8881 + Interview Questions in Chemistry in Class 10 Page 135 InterviewSolution

6701.	Decomposition of __________ to calcium oxide and carbon dioxide is used in various industries.
Answer» SOLUTION :CALCIUM CARBONATE

Discussion

6702.	Decomposition of phosphorous pentachloride is an example of ________ equilibria.
Answer» ANSWER :HOMOGENEOUS

Discussion

6703.	Decomposition of silver chloride takes place in
Answer» ELECTROLYSIS sunlight HEATING cooling ANSWER :B

Discussion

6704.	Decomposition of molecule occurs on passing electric current through its aqueous solution.This process is termed as….
Answer» Thermolysis Photolysis Electrolysis None of these Answer :ELECROLYSIS

Discussion

6705.	Decomposition of a compound can take place by which of the following ways?
Answer» Heat Light Electricity All of the above Answer :D

Discussion

6706.	Decomposers of ecosystem consists of
Answer» Organisms which MAKE organic COMPOUND out of inorganic compounds Organisms which use radiant energy to PRODUCE biomass Certain blue green algae and algae Certain fungi and bacteria. Answer :D

Discussion

6707.	Decolourisation of bromine takes place in saturated compounds.
Answer» Solution :Decolourisation of BROMINE TAKES PLACE in unsaturated compounds.

Discussion

6708.	Decolourisation of bromine take place in………………..
Answer» `CH_(2)=CH_(2)` `CH_(4)` `CH_(3)-CH_(3)` `CH_(3)-CH_(2)OH` ANSWER :A

Discussion

6709.	Decarboxylation of ethanoic acid is……………….
Answer» ETHANE Methane Propane Ethanol ANSWER :B

Discussion

6710.	Decarboxylation is removal of…………………
Answer» CO `CO_(2)` `H_(2)` `CO_(3)^(-)` ANSWER :B

Discussion

6711.	Dead burnt plaster is
Answer» `CaSO_(4)` `CaSO_(4).1/2H_(2)O` `CaSO_(4).H_(2)O` `CaSO_(4).2H_(2)O` Solution :`UNDERSET("Gypsum")(CaSO_(4).2H_(2)O)OVERSET(120^(@)C)(to)underset("dead BURNT plaster")underset(CaSO_(4))underset(darrTgt120^(@)C)underset("plaster of paris")(CaSO_(4).1//2H_(2)O)`

Discussion

6712.	Dams are built to run thermal power plants.
Answer» ANSWER :F

Discussion

6713.	Dalton's law of partial pressures cannot hold good for
Answer» `NO_(2) + O_(2)` `H_(2) + Cl_(2)` `CO_(2) + O_(2)` `NH_(3) + He` Answer :B

Discussion

6714.	Dalton, Dobereiner , Moseley , Newlands
Answer» Solution :Dalton : He put FORTH the Dalton.s theory for ATOMIC structure, whereas all others classified ELEMENTS.

Discussion

6715.	CuSO_(4).5H_(2)O becomes anhydrous CuSO_(4) on heating. This property of losing water molecules of crystallisationis known as
Answer» deliquescence dehydration efflorescence hydrolysis Answer :C

Discussion

6716.	Curd is sour in taste due to the presence of an acidic substance.
Answer» ANSWER :1

Discussion

6717.	Curd and sour substances should not be kept in glass and plastic containers.
Answer» Solution :False – They should not be KEPT in brass and COPPER CONTAINERS.

Discussion

6718.	CuO + H_(2) rarr Cu + H_(2) O (i) in this reaction name the reaction : (ii) that is reduced.
Answer» SOLUTION :(i) HYDROGEN is oxidised (II) CUO is REDUCED

Discussion

6719.	Cu_2O, Cu_2S, Al_2O_3 , CuFeS_2
Answer» SOLUTION :`Al_2O_3`

Discussion

6720.	Crystals of ferrous sulphate when exposed to air become
Answer» red brown colourless black Answer :B

Discussion

6721.	Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down. (i) Name one such substance. (ii) Explain the phenomenon involved.
Answer» Solution :`(i) CuSO_4. 5H_2O` `CuSO_4. 5 H_2Oto ^(Delta)CuSO_4\|5H_2O` (BLUE) (White) (ii) Explanation: On heating crystals LOSSES water of CRYSTALLISATION and REGAIN it on COOLING.

