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5801.

Which of the following are coordination isomers of [Co(NH_(3))_(6)][Cr(CN)_(6)] ?

Answer»

`[CR(NH_(3))_(6)][Co(CN)_(6)]`
`[Cr(NH_(3))_(4)(CN)_(2)][Co(CN)_(4)(NH_(3))_(2)]`
`[Cr(NH_(3))_(3)(CN)_(3)][Co(NH_(3))_(3)(CN)_(3)]`
none of these

Answer :A::B
Discussion
5802.

Which of the following show glucose has aldehyde group

Answer»

It gives Tollen's REAGENT test
It gives Fehling's solution test
It gives Schiff's reagent test
It gives reaction with `NaHSO_(3)` and `NH_(3)`

Solution :(a) and (b) are CORRECT because glucose gives silver mirror with tollen's reagent and `Cu_(2)O darr` (BRICK red ppt) with Fehling's solution.
(c) and (d) are not correct because glucose does not react with Schiff's reagent , `NaHSO_(3) ` and `NH_(3)`
Discussion
5803.

Value of V_(NaOH) is

Answer»

`291ml`
`145.5ml`
`75ML`
`582ml`

Solution :`M_(H_(2)SO_(4))=24.7/98xx(1000xx1.18)/100=2.97`
`N_(H_(2)SO_(4))=5.94`
Meq. of `H_(2)SO_(4)="meq."` of `NAOH+"meq. of" Al`
`5.94xx75=0.5xxV_(NaOH)+300`
`V_(NaOH)=291ml`
Discussion
5804.

Which of the following gives propyne on hydrolysis?

Answer»

`Al_4C_3`
`Mg_2C_3`
both are correct
none of these

ANSWER :B
Discussion
5805.

Which of the following is 3 - phenylprop 2- en- l - al ?

Answer»

`C_(6)H_(5) - CH = CH - CH_(2) - CHO`
`C_(6)H_(5) - CH = CH - CHO`
`C_(6)H_(5) - CH_(2) - CHO`
`C_(6)H_(5) - CH = CH - CH_(2) - CH_(2)- CHO`

ANSWER :B
Discussion
5806.

Which of the following is/are correct statement(s)

Answer»

`MoO_(3)` and `WO_(3)` are not stronger oxidising AGENTS where as `Cr_(2)O_(7)^(2-)` is strong oxidising agent is `Au gt Cu gt Ag`
The ionisation enthalpy order of `Cu,Ag` and `Au` is `Au gt Cu gt Ag`
The high melting points of transition METALS are attributed to the involvement of greater number of electrons from `(n-1)d` in addition to the ns electrons
Second and third row transition elements havegreater enthalpy of ATOMIZATION than the corresponding elements of first transition series.

Solution :N//A
Discussion
5807.

Which of the following gases can be collected by downwarddisplacement of water?

Answer»

`N_(2)`
`O_(2)`
`PH_(3)`
`SO_(2)`

Solution :EXCEPT `SO_(2)` other gases are COLLECTED over water. Because `SO_(2)` - soluble in `H_(2)O`.
Discussion
5808.

Which of the following be the correct product (P) of the reaction

Answer»




ANSWER :B
Discussion
5809.

Which of the following represents neo-pentyl alcohol

Answer»

`CH_(3)CH(CH_(3))CH_(2)CH_(2)OH`
`(CH_(3))_(3)C-CH_(2)OH`
`CH_(3)(CH_(2))_(3)OH`
`CH_(3)CH_(2)CH(OH)C_(2)H_(5)`

Solution :`H_(3)C-UNDERSET(CH_(3))underset(|)OVERSET(CH_(3))overset(|)C-CH_(2)-OH`
Discussion
5810.

Which of the following will not undergo Hell Volhard Zelinsky reaction

Answer»

`CH_3COOH`
`CH_3CH_2COOH`
2,2-dimethyl PROPANOIC acid
2-methyl propanoic acid

Answer :C
Discussion
5811.

What is isomerism ?

Answer»

Solution :When the same molecular FORMULA REPRESENTS two or more COMPOUNDS having different physical and chemical properties, then such compounds are called isomers and the PHENOMENON is. called isomerism.
Discussion
5812.

When K_(2)MnO_(4) is added in solution of NH_(4)Cl then

Answer»

Green COLOUR will APPEAR
YELLOW colour will appear
Pink colour will appear
Colour will appear

ANSWER :B
Discussion
5813.

What is the electronic cofiguration of charomium atom(z= 24) Give reason for your answer.

