8881 + Interview Questions in Chemistry in Class 10 Page 35 InterviewSolution

1701.	What are the values of 'n' for the shells K, L and M?
Answer» SOLUTION :K -1L -2M -3

Discussion

1702.	What would you observe when zinc is added to a solution of iron (II) sulphate ? Write the chemical reaction that take place
Answer» Solution :When zinc is added to IRON (II) sulphate, then it will DISPLACE the iron from iron sulphate solution. `ZN(s) + FeSO_(4)(AQ) rarr ZnSO_(4)(aq) + Fe(s)`

Discussion

1703.	What happens when iron nail is placed in silver nitrate solution? (ii)iron strip is dipped in zinc sulphate solution?
Answer» Solution :Iron is more reactive than silver `Fe(s)+2AgNO_3(AQ) to Fe(NO_3)_2(aq)+2Ag(s)` (ii)Iron is below zinc in the reactivity series, therefore iron cannot displace zinc from zinc sulphate solution. No REACTION TAKES PLACE.

Discussion

1704.	What is the nature of the solution obtained when carbon dioxide gas is passed into water ?
Answer» SOLUTION :ACIDIC .

Discussion

1705.	Which are the chemicals required for the preparation of ammonia in the laboratory?
Answer» ANSWER :`NH_4Cl` and `(CA(OH)_2)`

Discussion

1706.	Which of the following molecule involves electrovalent bond?
Answer» `H_(2)` `CH_(4)` `CaCl_(2)` `HCl` Solution :`CalCl_(2)` consists of `Ca^(2+)` and ` Cl^(-)` ions. Formation of these ions INVOLVES TRANSFER of electron. Hence, `CaCl_(2)` is an electrovalent COMPOUND.

Discussion

1707.	Which of the following metals will melt at body temperature? Gallium,Magnesium,Caesium,Aluminium
Answer» SOLUTION :Gallium and caesium will melt at `37^@C` (BODY temperature)

Discussion

1708.	Write the brominationreactions of ethene
Answer» SOLUTION :`CH_2 = CH_2 + BR- Br to BrCH_2 - CH_2Br`

Discussion

1709.	Write the balanced equations for the reaction of copper and aluminium, when heated in air. State the names of the products obtained.
Answer» Solution :`UNDERSET("copper")(2CU(s)) + O_2(G)to underset("copper (II) OXIDE")(2CuO(s))` `underset("aluminium")(4Al(s)) + 3O_2(g) to underset("aluminium (III) oxide")(2Al_2O_3(s))`

Discussion

1710.	While cooking, if the bottom of the vessel is getting blackened on the outside, it means that …
Answer» the found is not cooked COMPLETELY. the fuel is not BURNING completely. the fuel is WET. the fule is burning completely. Solution :the fuel is not burning completely.

Discussion

1711.	What is the chemical name of common salt ?
Answer» SOLUTION :The CHEMICAL name of COMMON SALT is sodium chloride (NACI)

Discussion

1712.	The shape of XeF4 molecule according to VSEPR theory is
Answer» SQUARE PLANAR Square PYRAMID TETRAHEDRAL Pyramidal Answer :A

Discussion

1713.	X+CuSO_(4)toXSO_(4)+Cu, Y+CuSO_(4)toYSO_(4)+Cu, in these reactions X and Y may be ______ .
Answer» Zn, Ag Zn, FE Fe, Ag Ag, Al Solution :Zn and Fe are more reactive than copper.

Discussion

1714.	You have two solutions 'A' and 'B'. The pH of solution 'A' is 6 and pH of solution 'B' is 8. Which solution has more hydrogen ion concentration ? Which of this is acidic and which one is basic ?
Answer» Solution :A solution having pH LESS than 7 is ACIDIC while that having pH more than 7 is BASIC. Consequently, .A. is acidic and .B. is basic. Naturally .A. which is acidic has greater concentration of HYDROGEN ion concentration.

