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15151.

The velocity corresponding to a gas "X" (MW=100) corresponding to the maxima of the curve given below at a given temperature is 200 m/s.Then kinetic energy of 300 gram of has "X" will be

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9000 kJ
9 kJ
90 kJ
810 kJ

Solution :The velocity CORRESPONDING to the maxima is the most probable velocity which is given by the expression
`C_(np)=sqrt((2RT)/M)`
`RT=(C_(mp)^2M)/2=((200)^2xx100xx10^(-3))/2=40000xx50xx10^(-3) J mol^(-1) = 40xx50J mol^(-1)`
No of moles =`300/100=3`
`E=3/2nRT=3/2xx3xx40xx50=9xx10^(3) J =9 kJ`
Discussion
15152.

Which of the following would react with nitrobenzene to give azoxybenzene

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ACIDIC glucose SOLUTION
`Zn, NAOH`
`Zn//NaOH, CH_(3)OH`
`Na_(3)AsO_(3) + NaOH`

Solution :See reduction of nitrobenzene.
Discussion
15153.

Units of Lambda_(m)are is S m^(3) mol^(-1) , if k is expressed in Sm^(-)and the concentration in mol m^(-3).

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ANSWER :FALSE
Discussion
15154.

Which of the following process involves decrease in magnetic moment of underlined atom

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`Na_(2)[FE(CN)_(5)NO]+Na_(2)Srarr`
`FeSO_(4)("solid")+H_(2)Orarr`
`FeSO_(4)(AQ)+NOrarr`
`ZN(CN)_(2)+underset(("excess"))(KCN)RARR`

Solution :
Discussion
15155.

The strongest ortho-para and stongest meta-directing groups respectively are

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`-NO_2` and `-NH_2`
`-CONH_2` and `-NH_2`
`-NH_2` and `-CONH_2`
`-X` and `-CONH_2`
Discussion
15156.

Through a given partition 7.5 liters of carbon dioxide diffuse in certain time. Calculate the volume of oxygen that diffuse through the same partition under the same conditions. (Atomic weight of C = 12, O = 16)

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ANSWER :8.795 L
Discussion
15157.

Which one of the following is used to treat infections caused by gram negative bacteria?

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KANAMYCIN
gentamycin
neomycin
all the above

Solution : all the above
Discussion
15158.

When KMnO_(4) solution is added to oxalic acid solution, the decolourization is slow in the beginning but becomes instantaneous after some time because….

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`CO_(2)` is FORMED as the product
Reaction is EXOTHERMIC
`MnO_(4)^(-)` catalyses the reaction
`Mn^(2+)` acts as autocatalyst

Solution :`Mn^(2+)` formed during the reaction ACT as auto CATALYST
Discussion
15159.

when acetone is heated with hydroxylamine the compound formed is :

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Cyanohydrin
Oxime
Semicarbazone
Hydrazone

Answer :B
Discussion
15160.

Which of the following are used as free radical chain initiators?

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BENZOYL preoxide
`t`-Butyl peroxide
`CCl_(4)`
Benzoyl peroxide

Answer :A::B
Discussion
15161.

Which of the following can act as adsorbent?

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SILICA GEL
Ammonia
Colourants
Water

Solution :Silica gel
Discussion
15162.

What is soap ?

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SODIUM salt of fatty ACID
Potassium salt of fatty acid
(A) and (B) both
Sodium salt of carbonic acid 

SOLUTION :(A) and (B) both
Discussion
15163.

What happens when nitroethane reacts with NaOH?

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SOLUTION :
Discussion
15164.

What is the ratio of (a) gram atoms and (b) weights of the metals liberated during the electrolysis of fused sodium fluroide, magnesium fluoride and aluminium fluoride connected in a series?

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SOLUTION :`Na^(+) e^(-) rarr Na, Mg^(2+) +2e^(-) rarr Mg` and `Al^(3+)+3e^(-) rarr Al`
Ratio of gram ATOMS of metals liberated using one Faraday
`= 1/1:1/2:1/3=6:3:2`,
`w_(1) :w_(2):w_(3)=E_(1):E_(2):E_(3)`
Ratio of weights of metals liberated `=23:12:9`
Discussion
15165.

What is the type of graph that would result between log (V) and log ((1)/(T)) at constant pressure?

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Solution :As per CHARLE’s law `V = kT` or `logV = logT + logk` . This is a graph of a STRAIGHT line with `"SLOPE" = 1` and `"INTERCEPT" = logk` .
Discussion
15166.

Why is bithional added to soap ?

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SOLUTION :To IMPART ANTISEPTIC PROPERTIES.
Discussion
15167.

triangleS^@ will be highest for the reaction

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`CA(s)+1//2O_2(G)rarrCaO(S)`
`CaCO_3(S)rarrCaO(s)+CO_2(g)`
`C(s)+O_2(g)rarrCO_2(g)`
`N_2(g)+O_2(g)rarr2NO(g)`

ANSWER :B
Discussion
15168.

