94420 + Interview Questions in Chemistry in Class 12 Page 20 InterviewSolution

951.	Thiokol is used as
Answer» rubber for makinghuman hair WIGS HELMETS bullet proof WINDOWS Answer :A

Discussion

952.	Which metal has a greater tendency to form metal oxide ?
Answer» AL Ca Cr Fe Solution :The formation and STABILITY of metal OXIDES can be explained on the basis of lattice ENERGY effects . `Al^(3+)` ion being a small ion has strong positive field around it and can stabilise `O^(2)` BETTER.

Discussion

953.	The reagent (X) in the given reaction is phenol underset(273K)overset("''X''")(rarr) Parabromophenol
Answer» `Br_(2)//CH_(3)COOH` `Br_(2)//FeBr_(3)` Bromine water `Br_(2)//CS_(2)` Answer :D

Discussion

954.	Three arrangements are shown for the complex [Co(e n) (NH_(3))_(2)Cl_(2)]^(+)pick up the correct statement:-
Answer» II and III are optical isomers I & III are optical isomers I & II ONE geometrical isomers II & III are geometrical isomers Solution :(i) I & II are G.I. (ii) II & III are optical isomer

Discussion

955.	Which one of the following is / true :- (i) At critical temp the surface separating two phases disappears (ii) below critical temperature a gas is called vapour (iii) A gas can't be liquified below critical temp. (iv) Higher the critical temp. difficult to liquify a gas
Answer» (i),(II),(IV) (i),(ii),(iv) (III),(iv) (i),(ii) ANSWER :D

Discussion

956.	The solubility of AgCl will be minimum in……….
Answer» `0.001 M AgNO_3` PURE water `0.01 M CaCl_2` `0.01 M NACL` Solution :`0.01M CaCl_2` gives maximum `Cl^-` ions to keep `K_(sp)` of AGCL constant, decreases in `[Ag^+]` will be maximum.

Discussion

957.	The stability of coordination compounds is related to ______ , ______ and exotropy terms.
Answer» ANSWER :GIBB's ENERGY, ENTHALPY

Discussion

958.	Which of the following dimensions of a unit cell represent a cubic unit
Answer» `a=b=c,alpha=BETA=GAMMA=90^(@)` `a=b=c,alpha=beta=90^(@)NE gamma` `a=bnec, alpha=gamma=90^(@)` `anebnec,alphane beta ne gamma` ANSWER :A

Discussion

959.	Which is not poisonous ?
Answer» `NH_3` `PH_3` `AsH_3` `SbH_3` ANSWER :A

Discussion

960.	Which one of the following platinum complexes is used in cancer chemotherapy?
Answer» CIS[`PtCl_(2)(NH_(3))_(2)]` trans-`[PtCl_(2)(NH_(3))]` `{t(NH_(3))_(4)]^(2+)` `[Pt(Cl_(4))]^(2-)` ANSWER :A

Discussion

961.	Which of the following compounds has highest boiling point ?
Answer» Propan-1-ol n-Butane Chloroethane Propanal ANSWER :A

Discussion

962.	Which statement is false.
Answer» `NH_3` is a LEWIS base `NH_3` molecule is triangular planar `NH_3` does not ACT as reducing AGENT `NH_3` (liquid) is used as a solvent Answer :B

Discussion

963.	What is HDPE? Give its preparation and use.
Answer» Solution : (i) HDPE is high density polyethylene. It is prepared by the POLYMERISATION of ethylene at 373k and 6 to 7 ATM. USING zeiglar Natta Catalyst) `underset([TiCl_4 + (C_2H_5)_3 AL])(nCH_2=CH_2 underset(6-7 "atm. Pr.")overset(373K)to (--CH_2 -CH_2--)_n)` (iii) It is used to make bottles, pipes.

