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4451.

Which property increases in magnitude as the atomic number of alkali metals increases ?

Answer»

Electronegativity
First IONIZATION energy
Ionic radius
Melting point

Answer :C
Discussion
4452.

Which of the following properties displays progressive increase down the group in the periodic table?

Answer»

Electronegativity
Ionisation enthalpy
Electron GAIN enthalpy
Size of the atom.

Answer :D
Discussion
4453.

When the value of entropy is greater, then the ability for work is

Answer»

maximum
minimum
medium
any of these.

Solution : As `Delta S = Q/T`and work DEPENDS on q. Therefore the CHANGE `Delta S`will be more when the q or w will be more.
Discussion
4454.

Write the relationship between standard free energy change and the equilibrium constant of a reaction. What is the sign of standard free energy change when the equilibrium constant is less than one?

Answer»

SOLUTION :`Delta G^@=-RT In K_p`
OR `Delta G^@=-2.303 RT LOG K_p`
`Delta G^@` is POSITIVE.
Discussion
4455.

Which of the following upon treatment with tert-BuONa the colour of bromine?

Answer»




SOLUTION :.
Discussion
4456.

You are provided withthe followingDeltaG^(@)values:S_ 8+2 O _2to2 SO_2 , DeltaG^(@)at 1073K=-544 kJ2Zn+ S_2 to2ZnS , Delta G^(@)at1073K= -293kJ2Zn + O _2 to2 ZnO ,DeltaG^(@)at1073K =-480kJCalculateDeltaG^(@)at1073 K forthefollowingreaction at thisremperature, 2ZnS +3O _2to2 ZnO+2 SO _2andpredictwhether thisreactionis thermodynamically feasibleor not.

Answer»

Solution :THEFREE ENERGY`(Delta_ rG ^(@) ) `ofthereaction=`Delta G ^(@) ` ( products )-`Delta G^(@) ` (reactants)
` ""=Delta G ^(@) ( Zn O )+[ DeltaG^(@) (SO_2 ) ] -Delta G^(@)(ZNS) `
`""=(-480)+(-544) - (-293) KJ`
`""=-1024 +293 k J=-731 k J`
Since` Delta _ rG^(@) `ofthereaction- ve,therefore, thisreactionisfeasibleat1073 K.
Discussion
4457.

Which one is antihistamine drug?

Answer»

Cimetidine (TEGAMET) 
Ranitidine (zantac)
(A) and (B) both 
ASPIRIN 

Solution :(A) and (B) both
Discussion
4458.

The structure of the compound that gives a tribromo derivation on treatment with bromine water is

Answer»




SOLUTION :
Discussion
4459.

Which of the following does not react with xenon to form compounds

Answer»

`OSeF_5`
`OTeF_5`
`F_2`
`N_2`

ANSWER :D
Discussion
4460.

True order of bond angle among group -16 hydrides is

Answer»

`H_(2)O gt H_(2)S gt H_(2)SE gt H_(2) TE`
`H_(2) Te gt H_(2) Se gt H_(2) S gt H_(2)O`
`H_(2)S gt H_(2)O gt H_(2) Se gt H_(2) Te`
`H_(2) O gt H_(2)S gt H_(2) Te gt H_(2) Se`

Answer :A
Discussion
4461.

Which sweetening agent are used to prepare sweets for a diabetic patient?

Answer»

Solution :Artificial SWEETENING AGENTS such as,
(i) saccharin
(ii) ALITAME
(iii) Aspartame
can be USED in preparing sweets for DIABETIC patients.
Discussion
4462.

The relationship between mole fraction (X_(A)) of the solute & molality 'm' of its solution in ammonia would be

Answer»

`(55.56 (X_(A)))/(1 - X_(A)) = m`
`(58.82 (X_(A)))/(1 - X_(A)) = m`
`(58.82 (1 - X_(A)))/(X_(A)) = m`
`(55.56 (1 - X_(A)))/(X_(A)) = m`

ANSWER :B
Discussion
4463.

Which of the following alkanes cannot be synthesised by the Wurtz reaction in a good yield ?