Discussion

1715.	What are the types of matter?
Answer» SOLUTION :There are THREE types of MATTERS viz elements, COMPOUNDS and MIXTURES.

Discussion

1716.	What is redox reactions ? Identity the substance oxidised and the substance reduced in the following reactions : PbO+C to 2Pb+CO_(2)
Answer» SOLUTION :Chemical REACTION in which both oxidation and REDUCTION takes place simultaneously are called Redox reactions. `PbO` is reduced to `Pb` and C is oxidised to `CO_(2)`

Discussion

1717.	Which of the following reactions is oxidation and which is reduction ? "(a) "2Cu+O_(2)to2CuO"(b) "CuO+H_(2)overset("Heat")(to)Cu+H_(2)O
Answer» Solution :REACTION (a) REPRESENTS OXIDATION while reaction (b) represents REDUCTION.

Discussion

1718.	Which one is a chemical change - rusting or iron or melting of ice ?
Answer» SOLUTION :RUSTING of IRON.

Discussion

1719.	What is hydrogenation ? What is its industrial application ?
Answer» SOLUTION :Hydrogenation is addition of hydrogen in the presence of nickel CATALYST, to unsaturated hydrocarbons, to form saturated hydrocarbons. The industrial APPLICATION is the conversation of VEGETABLE oil into fats/vanaspathi GHEE.

Discussion

1720.	What are micelles? How is it formed when soap is added to water? Will a micelle be formed in other solvents such as ethanol also? State briefly how the formation of micelles helps to clean the clothes having oily spots.
Answer» Solution :Micelle formation will not occur in ethanol because HYDROCARBON CHAIN END of the soap will dissolve in ethanol. As a result, EMULSION will not be formed.

Discussion

1721.	What are indicators ?
Answer» SOLUTION :SUBSTANCES used to find out pH of a solution are CALLED indicators

Discussion

1722.	What will happen if a solution of sodium hydrogencarbonate is heated ? Give the equation of the reaction involved .
Answer» SOLUTION :Sodium hydrogencarnonate on heating DECOMPOSES to give sodium carbonate , carbon dioxide and water . `underset("hydrogencarbonate")(underset("Sodium")(2NaHCO_3))rarrunderset("carbonate")(underset("Sodium")(Na_(2)CO_(3)))+underset("dioxide")(underset("Carbon")(CO_2))+underset("Water")(H_2O)`

Discussion

1723.	Which of the following oxides when dissolved in water gives a solution which turns blue litmus red?
Answer» `MgO` `CaO` `CO_2` `CuO` SOLUTION :MgO, CaO and CuO and all METAL oxide. Metal oxides are basic in nature. `CO_2` is a non-metal oxide and its AQUEOUS solution turns blue LITMUS red.

Discussion

1724.	What effect does the concentration of H^(+) (aq) ions have on the acidic nature of the solution ?
Answer» Solution :Water contains EXACTLY the same number of `H^(+) and OH^(-)` ions. ACIDIC solution contains more acidic is the solution .

Discussion

1725.	When a flower bleached by sulphur dioxide is brought in contact with air and light
Answer» the FLOWER BECOMES RED the flower becomes red the flower of the flower is restored none of the above happens ANSWER :C

Discussion

1726.	Which one of the following does not react with copper ?
Answer» Oxygen CONC. `H_(2)SO_(4)` NaOH Conc.`HNO_(3)` ANSWER :C

Discussion

1727.	Write the IUPAC name of the compound CH_3 - C -= CH .
Answer» Solution : There are 3 C atoms in the CHAIN involving triple bond, therefore, the root word is .prop.. There is a triple bond in the chain, therefore, primary suffix is .yne.. Thus, the IUPAC name of the GIVEN compound is Root word + Primary suffix Prop + yne = Propyne