Answer»

SOLUTION :`[AR]^(18) 3d^5 4s^1`
Discussion
5814.

The value of Planck's constant is 6.63xx10^(-34) Js. The velocity of light is 3xx10^(8) m//sec. Which value is closest to the wavelength of a quantum of light with frequency of 8xx10^(15) sec^(-1)?

Answer»

`5XX10^(-18) m`
`4xx10^(-8) m`
`3xx10^(7) m`
`2xx10^(-25) m`

ANSWER :B
Discussion
5815.

The strongest hydrogen bond is in

Answer»

`H_2O`
`H_2S`
`NH_3`
HF

Answer :D
Discussion
5816.

Which of the following units represents the largest amount of energy

Answer»

ELECTRON volt
Erg
Joule
Calorie

Answer :D
Discussion
5817.

Which of the following perfome reaction with I_(2)//OH^(-) ?

Answer»

`CH_(3)COCH_(2)CH_(3)`
`CH_(3)CONH_(2)`
`C_(6)H_(5)COCH_(3)`
`CH_(3)CHO`

SOLUTION :`CH_(3)CO-R` group WITHOUT electron withdrawing group at `beta` POSITION of `-C=O` will give idoform TEST.
Discussion
5818.

The standard reduction potentials of the elemtnts A, B.Care +2.37V,-1.85V and 1.36V respectively. The order of the their reducing power is :

Answer»

`B GT C gt A`
`A gt B gt C`
`C gt B gt A`
`B gt A gt C`

ANSWER :A
Discussion
5819.

Which of the following is/are incorrect statement regarding glucose:

Answer»

Glucose gives `+ve` TOLLEN's test
glucose pentaacetate can react with hydroxylamine which indicate the PRESENCE of free `-CHO` group
Amylopectin is a BRANCHED CHAIN polymer of `alpha`-D-glucose units. Where branching occurs by `C_(1)-C_(6)` glycosidec linkage.
Glucose doesnot get oxidised by bromine water, because bromine water is a mild oxidizing agent.

Solution :(i). Glucose pentaacetate donot reat with hydroxylamine
(ii). Bromine water can oxidize glucose into gluconic acid.
Discussion
5820.

Which of the following electrolytic solutionls has the least specific conductance ?

Answer»

2N
0.002 n
0.02 N
0.2 N

Solution :Specific CONDUCTANCE of electr vares with the concentration of the electrolyte . Ingeneral specific conductance of an electrolyte increases with decreases in concentrationor increase in DILUTION . So , electrolytic solution OFCONCENTRATION 2N has LEAST specific conductance.
Discussion
5821.

To an evacuated vessel movable piston under external pressure of1 atm, 0.1 mol of He and 1.0 mol of an unknown compound ( vapour pressure 0.68 atm, at 0^(@)C) are introduced. Considering the ideal gas behaviour , the total volume( in litre) of the gases at 0^(@)C is close to

Answer»


SOLUTION :`P_(He)=1-0.68=0.32 ATM`
`V=?`
`n=0.1, V= (nRT)/(P) = (0.1 xx 0.0821 xx 273)/(0.32)= 7`
Discussion
5822.

Which represents kinetic equation for gases ?

Answer»

`PV = mnu^2`
`PV = 1/2mnu^2`
`PV = 1/3mnu^2`
NONE of these

Answer :C
Discussion
5823.

What is the basicity of hypophosphorus acid ?

Answer»


SOLUTION :`H_(3)PO_(2)` has only one replaceable H, i.e., OH GROUP and hence its basicity is 1.
Discussion
5824.

What are the advantages of food additives?

Answer»

Solution :(i) Uses of preservatives reduce the product spoilage and extend the shelf-life of food.
(ii) ADDITION of vitamins and minerals reduces the mall nutrient.
(iii) FLAVOURING agents ENHANCE the aroma of the food.
(iv) ANTIOXIDANTS prevent the formation of potentially toxic OXIDATION products of lipids and other food constituents.
Discussion
5825.

When an isotope undergoes K-capture, its mass number

Answer»

remains the same while the atomic number increases by ONE
remains the same while the atomic number increases by two
remains the same while the atomic number decreases by one
remains the same while the atomic number decreases by two.

Solution :In K-CAPTURE REACTION, one electron of K ORBIT is absorbed into nucleus.
`""_(42)^(90)Mo overset("K - capture")(rarr) ""_(41)^(90)Nb`
Thus in K-electron capture mass number remains the same while atomic number is decreased by one.
Discussion
5826.

