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17151.

Write structures of the compound whose IUPAC names are as follows : 2-Methylbutane-2-ol

Answer»

SOLUTION :`CH_3-UNDERSET(OH)underset(|)OVERSET(CH_3)overset(|)C-CH_2- CH_3`
Discussion
17152.

Which of the following will show a negative deviation from Raoult's law?

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Acetone-benzene
Acetone-ethanol
Benzene-methanol
Acetone-chloroform

Solution :HYDROGEN bonds are FORMED on mixing acetone and chloroform. The new interactions in the MIXTURE are stronger than in the pure components. `Delta V` and `DeltaH` are negative. The solution shows negative DEVIATION.
Discussion
17153.

Which of the following two compounds can be used as a surface agent and why ?

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SOLUTION :Compound (i) acts as a surface AGENT because its ONE end is hydrophobic while the other end is HYDROPHILIC in nature.
Discussion
17154.

Which of the following will give haloform reaction

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Acetophenone
Ethanol
Acetaldehyde
Pentan-3-one

Solution :`CH_(3)-overset(O)overset(||)(C)-` group should be present for haloform reaction, `CH_(3)-overset(O)overset(||)(C)-` group is present in Acetophenone `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(3)` and `CH_(3)-overset(O)overset(||)(C)-H` (Acetaldehyde).
`CH_(3)CH_(2)OH overset("Mild OXIDATION")rarrCH_(3)-overset(O)overset(||)(C)-H`, therefore it responds to haloform reaction.
(d) `CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(2)-CH_(3)` does not give haloform reaction because it does not have `CH_(3)-overset(O)overset(||)(C)-` group.
Discussion
17155.

The use of diamond as a gem depends on its:

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Hardness
High REFRACTIVE index
Purest FORM of carbon
Chemical inertness

Answer :B
Discussion
17156.

Which of the following pairs acts as bacteriostatic antibiotics? Ofloxacin, Penicillin OR Erythromycin, Chloramphenicol.

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Solution :ERYTHROMYCIN, chloramphenicol acts as BACTERIOSTATIC ANTIBIOTICS.
Discussion
17157.

Which of the following compounds might be useful to the chemist trying to increase the optical purity of the (d) sample ?

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SOLUTION :OPTICALLY active compounds are used for separtion or RESOLUTION of `dl//(+-)` mixture.
Discussion
17158.

Which ion has the lower magnetic moment

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`FE^(2+)`
`NI^(2+)`
`Co^(3+)`
`Cu^(2+)`

ANSWER :D
Discussion
17159.

Which exhibits highest molar conductivity:

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`[CO(NH_3)_6]CI_3`
`[Co(NH_3)_5CI]CI_2`
`[Co(NH_3)_4CI_2]CI`
`[Co(NH_3)_3CI_3]`

ANSWER :A
Discussion
17160.

Which is not an ore :

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Cinnabar
Malachite
Zinc blende
Wrought iron

Answer :D
Discussion
17161.

Which is not an ore ?

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BAUXITE
Malachite
Zinc blende
Pig iron

Answer :D
Discussion
17162.

The uncertainty in momentum of an electron is 1 xx 10^(-5) kg mis. The uncertainty in its position will be (h = 6.62 xx 10^(- 34) kg m^(2)/s)

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`5.27xx10^(-30)` m
`1.05xx10^(-26)` m
`1.05xx10^(-28)` m
`5.25xx10^(-28)` m

Solution :`DeltaxxxDeltap=h/(4PI)`
(Heisenberg.s UNCERTAINTY PRINCIPLE)
`rArrDeltax=(6.62xx10^(-34))/(4xx3.14xx10^(-5))=5.27xx10^(-30)m`
Discussion
17163.

What is the role of t-butyl peroxide in the polymerisation of ethene

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SOLUTION :Catalyst/initiator of FREE RADICAL
Discussion
17164.

Which of the following acids is a vitamin ?

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Aspartic ACID
Ascorbic acid
ADIPIC acid
Saccharic acid

SOLUTION :Ascorbic acid is VITAMIN C.
Discussion
17165.

