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12951.

The values of Ksp of CaCO_(3) and CaC_(2)O_(4) are 4.7 xx 10^(-9) and 1.3 xx 10^(-9) respectively at 25^(@)C. If the mixture of these two is washed with water, what is the concentration of Ca^(2+) ions in water

Answer»

`5.831 xx 10^(-5)M`
`6.856 xx 10^(-5)M`
`3.606 xx 10^(-5) M`
`7.746 xx 10^(-5) M`

Solution :`CaCO_(3) RARR underset(X)(Ca^(2+)) + underset(x)(CO_(3))^(2-)`
`CaC_(2)O_(4) rarr underset(y)(Ca^(2+)) + underset(y)(C_(2)O_(4))^(2-)`
Now, `[Ca^(2+)] = x + y`
and `x(x+y) = 4.7 xx 10^(-9)`
`y(x+y) = 1.3 xx 10^(-9)`
On solving we GET
`[Ca^(2+)] = 7.746 xx 10^(-5)M`.
Discussion
12952.

Which compound is most reactive towards nucleophilic addition ?

Answer»

`CH_(3)CHO`
`PhCOCH_(3)`
`PhDPh`
`CH_(3)COCH_(3)`

SOLUTION :
Discussion
12953.

Which of the following compounds will give curdy precipate with AgNO_(3) solution?

Answer»




SOLUTION :a It is ARYL halide, stablised by resonance.
B. Vinyl chloride is also stablised by resonance.

C. Vinyl system as in (b).
d.
Discussion
12954.

The rms velocity of an ideal gas at 27^@C is 0.3ms^(-1) . Its rms velocity at 927^@ C (in ms^(-1)) is :

Answer»

3
2.4
0.9
0.6

Answer :D
Discussion
12955.

A reaction varies independentto the concentration of reactant, then the order of reaction is:

Answer»

Zero
1
2
3

Answer :C
Discussion
12956.

Which hydride is an ionic hydride?

Answer»

`H_(2)S`
`TiH_(4)`
`NH_(3)`
`NaH`

SOLUTION :All METAL HYDRIDES are ionic in nature.
Discussion
12957.

What are the species X and Y in the followingX+H_(2)OtoH_(2)Cr_(2)O_(7)overset(OH^(-))toY

Answer»

`CrO_(4)^(-2),Cr_(2)O_(7)^(-2)`
`CrO_(3),Cr_(2)O_(3)`
`H_(2)CrO_(4),H_(2)Cr_(2)O_(7)`
`CrO_(3),CrO_(4)^(-2)`

ANSWER :D
Discussion
12958.

Which of the following is a weakest acid in its aqueous solution ?

Answer»

`H_(2)Te `
`H_(2)SE `
`H_(2)S`
`H_(2)PO`

ANSWER :C
Discussion
12959.

Which of the following pairs show coordination isomerism ?

Answer»

`[Co(NH_(3))_(6)][Cr(CN)_(6)]and[Cr(NH_(3))_(6)][Co(CN)_(6)]`
`[Co(NH_(3))_(3)(H_(2)O)_(2)Cl]Brand[Co(NH_(3))_(3)(H_(2)O)Cl.Br]Br.H_(2)O`
`[PT(NH_(3))_(4)Cl_(2)]Br_(2)and[Pt(NH_(3))_(4)Br_(2)]Cl_(2)`
`[Co(NH_(3))_(6)][Cr(C_(2)O_(4))_(3)]and[Cr(NH_(3))_(6)][Co(C_(2)O_(4))_(3)]`

Solution :Compounds in (b) are hydrate isomers and those in (c) are ionization isomers.
Discussion
12960.

When benzoic acid dissolve in benzene, the observed molecular mass is

Answer»

244
61
366
122

Solution :Benzoic ACID in BENZENE UNDERGOES association through INTERMOLECULAR hydrogen BONDING.
Discussion
12961.

When AgNO_3 solution is added in excess to 1M solution of CoC1_3 cx NH_3 one mole of AgCl is formed ? What is the value if 'X'?