Answer»

`(CH_(3))_(2) CH- CH_(2) - CH (CH_(3))_(2)`
`(CH_(3))_(2) CH- CH_(2) - CH_(2) - CH (CH_(3))_(2)`
`CH_(3) - CH_(2) C(CH_3)_(2) CH_2 CH_3`
`(CH_(3))_(2) C - CH_(2) - CH_(2) - CH_(3)`

Solution :These molecules are unsymmetrical and having ODD NUMBER of C -atoms .
Discussion
4464.

Which of the following pairs are epimers

Answer»




ANSWER :C
Discussion
4465.

Which compound shows hydrogen :

Answer»

HCI
`C_2H_6`
`RCH_2CHO`
`RCH_2NHCH_3`

ANSWER :B
Discussion
4466.

Which of the following is not an oxidizing agent ?

Answer»

`SO_(2)`
`H_(2)SO_(4)`
`HNO_(3)`
`H_(3)PO_(4)`

SOLUTION :`H_(3)PO_(4)` is stable.
Discussion
4467.

Which possesses highest percentage of ionic character:

Answer»

HCl
HBr
HF
HI

Answer :C
Discussion
4468.

When H_2S is passed through the HCl containing aqueous solution of CuCl_2 HgCl_2 BiCl_3 and CoCl_2, it does not precipitate out

Answer»

CuS
Hgs
`Bi_2S_3`
 CoS

Answer :D
Discussion
4469.

Which of the following is an indian salt petre?

Answer»

NaCl
`NaNO_(3)`
KCL
`KNO_(3)`

ANSWER :D
Discussion
4470.

The stability of complexes depends upon stability constant. Higher the value of stability constant, more will be stability of complex. It can also be determined with the help of dissociation constant. Higher the value of dissociation constant, lesser will be stability. Smaller cation, with higher charge can form more stable complex. Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect. Which of the following exist as dimer?

Answer»

`Al(CH_(3))_(3)`
`CH_(3)Li`
`Si(CH_(3))_(4)`
`Be(CH_(3))_(2)`

ANSWER :A
Discussion
4471.

The stability of complexes depends upon stability constant. Higher the value of stability constant, more will be stability of complex. It can also be determined with the help of dissociation constant. Higher the value of dissociation constant, lesser will be stability. Smaller cation, with higher charge can form more stable complex. Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect. Which of the following is most stable?

Answer»

`[Co(en)_(3)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(3+)`
`[CoF_(6)]^(3-)`

ANSWER :A
Discussion
4472.

The stability of complexes depends upon stability constant. Higher the value of stability constant, more will be stability of complex. It can also be determined with the help of dissociation constant. Higher the value of dissociation constant, lesser will be stability. Smaller cation, with higher charge can form more stable complex. Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect. Which of the following compound is liquid at room temperature:

Answer»

`Cr(CO)_(6)`
`[Co(CO)_(4)]_(2)`
`Mn_(2)(CO)_(10)`
`Ni(CO)_(4)`

ANSWER :D
Discussion
4473.

The stability of complexes depends upon stability constant. Higher the value of stability constant, more will be stability of complex. It can also be determined with the help of dissociation constant. Higher the value of dissociation constant, lesser will be stability. Smaller cation, with higher charge can form more stable complex. Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect. Formation of complex involves.

Answer»

exothermic, DECREASE in ENTROPY
ENDOTHERMIC, decrease in entropy
exothermic, increase in entropy
endothermic, increase in entropy

ANSWER :A
Discussion
4474.

The total number of identical spheres required in cubic close packing arrangementof a unit cell is

Answer»

6
8
12
14

Solution :It is a FACT.
Discussion
4475.

Which of the followingcompound are having white ppt ?

Answer»

`K_(2)FE[Fe(CN)_(6)]`
`[Fe(H_(2)O)_(3)(SCN_(1))]^(2+)`
`ZnS`
`ZN(OH)_(2)`

Answer :a,c,d
Discussion
4476.

The stability of complexes depends upon stability constant. Higher the value of stability constant, more will be stability of complex. It can also be determined with the help of dissociation constant. Higher the value of dissociation constant, lesser will be stability. Smaller cation, with higher charge can form more stable complex. Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect. Which of the following is called Wilkinson's catalyst?

Answer»

<P>`[(PH_(3)P)_(3)Rh]Cl`
`TiCl_(4) + (C_(2)H_(5))_(3)Al`
`(C_(2)H_(5))_(4)Pb`
`[PtCl_(2)(NH_(3))_(2)]`

Answer :A
Discussion
4477.