Zinc salts used in deodorants act as

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antiperspirants and ASTRINGENTS
astringents as well as antiseptics
antibacterials as well as antiperspirants
antiperspirants and antiseptics

Solution :ZINC salts in DEODORANTS ACT as astringents and antiseptics.
Discussion
17166.

Write the formulaof different oxides of manganese. What is the oxidation state of manganese in each of them ? Arrange them in order of their decreasing acidic character.

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Solution :`underset("BASIC")overset(+2)(MnO)""ubrace(overset(+8//3)(Mn_(3))O_(4)""overset(+3)(Mn_(2))O_(3)""overset(+4)(Mn)O_(2))_(" AMPHOTERIC")""underset("ACIDIC")(overset(+7)(Mn_(2))O_(7))`
Discussion
17167.

Whichof the following co-ordination compounds would exhibit optical isomerism?

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Pentaamminenitrocobalt (III) iodide
Diamminedichloropaltinum (II)
TRIS-( ethylenediamine )cobalt (III) BROMIDE
Transdicyanobis(ethylenediamine ) CHROMIUM (III) chloride

Answer :C
Discussion
17168.

Which one of the following electrolyte is used in Down's process of extracting sodium metal?

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`NACL+KCl+KF`
NaCl
`NAOH+KCl+KF`
`NaCl+NaOH`

ANSWER :A
Discussion
17169.

Write the IUPAC name of the following coordination compound: [Ni(NH_3)_6]Cl_2

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SOLUTION :Hexa-ammine NICKEL (II) CHLORIDE
Discussion
17170.

Which reagent is used for detection of sugar in urine

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BAEYER's agent
Tollen's agent
Fehling's agent
Bendict's agent

Answer :C
Discussion
17171.

Thomas slag is prepared by reaction between…

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`MNO and SiO_2`
`Cao and SiO_2`
`CaO and P4O_10 `
`FEO and SiO_2`

Solution :`6CaO and P_4O_(10) to UNDERSET("Thomas SLAG")(2Ca_3(PO_4)_(2))`
Discussion
17172.

The structure of XeF_(4) is

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TETRAHEDRAL
SQUARE planar
Linear
Octahedral.

ANSWER :B
Discussion
17173.

underset(NH_(2))underset(|)(CH_(2)CH_(2)CH_(2)-overset(O)overset(||)(C )-OH overset(Delta)rarr A overset(LAH)rarr B

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ANSWER :(A) `(##RES_ORG_CHM_V02_XII_C04_E01_279_A01##)`
Discussion
17174.

What is the action of acetic anhydride on diethyle amine ?

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SOLUTION :Acetic anhydrideon reaction with diethyl amine FORMS N-acetyl diethyl amine.
`(C_(2)H_(5))_(2)NH+(CH_(3)CO)_(2)O underset(Delta)overset("pyridine")tounderset("N-acetyl DIETHYLAMINE")((C_(2)H_(5))_(2)N-overset(O)overset("||")C-CH_(3))+CH_(3)COOH`
Discussion
17175.

When an electric is passed through acidified water, 112 mL of hydrogen gas at NTP was collected at the cathode in 965 seconds. The current passed, in ampere, is

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0.5
0.1
`1.0`
`2.0`

ANSWER :C
Discussion
17176.

Which of the following all characteristics of thermosetting polymers?

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Heavily branched cross LINKED polymers
I inrar slightly branched long chain molecule
Become infusible on MOULDING so cannot be reused.
Soften on HEATING and harden on COOLING, can be reused.

Answer :A::C
Discussion
17177.

Which of the following carbohydrates are branched polymers of glucose ?

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Amylose
Amylopectin
CELLULOSE
Glycogen

Solution :Amylopectin and glycogen both have BRANCHED chain structures but differ only in the NUMBER of GLUCOSE units in the chain length.
Discussion
17178.

Weakest C-Cl bond is present in

Answer»




ANSWER :D
Discussion
17179.

What is the common name of the compound prop-2-enal ?

