Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

16401.

Which one of the following bas largest number of isomers ?

Answer»

`[IR(PR_(3))_(2)H(CO)]^(2+)`
`[Co(NH_(3))_(5)Cl]^(2+)`
`[Ru(NH_(3))_(4)Cl_(2)]^(+)`
`[Co(en)_(2)Cl_(2)]^(+)`

SOLUTION :Isomers
`underset("cis and trans")([Ru(NH_(3))_(4)Cl_(2)]^(+)),underset("NONE")([Co(NH_(3))_(5)Cl]^(2+))`, `underset("cis and trans")([Ir(PR_(3))_(2)H(CO)]^(2+)),underset("cis and trans and optical isomers")([Co(en)_(2)Cl_(2)]^(+))`.
Discussion
16402.

Which of the following statements about Fe[(H_(2)O)_(5)NO]^(2-) are correct ?

Answer»

O.S of FE is +1
C.N. of Fe is 6
change of NO is +1
O.S. of Fe is +2

Solution :NO is a UNIPOSITIVE LIGAND `(NO^(+))`
Discussion
16403.

Which gives of O_2 on moderate heating is?

Answer»

CuO
HGO
ZnO
`Al_(2)O_(3)`

SOLUTION :OXIDES of METALS having very high electrode character), give off oxygen on moderate heating.
`HgO overset(Delta)to Hg+O`
Discussion
16404.

What happens when propanaldehyde is reduced by H_2//Ni?

Answer»

SOLUTION :PROPANOL -1 or n-Propyl ALOCHOL is FORMED.
Discussion
16405.

Which of the following reactions will yield 2, 2-dibromopropane ?

Answer»

`CH_(3)CH = CHBR + HBr rarr` <BR>`CH -= CH + 2HBr rarr`
`CH_(3) - CH = CH_(2) + HBr rarr`
`CH_(3) - C -= CH + 2HBr rarr`

Solution :`CH_(3) - C -= CH overset(HBr)rarr CH_(3) - underset(Br) underset(|)(C) = CH_(2) overset(HBr)rarrunderset("2, 2-Dibromopropane")(CH_(3) - underset(Br)underset(|)overset(Br)overset(|)(C) - CH_(3))`
Discussion
16406.

Two organic compounds (A) and (B) with molecular formula, C_3H_6O , react with HCN in different manner to produce (C) and (D) respectively. One subsequent hydrolysis of (C) and (D)give optically active substances (E) and (F). Both (E) and (F) on decarboxylation give I - propanol . What are (A), (B) , (C) , (D) , (E) and (F) ?

Answer»

Solution :(A) is `CH_3CH_2CHO, ` (B) is `CH_2=CHCH_2OH,` (C) is `CH_3CH_2CH(OH)CN,`(D) is `CH_3CH(CN)CH_2OH,(E) ` is `CH_3CH_2Ch(OH)COOH` and is (F) is `CH_3(COOH) CH_2OH. ` (E) and (F) are optically active.
Discussion
16407.

Which of the following stsrement is corrent about steel (S) and tungsten carbide (WC)?

Answer»

S is a substitutionalsolid while WC is an INTERSTITIAL SOLID solition
S is an interstitial solid while WC is an substitutional solid solution
Both are interstitial solid SOLUTIONS
Both are substitutional solid solutions

Solution :It is a FACT.
Discussion
16408.

Which metal is ferromagnetic?

Answer»

Cr
Fe
Zn
Al

Answer :B
Discussion
16409.

Which nucleic acid is responsible for protein synthesis in all cells.

Answer»

SOLUTION :`MRNA , RRNA , rRNA`
Discussion
16410.

The relationship between DeltaG^(@) of a reaction and its equilibrium constant is

Answer»

`-DELTA G^(@)=(RT)/(lnK)`
`DELTAG^(@)=(RT)/(lnK)`
`(RTlnK)/(DeltaG^(@))=-1`
`DeltaG^(@)=RTlnK`

Answer :A::C::D
Discussion
16411.

Vitamin A is

Answer»

ascorbic acid
RETINOL
CALCIFEROL
THIAMINE

ANSWER :B
Discussion
16412.

Which of the following plant is used for the purification of water

Answer»

Biggiata
Chlorella
Spirogyra
EICHHORNIA

Solution :Eichhornia, Azolla, Lemna, Salvinia , etc. have potential of ENVIRONMENTAL clean up because they can tolerate, uptake and even accumulate heavy metals and other TOXICANTS in their cells.
Discussion
16413.

Which alcohol reacts with fatty acids to form fats?

Answer»

Ethanol
Glycerol
Methanol
Isopropanol

Answer :B
Discussion
16414.