Answer»

1
2
3
4

Answer :D
Discussion
12962.

Which of the following pairs of molecules have the almost identical bond dissociation energy?

Answer»

`F_(2) and H_(2)`
`N_(2) and CO`
`F_(2) and I_(2)`
`HF and O_(2)`

Answer :C
Discussion
12963.

Which statement is /are correct?

Answer»

All bronstad bases are also Lewis bases
All bronstad ACIDS are not Lewis ACID
All CATIONS are acids and all anions are base
All of the above

Answer :D
Discussion
12964.

What happens when ethyl iodide is heated with sodium in dry ethereal solution ? Give equation.

Answer»

SOLUTION :BUTANE isform
Discussion
12965.

The Vander Waal's equation explains the behavior of -

Answer»

IDEAL gases
Real gases
Vapours
Non-real gases

Answer :B
Discussion
12966.

Which is strongest oxidising agent

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
I

Solution :OXIDISING power `=F_(2) GT Cl_(2) gt Br_(2) gt I_(2)`
Above the ORDER is Ilustrated by their reaction condition with `H_(2)O and H_(2)`
Discussion
12967.

Which of the following statement is incorrect regarding the metallurgy of aluminium by electrolystic method ?

Answer»

Electrolyte is `Al_(2)O_(3)` dissolved in `Na_(2)AlF_(3)` containing a LITTLE of `CaF_(2)`
BAUXITE ore is purified before CARRYING out the electrolysis
Aluminium being HEAVIER than electrolyte floats over the surface of the latter
Anode consist of a NUMBER of graphite rods which are periodically replaced

Answer :C
Discussion
12968.

Toluene is subjected to Gatterman - Koch reaction produces

Answer»

benzaldehyde
benzoic acid
2- METHYL benzaldehyde
ACETOPHENONE

Answer :C
Discussion
12969.

Write the structures of the major organic product in each of the following:

Answer»

SOLUTION :
Discussion
12970.

Write the names and structure of the monomers of the following polymers: (i) Buna - S (ii) Buna - N (ii) Dacron (iv) Neoporene

Answer»

Solution :(i) Butadiene , `CH_2=CH-CH=CH_2` , STYRENE, `C_6H_5 -CH=CH_2`
(ii) Butadiene , `CH_2=CH-CH=CH_2` , ACRYLONITRILE , `CH_2=underset(CN)underset(|)CH`
(iii) Terephthalic ACID , , ETHYLENE glycol ( Ethane-1,2- diol) `{:(CH_2OH),(|),(CH_2OH):}`
(iv) Chloroprene , `CH_2= underset(Cl)underset(|)C-CH=CH_2`,2-Chloro-1,3- butadine is the monomerof NEOPRENE .
Discussion
12971.

Which one of the following relations is correct with respect to first (I) and second (II) ionization potentials of sodium and Magnesium?

Answer»

`I_(MG)=II_(NA)`
`I_(Na)gtI_(Mg)`
`II_(Mg)gtII_(Na)`
`II_(Na)gtII_(Mg)`

ANSWER :D
Discussion
12972.

Which of the following oxyacids of phosphorus is a reducing agent and monobasic?

Answer»

`XeF_(2)`
`XeF_(4)`
`XeO_(3)`
`XeF_(6)`

Solution :`XeF_(2)overset("Ni tube")(RARR)XeF_(2),Xe+2F_(2)overset(673K)underset(6 ATM)(rarr)XeF_(4)`
`Xe+3F_(2)overset(573-573K)underset(50-60" atom")(rarr)XeF_(6)`
`XeO_(3)` is obtained by the hydrolysis of `XeF_(6)`
`XeF_(6)+3H_(2)OrarrXeO_(3)+6HF`
Discussion
12973.

Which of the following complex is an outer orbital complex?

Answer»

`[NI(NH_(3))_(6)]^(2+)`
`[Mn(CN)_(6)]^(4-)`
`[Co(NH_(3))_(6)]^(3+)`
`[FE(CN)_(6)]^(4-)`

ANSWER :A
Discussion
12974.

