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.

21301.

Which of the following statements/relationships is not correct ?

Answer»

In an exothermic reaction, enthalpy of products is LESS than that of reactants.
A reaction for which `Delta H^(THETA) lt 0 and Delta S^(theta) gt 0` is spontaneous at all temperatures.
`Delta H` is less than, `Delta E` for the reaction :
`C(s) + (1)/(2) O_(2)(G) rarr CO(g)`
`Delta_("vap")H = Delta_("SUB")H - Delta_("fus")H`

Answer :C
Discussion
21302.

Which one of the following molecule will have all equal X-F bonds length? (where X=Central atom)

Answer»

`SOCl_(2)F_(2)`
`SeF_(4)`
`PBr_(2)F_(3)`
`IF_(7)`

SOLUTION :` (##BLJ_VKJ_ORG_CHE_C03_E02_030_S01.png" width="80%">
Discussion
21303.

The unit of cell constant is "………….."

Answer»

SOLUTION :`CM^(-1)`
Discussion
21304.

Which one of the following correctly represents esterification reaction

Answer»




ANSWER :A
Discussion
21305.

Which reagent can convert accetic acid into ethanol?

Answer»

NA + ALCOHOL
`LiAlH_4 + ` ETHER
`H_2+Pt`
`Sn+HCl`

ANSWER :B
Discussion
21306.

When 5.35 gm Acl is dissolved in 250 ml of water the pH of solution is found to be 4.827. Find the ionic radius of A+ and Cl^(-). If "Acl" forms CsCl type crystal having 2.2 g//cm^(3). Given K_(b)(AOH) = 1.8 xx 10^(-5) r^(+)/r^(-) = 0.732 for this cell unit.

Answer»

SOLUTION :`"ACL"(s) to A^(+)(aq) + CL^(-)(aq)`
`A^(+)(aq) + H_(2)O at equilibrium `C(1-alpha)`
antilog `(-4.827) = sqrt((1 xx 10^(-4))/(1.8 xx 10^(-5)) xx (5.35 xx 1000)/(M xx 250))`
M= 53.5
For CsC l type structure.
`rho = (ZM)/(a^(3) xx 6.0923 xx 10^(23))/(2.2 xx 6.023 xx 10^(23))^(1//3) = 3.43 A`
`r_(A)^(+) + r_(cl)^(-) = sqrt(3)/2 xx a = 0.866 a = 0.866 xx 3.43 A = 2.97` A
`therefore R_(Å)/R_(Cl-) = 0.732`
On solving `r_(A) = 1.255` A
`r_(Cl-) = 1.715` Å
Discussion
21307.

What is obtained when glucose is heated with HI for a long time?

Answer»

SOLUTION :n-hexane
Discussion
21308.

What will be the normality of a solution containing 4.9 g H_(3) PO_(4) dissolved in 500 ml water ?

Answer»

`0.3`
`1.0`
`3.0`
`0.1`

Solution :`N=(w xx 1000)/(E xx "VOLUME in ML."),E = (98)/(3) = 32.6`
`N=(4.9xx1000)/(32.6xx500)=0.3 N`.
Discussion
21309.

Which of the following oxides of chromium is amphoteric in nature?

Answer»

CRO
`Cr_(2)O_(3)`
`CrO_(3)`
 `CrO_(5)`

ANSWER :B
Discussion
21310.

Which of the following compounds is sparingly soluble in ammonia

Answer»

AgI
AgBr
AgCl
`CuCl_(2)`

Solution :NO is the most thermally STABLE oxide of nitrogen
`2NO OVERSET(900^(@)C)to N_(2)+ O_(2)`
`2N_(2)O overset(500-900^(@)C)to 2N_(2)+O_(2)`
`N_(2)O_(3) overset("Room temperature")to NO +O_(2)`
`2N_(2)O_(5) overset(40^(@)C)to4NO_(2)+O_(2)`
Discussion
21311.

underset (Hr_(2))overset(Br_(2))to Xunderset(H_(3)PO_(2))overset(NaNO_(2)//Hcl(0-5^(@)C))to Y The end product Y is:

Answer»




ANSWER :C
Discussion
21312.