Write the chemical formula of PCI_5 (s).

Answer»

SOLUTION :`PCl_5` EXISTS as an IONIC COMPOUND in solid state . It has the STRUCTURE `[PCl_4]^(+)[PCl_6]^(-)` .
Discussion
4478.

Write shorthand notation for the cell for each of thefollowing reactions :(a) Cu_((aq))^(2+) + 2Ag_((s)) + 2Br_((aq))^(-) to Cu_((s)) + 2AgBr_((s)) (b) Sn_((aq))^(2+) is oxidized by Br_(2(1))

Answer»

Solution :(a) `Cu_(aq)^(2+) + 2AG_((s)) + 2Br_(aq)^(-) to Cu_(s) + 2AgBr_((s))`
`2Ag_((s)) + 2Br_((aq))^(-) to 2AgBr_((s)) + 2e^(-)`(Oxidation HALF reaction at ANODE )
`Cu_((aq))^(2+) - 2e^(-) to Cu_((s))` (Reducation half reactionat cathode)
Hencethe CELL is ,
`Ag_((s)) |AgBr_((s)) |Br_((aq))^(-) (1M) || Cu_((aq))^(2+)(1M) |CU`
(b)`Sn_((aq))^(-) + Br_(2(l)) to Sn_((aq))^(4+) + 2Br_((aq))^(-)`
`Sn_((aq))^(2+) to Sn_((aq))^(4+) + 2Br_((aq))^(-)` (Oxidation halfreactionatanode)
`Br_(2(l)) + 2^(-) to 2Br^(-)`(Reductin halfreactionat cathode).
Hencethe cell is ,
`Pt| Sn_((aq))^(2+),Sn_((aq))^(4) || Br_((aq))^(-) | Br_((aq))^(-) | Pt `
Discussion
4479.

When alcoholic solution of ethylene dibromide is heated with granulated zinc, the compound formed is

Answer»

Ethylene<BR>Ethyne
Cyclobutane
Butane

Solution :`undersetunderset(Br)(|)CH_2-undersetunderset(Br)(|)CH_2+Zn to ZnBr_2 + CH_2 =CH_2`
Discussion
4480.

The salt Al(OH)_(3) involved in the following two equilibria. Al(OH)_(3)(s)hArrAl^(3+)(aq)+3OH^(-)(aq),K_(sp) Al(OH)_(3)(s)+OH^(-)(aq)hArrAl(OH)_(4)^(-)(aq),K_(c) Which of the following relationship is CORRECT at which solubility is minimum?

Answer»

`[OH^(-)]=((K_(sp))/(K_(c)))^(1//3)`
`[OH^(-)]=((K_(c))/(K_(sp)))^(1//3)`
`[OH^(-)]=SQRT(((K_(sp))/(K_(c)))^(1//4))`
`[OH^(-)]=((3K_(sp))/(K_(c)))^(1//4)`

Answer :d
Discussion
4481.

Which of the following vitamin is insoluble in water and fat both ?

Answer»

C
K
H
E

Answer :C
Discussion
4482.

Which one of the following is a secondary alcohol?

Answer»

2 - Methyl - 1 - propanol
2 - Methyl - 2 - propanol
2 - Butanol
1 - Butanol

Answer :C
Discussion
4483.

The work done by the gas liberated when 50 g of iron (molar mass 55.85 g mol^(-1)) reacts with hydrochloric acid in an open beaker at 25^(@)C

Answer»

ZERO
`-2.2 KJ`
2.2 kJ
0.22 kJ

Solution :`W=-PV=-nRT`
`w=-(50)/(55.85)xx8.314xx298`
`w=-2218.05 =-2.218 kJ`
Discussion
4484.

Which of the following carbocations would not likely rearrange to more stable carbocation ?

Answer»




NONE of these

ANSWER :B
Discussion
4485.

Which poisonous compound is formed if Chloroform is kept in open air ?

Answer»

Phosphine
PHOSGENE
Freone
Carbon TETRACHLORIDE

ANSWER :B
Discussion
4486.

The second and third rows of rows of transition elements resemble each other much more than they resemble the first row. Explain why?