Which one of the following is a primary alcohol?

Answer»

`CH_3 - UNDERSET(H)underset(|)OVERSET(H) overset(|)C -OH`
`CH_3 - underset(H)underset(|)overset(CH_3)overset(|)C - OH`
`CH_2 = CH - overset(CH_3) overset(|) CH- OH`
`CH_3 - underset(CH_3)underset(|)overset(CH_3)overset(|)C-OH`

Solution :`CH_3 - underset(H)underset(|)overset(H) overset(|)C -OH`
Discussion
12975.

What happens when ethanoic acid reacts with the following reagents? (i) LiAIH_4 (ii) Red P, HI

Answer»

<P>

SOLUTION :(i) When ethanoic acid reacts by` LiAlH_4`, partial reduction take place and ethanol is formed as a PRODUCT.
`underset{"ethanoicacid")(CH_3-oversetunderset(||)(O)(C )-OH) underset(4[H])overset(LiAlH_4)(to)underset("ethanol")(CH_3 - CH_2OH + H_2O)`
(ii) When ethanoic acid is treated with HI and red PHOSPHOROUS, complete reduction take place and alkane is formed as a product.
`underset("ethanoic acid")(CH_3-oversetunderset(||)(O)(C ) - OH + 6HI) underset(473K)overset(Red P)(to) underset("ethane")(CH_3 - CH_3 + 3I_2 + 2H_2O)`
Discussion
12976.

Which reagent can bring about R-COOH to R-CH_2-OH

Answer»

SN + HCL
`Na+C_2H_5OH`
`H_2` + PT
`LiAlH_4`

ANSWER :D
Discussion
12977.

What is a saturated solution ? What happens if the temperature of the saturated solution incersed ?

Answer»

SOLUTION :It BECOMES unsatureted.
Discussion
12978.

Upto what pH must a solution containing a precipitate of Cr(OH)_(3) be adjusted so that all of precipitate dissolves

Answer»

Upto 4.4
Upto 4.1
Upto 4.2
Upto 4.0

Solution :`K_(sp) = [Cr^(2+)] [ OH^(-)]^(3)`
`[OH]^(-3) = K_(sp//Cr^(3+)) = (6 XX 10^(31))/(1 xx 10^(1)) = 6 xx 10^(-30)`
`[OH^(-)] = 1.8 xx 10^(-10)`
`pOH = (log1.8 + log10^(10)) = 10 + 0.25 + 1 = 11.25`
`pH = 14-11.25 = 2.27`
Discussion
12979.

Which of the following reaction represents major products?

Answer»




SOLUTION :Primary amide and `R-overset(O)overset(||)(C)-NH-Br` GIVE Hoffmann broamamide reaction,
Discussion
12980.

Write the structures of the major organic product in each of the following:

Answer»

SOLUTION :
Discussion
12981.

Which of the following fluro-compounds is most likely to behave as a Lewis base?

Answer»

`BF_3`
`PF_3`
`CF_4`
`SiF_4`

SOLUTION :`BF_3 to` electron DEFICIENT `to` LEWIS acid
`PF_3 to` electron rich `to` Lewis base
`CO to` NEUTRAL `to` neither lewis acid nor base
`SiF_4 to` neutral `to` neither lewis acid nor base
Discussion
12982.

What is an ideal solution ?

Answer»

SOLUTION :An ideal solution is one, which is FORMED with no CHANGE in volume` (Delta V_mix = 0 )` no change in enthalpy` (Delta H_mix = 0 )` and obeys Raoult.s LAW .
Discussion
12983.

Write the structures of the major organic product in each of the following:

Answer»

SOLUTION :
Discussion
12984.

Write the structures of the major organic product in each of the following:

Answer»

SOLUTION :
Discussion
12985.

Write the structures of the major organic product in each of the following:

Answer»

SOLUTION :
Discussion
12986.

When aniline reacts with acetic anhydride the product formed is …………….