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SOLUTION :ACROLEIN
Discussion
17180.

Which of the following elements can form stable nitride ?

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Na
Mg
Cs
Ca

Solution :MAGNESIUM can FORM STABLE NITRIDE.
Discussion
17181.

What will happen to the boiling point of a solution if mass of the solute dissolved is doubled and that of the solvent taken is halved ?

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SOLUTION :`DeltaT_(b)= (K_(b)W_(B)xx10^(3))/(M_(B)xxW_(A))`
Now , if `W_(A)` is doubled and W A is HALVED, the value of `DeltaT_(b)`will becomes FOUR times the original value.
Discussion
17182.

What is the total number of carbon atoms in P_(1) " to" P_(7) products ?

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91
92
93
34

Solution :
Discussion
17183.

Which one is known as fusion mixture?

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`Na_2CO_3` + `NaHCO_3`
`Na_2CO_3` + `NAOH`
`Na_2CO_3` +`CaSO_4`
`Na_2CO_3`+ `K_2CO_3`

ANSWER :D
Discussion
17184.

When sugar is treated with conc. sulphuric acid, the sugar is charred. In this process, sugar is

Answer»

reduced
oxidised
sulphonated
dehydrated

Solution :`C_12H_22O_11 OVERSET(CONC. H_2SO_4) to 12C + 11H_2O`
DEHYDRATING PROP. Of Conc. `H_2SO_4`
Discussion
17185.

When rivers meet the ocean, they generally form delta, give resasons.

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Solution :The river water contains NEGATIVELY charged SAND and clay particles. The sea water contains +vely charged ions `(NA^+, Mg^+2, Ca^+2 etc.)`. As the river water meets the sea water, these ions DISCHARGE the sand or clay particles which are PRECIPITATED as delta (due to coagulation).
Discussion
17186.

Which of the following is the use of lichens in case of pollution

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HEY treat the POLLUTED water
They act as bioindicators of pollution
They promote pollution
Lichens are not RELATED with pollution

Answer :B
Discussion
17187.

When ethyl amine is treated with CH_(3)MgBr, the product is

Answer»

`CH_(3)CH_(3)` <BR>`CH_(4)`
`CH_(3)CH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)CH_(3)`

Solution :`CH_(3)CH_(2)NH_(2)+CH_(3)MGBR rarr CH_(4)+Mg(CH_(3)CH_(2)NH)Br`
Discussion
17188.

Whilch of the following statements are correct?

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The plot log k against 1/T is STRAIGHT line
The slope of the line in the plot of log k vs 1/T is equal to `-E_(a)//2.303R`
The slope of the linein the plot of log k vs 1/T is equal to `-E_(a)`
The slope of the line in the plot of log (a-x) vs TIME is a straight line with negative slope equal to `-k//2.303`

SOLUTION :a. `K=a.E^(-Ea//Rt),logK=logA-(Ea)/(2.303R)xx1/T,log(a-x)=loga-(Kxxt)/2.303`
Discussion
17189.

What will be the value of molality for an aqueous solution of 10 % w/w NaOH ?(Na = 23, O = 16, H = 1)

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`2.778`
5
10
`2.5`

SOLUTION :`m = ("MASS of solute"xx1000)/("atomic weight" XX "mass of SOLVENT")`
`= (10xx1000)/(40xx90)=2.778`
Discussion
17190.

Which amont the following statements are correct?

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AQUA dag and oil dag are made up of graphite
Graphite reacts with conc. `HNO_(3)` to form METALLIC acid `C_(6)(COOH)_(6)`
`C_(3)O_(2)` is also toxic like CO
Zircon, `ZrSiO_(4)` is a gemstone

Answer :A::B::D
Discussion
17191.

When the cell reaction attains a state of equilibrium, the EMF of the cell is

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zero
positive
negative
not definite.

SOLUTION :When a cell REACTION ATTAINS equilibrium EMF of the cell becomes zero.
Discussion
17192.