Discussion

6722.	Critical temperatures of thegases A, B, C and D are (a) 5.2 K(b) 33.2K (c ) 126.3 K(d)191.1 K Arrange them in theascending orderof intermolecular forces of attraction.
Answer» C,B,D,A A,B, C,D D,C,B,A A,C,B,D Answer :B

Discussion

6723.	C_(P) - C_(V) =…..
Answer» ANSWER :R

Discussion

6724.	Coversion of bauxite into alumina is ……….
Answer» HALL's PROCESS ALUMINA THERMIC process Baeyer's process Answer :C

Discussion

6725.	Covalent compounds have low melting points because
Answer» ANSWER :F

Discussion

6726.	Covalent compounds are soluble in water.
Answer» SOLUTION :Correct statement: COVALENT COMPOUNDS are insoluble in WATER.

Discussion

6727.	Corrosiveaction in the presence of moisture is called ___________.
Answer» SOLUTION :WET CORROSION

Discussion

6728.	Corrosion of iron can be prevented by
Answer» HEATING melting PAINTING GALVANISING Answer :C

Discussion

6729.	Corrosion is a serious problem. Every year an enormous amount of money is spend to replace damaged iron. What steps can be taken to prevent this damage ?
Answer» SOLUTION :The rusting of IRON can be prevented by painting, oiling, greasing, galvanizing, CHROME plating anodizing or MAKING alloys.

Discussion

6730.	Corrosion causes damage to car bodies, bridges, railways and ships.
Answer» SOLUTION :This is because IRON is CONVERTED to iron OXIDE.

Discussion

6731.	Corrosion can be prevented by many ways. Whatis the used of coating with paints ?
Answer» SOLUTION :PAINT coated METALS surface KEEP out air and moisture.

Discussion

6732.	Copy and complete the following sentences : With platinum electrodyes , hydrogen is liberated at the _______ and oxygen at the_______ during the electrolysis of acidified water :
Answer» Solution :With platinum ELECTRODES , HYDROGEN is LIBERATED at the cathode and OXYGEN at the anode during the electrolysis of a clasified water .

Discussion

6733.	Copy and Complete the following table which refers to two practical applications of electrolysis .
Answer» SOLUTION :

Discussion

6734.	Copy and complete the following sentence:A saturated hydrocarbon will undergo _____reactions, whereas the typical reaction of an unsaturated hydrocarbon is_____.
Answer» Solution : A SATURATED HYDROCARBON will UNDERGO substitution REACTIONS, whereas the typical reaction of an UNSATURATED hydrocarbon is addition.

Discussion

6735.	Copper when exposed to air for a long time acquire a green coat . Why ?
Answer» SOLUTION :Because when COPPER reacts with MOIST carbon dioxide in the air and slowly loses its shiny brown surface and GAINS a GREEN coat . This green substance in basic copper carbonate .

Discussion

6736.	Coppervessels getscovered with a greenlayer . Explain .
Answer» Solution :Action of AIRAND MOISTURE : Coppergets covered with a GREEN LAYER of basic copper carbonate in the presence of CO and moisture . ` 2Cu+O_2+CO_2+H_2O to CuCO_3 * Cu(OH)_2`

Discussion

6737.	copper sulphate solution changes its blue colour into…….colour when iron nail isadded to it and it acquires……….colour.
Answer» SOLUTION :GREEN,BROWNISH

Discussion

6738.	State whether the following statement is true of false: Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
Answer» ANSWER :T

Discussion

6739.	Copper , silver and gold are called coinage metals .
Answer» SOLUTION :N/A

Discussion

6740.	Copper , silver and gold are called …………… as they are used in making …………….and …………… .
Answer» SOLUTION : COINAGE METALS , COINS JEWELLERY

Discussion

6741.	Copper reacts with conc.HNO_(3) top form copper nitrate, water and gives brown fumes of nitrogen oxide and the name of the reaction is
Answer» `NO_(2)`, combination REACTION NO, REDOX reaction `NO_(2)`, redox reaction `N_(2)O` combination reaction Answer :C

Discussion

6742.	Copper pyrit ore is concentrated by gravity separation method .
Answer» Solution :COPPER pyrite ORE is CONCENTRATED by FROTH floatation process.

Discussion

6743.	Copper is more reactive than iron.
Answer» ANSWER :F

Discussion

6744.	Copper is a good conductor of electricity but it is not considered as an electrolyte .Why ?
Answer» SOLUTION :Because Cu/does not GIVE CATIONS and ANIONS .

Discussion

6745.	Copper (I) and silver (I) halides are more covalent in nature compared to sodium and potassium halides although the charges on the ions are same. How do you account for this?
Answer» SOLUTION :(i) size of the CATION (ii) comparison of the size of the alkali METALS and transition metals belonging to the same group (iii) EFFECT of size on the polarizing power of the cation (iv) relation between the polarizing power of the cation and the covalent CHARACTER of the compound.