Which of the following is correct order of boiling point of alcohol ? (i) Propan 1 - ol (ii) Butan -1 - ol (iii) Butan-2-ol (iv) 2-Methyl propan-2-ol

Answer»

` (i) LT (III) lt (II) lt (IV)`
` (i) lt (ii) lt (iv) lt (iii)`
` (i) lt (iv) lt (iii) lt (ii)`
` (i) lt (ii) lt (iii) lt (iv)`

SOLUTION :` (i) lt (iv) lt (iii) lt (ii)`
Discussion
21313.

What is the wave length in nanometers of radiation that has energy content 1.0xx100^(3)kJmol^(-1)? In which region of the electromagnetic spectrum this radiation is found.

Answer»

SOLUTION :`1.2xx10^(2)` NM, UV REGION
Discussion
21314.

Which of the following statement is false ? Among three is isomeric xylenes

Answer»

o-oxylene is sulphonated most easily
p-xylene is sulphonated most easily
m-xylene is sulphonated most easily.
all the THREE XYLENES are sulphonated at same rate.

Answer :(A, B,D)
Discussion
21315.

Which one of the following shows non- stoichiometric defect ?

Answer»

`FeO`
`AgBr`
`ZNO`
Both a and C

Answer :A::B::C::D
Discussion
21316.

Choose correct match

Answer»

Berthelot SALT `= KClO_(3)`
Fermy's salt `= KHF_(2)`
Javelle WATER = AQUEOUS NaOCl
Goiter= DEFICIENCY of `I_(2)` in diet

Solution :CONCEPTUAL
Discussion
21317.

What is Tollen's reagent ?

Answer»

SOLUTION :AMMONIACAL solution of SILVER NITRATE
Discussion
21318.

Which has maximu number of atoms?

Answer»

24G C(12)
56g Fe(56)
27g Al(27)
108g Ag(108)

Answer :A
Discussion
21319.

What happens at infinite dilution in a given solution ?

Answer»

The degree of dissociation is unity for weak ELECTROLYTES
The electrolyte is 100% ionised
All inter IONIC ATTRACTIONS disappear
All the THREE
Discussion
21320.

Which of the following reactions is not correct ?

Answer»

`MnO_4^(-)+8H^(+)+5Fe^(2+)to5Fe^(3+)+MN^(2+)+4H_2O`
`2MnO_2+4KOH+O_2to4KMnO_4+2H_2O`
`2Na_2CrO_4+2H^(+)toNa_2Cr_2O_7+2Na^(+)+H_2O`
`K_2Cr_2O_7+7H_2SO_4+6KIto4K_2SO_4+Cr_2(SO_4)_3+3I_2+7H_2O`

SOLUTION :`2MnO_2+4KOH+O_2 to 2K_2MnO_4+2H_2O`
Discussion
21321.

The shrinking of a plant of animal cell due to outflow of water is called ……………….. .

Answer»

SOLUTION :PLASMOLYSIS or CRENATION
Discussion
21322.

When sulphur dioxide is passed in an acidified K_(2)Cr_(2)O_(7) solution , the oxidation state of sulphur is changed from

Answer»

`+4" to"+6`
`+6" to"+4`
`+4" to"+0`
`+4" to"+2`

Solution :`K_(2)Cr_(2)O_(7)` acts as a STRONG OXIDISING agent . Itoxidises other compounds and GETS itself reduced . In `SO_(2)`, S is in +4 state so it gets oxidised to +6 state which is maximum group oxidation state.
`(K_(2)Cr_(2)O_(7)+4H_(2)SO_(4)toK_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+7H_(2)O+3S[SO_(2)+[O]+H_(2)OtoH_(2)SO_(4)]xx3)/(K_(2)Cr_(2)+[O]+H_(2)SO_(4)+2SO_(2)toK_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+H_(2)O)`
Discussion
21323.

Which is coloured supecies ?

Answer»

`MnO_(4)^(-)`
`TeO_(4)^(-)`
`ReO_(4)^(-)`
All

Solution :`MnO_(4)^(-) RARR ` DUE to CHARGE transffer
Discussion
21324.