Which one of the following is chiral?

Answer»

`CICH_(2)CH_(2)CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)underset(CL)underset(|)(CH)CH_(2)CH_(3)`
`CICH=CHCH_(2)CH_(2)CH_(3)`
`Hunderset(Cl)underset(|)(C)=C=CHCH_(2)CH_(3)`

Answer :D
Discussion
16415.

The volume percentage of N_(2) in air is 78. The Weight percentage of the same

Answer»

75
78
80
85

Answer :A
Discussion
16416.

What is coagulation ? Explain the various factors which influence coagulation.

Answer»

Solution :Coagulation. The presence of traces of electrolyte is responsible for the stability of colloidal solutions. On the other hand, if a large excess of an electrolyte is added to a colloidal solution, the charge on the dispersed particles is neutralised. Consequently, particles come close together and grow in size as well as weight. This results in a precipitate which settles down due to heavy mass. This phenomenon of precipitation of colloidal particles by the addition of electrolyte is known as coagulation or precipitation. For example, if alum is added to muddy water (which contains negatively charged DIRT particles), the positively charged aluminium ions `Al^(3+)`neutralise charge on the dirt particles which get precipitated and thus water BECOMES free of dirt.
Factors influencing coagulation
(i) Nature of electrolyte. A sol i.e. colloidal solution gets precipitated or coagulated by the addition of electrolyte to it. The coagulation is, in fact, caused by the charge on the ion. Thus greater the ionic charge, greater will be its coagulating power. According to Hardy Schulze Rule, greater the valency of the active ion, greater will be its coagulating power. Thus, to coagulate a negative `As_2S_3`sol the order of the coagulating power of the following cations is :
` Al^(3+) gt Mg^(2+) gt Na^(+)`
Similarly to effect the coagulation of a positively charged sol such as `Fe(OH)_3` , the coagulating power of the following anions are arranged as:
`PO_(4)^(3-) gt SO_(4)^(2-) gt Cl^-`
(ii) Nature of Colloid. Lyophilic COLLOIDS are more difficult to coagulate than lyophobic colloids. (iii) Rise in temperature. Increase in temperature helps in the precipitation, e.g., WHITE of an egg gets coagulated on heating.(iv) Centrifuging. Due to difference in the density of the dispersion medium and the dispersed PHASE, centrifuging causes coagulation
Discussion
16417.

The van der Waal's gas constant, a is given by

Answer»

`3 V_c`
`27b^2 P_c`
`27 RB T_c`
`3 Rb P_c`

ANSWER :B
Discussion
16418.

The yellow colour solution of Na_(2)CrO_(4) changes to orange red on passing CO_(2) gas due to the formation of :

Answer»

`CrO_(5)` and `H_(2)O`
`CrO_(3)`
`Na_(2)Cr_(2)O_(7)` is not an oxidizing agent
`Cr_(2)O_(30`

Solution :Solution.
Discussion
16419.

Two compounds have the empirical formula Cr(NH_(3))_(3)(NO_(2)_(3) In aqueous solution,one of these conducts electricity while the other does not. Deduce their probable structures

Answer»

Solution :The compound which CONDUCTS electricity means it GIVES ions in aq. solution. Keeping in view the six co-ordination number of chromium and assuming that the `H_(2)O` molecules enter into the co-ordination sphere, its possible structure can be one of the following:`[Cr(NH_(3))_(3)(NO_(2)2H_(2)O] NO_(2)`
(ii) `(Cr(NH_(3))_(3)NO_(2)(H_(2)O)_(2)](NO_(2))_(2)`
(iii) `[Cr(NH_(3))_(3)(H_(2)O)_(3)](NO_(2))_(3)`
The compound which does not conduct electricity means it does not give ions in solution. Hence, it is neutral or uncharged complex. Its structure may be written as `[Cr(NH_(3))_(3)(NO_(2))_(3)]`
Discussion
16420.

Which of the following change represents is desproportination reaction(s) ?

Answer»

`CI_2 +2OH^(-)rarrCIO^(-) +CI^(-) +H_2O`
`Cu_2O +2H^+ rarrCu +CU^(2+) +H_2O`
`2HCuCI_2overset(dilution with water)rarrCu+Cu^(2+)4Cl^(-)+2H^+`
All of the above

Answer :D
Discussion
16421.

Which one of the following coordination compounds is used to inhibit the growth oftumours?

Answer»

<P>Trans-platin
EDTA COMPLEX of CALCIUM
`[(Ph_(3)P)_(3)RbCl]`
Cis-platin

Answer :D
Discussion
16422.