Which group is displaced by a halogen group:

Answer»

HYDROXYL (OH) group
Aldehyde (-CHO) group
Nitro (-NO_2) group
Keto (C=0) group

Answer :A
Discussion
5827.

What is protein part of enzyme called ?

Answer»

BIO ENZYME
CO FACTOR
Apoenzyme
Apoenzyme

Answer :C
Discussion
5828.

Which of the following salt will have same value of Van't Hoff's factor [i] as that of K_(4)[Fe(CN)_(6)]

Answer»

`Al_(2)(SO_(4))_(3)`
NaCl
`AL(NO_(3))_(3)`
`Na_(2)SO_(4)`

Answer :A
Discussion
5829.

Write two necessary conditions of Cannizzaro.s reaction.

Answer»

SOLUTION :(i) Aldehydes should not have alpha hydrogen atom.
(II) Concentrated alkali LIKE NAOH should be used.
Discussion
5830.

The specieswhich do not support octet rule are (a) H_2O(b) Cl_2O (c) NO(d) SF_5The correct answer is

Answer»

(a), (B) & (C)
(c) & (d)
(b), (c) &(d)
(b), (d) &(a)

ANSWER :B
Discussion
5831.

Which of the following is responsible for the rancidification of fats?

Answer»

HYDROGENATION
ESTERIFICATION and HYDROLYSIS
OXIDATION and hydrolysis
Dehydration

Answer :C
Discussion
5832.

Write the structures of products of the following reactions : (i) (ii) (C_(6)H_(5)CH_(2))_(2)Cd+2CH_(3)COCl rarr (iii) H_(3)C-C-=C-H overset(Hg^(2+), H_(2)SO_(4))rarr

Answer»

SOLUTION :
Discussion
5833.

Which of the following aqueous solutions remain alkaline after electrolysis ?

Answer»

`CH_(3)COONa`
`KNO_(3)`
`NaCl`
`LiF`

Solution :`a.` Reduction potential of `H_(2)OGT` Reduction potential of `Na^(o+)`.
HENCE,
Cathode `:2H_(2)O+2e^(-) rarr 2 overset(c-)(O)H+H_(2)`
`(`Solution is basic `)`
Anode `:CH_(3)COO^(c-) overset(Kolbe's el ectrolysis)rarrC_(2)H_(6)(`ETHANE`)+2CO_(2)`
`b. K^(o+)` does not undergo reductin but reduction of `H_(2)O` occurs to GIVE `overset(c-)(O)H` ion and `H_(2)(g)`.
Similarly, `NO^(c-)._(g)`.ion does not undergo oxidation but oxidation of `H_(2)O` occurs to give `H^(o+)` ions and `O_(2)(g)`.
`H^(o+)` and `overset(c-)(O)H` ions get neutralized and `pH=7(` neutral solution `).`
`c. Na^(o+)` ions do not undergo reduction but reduction of `H_(2)O` occurs to give `overset(c-)(O)H` ions and `H_(2)(g)` . `(` Hence, solution is basic`).`
`Cl^(c-)` undergoes oxidation to give `Cl_(2)(g)`.
`d.` Same explanation as in `(b)`.
Discussion
5834.

Which one of the following pairs of solution can we expect to be isotonic at thw same temperature?

Answer»

0.1 M UREA and 0.1 M NaCl
0.1 M urea and 0.2 M `MgCl_(2)`
0.1 M NaCl and 0.1 M `Na_(2)So_(4)`
0.1 M `Ca(NO_(3))_(2)` and 0.1 M `Na_(2)SO_(4)`

Answer :D
Discussion
5835.

Which of the following path ways produces 2-hexanone (i) 1-hexyne is treated with H_(2)SO_(4), HgSO_(4) and water (ii) 3-methyl-2-heptene is treated with O_(3) followed by hydrolysis (iii) n-butyl magnesium bromide reacts with acetaldehyde followed by hydrolysis and then chromic acid oxidation (iv) hydroboration-oxidation of 1-hexyne.

Answer»

`i`, ii and iii
`i` and ii only
`i` ii and iv only
`i` and ii only

Solution :`CH_(3)CHO` is most reactive DUE to least BIN drance and highest electrophilicity of the carndeonyl CARBON.
Discussion
5836.

Which pair of the ions has the same shape?

Answer»

`CO_(3)^(2-)` and `NO_(3)^(-)`
`CO_(3)^(2-)` and `SO_(3)^(2-)`
`NO_(3)^(-)` and `ClO_(3)^(-)`
`CO_(3)^(2-)` and `ClO_(3)^(-)`

Solution :`.^(-)O-OVERSET(O)overset(||)C-O^(-),.^(-)O-overset(O)overset(||)underset(+)N-O^(-)`
Discussion
5837.