Write notes on liquation.

Answer»

Solution :Liquation:This method ,is employed to move the ipurities with HIGH melting from metals having relatively low melting points such as tin (Sb,mp=904K),lead (Pb,mp=600K),Mercury (Hg,mp=234 K), and bismuth (Bi,mp=545 K).In this process ,the crude metal is heated to form fusible liquid and allowed to flow on a sloping surface .The IMPURE metal is placed on sloping hearth of a reverberatory FURNACE and it is heated just above the melting point of the metal in the absence of air,the molten PURE flows down and the impurities are left behind.The molten metal is collected and solidified.
Discussion
21325.

Write the formulas for the following coordination compounds : Iron (III) hexacyanoferrate(II)

Answer»

Solution :`Fe_(4)[FE(CN)_(6)]_(3)`
Discussion
21326.

Which of the following compounds will absorb the maximum quantity of heat per mole when dissolved completely in the same amount of water ? The heats of solution of these compounds at 25^(@) Cin kJ/mole of each solute is given in brackets :-

Answer»

`HNO_(3)(DeltaH=-33)`
`KCL(DeltaH = +17.64)`
`NH_(4)NO_(3)(DeltaH=+25.5)`
`HCl(DeltaH= -74.1)`

ANSWER :C
Discussion
21327.

When 16.8g of white solid, X were heated, 4.4 g of acid gas A, that turned lime water milky was driven off together with 1.8 g of a gas B which condensed to a colourless liquid. The solid that remained, Y, dissolved in water to give an alkaline solution, which excess barium chloride solution gave a white precipitate Z. The precipitate effervesces with acid giving of carbon dioxide. Identify a, B and Y and write down the equation for the thermal decomposition of X.

Answer»
Discussion
21328.

What is effective atomic number (EAN) ? Calculate EAN of cobalt (Z=27) in [CO(NH_(3))_(6)]^(+3) and of zinc (z=30) in [Zn(NH_(3))_(4)]SO_(4).

Answer»

Solution :Effective Atomic Number (EAN) : EAN represents the total number of ELECTRONS surrounding the nucleus of a metal atom in a metal complex. It is composed of the metal atom's electrons and the bonding electron from the surrounding electron donating atom and molecules.
CAlculation of EAN :
`[Co(NH_(3))_(6)]^(+3)""Co^(3+)` electrons = 24
Each `NH_(3)` CONTRIBUTES 2 bonding electrons. THUS 6 `NH_(3)` contributes `6xx2=12` bonding electrons.
Thus, EAN of cobalt in `[CO(NH_(3))_(6)]^(3+)` is
24+12=36
`[Zn(NH_(3))_(4)]SO_(4)""Zn^(2+)` electrons = 28
Each `NH_(3)` contributes 2 bonding elctrons. Thus 4
`NH_(3)` contributes `4xx2=8` bonding elctrons.
Thus, EAN of Zn in `[Zn(NH_(3))_(4)]SO_(4)` is 28 + 8 = 36
Discussion
21329.

Which of the following salts is colourless?

Answer»

`CdCl_2`
`CuSO_(4) *5H_(2)O`
`MnSO_(4) * 7 H_(2)O`
`NiSO_(4) * 7 H_(2)O`

SOLUTION :`CdCl_2` has `Cd^(2+)` ION `(4d^(10))` which is colourless.
Discussion
21330.

Which of the following liquid pairs shows a positive deviation from Raoult's law?

Answer»

WATER- NITRIC acid
BENZENE-methanol
Water - HYDROCHLORIC acid
Acetone- chloroform

Solution :A mixture of benzene and methanol show positive deviation from Raoult's law
Discussion
21331.

Write the important applications and uses of electrolysis .

Answer»


ANSWER :
Discussion
21332.

Which one of the following is used as nail polish remover?

Answer»

`CH_3CHO`
`HCHO`
`CH_3COCH_3`
`C_6H_5COCH_3`

SOLUTION :`CH_3COCH_3`
Discussion
21333.

