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551.

The value of K_(p) for the reaction H_(2)(g) + I_(2)(g)hArr2HI(g) is 50. What is the value of K_(C).

Answer»

30
40
50
70

Answer :C
Discussion
552.

When Br_(2) is treated with aqueous solutions of NaF, NaCl, NaI separately

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`F_(2), Cl_(2) and I_(2)` are liberated <BR>Only `F_(2) and Cl_(2)` are liberated
only `I_(2)` is liberated
only `Cl_(2)` is liberated

Solution :`Br_(2)` being a STRONGER oxidising agent displaces a weaker oxidising agent `(I_(2))` from its SALT (NaI).
`2NaI + Br_(2) RARR 2 NaBr + I_(2)`
Discussion
553.

What is the concentration of fluoraceticacid (K_a of acid = 2.6xx10^(-3)) Which is required to get [H^+]=1.50xx10^(-3) M ?

Answer»

0.865 M
`2.37xx10^(-3)`M
`2.37xx10^(-4)`M
`2.37xx10^(-2)`M

Answer :B
Discussion
554.

Tungsten crystallizes in body centred cubic unit cell. If the edge of the unit cell is 316.5 pm, what is the radius of Tungsten atom ?

Answer»

SOLUTION :For BCC unit CELL
`r = (sqrt(3)a)/(4)`
`r = (sqrt(3) XX "316.5 pm")/(4)`
`r = (1.732 xx "316.5 pm")/(4)`
r = 137 pm
Discussion
555.

Which polymer is used as lubricant and insulator both ?

Answer»

PVC
POLYTHENE
POLY STYRENE
TEFLON

Solution :Teflon
Discussion
556.

The set with correct order of acidity is:

Answer»

`HCIO LT HCIO_(2) lt HClO_(3) lt HClO_(4)`
`HClO_(4) lt HClO_(3) lt HClO_(2) lt HCIO`
`HCIO lt HClO_(4) lt HClO_(2) lt HClO_(2)`
`HClO_(4) lt HClO_(2) lt HClO_(3) lt HCIO`

ANSWER :A
Discussion
557.

Which of the following pairs constitutes a buffer

Answer»

`NHO_(3)` and `NH_(4)NO_(3)`
HCL and KCl
`NHO_(2)` and `NaNO_(2)`
NaOH and NaCl

Answer :A
Discussion
558.

What happen when 4-nitrobenzene diazonium chloride reagent reacts with an ammonium salt in the presence of sodium hydroxide solution ?

Answer»


SOLUTION :A RED COLOURATION is OBTAINED.
Discussion
559.

Weight of copper (atomic mass 63.5) deposited when 2 Faradays of electricity is passed through

Answer»

63.5g
31.15g
127g.
2G.

ANSWER :A
Discussion
560.

What is the role of dilute NaCN in the extraction of gold?

Answer»

Solution :Gold ore on treatment with a solution of NaCN forms a complex from which the metal is obtained by REPLACEMENT
`4AU(s) +8CN^(-) (aq) +2H_(2)O (aq) +O_(2) (g) to 4[AU (CN)_(2)]^(-) (aq) +4OH^(-) (aq)`
`2[Au (CN)_(2)]^(-) (aq) +Zn (s) to [Zn(CN)_(4)]^(2-) (aq) +2Au (s)`.
Discussion
561.

What would be the product formed when 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether?

Answer»




SOLUTION :It is an example of intramolecular Wurtz reaction
`Br^(-)` is a BETTER leaving GROUP than CHLORIDE. In this reaction alkali metal (Na) is ELECTRON donor.
Discussion
562.

Benzene to m-bromophenol

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SOLUTION :
Discussion
563.

Which can be reduced to the metal by heating it in a stream of hydrogen

Answer»

COPPER (II) oxide
Magnesium oxide
Aluminium oxide
Calcium oxide

Answer :A
Discussion
564.

Whichof the following is pergnancy control drug

Answer»

Noverstrol
dimetane
seldane
neproxen

Answer :A
Discussion
565.

Why boron has non-metallic character?

Answer»

Solution :The ATOMIC RADIUS of boron is very SMALL and it has relativey high nuclear charge and these properties are RESPONSIBLE for its NON metallic character.
Discussion
566.

Write the IUPAC name of the following complex [Co(NH_(3))_(3)(sigma-C_(3)H_(5))(en)]SO_(4). (I) n^(1)-allyltriamineethylenediamine cobalt(III) sulphate. (II) n^(1)- allyltriammineethylenediamine cobalt(III) sulphate (III) Triamminecyclopropylethyleinediamine cobalt (III) sulphate. (IV) Triamminecyclopropylethylenediamine cobaltate (III) sulphate.

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II only
I and II only
II and III only
I, III and IV only

ANSWER :C
Discussion
567.

Which of the following dihalide of oxygen exist in nature?

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`O_(2)Cl_(2)`
`O_(2)Br_(2)`
`O_(2)F_(2)`
`O_(2)l_(2)`

ANSWER :C
Discussion
568.

Which is used in high temperature thermometry ?

Answer»

Na
Ti
Ga
Hg

Answer :C
Discussion
569.