Discussion

6746.	Copper does not react with dilute hydrochloric acid (HCI). Why?
Answer» Solution : Since copper is not an ACTIVE metal LIKE NA, K, Zn, ETC. it does not react with dilute hydrochloric ACID (HCI).

Discussion

6747.	Copper can be displaced from aqueous solution of copper sulphate by adding
Answer» AG Au Hg FE SOLUTION :Only Zn is more REACTIVE than Cu.

Discussion

6748.	coordination number of Tetrahedral void is
Answer» 1 2 3 4 Answer :D

Discussion

6749.	coordination number of Octahedral void is
Answer» 1 4 2 6 Answer :D

Discussion

6750.	Coordination no. of atom in 2-D square closed packing is
Answer» 4 2 3 6 Answer :A

Discussion

Explore topic-wise InterviewSolutions in .

Decomposition of __________ to calcium oxide and carbon dioxide is used in various industries.

Decomposition of phosphorous pentachloride is an example of ________ equilibria.

Decomposition of silver chloride takes place in

Decomposition of molecule occurs on passing electric current through its aqueous solution.This process is termed as….

Decomposition of a compound can take place by which of the following ways?

Decomposers of ecosystem consists of

Decolourisation of bromine takes place in saturated compounds.

Decolourisation of bromine take place in………………..

Decarboxylation of ethanoic acid is……………….

Decarboxylation is removal of…………………

Dead burnt plaster is

Dams are built to run thermal power plants.

Dalton's law of partial pressures cannot hold good for

Dalton, Dobereiner , Moseley , Newlands

CuSO_(4).5H_(2)O becomes anhydrous CuSO_(4) on heating. This property of losing water molecules of crystallisationis known as

Curd is sour in taste due to the presence of an acidic substance.

Curd and sour substances should not be kept in glass and plastic containers.

CuO + H_(2) rarr Cu + H_(2) O (i) in this reaction name the reaction : (ii) that is reduced.

Cu_2O, Cu_2S, Al_2O_3 , CuFeS_2

Crystals of ferrous sulphate when exposed to air become

Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down. (i) Name one such substance. (ii) Explain the phenomenon involved.

Critical temperatures of thegases A, B, C and D are (a) 5.2 K(b) 33.2K (c ) 126.3 K(d)191.1 K Arrange them in theascending orderof intermolecular forces of attraction.

C_(P) - C_(V) =…..

Coversion of bauxite into alumina is ……….

Covalent compounds have low melting points because

Covalent compounds are soluble in water.

Corrosiveaction in the presence of moisture is called ___________.

Corrosion of iron can be prevented by

Corrosion is a serious problem. Every year an enormous amount of money is spend to replace damaged iron. What steps can be taken to prevent this damage ?

Corrosion causes damage to car bodies, bridges, railways and ships.

Corrosion can be prevented by many ways. Whatis the used of coating with paints ?

Copy and complete the following sentences : With platinum electrodyes , hydrogen is liberated at the _______ and oxygen at the_______ during the electrolysis of acidified water :

Copy and Complete the following table which refers to two practical applications of electrolysis .

Copy and complete the following sentence:A saturated hydrocarbon will undergo _____reactions, whereas the typical reaction of an unsaturated hydrocarbon is_____.

Copper when exposed to air for a long time acquire a green coat . Why ?

Coppervessels getscovered with a greenlayer . Explain .

copper sulphate solution changes its blue colour into…….colour when iron nail isadded to it and it acquires……….colour.

State whether the following statement is true of false: Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.

Copper , silver and gold are called coinage metals .

Copper , silver and gold are called …………… as they are used in making …………….and …………… .

Copper reacts with conc.HNO_(3) top form copper nitrate, water and gives brown fumes of nitrogen oxide and the name of the reaction is

Copper pyrit ore is concentrated by gravity separation method .

Copper is more reactive than iron.

Copper is a good conductor of electricity but it is not considered as an electrolyte .Why ?

Copper (I) and silver (I) halides are more covalent in nature compared to sodium and potassium halides although the charges on the ions are same. How do you account for this?

Copper does not react with dilute hydrochloric acid (HCI). Why?

Copper can be displaced from aqueous solution of copper sulphate by adding

coordination number of Tetrahedral void is

coordination number of Octahedral void is

Coordination no. of atom in 2-D square closed packing is

Copy and complete the following sentences : With platinum electrodyes , hydrogen is liberated at the _ and oxygen at the_ during the electrolysis of acidified water :

Copy and complete the following sentence:A saturated hydrocarbon will undergo _reactions, whereas the typical reaction of an unsaturated hydrocarbon is_.