Two solutions of HCI, A and B, haveconcentrations of 0.5 N and 0.1 M respectively. The volume of solutions A and B required to make 2 litres of 0.2 N HCl are

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0.5 L of A + 1.5 L of B
1.5 L of A + 0.5 L of B
1.0 L of A + 1.0 L of B
0.75 L of A + 1.25 L of B

Solution :LET volume of solution A = xL
Volume of solution B = (2 - X)L
`M_1V_1 + M_2V_2 = M(V_1 + V_2)`( for HCl = 0.1 M = 0.1 N)
`0.5 xx x + 0.1 (2-x) = 0.2 (2)`
`0.5 x + 0.2 - 0.1x = 0.4`
`0.4 x = 0.2 `
` x = (0.2)/(0.4) = 0.5 L`
vol. of A = 0.5 L , vol.of B = 2.0 - 0.5
= 1.5L
Discussion
17193.

Which substance serves as a reducing agent in the following reactions, 14H^++Cr_2O_7^(2-) +3Ni rarr 2Cr^(3+) +7H_2O +3Ni^(2+)

Answer»

`H_2O`
NI
`H^+`
`Cr-2O_7^(2-)`

ANSWER :B
Discussion
17194.

What is produced when SO_2is dissolved in water?

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SOLUTION :`SO_2` REDUES `KMnO_4` to `MnSO_4`.
`2KMnO_4 + 2H_2 + 5SO_2 RARR K_2SO_4 + 2MnSO_4 + 2H_2SO_4`
Discussion
17195.

What is the volume of water needed to dissolve 1 g of BaSO_4 (K_sp=1.1xx10^(-10)) at 25^@C?

Answer»

820 litre
410 litre
205 litre
None of these

Answer :B
Discussion
17196.

This graph explains ……………… .

Answer»

Absorption
Physical ADSORPTION
CHEMICAL adsorption
Desorption

Solution :Chemical adsorption
Discussion
17197.

To the clear solution of compound (X) a solution of barium chloride (BaCl_2) is added to give a white precipitate which does not dissolve in dilute HCl. The compound (X) is:

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A nitrate
A bromide
A solphate
A carbonate

Answer :C
Discussion
17198.

When same quantity of current is passed through two different electrolytes connected in series, the amount of products liberated at the electrodes are in the ratio of their.

Answer»

At.no.
At.wt.
Sp.gravity
Eq.wt.

Answer :D
Discussion
17199.

{:(X_2+O_2hArr 2XO",",K_1=1.5xx10^(-4)),(2XO_2 hArr X_2 + 2O_2",",K_2=2xx10^(4)):} Which oxide is more stable : -

Answer»

XO
`XO_2`
both are EQUALLY STABLE
NONE of these

ANSWER :A
Discussion
17200.

The vapour pressures of pure liquids A and B are 450 mm and 700 mm of Hg, respectivelyat 350 K. Calculate the composition of liquid mixture if total vapour pressure is 600 mm of Hg. Also find the composition of the mixture in vapour phase.

Answer»

Solution : Let the mole fraction of A be `x_A`and that of B be `x_B` .
Let the vapour pressure of component `A = p_A^0`
Vapour pressure of component `B = p_B^0`
Total pressure` = P_("total")`
`P_("total") = x_Ap_A^0 + x_Bp_B^0 = (1-x_B)p_A^0 + x_B p_B^0`
`p_("total") = p_A^0 + (p_B^0 + p_A^0) x_B`
Substituting the values, we have
`600 = 450 + (700 - 450)x_B`
`250x_B = 150 " or " x_B = 0.6`
THUS, a mixture of A and B with B having mole fraction of 0.6 will have the total vapour pressure of 600 MM.
Composition of the mixture in vapour phase
Use the relation : `p = yp_("total")`, where y is the mole fraction in vapour phase
`p_A = 0.4 xx 450 = 180 mm`
`p_B = 0.6 xx 700 = 420 mm`
`y_A = (p_A)/(p_("total")) = 180/600 = 0.3`
`y_B = (p_B)/(p_("total")) = 420/600 = 0.7`
Discussion