Discussion

964.	Which of the following rubber if not a polydiene
Answer» POLYISOPRENE POLYCHLOROPRENE Thiokolrubber Synthesiezer ANSWER :C

Discussion

965.	You are required to match all the metallurgical extractions given in column-I with the processes given in column-II. {:("Column-I","Column-II"),("(Metallurgical extraction)","(Process involved in metallurgical extraction)"),((A)Al_2O_3. 2H_2OtoAl,(p)"Leaching"),((B)KCl.MgCl_2. 6H_2O,(q)"self reduction"),((C )Ag_2S to Ag,(r)"Electrolytic reduction(molten state)"),((D)PbStoPb,(s)"Roasting"),(,(t)"Displacement method"):}
Answer» Solution :(A)`Al_2O_3(s)+3H_2O(l)+2NAOH(aq)to2Na[Al(OH)_4](aq)` `2Na[Al(OH)_4](aq)+CO_2(g)toAl_2O_3 xH_2O(s)+2NaHCO_3`(aq) `Al_2O_3 xH_2O(s)overset(1470K)toAl_2O_3(s)+xH_2O(g)` ELECTROLYTIC reduction of molten pure `Al_2O_3` mixed with `Na_3AIF_6 or CaF_2` Method is known as Hall-Heroult PROCESS Cathode: `Al^(3+)('melt")+3e^(-)toA(l)` Anode: `C(s)+O^(2-)("melt")toCO(g) +2e^(-)` `C(s)+2O^(2-)("melt")toCO_2(g) +4e^(-)` (B)Electroytic reduction of molten anhydrous carnalite. `MgCl_2 hArr 2Na[Ag(CN)_2]+Na_2S` `{:("At cathode",Mg^(2+)+2e^(-)toMg(99% pure)),("At anode" , 2Cl^(-)toCl_2+2e^(-)):}` ( C)`Ag_2S+4NaCN hArr 2Na[Ag(CN)_2]+Na_2S` `Na_2S+2O_2 to Na_2SO_4` `2Na[Ag(CN)_2]+Zn to Na_2[Zn(CN)_4]+2Ag darr` (D)`2PbS+3O_2oversetDeltato2PbO +2SO_2` `2PbO+PbSto 3Pb+SO_2`

Discussion

966.	Which will not give acetamide on reaction with ammonia
Answer» ACETIC acid Acetyl chloride Acetic anhydride Methyl formate Answer :D

Discussion

967.	Which of the following is known as camphor substitute ?
Answer» `C_(2)Cl_(6)` `CHCl_(3)` `CF_(3).CHClBr` `CF_(2)Cl_(2)` SOLUTION :`C_(2)Cl_(6)` is known as artificial CAMPHOR.

Discussion

968.	Which is not an alcohol :
Answer» `CH_2=CHCH_2OH` `CH_2OHCH_2OH` `C_6H_5CH_2OH` `C_6H_5OH` ANSWER :D

Discussion

969.	Write the formulas of the following coordination compounds : (i) Tetraamminediaquacobalt (III) chloride (ii) Potassium tetracyanonickelete (II) (iii) Tris(ethane-1, 2-diamine) platinum (II) nitrate (iv) Amminebromidochloridonitrito-N-platinate (II) (v) Dichloridobis (ethane-1, 2-diamine) platinum (IV) nitrate (vi) Iron (III) hexacyanoferrate (II)
Answer» Solution :(i) `[Co(NH_(3))_(4)(H_(2)O)_(2)]Cl_(3)`(ii) `K_(2)[Ni(CN)_(4)]` (III) `[Cr(en)_(3)]Cl_(3)` (iv) `[Pt(NH_(3))BrCl(NO_(2))]^(-)` (v) `[PtCl_(2)(en)_(2)](NO_(3))_(2)`(vi) `Fe_(4)[FE(CN)_(6)]^(3)`

Discussion

970.	Which of the following reagents or process are suitable to distinguish MeOH and EtOH ?
Answer» NaCl anhydrous `ZnCl_(2)`+conc. HCL Victor Meyer's process Solution :EtOH gives+ve test with salicylic ACID and form WINTER oil FREEN.