What are hydrogen bonded molecular solids ? Give example.

Answer»

SOLUTION :(i) Molecular solids in which the constituents are held together by HYDROGEN bonds.
(ii) They are generally soft solids under room temperature. Examples., Solid ice, GLUCOSE, UREA.
Discussion
570.

Which type of shapes are uncommon in coordination compounds ?

Answer»

Octahedral
Tetrahedral
Triangular
Square planar

Answer :C
Discussion
571.

What happens when H_(3)PO_(3) is heated ?

Answer»

<P>

Solution :The OXIDATION state of P in `H_(3) PO_(3)` is +3. Since this value is intermediate between the highest (+5) and lowest (-3) oxidation STATES of P, therefore, when `H_(3)PO_(3)` is heated, it undergoes disproportionation to FORM `PH_(3) and H_(3)PO_(4)` with oxidation states of -3 and +5 respectively.
`UNDERSET("Orthophosphorous acid")(4H_(3)overset(+3)(PO_(3))) overset("Heat") rarr underset("Phosphine")overset(-3)(PH_(3))+underset("Orthophosphoric acid")overset(+5)(H_(3)PO_(4))`
Discussion
572.

Describe the double helical structure of DNA.

Answer»


ANSWER :VAN DER WAALS FORCES
Discussion
573.

What is product obtained when tertiary butyl alcohol is treated with 20% H_(3)PO)*4) at 358 K ?

Answer»

SOLUTION :ISOBUTYLENE
Discussion
574.

Which of the following compounds liberates dihydrogen gas at anode when it is electrolysed in molten state but the same gas is liberated at cathode if its aqueous solution is electrolysed ?

Answer»

NaCl
NAH
`PH_4I`
`CuSO_4`

ANSWER :B
Discussion
575.

Which is not used as pigment in paints ?

Answer»

LEAD dioxide
White lead
Lead CHROMATE
`Pb_3O_4`

ANSWER :A
Discussion
576.

Which of the following is true in respect of adsorption ?

Answer»

`DELTA G lt 0, DELTAS gt 0, DeltaH lt 0`
`DELTAG lt 0, DeltaS lt 0, DeltaH lt 0`
`DeltaG gt 0, DeltaS gt 0, DeltaH lt 0`
`DeltaG lt 0, DeltaS lt 0, DeltaH gt 0`

Answer :A
Discussion
577.

When vapours of acetic acid are passed over …..537^(@) K we get acetone:

Answer»

`Al_(2)O_(3)`
`CuO`
`MnO`
`CU`.

ANSWER :C
Discussion
578.

Which one has highest lattice energy?

Answer»

NaI
NaF
NaCl
NaBr

Answer :B
Discussion
579.

Which statement is not true about potas alum?

Answer»

Its empirical FORMULA is `Kal (SO_4)_2.12H_2O`
Its AQUEOUS solution is basic in nature
It is used in DYEING industry
On heating , it melts in its water of

ANSWER :B
Discussion
580.

What does the negative sign in the expression E_(Zn^(2+)//Zn)^(@)=-76 V mean?

Answer»

Solution :Negative sign for `E_(Zn^(2+)//Zn)^(@)` shows that zinc is more reactive than hydrogen. This MEANS that when zinc electrode is CONNECTED to SHE, Znw will be OXIDIZED to `Zn^(2+)` and `H^(+)` will be reduced to `H_(2)`.
Discussion
581.

Which of the following metals cannot be extracted by the smelting process ? Al, Zn,Fe, Pb

Answer»

Solution :Aluminiumcannotbeextractedbythesmeltingprocessbecauseoffollowingreasons :
(i) Alishighlyelectropositiveelementhavingverystrongaffinityforoxygen. Therefore , `Al_2O_3 `isverystablecompoundand hencecannotbereducedbycarbon.
(ii) `Al_2O_3 `whenheatedwithcarbonformsaluminumcarbide.
`""2 Al_2O- 3+9 C toAl _ 4 C_3 + 6CO`
Discussion
582.

Which one of the following complexes is not expected to exhibit isomerism ?

Answer»

`[Ni(NH_(3))_(4)(H_(2)O)_(2)]^(2+)`
`[Pt(NH_(3))_(2)Cl_(2)]`
`[Ni(NH_(3))_(2)Cl_(2)]`
`[Ni(EN)_(3)]^(2+)`

Solution :`[Ni(NH_(3))_(2)Cl_(2)]` does not exhibit isomerism because it is a tetrahedral complex.
Discussion
583.

Which of the following does not contain material particles:

Answer»

ALPHA rays
Beta rays
Gamma rays
Canal rays

ANSWER :C
Discussion
584.

Which reaction represents the oxidizing behaviour of H_2SO_4 ?

Answer»

`2PCl_5 + H_2SO_4 RARR 2POCl_3 + 2HCl + SO_2Cl_2`
`2NAOH + H_2SO_4 rarr Na_2SO_4 + 2H_2O`
`NaCl + H_2SO_4 rarr NaHSO_4 + HCL`
`2HI + H_2SO_4 rarr I_2 + SO_2 + 2H_2O`

ANSWER :D
Discussion
585.