Discussion

1728.	What would you observe, when zinc, is added to a solution of iron (II) sulphate?Write the chemical reaction that takes place.
Answer» Solution :When zinc is added to a solution of iron (II) sulphate, the greenish colour of iron (II) sulphate solution fades away gradually, DUE to the formation of colourless zinc sulphate solution. Iron metal is deposited on zinc. `ZN(s)_(Zi NC)+FeSO_4(aq)_(Iron II Su lpha te(Greenish solution))toZnSO_4(aq)_(Zi nc Su lpha te (Colour L ess solution ))+Fe(s)_(Iron)`

Discussion

1729.	What is an alloy ?
Answer» SOLUTION :An ALLOY is a homogeneousmixureof two or more METALS or OFONE ORE moremetals with certain non-metallicelements .

Discussion

1730.	What is the pH of an alkaline solution ?
Answer» SOLUTION :The PH of an ALKALINE solution is more than 7.

Discussion

1731.	The structure of two organic compounds are given below: i) CH_3-CH_2-CH_2-CH_2-OH ii) CH_3-CH_2-O-CH_2-CH_3 Explain this isomerism.
Answer» Answer :Compounds having same MOLECULAR FORMULA and DIFFERENT structural formula and FUNCTIONAL GROUPS are called functional group isomers.

Discussion

1732.	Write the chemical equation of the reaction in which the following changes have taken place : (i) Change in colour (ii) Change in temperature Formation of precipitate.
Answer» Solution :Chemical equations corresponding to different changes are given below : (i) Change in colour `Fe+underset("BLUE")(CuSO_(4))tounderset("GREEN")(FeSO_(4))+Cu` (ii) Change in temperature `underset("CALCIUM OXIDE")(CaO)+H_(2)O to underset("Hydroxide")underset("Calcium")(Ca(OH)_(2))+"HEAT"` (iii) Formation of precipitate `BaCl_(2)+Na_(2)SO_(4) to underset("White ppt.")(BaSO_(4))+2NaCl`

Discussion

1733.	Which metal floats on water ?
Answer» SOLUTION : CALCIUM and MAGNESIUM FLOAT on WATER.

Discussion

1734.	What type of reaction does occur in the following ? Fe_(2)O_(3)(s) + 2Al(s) to Al_(2)O_(3)(s) + 2Fe(l)
Answer» combination Displacement Decomposition Photochemical Answer :B

Discussion

1735.	Which one of the following is the correct sequence to get the IUPAC name of the compound?
Answer» Prefix + Root word + SUFFIX `rarr` IUPAC name Prefix + Suffix + Root word `rarr` IUPAC name Suffix + Root word + Prefix `rarr` IUPAC name Root word + Prefix + Suffix `rarr` IUPAC name ANSWER :A

Discussion

1736.	Which one of the following is a saturated hydrocarbon?
Answer» PROPENE PROPYNE Ethene Butane ANSWER :D

Discussion

1737.	What would be the electron dot structure of carbon dioxide which has the formula CO_(2) ?
Answer» SOLUTION :The electronic configuration of CARBON and OXYGEN are as follows : Thus, carbon has 4 electrons and oxygen has 6 electrons in the VALENCE shell.

Discussion

1738.	Write symbols of cation and anion present in MgO. Why do ionic compounds have higher melting points ?
Answer» Solution :Cation : `Mg^(2+)` Anion : `O^(2-)` Ionic compounds have high melting POINT because cations and anions are HELD strong electrostatic FORCE of attraction and considerable amount of energy is required to BREAK the strong inter ionic FORCES.

Discussion

1739.	Which substance is reduced in the following reaction ? Reaction : 8Al+3Fe_(3)O_(4) to 4Al_(2)O_(3)+9Fe
Answer» Solution :In this reaction, OXYGEN is REMOVED from `Fe_(3)O_(4)`.Hence `Fe_(3)O_(4)` is reduced.