Discussion

971.	Which ion has 5.93 BM magnetic moment?
Answer» `MN^(2+)` `Fe^(2+)` `Cr^(2+)` `V^(3+)` Solution :For `Mn^(2+)` will be `3D^(5)` `:. mu= sqrt(5(5+2)) = sqrt35= 5.92BM`

Discussion

972.	Transition metals are widely used as catalysts in industrial processes. Why do the transition elements exhibit greater similarity in properties compared to main group elements along the period as well as down the group?
Answer» Solution :In transition METALS, the last electron is added to INNER b-orbital. Since the outer electronic configuration remain the same for a series, they SHOW greater similarity in properties along a period. In a group, these ELEMENTS do not differ much in SIZE. So they show greater similarity in properties in a group.

Discussion

973.	Which type of particles satisfy primary valency?
Answer» SOLUTION :NEGATIVELY CHARGED PARTICLES.

Discussion

974.	Which of the following respond to chromyl chloride test
Answer» `SnCl_(2)` `NACL` `PbCl_(2)` `AGCL` Solution :Chronyl chloride TEST for only free chloride ions `(Cl^(-))`

Discussion

975.	The value of Henry's constantkmu is"__________."
Answer» greater for GASES with HIGHER solubility. greater for gases with lower solubility. constant for all gases. not related to the solubility of gases. Answer :B

Discussion

976.	Which reactants are involved in Mendius reaction?
Answer» RCN and `LiAIH_4` RCN and `H_2O //HCI` RCN and `Zn//NH_4Cl` RCN and `SnCI_4//HCI` ANSWER :1

Discussion

977.	Whichone is the natural polyamide polymer ?
Answer» CUPRAMMONIUM SILK Wool Perlon-L Jute Answer :B

Discussion

978.	The value ofLambda_(m)^(@)" for "NH_(4) Cl, NaOH and NaCl" are 129.8, 248.1 and 126.4 Ohm"^(-1)" cm"^(2)" mol"^(-1) respectively. Calculate Lambda_(m)^(@) for NH_(4)OH solution.
Answer» 215.5 251.5 244.7 351.5 Answer :B

Discussion

979.	Which of the following is correct regarding the reaction of fluorine with water ? 2F_(2)(g) + 2H_(2)O(l) to 4H^(+) (aq) + 4F^(-) (aq) + O_(2)(g)
Answer» Fluorine is oxidized to `F^(-)` WATER is oxidized to `O_(2)` Water is REDUCED to `H^(+)` Oxidation state of fluorine does not change Solution :In the given reaction `F_(2)` is an oxidising agent which oxides `H_(2)O` to `O_(2)`. Oxidation state of fluorine changes 0 to `-1`.

Discussion

980.	Which of the following detergent belong to ABS-group-
Answer» SODIUM Lauryl sulphate Sodium dodecyl benzene sulphonate Cetytrimethyl ammonium BROMIDE Pentaerythrityl stearate ANSWER :B

Discussion

981.	Which of the following imparts green colour to the glass
Answer» `Cu_(2)O` `CDS` `MnO_(2)` `Cr_(2)O_(3)` Answer :D

Discussion

982.	When calomel electrode acts as an anode then the reaction is
Answer» `2 HG + 2 Cl^(-) to Hg_(2) Cl_(2) + 2e^(-)` `Hg_(2) Cl_(2) to 2 Hg^(+) + Cl_(2) + 2e^(-)` `Hg_(2) Cl_(2) + 2e ^(-) to 2 Hg + Cl_(2)` `Hg_(2)Cl_(2) + 2e^(-) to 2 Hg + 2 Cl^(-)` Solution :The cell REACTIONS are at ANODE (oxidation) `2 Hg + 2 Cl^(-) to Hg_(2) Cl_(2) + 2 e^(-)`

Discussion

983.	Which is used as a drug to reduce fever?
Answer» Diethyl ETHER ACETONE Acetophenone PARACETAMOL SOLUTION :Paracetamol

Discussion

984.	Which one of the following is square planar in structure and has diamagnetic property ?
Answer» `[NI(H_2O)_6]^(2+)` `[Ni(CO)_4]` `[Ni(CN)_4]^(2-)` `[NiCl_4]^(2-)` Answer :D

Discussion

985.	What is a condensation polymer ? Give one example.
Answer» Solution :Condensation polymers are FORMED by repeated condensation reaction between two bifunctional or trifunctional monomer units usually with the elimination of small molecules like water, ALCOHOL, AMMONIA , carbon dioxide , hydrogen chloride , ETC. For example, nylon 6,6polyester , bakelite, etc.

