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23201.

Which of the following compounds will not give positive chromyl chloride test ?

Answer»

`CuCl_(2)`
`HgCl_(2)`
`ZnCl_(2)`
`C_(6)H_(5)overset(+)(N) H_(3)Cl^(-)`

SOLUTION :`HgCl_(2)` being covalent does not give CHROMYL chloride test.
Discussion
23202.

Whichofthefollowingreactions isanexampleof autoreduction ?

Answer»

`FE _ 3 O_ 4+4 COto3 Fe+4CO _ 2`
` Cu_2O+ C to2Cu+ CO`
` Cu^( 2 +)(aq) +Fe (s) to Cu (s) +Fe ^(2 +) (aq) `
`Cu _ 2 O+(1)/(2) Cu_ 2S to3 Cu+(1)/(2)SO_ 2`

ANSWER :D
Discussion
23203.

What are polar molecular solids ? Give example.

Answer»

Solution :(i) The constituents are MOLECULES FORMED by polar covalent bonds.
(i) They are held TOGETHER by relatively strong dipole-dipole INTERACTIONS.
(iii) They have higher melting points than the non-polar molecular solids. Eg., Solid `CO_(2)," Solid "NH_(3)`,
Discussion
23204.

Whatisslag ? Giveone example.

Answer»

SOLUTION :A slag isan easilyfusiblematerialwhich isformedwhenganguestillpresentintheroastedorthecalcinedorecombineswiththeflux. Forexample, in THEMETALLURGYOF iron, CaO(FLUX )obtainedbydecompositionof` CaCO _3 `, combineswithsilicagangueto formeasilyfusiblecalciumsilicate( `CaSiO _3 ` ) slag.
` CaCO _ 3toCaO+CO_2, CaO+SiO_2to CaSiO _3 (slag ) `
Discussion
23205.

What is the oxidation state and hybridisation of boron in compound formed when BCl_(3) undergoes reaction with the water?

Answer»

`3, sp^(2)d`
`3, sp^(3)`
`4, sp^(3)`
`3, sp^(2)d`

SOLUTION :`BCl_(3)` FORMS `[B(OH)_(4)]^(-)` in which B is `sp^(3)` hybridised and have +3 oxidation STATE.
Discussion
23206.

When ethyl alcohol is dissolved in water, it is accompanied with :

Answer»

ABSORPTION of HEAT and CONTRACTION in volume
Evolution of heat and contraction in volume
Absorption of heat and INCREASE in volume
Evolution of heat and increase in volume

Answer :C
Discussion
23207.

Which statement is incorrect ?

Answer»

Silver glance mainly contains silver sulphide
Gold is FOUND in native state
Zinc BLENDE mainly contains zinc chloride
Copper pyrites ALSO contain `Fe_2S_3`

Answer :C
Discussion
23208.

Which of the following is the correct orderof decarboxylation of following carboxylic acids using soda lime?

Answer»




ANSWER :B
Discussion
23209.

The solubility product of As_(2)O_(3) is 10.8 xx 10^(-9). It is 50% dissociated in saturated solution. The solubility of salt is

Answer»

`10^(-2)`
`2 XX 10^(-2)`
`5 xx 10^(-3)`
`5.4 xx 10^(-9)`

Solution :`As_(2)O_(3) hArr 2As^(3+) + 3O^(2-)`
`K_(sp) = (2S)^(2) (3s)^(3)`
`10.8 xx 10^(-9) = 108 S^(5)`
`S = 10^(-2)`
If dissociation is 50% then solubility is `2 xx 10^(-2)` mol/L.
Discussion
23210.

The reagent used to distinguish between starch and sugar solution is:

Answer»

AMMONIACAL SILVER nitrate
Fehling's solution
Benedict's solution
Iodine solution

Answer :A
Discussion
23211.

To make nitrogen dioxide free from oxygen it is passed through U-tube:

Answer»

CONTAINING `FeSO_4`solution
Containing `NAOH` solution
Kept in FREEZING mixture
Kept in boiling water

Answer :C
Discussion
23212.

Which one of the following molecular species has the highest bond order ?

Answer»

`O_(2)`
`O_(2)^(-)`
`O_(2)^(+)`
`O_(2)^(2-)`

ANSWER :C
Discussion
23213.

The solubility of metal sulphides in saturated solution of H_2S {H_2S= 0.1 M} can be represented by MS + 2H^+Leftrightarrow M^(2+) +H_(2) S,K_(eq)=([M^(2+)][H_(2)S])/([H^(+]^2) The value of K_(eq) is given for few metal suphide. If conc. of each metal ion in solution is 0.01 M, which metal sulphides are selectively ppt at total [H^+]= 1M in saturated H2S solution. Metal sulphides Mns ZnS Cos Pbs K_(eq)=([M^(2+)][H_(2)S])/([H^(+]^2)

Answer»

MNS, ZNS, COS
PBS, ZnS, Cos
PbS, ZnS
PbS

Answer :D
Discussion
23214.

The solubility of AgCN increases by the addition of KCN because of:

Answer»

COMPLEX formation
Redox formation
Salt formation
None

Answer :A
Discussion
23215.

