76 What is the pH of this solution?
Answer» SOLUTION :pH=14-pOH ph=14-11.76 =2.24

Discussion

3412.	Solution A is a strong acid Solution B is a weak alkali Solution C is a strong alkali Which solution contains solute molecules in addition to water molecules ?
Answer» Solution :(i) Solution B (ii) Solution C (III) Solution B (IV) Ammonium hydroxide

Discussion

3413.	Solution A is a sodium hydroxide solution. Solution B is a weak acid. Solution C is dilute sulphuric acid. Which solution will (i) liberate sulphur dioxide from sodium sulphite? (ii) give a white precipitate with zinc sulphate solution? (iii) contain solute molecules and ions?
Answer» ANSWER :(i) C (II) A (III) B

Discussion

3414.	Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B and which one of the solutions A and B will have a higher pH value ?
Answer» Solution :Solution A is ALKALINE in NATURE. Solution B is ACIDIC in nature. Solution A has a HIGHER pH value.

Discussion

3415.	Solubility of oxygen is more in cold water.
Answer» ANSWER : TRUE

Discussion

3416.	Solubility of KNO_3 increases with the ........... in temperature
Answer» SOLUTION :INCREASE

Discussion

3417.	Solubility of KNO_3 in water is ......process.
Answer» EXOTHERMIC ENDOTHERMIC Isothermic ADIABATIC SOLUTION :endothermic

Discussion

3418.	Solubility of CuSO_4 , in H_2 O is 36g at 25^@ C.
Answer» Solution :FALSE Correct STATEMENT: SOLUBILITY of `CuSO_4`in `H_2 O` is 20.7g at `20^@ C`.

Discussion

3419.	Solubility of CaO increases with the increase in temperature.
Answer» SOLUTION :Correct statement: The solubility of CAO decreases with the INCREASE in TEMPERATURE.

Discussion

3420.	Solubility of CaO decreases with the .................. in temperature.
Answer» SOLUTION :INCREASE

Discussion

3421.	Solubility of CaO in water is ......... process.
Answer» EXOTHERMIC endothermic Adiabatic ISOTHERMIC SOLUTION :Exothermic

Discussion

3422.	Solubilityof a solidsoluteis a liquidsolventincreaseswithincrease in_______.
Answer» SOLUTION :TEMPERATURE

Discussion

3423.	Solubility is equal to .......
Answer» `("Massof THESOLUTE ")/(" Massof THESOLUTION ") xx100` `("Massof thesolution")/(" Massof thesolute ") xx100` `("Massofthesolvent")/("Massof thesolute ") xx 100` `("Massof the solvent")/(" Massof thesolute ")xx 100` SOLUTION :`("Massofthesolvent")/("Massof thesolute ") xx 100`

Discussion

3424.	Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slakingof lime and the solution formed ? It is an endothermic reaction. (ii) It is an exothermic reaction. (iii) The pH of the resulting solution will be more than seven. (iv) The pH of the resulting solution will be less than seven.
Answer» (i) and (II) (ii) and (iii) (i) and (iv) (iii) and (iv) Solution :Heat is liberated when solid calcium OXIDE reacts with water. Calcium HYDROXIDE produced, being a base, has pH more than 7.

Discussion

3425.	Solid calcium oxide was taken in a container and water was added slowly to it. (i) State the two observations made in the experiment. (ii) Write the name and chemical formula of the product formed.
Answer» Solution :(i) FOLLOWING are the TWO observations: (a) Calcium oxide (CaO) reacts vigorously with WATER to FORM slaked lime. (b) The container becomes hot because a large amount of heat is released during this reaction. (iii) The PRODUCT formed is slaked lime for which the chemical formula is `Ca(OH)_(2)`. `underset("oxide")underset("Calcium")(CaO(s))+underset("Water")(H_(2)O(l))rarrunderset(("Calcium hydroxide"))underset("Slaked lime")(Ca(OH)_(2)(aq))`

Discussion

3426.	Solder is an alloy of ......... and........
Answer» SOLUTION :LEAD, TIN

Discussion

3427.	Solder is an alloy of
Answer» `SN` and `Pb` `CU` and `Sn` `Cu` and `Zn` `Cu` and `AL` ANSWER :A

Discussion

3428.	Solar energy is used in homes and offices for ____ purposes.
Answer» SOLUTION :HEATING

Discussion

3429.	Soil is an example of
Answer» HOMOGENEOUS MIXTURE element compound HETEROGENEOUS Mixture Solution : heterogeneous Mixture