Discussion

986.	What is photochemical smog? What are its consequences?
Answer» ANSWER :49 MG

Discussion

987.	Which metal is present in vitamin B_(12) ?
Answer» Iron Cobalt Manganese Copper Answer :A::B::C

Discussion

988.	What is the order of basic nature of hydrides of VA group elements?
Answer» `AsH_(3) GT SbH_(3) gt PH_(3) gt NH_(3)` `NH_(3) gt SbH_(3) gt PH_(3) gt AsH_(3)` `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` `PH_(3) gt NH_(3) gt SbH_(3) gt AsH_(3)` ANSWER :3

Discussion

989.	Which of the followingare sulpha drugs ?
Answer» Sulphapyridine PRONTOSIL Salvarsan Nardil Solution :Sulpha drugs kills bacteria and fungi by interfering with their metabolism. (a) Sulphapyridine is a sulphonamide antibacterial drug. It is no longer precribed for the treatmentof infections in humans. It isgood antibacterial drug., but its WATER solubility is very pH DEPENDENT. Thus, there is a risk of crystallisation within the baldder or urethra, which could lead to pain or blockage. (b) Prontosil is also called sulphamidochrysoidine. It is USED inthe treatment of general bacterial infection in humans. Salversan is arsenic BASED antibacterial drug. It is used inthe treatment of syphills. (d) Nardil is an antidepressant drug.

Discussion

990.	which of the following orbitals has three angular nodes?
Answer» 2s 4s 3d 6f Answer :D

Discussion

991.	Which of the following oil can be used for the preparation of soap by alkaline hydrolysis
Answer» PARAFFIN OIL COCONUT oil Kerosine oil Turpentine oil Answer :B

Discussion

992.	Which of the following compound is optically active
Answer» `C_(2)H_(5)-OH` `(CH_(3))_(2)CHCH_(3)-Cl` `CH_(3)-CHClC_(2)H_(5)` `C Cl_(2)F_(2)` Answer :C

Discussion

993.	When of the following can reduce Fehling's solution?
Answer» FORMIC acid Formaldehyde and acetaldehyde ACETIC acid acetaldehyde SOLUTION :Only acetic acid does not REDUCE FEHLING's solution.

Discussion

994.	When one mole of an alkene on ozonolysis produces 2 moles of propanone, the alkene is
Answer» 3-methyl-1-butene 2, 3-dimethyl-2-butene 2, 3-dimethyl-2-pentene 2, 3-dimethyl-2-pentene ANSWER :D

Discussion

995.	Which of the following would undergo aldol condensation?
Answer» `"CCL"_3CHO` `CH_3 - undersetoverset(\|)(CH_3)oversetunderset(\|)(CH_3)(C ) - CHO` `HCHO ` `CH_3CHO` SOLUTION :`CH_3CHO`

Discussion

996.	Which of the following units is useful in relating concentration of solution with its vapour pressure ?
Answer» Mole fraction Parts per million Mass percentage Molality SOLUTION :Explanation : It is mole fraction (x) which is useful in RELATING concentration of solution with its vapour presure. For EXAMPLE according to Rault.s law in a binary solution of two volatile liquids, `p_(1)=x_(1)p_(1)^(0)` where `p_(1)` is vapour pressure of component I, and `x_(1)` is its mole fraction in solution, `p_(1)^(0)` DENOTES the vapour pressure of pure solvent.

Discussion

997.	Which among the following is not an antibiotic
Answer» Ofloxacin Oxytocin Penicillin Tetracycline Solution :Oxytocin is a HORMONE, which is released from posterior pituitary gland. It controls the contraction of uterus after child BIRTH and releases MILK from themammary glands.