What is the range of molecular mass of polymers ? - A- A - A-A - A - A -

Answer»

SOLUTION :Homoplymer .
Discussion
16423.

Which of the given below is best method of preparing alkyl chloride?

Answer»

`ROH +SOCl_(2)`
`ROH+PCl_(5)RARR`
`ROH +PCl_(3)rarr`
`ROH+HCl OVERSET("anhy. ZnCl"_(2))rarr`

Answer :A
Discussion
16424.

What pressure of H_(2) would be required to make emf of hydrogen electrode zero in pure water at 25^(@)C ?

Answer»

`10^(-7) atm`
`10^(-14) atm`
1 atm
0.5 atm

SOLUTION :(c ) It is the CORRECT ANSWER,
Discussion
16425.

Which of the following does not undergo Hell-Volhard-Zelinsky reaction ?

Answer»

HCOOH
`C CI_(3)COOH`
`C_(6)H_(5)COOH`
All of these

Answer :D
Discussion
16426.

Which compound in the following couples will react faster in S_(N)2displacement and why? (a) 1-Bromopentane or 2-bromopentane (b) 1-Bromo-2-methylbutane or 2-bromo-2-methylbutane.

Answer»

SOLUTION :(a) 1-Bromopentane or 2-bromopentane <BR> `CH_(3) - CH_(2) - CH_(2) - CH_(2) - CH_(2)Br "" CH_(3)CHBrCH_(2)CH_(2)CH_(3) `
1-bromopentane will REACT FASTER . 2-bromopentane FACES some steric hindrance.
(b) `underset("1-Bromo -2-methylbutane") (CH_(3) - CH_(2) - overset(CH_(3)) overset(|)CH - CH_(2) - Br)"" underset("2-Bromo -2-methylbutane ") (CH_(3) - CH_(2) - underset(Br) underset(|) overset(CH_(3)) overset(|) C - CH_(3)) `
1-bromo-2-methylbutane reacts faster in `S_(N)2` displacement. There will be steric hindrance in the second compound.
Discussion
16427.

Which of the following complex exists as dextro and laevo form ?

Answer»

`##GRB_ORG_CHM_V01_QB_C05_E01_430_001##`
`##GRB_ORG_CHM_V01_QB_C05_E01_430_O02##`
`[AgFClBrI]^(Ө)`
`##GRB_ORG_CHM_V01_QB_C05_E01_430_O03##`

SOLUTION :(B) LACKS P.O.S as WELL as C.O.S.
Discussion
16428.

The sketeton equation to represent the action of chlorine on a hot solution of sodium hydroxide is : NaOH+Cl_(2)rarr NaCl+NaClO_(3)+H_(2)O Balance this equation by the method of partial Equations.

Answer»

Solution :This reaction is supposed to take place in the following steps:
(i) Chlorine reacts with water to form hydrochloric acid and HYPOCHLOROUS acid as intermediate products.
`Cl_(2)+H_(2)Orarr HCl+HClO"…(1)"`
(ii) Sodium hydroxide neutralises the acids formed in STEP (i) to form the corresponding salts
`NaOH+HClrarr NaCl+H_(2)O"...(2)"`
`NaOH+HClOrarr NaClO+H_(2)O"...(3)"`
(iii) Sodium HYPOCHLORITE, NaClO, is unstable at higher temperature. It undergoes self oxidation REDUCTION to give a mixture of sodium chloride and sodium chlorate.
`3NaClOrarr 2NaCl+NaClO_(3)"...(4)"`
(iv) To cancel the intermediate products which do not OCCUR in the final equation, multiply the partial equations (1), (2) and (3) by 3 each and then add all the four equations. We get
`3Cl_(2)+6NaOHrarr 5NaCl+NaClO_(3)+3H_(2)O`
This represents the balanced chemical equation.
Discussion
16429.

What is the oxidation and reduction half cell in a Daniel cell?

Answer»

SOLUTION :Oxidation half CELL : A metallic ZINC strip that dips into an AQUEOUS solution of zinc sulphate taken in a beaker.
Reduction half cell : A copper strip that dips into an aqueous solution of copper sulphate taken in a beaker.
Discussion
16430.

Write the anodic reaction. A to B increases two times by increasing the concentration 'A' by four times. what is the order of a reaction.

Answer»

SOLUTION :`2H_2+(4OH^-)to4H_2O+4c^-`
Discussion
16431.

Write the oxidation state and coordination number of metal in the complex, [CrCl_(3)(PY)_(3)].

Answer»

SOLUTION :For COMPLEX, `[CrCl_(3)(PY)_(3)],`
OXIDATION STATE : `+3`
Coordination number : 6.
Discussion
16432.