Discussion

1740.	Translate the following statements into chemical equations and then balance them : Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
Answer» Solution :`{:(" "BaCl_(2)(AQ)+Al_(22)(SO_(4))_(3)(aq)toAlCl_(3)(aq)+BaSO_(4)(s)"(Unbalanced equation)"),(3BaCl_(2)(aq)+Al_(2)(SO_(4))_(3)(aq)to2AlCl_(3)(aq)+3BaSO_(4)(s)"(BALANCED equation)"):}`

Discussion

1741.	What happens when (give balanced equations):Ethene reacts with chlorine.
Answer» SOLUTION :`CH_2 = CH_2 + CL - Cl to ClCH_2 - CH_2Cl`

Discussion

1742.	Which of the statement about the reaction below are incorrect ? 2PbO(s)+C(s) to 2Pb(s)+CO_(2)(g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c ) Carbon is getting oxidised. (d) Lead oxide is getting reduced.
Answer» (a) and (B) (a) and (C) (a),(b) and (c) all Answer :A

Discussion

1743.	Which metal burns easily in air?
Answer» SOLUTION :MAGNESIUM BURNS EASILY in AIR.

Discussion

1744.	What is meant by water table? Why is it important?
Answer» Solution :Water table : The level of water under the ground is called water table. Advantages of underground water are : Instead of evaporation, the stored underground water recharges the WELLS by spreading out. It ALSO provides moisture for vegetation over a wide area. It remains PROTECTED from contamination from animal and HUMAN wastes. It does not provide breeding ground for MOSQUITOES.

Discussion

1745.	What volume of 0.45 M H_(3)PO_(4) is needed to neutralise 60 mL of 0.60 N NaOH solution ? (Assume that there is a complete ionisation of acid and base)
Answer» Solution :(i) BALANCED equations and comparison of equivalents (ii) BASICITY of acid (iii) calculation of NORMALITY of `H_(3)PO_(4)` (iv) calculation of number of equivalents of base (v) calculation of volume of acid required based on normality of acid and number of equivalents of base (vi) 26.6 ml

Discussion

1746.	Which of the following electrolytes exhibits maximum conductivity ?
Answer» 1 M NaCl 1 M KCl `1 M CA(ON_(3))_(2)` 1 M `Al_(2) (SO_(4))_(3)` ANSWER :D

Discussion

1747.	Which gas burns with a pop sound?
Answer» Hydrogen Nitrogen Carbon dioxide Helium Answer :A

Discussion

1748.	What is observed when carbon dioxide gas is passed through lime water. (i) For a short duration (ii) For long durration ? Also write the chemicalequations forthe reaction involved.
Answer» Solution :(i) For short duration : Limewater turns MILKY due of FORMATION of `CaCO_(3)`, which iws INSOLUBLE in water . `underset (("Lime water"))(Ca(OH)_(2)(aq))+CO_(2)(g)rarr underset(("White ppt"))(CaCO_(3)(S)+)H_(2)O(l)` (ii) For Long duration : A clear solution is obtained due to formation of calcium bicarbonate, `Ca(HCO_(3))_(2)` which is soluble in water `CaCO_(3)(S)+H_(2)O(l)+CO_(2)(g)rarrCa(HCO_(3))_(2)(aq)`

Discussion

1749.	What isactivcationenergy ?
Answer» SOLUTION :The minimumenergy withwhichthe reactingparticlesmustcollideis called'ActivationEnergy' of THEREACTION .

Discussion

1750.	What is an amalgam? Give one example with its use .
Answer» Solution : * An amalgam is an alloy of MERCURY with metals such as sodium , gold and silver . * DENTAL amalgam is an alloy of MURCURY with silver and TIN and it is used in dental filling .

Discussion

Explore topic-wise InterviewSolutions in .

What are the values of 'n' for the shells K, L and M?

What would you observe when zinc is added to a solution of iron (II) sulphate ? Write the chemical reaction that take place

What happens when iron nail is placed in silver nitrate solution? (ii)iron strip is dipped in zinc sulphate solution?

What is the nature of the solution obtained when carbon dioxide gas is passed into water ?