Which of the following does not give iodoform test

Answer»

`CH_(3)CH_(2)OH`
`CH_(3)OH`
`CH_(3)CHO`
`PhCOCH_(3)`

SOLUTION :`CH_(3)OH` does not have `alpha`-HYDROGEN.
Discussion
5838.

Which statement is false for ozone ?

Answer»

It is OBTAINED by silent electric DISCHARGE on oxygen
It is an ENDOTHERMIC compound
It can be obtained by the action of ultraviloet rays of oxygen
It cannot be regarded as an allotrope of oxygen

Answer :D
Discussion
5839.

Which of the following reagents will not be useful in separating a mixture of Zn^(2+) and Cu^(2+)

Answer»

`H_(2)S`
`H_(2)S` in an ALKALINE medium
NaOH solution
all of the above

Solution :ZNS, CUS both precipitated
Discussion
5840.

The value of K_cfor 2HF(g) = H_2(g) + F_2(g)is 1.0 xx 10^(-3)at a particular temperature.At a certain time, the concentrations of HF, H_2and F_2were found to be 0.5, 1xx10^(- 3) and 4 xx 10^(-3) mole/litre respectively. Is the reaction at equilibrium? If not, what would be the direction to attain equilibrium?

Answer»

SOLUTION :No, TOWARDS RIGHT
Discussion
5841.

What do we call the drugs that bind to the receptor sites and inhibit natural function ?

Answer»

SOLUTION :ANTAGONISTS
Discussion
5842.

Which of the following is a camphor substitute:

Answer»

`CHCl_3`
`CF_2Cl_2`
`CF_3CHClBr`
`C_2Cl_6`

ANSWER :D
Discussion
5843.

Which of the following order of boiling point is correct?

Answer»

`H_(3)PO_(4) GT H_(2)SO_(4)`
`H_(2)O gt H_(2)O_(2)`
`H_(2)O gt SIC`
`NH_(3) gt HF`

Solution :`{:(M " to "K), (L " to "K)} to ` Isochoric
Discussion
5844.

Which one of the following has highest enthalpy of hydration?

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

ANSWER :A
Discussion
5845.

Which one of the following is the structure of B_(2)0_(3) ?

Answer»

Tetra hedral
Octahedral
TRIGONAL planar
CUBIC

ANSWER :C
Discussion
5846.

Which of the following is an alkaloid

Answer»

Nicotine
Piperine
Coniine
All of these

Solution :All these are ALKALOIDS.
Discussion
5847.

Which is the correct thermal stability order for H_2E (E = O, S, Se, Te, and Po) ?

Answer»

`H_(2)Se LT H_(2)Te lt H_(2)Po lt H_(2)O lt H_(2)S`
`H_(2)S lt H_(2)O lt H_(2)Se lt H_(2)Te lt H_(2)Po`
`H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te lt H_(2)Po`
`H_(2)Po lt H_(2)Te lt H_(2)Se lt H_(2)S lt H_(2)O`

Solution :The REDUCING property the central ATOM INCREASES down the group due to decrease in bond dissociation enthalpy of E - H bond.
Discussion
5848.

When acetaldehyde is heated with Tollen's reagent, following is obtained

Answer»

METHYL alcohol
Silver acetate
Silver MIRROR
Formaldehyde

Solution :`CH_(3)CHO +2underset("Tollen's REAGENT")([Ag(NH_(3))_(2)]OH)rarr CH_(3)COONH_(4)+underset("Silver mirror")(2Ag+3NH_(3)+H_(2)O)`
Discussion
5849.

Write the names of monomers used for getting following polymers : (i) Bakelite, (ii) Neoprene.

Answer»

SOLUTION :(i) PHENOL and FORMALDEHYDE.
(II) 2-Chloro-1, 3-butadiene (or CHLOROPRENE).
Discussion
5850.

Why borontrifluoride is act as lewis acid? Explain the react between BF_(3) and ammonia?

Answer»

SOLUTION :`BF_(3)` is an electron deficient compound and accepts electron pairs to form COORDINATE covalent BONDS. THEREFORE, borontrifluoride is act as lewis acid.
When `BF_(3)` reacts with ammonia to form complex.
`BF_(3)+NH_(3)to underset(("Complex"))(F_(3)larr)NH_(3)`
Discussion