Discussion

3430.	Soft drinks contains
Answer» ACETIC acid tartaric acid CARBONIC acid nitric acid Answer :C

Discussion

3431.	Sodium reacts with oxygen to produce sodium oxide, which dissolves in water to form sodium hydroxide. On adding hydrochloric acid to the base solution, salt and water are produced. Write balanced chemical equations to represent all the reactions stated in the question.
Answer» SOLUTION :(i) `2Na+O_(2)toNa_(2)O` (II) `Na_(2)O+H_(2)Oto2NaOH` (iii) `NaOH+HCl toNaCl+H_(2)O`

Discussion

3432.	Sodium, Lithium , Copper , Beryllium
Answer» Solution :COPPER : OTHERS are normal elements, while copper is a TRASITION ELEMENT.

Discussion

3433.	Sodium is the eighth element after lithium.
Answer» ANSWER :TRUE

Discussion

3434.	Sodium is a
Answer» SILVERY white and very SOFT METAL COLOURLESS and hard metal silvery white and very hard metal colourless and very soft metal ANSWER :A

Discussion

3435.	Sodium is a metal of ____ melting point, but diamond is a noometal of _____melting points.
Answer» SOLUTION :LOW, HIGH

Discussion

3436.	Sodium hydroxide is prepared by chlor-alkali process. (True or False)
Answer» ANSWER :T

Discussion

3437.	Sodium hydroxide and hydrochloric acid react as shown in this equation. NaOH_((aq))+HCl_((aq))toNaCl_((aq))+H_(2)O_((I)) (i)Which type of chemical reaction in this? (ii)The reaction is exothermic .Explain what that means. (iii)Differentiate exothermic reaction and endothermic reaction. (iv)What happens to the temprature of the solution as the solution as the chemicals react?
Answer» Solution :(i)It ISO neutralisation reaction. (ii)Exothermic reaction is a chemical reaction in which evolution of HEAT energy takes place. (iii) (IV)When NaOH reacts with HCl to give NaCl and water ,heat is evolved.So the solution.s temprature INCREASES.

Discussion

3438.	Sodium hydroxide cannot be stored in aluminium container as aluminium reacts with sodium hydroxide to form
Answer» SODIUM hexa aluminate sodium OCTA aluminate sodium META aluminate sodium aluminate Answer :D

Discussion

3439.	Sodium hydroxide is
Answer» a BASE an acid an ALKALI both base as WELL as alkali ANSWER :D

Discussion

3440.	Sodium hydrogencarbonate is used in fire extinguishers.
Answer» SOLUTION :NA

Discussion

3441.	Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved? (i) It turns lime milky (ii) It extinguishes a burning splinter (iii) It dissolves in a solution of sodium hydroxide (iv) It has a pungent odour.
Answer» (i) and (ii) (i), (ii) and (iii) (ii), (iii) and (IV) (i) and (iv) Solution :When sodium hydrogen carbonate is added to acetic acid then carbon DIOXIDE `(CO_(2))` GAS is evolved. `NaHCO_(3)+CH_(3)COOHrarrCH_(3)COONa+CO_(2)+H_(2)O` `CO_(2)` turns lime water milky it is a non supporter of combustion and is absorbed by strong ALKALIES like NaOH.

Discussion

3442.	Sodium hydrogencarbonate is used as an_______
Answer» SOLUTION :ANTACID

Discussion

3443.	Sodium hydrogen carbonate is a basic salt. Justify the statement how is it converted into washing soda? Explain.
Answer» Solution :SODIUM hydrogen CARBONATE is a salt of sodium HYDROXIDE ( strong base) and carbonic acid ( weak acid). It is basic salt. It is converted into washing soda by heating followed by crystalization . `2NaHCO_(3) (AQ) overset("heat")to Na_(2)CO_(3)CO + H_(2)O`

Discussion

3444.	Sodium ethanoate when heated withsodalime gives methane.
Answer» ANSWER :T

Discussion

3445.	Sodium chloride was taken in a test tube and conc. H_2SO_4 acid added to it and the gas was tested with a moist litmus paper. Give your observation.
Answer» The paper got bleached. The paper caught fireq Nothing HAPPENED to the paper. The paper turned RED. Solution :The paper turned red due to the evolution of HCl gas.

Discussion

3446.	Sodium chloride itself is not deliquescent, but it absorbs moisture when exposed to air. Why ?
Answer» Solution :SODIUM CHLORIDE is mixed with a SMALL amount of magnesium chloride ` (MgCI_(2))` which absorbs moisture.