Which of the following gives the product below on heating with anhydrous AlCl_(3)//CS_(2)

Answer»




ANSWER :B
Discussion
586.

Treatment of compound Ph-O-overset(O)overset(||)(C)-Ph With NaOH solution yields

Answer»

Phenol
Sodium phenoxide
Sodium benzoate
Benzophenone

Solution :.
Discussion
587.

The total No. of isomers possible for the complex [Co (e n)_(2)Cl_(2)] is :-

Answer»

2
3
4
5

Solution :`[CO(e N)_(2)Cl_(2)] -G.I. 2, O.I. 2, S.I. = 3`
Discussion
588.

Which of the following statement is incorrect for ligand - metal complex

Answer»

LARGER the donor atom of the ligand, the more STABLE is the metal - ligand bond
Highly charged ligand forms STRONG bond
Larger the permanent dipole MOMENT of ligand, the more stable is the bond
Greater the ionization potential of CENTRAL metal, the stronger is the bond

Answer :B
Discussion
589.

Whichone fo the followingstatementsrelatedto lanthanide seriesis incorrect .

Answer»

Potassiumdichromateare ispreparedfrom ACETIC ACID
Chromateion is oxoanionsof CHROMIUM
Dichromateion is oxoanionsof chromium
POTASSIUM dichromateis apowerfuloxidising agentin acidicmedium.

Answer :A
Discussion
590.

When rectified spirit and benzene are distilled together, the first fraction obtained is

Answer»

A ternary azeotrope
Absolute alcohol
A binary azeotrope
Denatured spirit

Solution :Azeotropic distillation METHOD -Rectified `UNDERSET(darr "Fractional distillation")("spirit")`+BENZENE + water
First FRACTION at 331.8 K is ternary azeotrope (`H_(2)O 7.4% ` + Benzene 74% + alcohol 32.2 %)
Second fraction 341.2 K is a binary azeotrope(Benzene 67.7% + Alcohol 32.2%)
Last fraction at 351 K is absolute alcohol
Discussion
591.

What does the negative sign in F_(Zn^(2+)//Zn)^(@) =-0.76 V mean?

Answer»

SOLUTION : It means that Zn is more reactive than HYDROGEN. When zinc electrode is connected to standard hydrogen electrode, zinc gets oxidised and `H^(+)`gets REDUCED.
Discussion
592.

Which one of the following sets of compoundscorrectly illustrate the law of reciprocal proportions ?

Answer»

<P>`P_2O_3,PH_3, H_2O`
`P_2O_5, PH_3 , H_2O`
`N_2O_5, NH_3 , H_2O`
`N_2O , NH_3 , H_2O`

Solution :
RATIO of number of HYDROGEN and oxygen combiningwith ONE P is3:15i.e., 2:1
It is AME as in water (2:1)
Discussion
593.

What happens when CH_(3)CH_(2)OH heated with red P and HI ?

Answer»

Solution :`C_(2)H_(5) OH + 2H OVERSET("Red.p")(to) C_(2) H_(6) + I_(2) + H_(2) O`
Discussion
594.

Which of the following is a state function as well as intensive property?

Answer»

HEAT capacity
Internal energy
Temperature
volume

Answer :C
Discussion
595.

Which of the following structures is the most preferred and hence of lowest energy for SO_3

Answer»




Solution :Formal charges HELP in the selection of the lowest ENERGY structure from a number of POSSIBLE LEWIS structure for a given species. Generally the lowest energy structure is the one with the smallest formal charges on the atoms.
Discussion
596.

Whenpropanaalos heatedwithAn-Hgand cnc.HCl, whichisformed?

Answer»

`C_(3)H_(4)`
`C_(3)H_(8)`
`C_(3)H_(7)Cl`
`C_(3)H_(7)Cl`

Answer :C
Discussion
597.

Which decolourises the colour of acidic KMnO_(4)

Answer»

`CH_(3)COOH`
`CH_(3)CH_(2)COOH`
`COOH.COOH`
`CH_(3)COOC_(2)H_(5)`

Solution :`{:(,COOH),(,"|"),(,COOH):}+KMnO_(4)+H_(2)SO_(4)to2CO_(2)+H_(2)O+K_(2)SO_(4)+MnSO_(4)`
Discussion
598.

Which among the given compounds will react most readily with aq. AgNO_3?

Answer»




ANSWER :D
Discussion
599.

Write the structures of the monomers used for getting the following polymers : (a) PVC (b) Teflon (c) PMMA

Answer»

SOLUTION :(a) `CH_(2) = CHCL` (b) `CF_(2) = CF_(2)` (C) `CH_(2) = OVERSET(COOCH_(3))overset(|)(C) - CH_(3)`
Discussion
600.

Which of the following cannot be prepared by direct halogenation of benzene in the presence of Lewis acid ?

Answer»




All of the above

Solution :The direct iodination of AROMATIC hydrocarbons is not a useful reaction SINCE the Hl produced during the reaction being a good reducing agent redduces the aryl iodide BACK to the aromatic hydrocarbon and iodine.
Discussion