Which reagent can covert CH-=CH to CIC-=CCI

Answer»

`Cl_(2)`
HCl
NAOCL
`Cl_(2)O_(7)`

SOLUTION :`{:("C H"),("|||"),("C H"):} overset(NaOCl)UNDERSET(0^(@)C)to {:("C - Cl"),("|||"),("C - Cl"):}`
Discussion
16433.

Weakest acid is

Answer»

HOI
HOCI
HOBr
All have same strength

Answer :A
Discussion
16434.

Which alcohol reacts with fatty acids to form fats

Answer»

Ethanol
Glycerols
Methanol
Isopropanol

Answer :B
Discussion
16435.

What is corrosion ? Discuss the methods for preventing corrosion .

Answer»


ANSWER :
Discussion
16436.

Which of the following reactions does not result in the formation of new C-C bond?

Answer»

Wurtz-Fittig reaction
Fittig reaction
Williamson synthesis
Wurtz reaction

Answer :C
Discussion
16437.

Which one of the following is used as conditioner in froth flotation process

Answer»

PINE oil
soduiumethyl XANTHATE
Sodiumcarbanate
OLIVE oil

Answer :C
Discussion
16438.

Wurtz reaction is used to prepare organic compounds :

Answer»

ALKANES
Alcohols
Haloalkanes
None

Answer :D
Discussion
16439.

which among the following is a Z alkene ?

Answer»




ANSWER :C
Discussion
16440.

The substances which effect the central nervous system and induce sleep are called :

Answer»

TRANQUILLIZERS
ANTIPYRETIC
Analgesic
None of these

Answer :A
Discussion
16441.

What transition in the hydrogen emission spectrum have the same wavelength as Balmer transition, n=4 to n=2 of He+ spectrum ?

Answer»

SOLUTION :N = 2 to n = 1
Discussion
16442.

Which of the following acid is involved in corrosion of iron ?

Answer»

CARBOLIC acid
Carboxylic acid
Carbonic acid
Nitric acid

Answer :C
Discussion
16443.

Which of the following does not express the reaction rate ? 2A+B to 3C+D

Answer»

`(d[D])/(DT)`
`-(d[A])/(2dt)`
`-(d[C])/(3dt)`
`-(d[B])/(dt)`

ANSWER :C
Discussion
16444.

What are atomic defects ? State its types.

Answer»

SOLUTION : If in a CRYSTAL structure a DEFECT raised as a result of irregularity in the ARRANGEMENT of atoms or IONS are called atomic defects.
Discussion
16445.

Which of the following is weak acid?

Answer»




ANSWER :A
Discussion
16446.

Why + 3 oxidation state is stable in heavier element of group 15?

Answer»

Solution : (1) All theelementsof group15show oxdiationstateof `+3`and `+5`
(2) Down the group, the stability of +5 oxidation state decreases while that of+3 state increases DUE to inert pair effect of `ns^(2)` electrons.
(3) Large amount of ENERGY is NEEDED to REMOVE all five electrons (`ns^(2), np^(3)`) from the valence shell, hence stable +5 oxidation state cannot be formed by heavier element like Bi of group 15 having large atomic size.
Discussion
16447.

Which of the following complexes is non-conducting electricity?

Answer»

`CoCl_(3).3NH_(3)`
`CoCl_(3).6NH_(3)`
`CoCl_(3).4NH_(3)`
`CoCl_(3).5NH_(3)`.

SOLUTION :The COMPLEX is `[CoCl_(3)(NH_(3))_(3)]` and is non-ionic.
Discussion
16448.

Which of the following compounds cannot be identified by carbylamine test?

Answer»

`CH_3CH_2NH_2`
`CHCl_3`
`C_6H_5NH_2`
`C_6H_5-NH-C_6H_5`

ANSWER :D
Discussion
16449.

Write the structure of the major organic product in each of the following reaction : CH_(3)CH_(2)CH_(2)Cl + NaI underset("heat ") overset("acetone") to

Answer»

Solution :Reactions GIVING the structure of MAIN organic PRODUCT, are as under :
`underset("1-Chloropropane") (CH_(3)CH_(2)CH_(2)Cl ) + NaI overset("acetone , heat ") to underset("1-Iodopropane") (CH_(3)CH_(2)CH_(2)I) + NaCl ` (Finkelstein reaction )
Discussion
16450.

Write short notes on the following : (a) Tyndall Effect

Answer»

Solution :(a) Tyndall Effect : SCATTERING of light by colloidal particles by which part of BEAM BECOMES CLEARLY visible . This effect is known as tyndall effect .
Discussion