Discussion

998.	Which of following oxide is not acidic ?
Answer» <P>`N_(2)O_(3)` `P_(4)O_(10)` `N_(2)O_(5)` `Bi_(2)O_(5)` Answer :D

Discussion

999.	Write the structures of the isomers of alcohols with molecular formula C_(4)H_(10)O. Which of these will exhibit optical activity ?
Answer» Solution :`to` The structures of the ISOMERS of alcohols with molecular formula `C_(4)H_(10)O` are : (a) `underset("Butan-1-ol"(1^(@)))(CH_(3)CH_(2)CH_(2)CH_(2)OH)` (B) `underset("2-Methylpropan-1-ol" (1^(@)))( CH_(3)- underset(CH_(3))underset(\|)CH- CH_(2)OH)` (c) `underset("2-methylpropan-2-ol"(3^(@)))(CH_(3)- underset(OH)underset(\|)overset(CH_(3))overset(\|)C- CH_(3))` Butan-2-ol is optically active.

Discussion

1000.	Write name and structure of monomers of following polymer : Dacron
Answer» SOLUTION :ETHYLENE GLYCOL + Terephthalic ACID

Discussion

Explore topic-wise InterviewSolutions in .

Thiokol is used as

Which metal has a greater tendency to form metal oxide ?

The reagent (X) in the given reaction is phenol underset(273K)overset("''X''")(rarr) Parabromophenol

Three arrangements are shown for the complex [Co(e n) (NH_(3))_(2)Cl_(2)]^(+)pick up the correct statement:-

Which one of the following is / true :- (i) At critical temp the surface separating two phases disappears (ii) below critical temperature a gas is called vapour (iii) A gas can't be liquified below critical temp. (iv) Higher the critical temp. difficult to liquify a gas

The solubility of AgCl will be minimum in……….

The stability of coordination compounds is related to ______ , ______ and exotropy terms.

Which of the following dimensions of a unit cell represent a cubic unit

Which is not poisonous ?

Which one of the following platinum complexes is used in cancer chemotherapy?

Which of the following compounds has highest boiling point ?

Which statement is false.

What is HDPE? Give its preparation and use.

Which of the following rubber if not a polydiene

Which will not give acetamide on reaction with ammonia

Which of the following is known as camphor substitute ?

Which is not an alcohol :

Which of the following reagents or process are suitable to distinguish MeOH and EtOH ?

Which ion has 5.93 BM magnetic moment?

Transition metals are widely used as catalysts in industrial processes. Why do the transition elements exhibit greater similarity in properties compared to main group elements along the period as well as down the group?

Which type of particles satisfy primary valency?

Which of the following respond to chromyl chloride test

The value of Henry's constantkmu is"__________."

Which reactants are involved in Mendius reaction?

Whichone is the natural polyamide polymer ?

The value ofLambda_(m)^(@)" for "NH_(4) Cl, NaOH and NaCl" are 129.8, 248.1 and 126.4 Ohm"^(-1)" cm"^(2)" mol"^(-1) respectively. Calculate Lambda_(m)^(@) for NH_(4)OH solution.

Which of the following is correct regarding the reaction of fluorine with water ? 2F_(2)(g) + 2H_(2)O(l) to 4H^(+) (aq) + 4F^(-) (aq) + O_(2)(g)

Which of the following detergent belong to ABS-group-

Which of the following imparts green colour to the glass

When calomel electrode acts as an anode then the reaction is

Which is used as a drug to reduce fever?

Which one of the following is square planar in structure and has diamagnetic property ?

What is a condensation polymer ? Give one example.

What is photochemical smog? What are its consequences?

Which metal is present in vitamin B_(12) ?

What is the order of basic nature of hydrides of VA group elements?

Which of the followingare sulpha drugs ?

which of the following orbitals has three angular nodes?

Which of the following oil can be used for the preparation of soap by alkaline hydrolysis

Which of the following compound is optically active

When of the following can reduce Fehling's solution?

When one mole of an alkene on ozonolysis produces 2 moles of propanone, the alkene is

Which of the following would undergo aldol condensation?

Which of the following units is useful in relating concentration of solution with its vapour pressure ?

Which among the following is not an antibiotic

Which of following oxide is not acidic ?

Write the structures of the isomers of alcohols with molecular formula C_(4)H_(10)O. Which of these will exhibit optical activity ?

Write name and structure of monomers of following polymer : Dacron

The stability of coordination compounds is related to , and exotropy terms.