Discussion

3447.	Sodium chloride is added to the solution after Saponification to cause the
Answer» hydrolysis of soap precipitation of soap sedimentation of soap none of these SOLUTION :Soap is a colloidal solution. Sodium CHLORIDE is ADDED to increase precipitation of soap.

Discussion

3448.	Sodiumchloridedecomposesintometallicsodiumandchlorinegasby aprocesscalled ______.
Answer» SOLUTION :ELECTROLYSIS

Discussion

3449.	Sodium chloride dissolved in water forms a non-aqueous solution.
Answer» Solution :Correct Statement: Sodium chloride dissolved in WATER FORMS a aqueous solution.

Discussion

3450.	Sodium chloride always contains water of crystallization .
Answer» ANSWER :F

Discussion

Explore topic-wise InterviewSolutions in .

Some batteries are rechargeable, whereas others must be thrown away after they get discharged. Justify with respect to the concept of electrochemical cells.

Some articles made of silver, copper and iron get coloured coating over them when they are exposed to air . Identify the colour andchemical name of the substance of coating in each case.

Solutions which contain three components are called binary solution.

Solutions A and B have pH 5 and 10 respectively . Which one of these solutions is alkaline?

Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution is a strong acid?

Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution will liberate ammonia from ammonium sulphate on heating?

Solution of sulphur in CS_2 is a suitable example for non-aqueous solution.

Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2. Which solution contains solute molecules as well as ions?

solution of SO_(2) gasin water is acidic due to the formation of

Solution is madefrom 35 mlof Methanoland 65mlof water. Calculatethe volumepercentage.

Solution has a pOH of 11.76 What is the pH of this solution?

Solution A is a strong acid Solution B is a weak alkali Solution C is a strong alkali Which solution contains solute molecules in addition to water molecules ?

Solution A is a sodium hydroxide solution. Solution B is a weak acid. Solution C is dilute sulphuric acid. Which solution will (i) liberate sulphur dioxide from sodium sulphite? (ii) give a white precipitate with zinc sulphate solution? (iii) contain solute molecules and ions?

Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B and which one of the solutions A and B will have a higher pH value ?

Solubility of oxygen is more in cold water.

Solubility of KNO_3 increases with the ........... in temperature

Solubility of KNO_3 in water is ......process.

Solubility of CuSO_4 , in H_2 O is 36g at 25^@ C.

Solubility of CaO increases with the increase in temperature.

Solubility of CaO decreases with the .................. in temperature.

Solubility of CaO in water is ......... process.

Solubilityof a solidsoluteis a liquidsolventincreaseswithincrease in_______.

Solubility is equal to .......

Solid calcium oxide was taken in a container and water was added slowly to it. (i) State the two observations made in the experiment. (ii) Write the name and chemical formula of the product formed.

Solder is an alloy of ......... and........

Solder is an alloy of

Solar energy is used in homes and offices for ____ purposes.

Soil is an example of

Soft drinks contains

Sodium reacts with oxygen to produce sodium oxide, which dissolves in water to form sodium hydroxide. On adding hydrochloric acid to the base solution, salt and water are produced. Write balanced chemical equations to represent all the reactions stated in the question.

Sodium, Lithium , Copper , Beryllium

Sodium is the eighth element after lithium.

Sodium is a

Sodium is a metal of ____ melting point, but diamond is a noometal of _____melting points.

Sodium hydroxide is prepared by chlor-alkali process. (True or False)

Sodium hydroxide cannot be stored in aluminium container as aluminium reacts with sodium hydroxide to form

Sodium hydroxide is

Sodium hydrogencarbonate is used in fire extinguishers.

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved? (i) It turns lime milky (ii) It extinguishes a burning splinter (iii) It dissolves in a solution of sodium hydroxide (iv) It has a pungent odour.

Sodium hydrogencarbonate is used as an_______

Sodium hydrogen carbonate is a basic salt. Justify the statement how is it converted into washing soda? Explain.

Sodium ethanoate when heated withsodalime gives methane.

Sodium chloride was taken in a test tube and conc. H_2SO_4 acid added to it and the gas was tested with a moist litmus paper. Give your observation.

Sodium chloride itself is not deliquescent, but it absorbs moisture when exposed to air. Why ?

Sodium chloride is added to the solution after Saponification to cause the

Sodiumchloridedecomposesintometallicsodiumandchlorinegasby aprocesscalled ______.

Sodium chloride dissolved in water forms a non-aqueous solution.

Sodium chloride always contains water of crystallization .

Sodium is a metal of melting point, but diamond is a noometal of _melting points.