Why arepentahalides more covalent than trihalides?

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Solution :Since ELEMENTS in the `+5` oxidation state have less tendency to LOSE electrons than in the `+3` oxidation state, therefore elements in the `+5` oxidation state are more COVALENT than in the `+3` oxidation state. In other WORDS, pentahalides are more covalent than trihalides.
Discussion
15169.

Which one of the following is not a buffer solution

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`0.8 M H_(2)S + 0.8 M KHS`<BR>`2M C_(6)H_(5)NH_(2) + 2M C_(6)H_(5)OVERSET(+)(N)H_(3)Br`
`3M H_(2)CO_(3) + 3M KHCO_(3)`
`0.05 M KClO_(4) + 0.05 M HClO_(4)`

Answer :D
Discussion
15170.

Write equations showing the steps involved in the course of the following reactions.

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SOLUTION :
Discussion
15171.

Two noble gases are obtained by the decay of radium. What are they?

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SOLUTION :Radioactive disintegration of radium is through ALPHA decay. Radon is obtained. Alpha PARTICLE gains 2 ELECTRONS and GIVES helium.
Discussion
15172.

UV radiations bring about :

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SKIN cancer
mouth cancer
lung cancer
liver cancer

Answer :A
Discussion
15173.

Which of the compounds shown below will react with diethyl malonate in the presence of methoxide ion to give a compound, which on treatment with aqueous acid and gentle heating will decarboxylate to form butanoic acid?

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`CH_3CH_3Br`

`CH_3CH_2CH_2Br`

ANSWER :B
Discussion
15174.

Which of the following metals does not occur as oxide ?

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IRON
ALUMINIUM
SODIUM
Copper

Answer :C
Discussion
15175.

WhichmethodisusedforrefiningZr andTi ?Explainwithequation.

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SOLUTION :VANARKELMETHOD is USED forrefiningofZr and TI.
Discussion
15176.

Which of the followingcompounds would not be consideredaromaticin its behaviour ?

Answer»




ANSWER :B
Discussion
15177.

Write the average oxidation number of (a) N in NaN_(3), (b) Fe in FeS_(2) and (c) O in KO_(2).

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ANSWER :(a) -1/3, (B) -1, (C) -1/2
Discussion
15178.

Which state of matter has definite mass, volume and shape ?

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SOLUTION :SOLID STATE
Discussion
15179.

Which of the following should be done in order to prepare 0.40 M NaCI starting with 100 ml of 0.30 M NaCI (Mol. Mass of NaCI = 58.5)?

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Add 0.585 g NaCl
Add 20 ml water
Add 0.010ml NaCl
Evaporate 10ml water

Solution :100 ml. of `0.30 M =(100xx0.3)/(1000)=0.03` mole of NaCl
100 ml of `0.40 M =(100xx0.4)/(1000)=0.04` mole of NaCl
MOLES of NaCl to be ADDED = 0.04-0.03 =0.01 mole
= 0.585 GM
Discussion
15180.

underset(("Purple"))(A)rarrunderset(("Green"))(B)+underset(("Black"))(C)+underset(("Gas"))(D) Wrong statement is

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Black compound 'C' is `MnO_(2)`
D is `Cl_(2)`
The oxidation state of the d- BLOCK metal in A is `+7`
The oxidation state of the d- block metal in B is `+6`

Solution :B is `K_(2)MnO_(4)` oxidation of state of `Mn^(+6)`
Discussion
15181.

When SO_2 is passed in a solution of potassium iodate, the oxidation state of iodine changes from :

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` +5` to `-1`
`-5` to `0`
`- 7` to `-1`

ANSWER :A
Discussion
15182.

Which of the following is formed during the extraction of silver ?

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`Na_(2)[Ag(CN)_(2)]`
`NA[Ag(CN)_(2)]`
`Na_(4)[Ag(CN)_(2)]`
`Na_(3)[Ag(CN)_(4)]`

Answer :B
Discussion
15183.

White vitriol (hydrated zinc sulphate) is isomorphous with MgSO_(4).7H_(2)O white vitriol contains 22.95% zinc and 43.9% of water of crystallisation. Find the atomic mass of zinc.

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Solution :The formula of white vitriol should be `ZnSO_(4),7H_(2)O` as it is isomorphous to `MgSO_(4).7H_(2)O`, i.e. 7 water molecules are associated with one zinc atom, `7H_(2)O=7xx18=126`. MASS of Zn with which 126 parts of water by mass are associated `=(22.95)/(43.90)xx126=65.87`=ATOMIC mass of zinc.
Discussion
15184.

Which of the following is not sugar ?

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Sucrose
Starch
Fructose
Glucose

Answer :B::C
Discussion
15185.

Which of the following possesses physical state of solute and solvent are liquid and solid respectively ?