Which are the chemicals required for the preparation of ammonia in the laboratory?

Which of the following molecule involves electrovalent bond?

Which of the following metals will melt at body temperature? Gallium,Magnesium,Caesium,Aluminium

Write the brominationreactions of ethene

Write the balanced equations for the reaction of copper and aluminium, when heated in air. State the names of the products obtained.

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that …

What is the chemical name of common salt ?

The shape of XeF4 molecule according to VSEPR theory is

X+CuSO_(4)toXSO_(4)+Cu, Y+CuSO_(4)toYSO_(4)+Cu, in these reactions X and Y may be ______ .

You have two solutions 'A' and 'B'. The pH of solution 'A' is 6 and pH of solution 'B' is 8. Which solution has more hydrogen ion concentration ? Which of this is acidic and which one is basic ?

What are the types of matter?

What is redox reactions ? Identity the substance oxidised and the substance reduced in the following reactions : PbO+C to 2Pb+CO_(2)

Which of the following reactions is oxidation and which is reduction ? "(a) "2Cu+O_(2)to2CuO"(b) "CuO+H_(2)overset("Heat")(to)Cu+H_(2)O

Which one is a chemical change - rusting or iron or melting of ice ?

What is hydrogenation ? What is its industrial application ?

What are micelles? How is it formed when soap is added to water? Will a micelle be formed in other solvents such as ethanol also? State briefly how the formation of micelles helps to clean the clothes having oily spots.

What are indicators ?

What will happen if a solution of sodium hydrogencarbonate is heated ? Give the equation of the reaction involved .

Which of the following oxides when dissolved in water gives a solution which turns blue litmus red?

What effect does the concentration of H^(+) (aq) ions have on the acidic nature of the solution ?

When a flower bleached by sulphur dioxide is brought in contact with air and light

Which one of the following does not react with copper ?

Write the IUPAC name of the compound CH_3 - C -= CH .

What would you observe, when zinc, is added to a solution of iron (II) sulphate?Write the chemical reaction that takes place.

What is an alloy ?

What is the pH of an alkaline solution ?

The structure of two organic compounds are given below: i) CH_3-CH_2-CH_2-CH_2-OH ii) CH_3-CH_2-O-CH_2-CH_3 Explain this isomerism.

Write the chemical equation of the reaction in which the following changes have taken place : (i) Change in colour (ii) Change in temperature Formation of precipitate.

Which metal floats on water ?

What type of reaction does occur in the following ? Fe_(2)O_(3)(s) + 2Al(s) to Al_(2)O_(3)(s) + 2Fe(l)

Which one of the following is the correct sequence to get the IUPAC name of the compound?

Which one of the following is a saturated hydrocarbon?

What would be the electron dot structure of carbon dioxide which has the formula CO_(2) ?

Write symbols of cation and anion present in MgO. Why do ionic compounds have higher melting points ?

Which substance is reduced in the following reaction ? Reaction : 8Al+3Fe_(3)O_(4) to 4Al_(2)O_(3)+9Fe

Translate the following statements into chemical equations and then balance them : Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

What happens when (give balanced equations):Ethene reacts with chlorine.

Which of the statement about the reaction below are incorrect ? 2PbO(s)+C(s) to 2Pb(s)+CO_(2)(g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c ) Carbon is getting oxidised. (d) Lead oxide is getting reduced.

Which metal burns easily in air?

What is meant by water table? Why is it important?

What volume of 0.45 M H_(3)PO_(4) is needed to neutralise 60 mL of 0.60 N NaOH solution ? (Assume that there is a complete ionisation of acid and base)

Which of the following electrolytes exhibits maximum conductivity ?

Which gas burns with a pop sound?

What is observed when carbon dioxide gas is passed through lime water. (i) For a short duration (ii) For long durration ? Also write the chemicalequations forthe reaction involved.

What isactivcationenergy ?

What is an amalgam? Give one example with its use .