Answer»

o-aminoacetophenone
m-aminoacetophenone
p-aminoacetophenone
acetanilide

Solution : `NH_(2)+CH_(3)-overset(O)overset(||)(C)-O-overset(O)overset(||)(C)-CH_(3)toC_(6)H_(5)-NH-COCH_(3)`
Discussion
12987.

Which of the following reagents can be used to separate a mixture of aniline and phenol?

Answer»

`H_(2)O`
NAOH
`NaHCO_(3)`
HCL

Solution : Phenol REACT with base (NaOH) but not HCI, Aniline react with acid (HCl) but not NaOH.
Discussion
12988.

Which of the following compounds would have the smallest value for pK_(a)?

Answer»

`CHF_(2)CH_(2)CH_(2)COOH`
`CH_(3)CH_(2)CF_(2)COOH`
`CH_(2)FCHFCH_(2)COOH`
`CH_(3)CF_(2)CH_(2)COOH`

Solution :`-F` is a strong electron withdrawing group. Electron withdrawing group. Electron withdrawing group PRESENT nearer to the -COOH group has more acidic strength, hence low `pK_(a)` value.
Discussion
12989.

Which one of the following oxidised to corresponding carbonyl compound ?

Answer»




ANSWER :A
Discussion
12990.

Which statements is/are correct about sodium nitroprusside test ?

Answer»

This test is USED for detection of `SO^(2-)` anion .
`H_(2)S` also gives positive test.
Formation of `Na_(2)[Fe(H_(2)O)_(5)NOS]` complex the PRESENCE of `S^(2-)` anion.
Iron has `+2` oxidation STATE in sodiumthionitroprusside complex.

Answer :A::D
Discussion
12991.

Which of the following sets contains thermopastics.

Answer»

Polythene, Bakelite, NYLON 6
Glyptal, Melmac, PAN
PVC, PMMA, Polystyrene
Polypropylene, UREA - formaldehyde, Teflon

Answer :C
Discussion
12992.

Zirconium (Zr) belongs to. ‘4d and Hafnium (Hf) belongs to 5d transition series: It is difficult to separate them. Explain.

Answer»

Solution :DUE to lanthanoid contraction, the atomic radii of Zr and Hf are nearly the same. They also have SIMILAR outer electronic CONFIGURATION. So Zr and Hf SARE very closely related in properties. So they OCCUR together and it is difficult to separate them.
Discussion
12993.

Which metal does not give the following reaction :M +water or steam rarrmetal oxide + H_2 uarr

Answer»

Iron
Sodium
Mercury
Magnesium

Answer :C
Discussion
12994.

The substances whose solubility decreases with increase in temperature :

Answer»

NAOH
`Na_2CO_3`
`Na_2SO_4`
All

Answer :D
Discussion
12995.

What is the name of the reaction when ethanol is treated with Conc. H_2SO_4 at 413 K?

Answer»

ETHENE
ETHANE
2-butanol
DIETHYL ETHER

Solution :Diethyl ether
Discussion
12996.

Which one has highest percentage of nitrogen?

Answer»

Urea
CAN
Ammonium nitrate
Calcium nitrate

Answer :A
Discussion
12997.

Whichof thefollowinghas highestknockingpropery ?

Answer»

AROMATIC HYDROCARBONS
OLEFINS
Breanched CHAIN paraffins
staight chainparaffins

Answer :D
Discussion
12998.

What happens when blood cells are placed in pure water?

Answer»

Solution :Due to OSMOSIS , water molecules MOVE into blood cells through the cell WALLS. As a result, blood cells swell and MAY even BURST.
Discussion
12999.

Write one chemical equation to show that chlorine gas can be obtained from bleaching powder.

Answer»

SOLUTION :`CaOCl_2 + 2HCL RARR CaCl_2 + H_2O + Cl_2`
Discussion
13000.

Vitamin B_(12) contains metal

Answer»

Ca(II)
Zn(II)
Fe(II)
CO(III)

Solution :Co (III) TRANSITION metal is present in VITAMIN `B_(12)`.
Discussion