The spectrum of He is expected to be similar to that of

Answer»

H
Na
`He^(+)`
`Li^(+)`

SOLUTION :He has TWO electrons. `Li^(+)` also has two ELELCTRONS.
Discussion
21334.

What volume of a solution of HCl containing 73 g/litre would suffice for the exact neutralization of NaOH obtained by allowing 0.46 g of metallic sodium to react with water.

Answer»


Solution :`2SO_(2)+O_(2)rarrSO_(3)`.
`""O_(2)" REQUIRED "=(1)/(2)xx294=147cm^(3)`
`"AIR required "=(100)/(21)xx147=700cm^(3)`
Discussion
21335.

What is Tollens' reagent ?

Answer»

Solution :Tollen's REAGENT is an ammoniacal solution of silver NITRATE. It has composition, `[AG(NH_3)_2]^+`. It is mild oxidising agent.
Discussion
21336.

Whichof the followingis Nef-Carbonyl synthesis

Answer»

`H-CHO + CH_(3) - NO_(2) OVERSET(alc. KOH)to`
`R - COCl underset("quinoline")overset(Pd - BaSO_(4))to`
`R - overset(O)overset(||)(C) - OH overset(LiAIH_(4))to`

Answer :D
Discussion
21337.

Which of the following relationships are wrong?

Answer»

1atm=0.1bar
1litre=1 `DM^(3)`
1J=0.239cal
1eV=`9.11xx10^(-4)`J

Answer :A::D
Discussion
21338.

Which of the following polymers, need atleast one diene monomer for their preparation ?

Answer»

DACRON
Novolac
NEOPRENE
TEFLON

ANSWER :C
Discussion
21339.

Which of the following gases combines with haemoglobin to form a very stable compound and reduces the oxygen carrying capacity of blood?

Answer»

`CO_2`
CO
`SO_2`
`NO_2`

ANSWER :B
Discussion
21340.

Unit of surface tension is

Answer»

`NM^2`
`Nm^-2`
`Nm^-1`
`Nm`

ANSWER :D
Discussion
21341.

When acetylene is passed through dil.H_2SO_4 in presence of HgSO_4,the compound formed is

Answer»

`C_2H_5OH`
ACETIC ACID
ACETONE
Acetaldehyde

Answer :D
Discussion
21342.

Write the names of monomers of the following polymer :

Answer»

SOLUTION :(i) ETHYLENE GLYCOL (II) Terephthalic ACID.
Discussion
21343.

Which consists of particle of matter ?

Answer»

ALPHA rays
Beta rays
Cathode rays
All of the above

Answer :D
Discussion
21344.

Which is not easily soluble in water

Answer»

`H_(2)`
`O_(2)`
`SO_(2)`
`CO_(2)`

ANSWER :C
Discussion
21345.

Which of the following will have a mesoisomer also?

Answer»

2,3-Dichloropentane
2.3-Dichlorobutane
2-Chlorobutane
2-Hydroxypropanoic acid

Solution :The COMPOUND has two SIMILAR assymmetric C-atoms. It has plane of symmetry and exist in MESO FORM.
Discussion
21346.

Which one will liberate Br_2 from KBr.

Answer»

`Cl_2`
HI
`I_2`
`SO_2`

ANSWER :A
Discussion
21347.

What is the difference between homogenous and hetrogenous catalysis?

Answer»

SOLUTION :
Discussion
21348.

What will happen during the electrolysis of aqueous solution of CuSO_(4) by using platinum electrodes?

Answer»

COPER will DEPOSIT at cathode.
Copper will deposti at anode.
Oxygen will be RELEASED at anode.
Copper will DISSOLVE at anode.

Answer :A::C::D
Discussion
21349.

The relation triangleG=triangleH-TtriangleS was given by

Answer»

Boltzmann
Faraday
Gibbs-Helmholtz
Thomson

Answer :C
Discussion
21350.

Which condition is not satisfied by an ideal solution:

Answer»

`DeltaH` MIXING = 0
`DELTAV` mixing = 0
`DeltaS` mixing = 0
Obeyance of RAOULT's law

Answer :C
Discussion