The reddish brown gas formed when nitric oxide is oxidised by air is :

Answer»

`N_(2)O_(5)`
`N_(2)O_(4)`
`NO_(2)`
`N_(2)O_(3)`.

Answer :C
Discussion
23216.

Which of the following increases with dilution ?

Answer»

Conductance
Specific conductance
Cell constant
None of these.

Answer :A
Discussion
23217.

Which alcohol is used as skin cleanser for injection?

Answer»

METHANOL
ETHANOL
1-propanol
2-propanol

SOLUTION :2-propanol
Discussion
23218.

triangleG^@ and triangleH^(@) for a reaction at 300K are -66.9 kJ/mole and 41.8 kJ/mole respectively. triangleG^(@) for the same reaction at 330K is

Answer»

`-25.1kJ`
`+25.1kJ`
`118.7kJ`
`-69.4kJ`

ANSWER :D
Discussion
23219.

The volume of O_(2) at STP liberated by 5 amperes flowing for 193 sec through acidulated water will be

Answer»

`56CM^(3)`
`112CM^(3)`
`224cm^(3)`
`448CM^(3)`

ANSWER :A
Discussion
23220.

What type of defect can arise when a solid is heated ? Which physical property is affected by it and in what way ?

Answer»

SOLUTION :On heating, some ATOMS or ions leave the lattice positions because of increased kinetic ENERGY. Thus, some VACANCIES are created at some lattice sites. This RESULTS in decrease of density.
Discussion
23221.

Which metal Aprons are worn by radiographer to protect him from radiation

Answer»

MERCURY coated apron
LEAD apron
Copper apron
Aluminimised apron

Solution :Lead ABSORB the harmful RADIATIONS
Discussion
23222.

Which of the following does not give only glucose on hydrolysis?

Answer»

Sucrose
Raffinose
Maltose
Galactose

Answer :A::B::C
Discussion
23223.

What is the molality of ethyl alocohol (mol. Wt. = 46) in aqueous solution which freezes at -10^@C: (K_f for water = 1.86 K molality^-1)

Answer»

3.54
4.567
5.376
6.315

Answer :C
Discussion
23224.

What happens when phosphine is absorbed in mercuric chloride solution ?

Answer»

SOLUTION :MERCURIC PHOSPHIDE is FORMEDBY the reaction between phosphine and mercuric SALT.
`2PH_(3)+3HgCl_(2) to Hg_(3)+6HCl`
Discussion
23225.

Which of the following carbonyl compound can give Cannizzaro reaction?

Answer»

`C Cl_(3)CHO`
`(CH_(3))_(3)C CHO`
`CH_(3)CH_(2)CHO`
Both (1) & (2)

ANSWER :B
Discussion
23226.

Which oxofluoride of xenon is octahedral?

Answer»

Solution :`XeO_(2)F_(4)` is octahedral.
Discussion
23227.

Which forms new compound in air

Answer»

`H_(2)O` in AIR
`O_(2)` in air
`N_(2)` in air
phosphorus in air

ANSWER :B
Discussion
23228.

Which of the following under go nucleophilic substitution faster than that of chlorobenzene

Answer»




Solution : DUE to presence of ELECTRON withdrawing GROUPS on BENZENE ring
Discussion
23229.

Which of the following is corroded faster ? Iron pole in sea water or iron pole on the beach.

Answer»


ANSWER :
Discussion
23230.

When NaOH solution is gradually added to the solution of a weak acid (HA), the pH of the solution is found to be 5.0 at the addition of 10.0 mL of NaOH and 6.0 at the further addition of 10.0 mL of same NaOH.(Total volume of NaOH=20 mL) calculate pK_a for HA[log 2 =0.3] [Fill your answer in the form of multiple of 10^(-1) for example if your answer is 2.1 then fill 21 as your answer ]

Answer»


Solution :LET initial conc. Of HA & NaOH be `C_1 & C_2`mol/L and initial volume of HA=`V_1mL`
`therefore 5.0=pK_a+"LOG"(10C_2)/((C_1V_1-10C_2))`...(1)
`6.0=pK_a+"log"(20C_2)/((C_1V_1-20C_2))`...(2)from these we get
`C_1V_1=22.5 C_2`
`:.5.0=pK_a+"log"(10C_2)/(22.5C_2-10C_2)=pK_a+log(0.8)`
`:. pK_a=5.1`
Discussion
23231.

What is corrosion? Mention a general method to prevent it.

Answer»

Solution : A metal is oxidized by LOSS of ELECTRONS and formation of oxides. PREVENTION
(i) Painting(ii) Cathodic protection.
Discussion
23232.

Which of the following expression is true regarding gas laws? (w=weight, M=molecular mass)

Answer»

`T_1/T_2 = (M_1 w_2)/(M_2 w_1)`
`T_1/T_2 = (M_2 w_1)/(M_1 w_2)`
`T_1/T_2 =(M_1 w_1)/(M_2w_2)`
`T_2/T_1 = (M_1 w_1)/(M_2 w_2)`

ANSWER :A
Discussion
23233.