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Solution of sugar in water
Zinc amalgam
Solution of NAPHTHALENE in benzene
Brass

Solution :Theory BASED "INTRODUCTION and definition of solution."
Discussion
15186.

Which of the following compounds would not evolve CO_(2) when treated with NaHCO_(3) solution?

Answer»

SALICYLIC ACID
Phenol
Benzoic acid
4-Nitrobenzoic acid

Answer :B
Discussion
15187.

Which of the following is used as refrigerant

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LIQUID `NH_3`
`C_2H_5Cl`
`"CCL"_2F_2`
All

Answer :D
Discussion
15188.

Toluene , when treated with Br_2//Fe , gives p-bromotoluene as the major product because the CH_3 group

Answer»

is para-directing
is meta-directing
Activates the ring to HYPERCONJUGATION
Deactivates the ring

Solution :
`-CH_3` group is able to activate the BENZENE ring by hyperconjugation . So `-CH_3` group SHOW o/p-directing influence on benzene ring
Discussion
15189.

What is the action of hydrazine on formaldehyde ?

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SOLUTION :FORMALDEHYDE on reaction with HYDRAZINE forms formaldehyde hydrazone.
Discussion
15190.

Which of the following reactions(s) is/are sterospecific but non-steroselcetive?

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`SN^(2)`
`E1`
`E2`
`ElcB`

Solution :In `ElcB` the first step is STHE ABSTRACTION of `beta-H` atom to give carbanion is specfic. But they from a mixture of possible PAIRS of enatiomers fo or a mixture of possible diastermores.
Discussion
15191.

What is the sweetness value of aspartame in comparison to sucrose ?

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160
550
600
2000 

SOLUTION :160
Discussion
15192.

Write the chemical equation for preparing sodium soap from glyceryl oleate and glyceryl palmitate. Structures of these compounds are given below : (i)(C_15H_31COO)_3C_3H_5-Glyceryl palmitate , (ii)(C_17H_33 COO)_3C_3H_5 -Glyceryl oleate .

Answer»

SOLUTION :
Discussion
15193.

Write the structure of the molecule of a compound whose IUPAC name is 1-phenylpropan-2-ol.

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SOLUTION :
Discussion
15194.

Which of the following is the strongest nucleophile?

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`NAOH`
`NASH`

SOLUTION :NA
Discussion
15195.

Which of the following is lactic acid ?

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`H-UNDERSET(CH_(3)) underset(|)OVERSET (COOH) overset(|)C-OH`
`H-underset(CH_(3)) underset(|)overset (CH_(3)) overset(|)C-COOH`
`H-underset(CH_(3)) underset(|)overset (CHOOH) overset(|)C-COOH`
`H-underset(CH_(3)) underset(|)overset (H) overset(|)C-COOH`

Solution :While writing the Fischer projection formula on paper carbon atoms arranged in vertical LINE with most oxidised STATE carbon at top
Discussion
15196.

Which statement is correct

Answer»

GANGUES are carefully chosen to COMBINE with the slag PRESENT in the ORE to produce easily FUSIBLE flux to carry away the impurities
Slags are carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities
Gangues are carefully chosen to combine with the flux present in the ore to produce easily fusible slag to carry away the impurities
Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities

Answer :D
Discussion
15197.

Write the structure and give IUPAC name of the alkane which gives only Pentan-2-one on reductive ozonolysis,

Answer»


Solution :`underset("4,5-Dimethyloct-4-ene")(CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset(|)(C )=overset(CH_(3))overset(|)(C )-CH_(2)-CH_(2)-CH_(3))underset((ii) Zn_(1)H_(2)O)overset((i) O_(3))rarrunderset("pentan-2-one")(2CH_(5)-CH_(2)-CH_(2)-overset(O)overset(||)(C )-CH_(3))`
Discussion
15198.

What is the use of coulometer ?

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Solution :There were no constant CURRENT sources AVAILABLE during Faraday.s times. The GENERAL practice was to put a coulometer (a standard electrolytic cell) for DETERMINING the quantity of electricity passed from the amount of METAL (generally silver or copper) deposited or consumed. however, coulometers are now obsolete.
Discussion
15199.

Zerevitinov's determination of active hydrogen ina compound is based upon its reaction with

Answer»

`NA`
`CH_(3)Mg`
`ZN`
`Al`

Solution :Number of active hydrogen in a compound corresponds to the number of moles of `CH_(4)` evolved per mole of the compound.
`-NH_(2), -SH, -OH or -C=CH overset(CH_(3)MgI)(to)CLCH_(4)UARR(2CH_(4) "from "-NH_(2))`
Discussion
15200.

Which carbonyl compound does not undergo aldol condensation :

Answer»

HCHO
`CH_3CHO`
`CH_3CH_2CHO`
`CH_3COCH_3`

ANSWER :A
Discussion