Answer»

Solution :Due to LANTHANOID contraction, the ATOMIC radii of second and third ROW transition elements become ALMOST equal. HENCE, they resemble each other much more as compared to first row elements.
Discussion
4487.

The smallest cation and the smallest anion are respectively

Answer»

`H^(+) and H^(-)`
`H^(+) and F^(-)`
`LI^(+) and H^(-)`
`Li^(+) and F^(-)`

ANSWER :B
Discussion
4488.

Write the formula of the following coordination compound Tetraammine diaquacobalt (III)chloride

Answer»

SOLUTION :`[CO(NH_3)_4(H_2O)_2]Cl_3`
Discussion
4489.

When mangnese dioxide is fused with KOH in air, it gives

Answer»

POTASSIUM permangante
Potassium manganate
manganese hydroxide
managanese sesquioxide

Answer :B
Discussion
4490.

Which hydroxide will have lowest value of solubility product at normal temperature ?

Answer»

`Mg(OH)_(2)`
`Ca(OH)_(2)`
`BA(OH)_(2)`
`Be(OH)_(2)`

ANSWER :4
Discussion
4491.

Which of the following is not used as antioxidant in food ?

Answer»

Buthlated p-hydroxy anisole
`Na_(2)SO^(4)`
ALITAME
`NaHSO^(4)`

Answer :C
Discussion
4492.

X overset(O_(3)//Zn)rarr , The IUPAC name of compound Y is :

Answer»

`2`-Cyclohexylbutane
`1`-Methylpropylcyclohexane
Butylcyclohexane
`1`-Cyclohexylbutane

Solution :N//A
Discussion
4493.

What is the mass (in grams) of an aluminium block whose dimensions are "2.0 in."xx"3.0 in."xx"4.0 in." and whose density is 2.7g//cm^(3)? Given that 1 in. = 2.54 cm.

Answer»

Solution :Here, unit CONVERSION FACTORS are `1=(2.54cm)/("1 in.")=("1 in")/(2.54cm)`
Hence, required mass (in g) `= "2.0 in"XX"3.0 in"xx"4.0 in"xx(2.54cm)/("1 in")xx(2.54cm)/("1 in")xx(2.54cm)/("1 in")xx(2.7g)/(1cm^(3))=1.1xx10^(3)g.`
Discussion
4494.

The standard heat of formation of H_2O_((l)) from its elements is –285.83 kJ. "mole"^(-1)and the standard entropy change for the same reaction is -327 JK^(-1) at 25^@C. Will the reaction be spontaneous at 25^@C ?

Answer»

SOLUTION :`DELTA G_r^@` = - ve` , SPONTANEOUS
Discussion
4495.

Write the name of monomers used for getting the following polymers : (i) Teflon, (ii) Buna-S.

Answer»

SOLUTION :(i) TETRAFLUOROETHENE.
(II) 1, 3-butadiene and STYRENE.
Discussion
4496.

Under which of the following conditions, conductance, sp. Conductance and eq. conductance are all equal ?

Answer»

1000 cc of the SOLUTION CONTAINS 1 eq. of the ELECTROLYTE
100 cc f the solution contains 1 eq. of the electrolyte
10 cc of the solution contains 1 eq. of the electrolyte
1 cc of the solution contains 1 eq. of the electrolyte

Answer :D
Discussion
4497.

Watersolubleof vitamins must besupplied regularly in dietbecausethey aredietbecause theyare readity excreted in urine.

Answer»


ANSWER :1
Discussion
4498.

What are the IUPAC names of the insecticide DDT and benzenehexachloride ? Why is their use banned in India and other countries ?

Answer»

Solution :
These substances are NON bio DEGRADABLE and are highly toxic. Beside this, they GET STORED in a fatty tissues and their concentration keeps increasing in the food chain.
Discussion
4499.

Urea reacts with hydrazine to give:

Answer»

SEMICARBAZIDE
PHENYLHYDRAZINE
URETHAN
NITROGEN

ANSWER :A
Discussion
4500.

Which of the following process is used in the extraction of metallurgy of magnesium ?

Answer»

FUSED SALT electrolysis
salt reduction
aqueous SOLUTION electrolysis
thermite reduction

Answer :A
Discussion