Whatis difference between essentail and non essential alpha - amino acids.

Answer»

Solution :The amino acids WHICHCAN besynthosised by humanbody are callednon - ESSENTIAL amino acidwhilethose whichour bodyfails to FORMS are CALLED essential amino ACID.
Discussion
23234.

When sucrose is heated to 483 K temperature, it loses water and forms a brown amorphous substance called ……………….

Answer»

ASPARTAME
CARAMEL
ALITAME
SUCROLOSE

SOLUTION :Caramel
Discussion
23235.

What volumes of 2 M and 6 M solutions of HCl have to be mixed to prepare 500 mL of a 3 M solutions? Disgard the change in the volume in mixing .

Answer»

SOLUTION :375 ML ,125 mL
Discussion
23236.

The standard emf of a galvanic cell can be calculated from :

Answer»

The SIZE of the solution
The PH of the solution
The amount of metal in the anode
The `E^@` values of the two half cells

ANSWER :D
Discussion
23237.

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

Answer»

are above the INVERSION temperature
exert no ATTRACTIVE forces on each other
do work equal to the loss in kinetic energy
collide WITHOUT loss of energy

Answer :B
Discussion
23238.

Which of the following statement is not correct ? (P) [Ni(H_(2)O)_(6)]^(2+) and [Ni(NH_(3))_(6)]^(2+) have same value of CFSE (Q) [Ni(H_(2)O)_(6)]^(2+) and[Ni(NH_(3))_(6)]^(2+) have same value of magnetic moment

Answer»

<P>Only P
Only Q
Both P and Q
None of these

Answer :A
Discussion
23239.

What is the electrochemical equivalent ( in g "coulomb"^(-1)) of silver ? (Ag = 108, F= faraday)

Answer»

108 F
108/ F
F/108
1 / 108F

Answer :B
Discussion
23240.

The red colouring matter of blood which transports oxygen contains an element in a system of rings. The element is :

Answer»

Iron
Magnesium
Cobalt
Calcium

Answer :A
Discussion
23241.

The temperature coefficient of a reaction is

Answer»

Specific reaction rate at `25^(@)C`
Rate of the reaction at `100^(@)C`
Ratio of the rate constants at TEMPERATURE `35^(@)C` and `25^(@)C`
Ratio of the rate constants at two temperature DIFFERING by `1^(@)C `

Solution :Temperature COEFFICIENT `(K_(35^(@)C))/(K_(25^(@)C)) = (K_(308K))/(K_(298K)) = 2` and 3 for most reactions .
Discussion
23242.

The total no. of diprotic acids among the following is H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3), H_(2)S_(2)O_(7), H_(3)BO_(3), H_(3)PO_(2), H_(2)CrO_(4), H_(2)SO_(3), H_(2)CO_(3)

Answer»


Solution :`H_(2)SO_(4), H_(3)PO_(3), H_(2)S_(2)O_(7), H_(2)SO_(3), H_(2)CrO_(4), H_(2)CO_(3)`
Discussion
23243.

Which contains both covalent and ionic bonds ?

Answer»

`C Cl_4`
KCN
`CaCl_2 `
`H_2O`

ANSWER :B
Discussion
23244.

What happens when edialysis is prolonged ?

Answer»

Solution :On prolonged dialysis, even the very small amount (TRACE amount) of the electrolyte which stabilizes the SOL is compoletely removed. HENCE the sol becomes unstabkle and its coagulation takes place.
Discussion
23245.

Which is most acidic?

Answer»

`C Cl_(3)COOH`
`CHCl_(2)COOH`
`CH_(2)ClCOOH`
`CH_(3)COOH`

ANSWER :A
Discussion
23246.

Which of the following statements is not correct.Some antisecptics can be added to soaps,Dilute solutions of some disinfectants can be used as antiseptic,Disinfectants are antimicrobial drugs,Antiseptic medicines can be ingested.

Answer»

Some antisecptics can be added to soaps
Dilute SOLUTIONS of some disinfectants can be USED as antiseptic
Disinfectants are antimicrobial drugs
Antiseptic MEDICINES can be ingested.

Answer :D
Discussion
23247.

Which obeys mono molecular layer formation during adsorption ?

Answer»

LANGMUIR adsorption
Chemical Adsorption
Chemisorption
All

Answer :D
Discussion
23248.

When ethyl alcohol reacts with thionyl chloride in presence of pyridine , it produces :

Answer»

`CH_3CH_2Cl+HCl`
`CH_3CH_2Cl+Cl_2+SO_2`
`C_2H_5Cl+HCl+SO-2`
`CH_3CH_2Cl+H_2O+SO_2`

ANSWER :C
Discussion
23249.

Which amine in each of the following pairs is a stronger base? Give reasons. CH_3 CH_2 CH_2 NH_2 or CH_3 NH CH_2 CH_3

Answer»

SOLUTION :`CH_3 NHCH_2 CH_3`
Discussion
23250.

The total energy of the electron in the hydrogen atom in the ground sate is -13.6 eV. The KE of this electron is

Answer»

6.8 E V
0
`-13.6 EV`
13.6 e V

Answer :D
Discussion