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7201.

Which of the following statement is incorrect for KMnO_(4)?

Answer»

It is an oxidising agent
It is used as antiseptic
It is used as BLEACHING agent in textile industries
It is dark purple COLOURED AMORPHOUS substance

Answer :D
Discussion
7202.

What is the chemical name of freon?

Answer»

SOLUTION :The CHEMICAL NAME of FREON is Dichlorodifinoromethane.
Discussion
7203.

Treatment of 1-butene with conc. H_2SO_4 followed by treatment with water forms

Answer»

1-butanol
2-butanol
2-propanol
1-2-propan-diol

Solution :ADDITION of water OCCURS according to Markownikoff's RULE
`CH_3CH_2CH=CH_2 OVERSET(H_2O // H_2SO_4)to CH_3CH_2CHOHCH_3`
Discussion
7204.

Which compound most readily forms hydrogen bonds between its molecules in the liquid state?

Answer»

HBr
HF
HCl
HI

Answer :B
Discussion
7205.

Which of the following are bidentate monoanion ligands ? (1) Acetylacetonato (2)Oxalato ion (3) Dimethylglyoxiamato Select the correct answer using the codes given below :

Answer»

1 only
1 and 3 only
3 only
2 and 3 only

Solution :
Discussion
7206.

When alcohol reacts with conc. H_(2)SO_(4), intermediate compound formed is :

Answer»

carbonium ion
alkoxy ion
alkyl hydrogen SULPHATE
CARBANION

Answer :A
Discussion
7207.

Which one of the following compounds when heated with KOH and a primary amine gives carbylaminestest ?

Answer»

`CHCl_3`
`CH_3Cl`
`CH_3OH`
`CH_3CN`

ANSWER :A
Discussion
7208.

The values of DeltaH and DeltaS for the reaction, C_(("graphite"))+CO_(2(g))rarr2CO_((g)) are 170 kJ and 170 JK^(-1), respectively. This reaction will be spontaneous at

Answer»

710 K
910 K
1110 K
510 K

Solution :`DELTAG=DeltaH-TDeltaS`
`0=(170xx10^(3)J)-T(170 JK^(-1))`
T=1000 K
For spontaneity, `DeltaG` is -ve
Hence T should be `gt` 1000 K/
Discussion
7209.

Which one of the following is not a primary amine ?

Answer»

tert-Butylamine
Ethylamine
sec-Butylamine
dimethylamine.

Answer :D
Discussion
7210.

Which defect creates when some P atom is added to Si ?

Answer»

Displacement DEFECT 
Electron defect 
Metal deficiency defect 
Metal EXCESS defect 

ANSWER :B
Discussion
7211.

Which of the following metals forms grignard reagent?

Answer»

Magnesium
Calcium
Barium
Strontium

Answer :A
Discussion
7212.

The two half cell reactions of an electrochemical cell is given as thevalueof cellEMFwill be

Answer»

`-0.3125 V`
`0.3125 V`
`1.114 V`
`-1.114V`

SOLUTION :As perthe reductionpotentialvalues,Agwill ACTAS cathodeand Fewill actasanode
Cellreactionswill be
Discussion
7213.

You are given a 2.198 - g samplecontaining a mixture of XO and X_(2)O_(3) .It requires 0.015 mol of K_(2)Cr_(2)O_(7) to oxidise the samplecompletely to form XO_(4)^(-) and Cr^(3+) .If 0.0817 mole XO_(4)^(-)is formed ,what isthe atomic mass of X?

Answer»

Solution :
Applying POAC for X atomsof atomic mass say x ,
MOLE of `XO+2xx` mole of `X_(2)O_(3) `mole of `XO_(4)^(-)`
`m/(x+16) +(2(2.198 -m))/(2x+48) = 0.0187 ""…(1)`
Applying law of equivalence ,
eq. of XO + eq. of `X_(2)O_(3) = " eq. of " K_(2)Cr_(2)O_(7)`
`m/(x+16) xx 5 + ((2.198 -m))/(2x+48) xx 8 = 0.015 xx 6""...(2)`
SOLVING eqns . (1) and (2),
x = `100.04`
Discussion
7214.

The unit cell of a metallic element of atomic mass 10^(8) and density 10.5 g/cm^(3) is a cube with edge length of 409 PM. The structure of the crystal lattice is - (A) fcc (B) bcc (C) hcp (D) None of these

Answer»

Solution :(A)
`RHO=(ZxxM)/(Nxxa^(3))`
Here,M=108, `N_(A)`=6.023xx10^(23)`
Put on these values and solving we GET- a=409 PM=`4.09xx10^(-8)` cm.
`rho=10.5 g//cm^(3)`
n=4= number of ATOMS per unit CELL So, The structure of the crystal lattice is fcc.
Discussion
7215.

Which of the following reacts with NaOH to produce an acid and alcohol ?

Answer»

`HCHO`
`CH_3 COOH`
` CH_3 CH_2COOH`
` C_6H_5COOH `

ANSWER :A
Discussion
7216.

Which of the following is correct.

Answer»

`{:("CRYSTAL system","Axial DISTANCE","Axial angles","Examples"),("Cubic",aneb=c,alpha=betanegamma=,Cu","KCl):}`
`{:("Crystal system","Axial distance","Axial angles","Examples"),("Monclinic",aneb=c,alpha=beta=gamma=90^(@),PbCrO_(2)):}`
`{:("Crystal system","Axial distance","Axial angles","Examples"),("Rhombohed",a=b=c,alpha=beta=gammane90^(@),CaCO_(3)HgS):}`

SOLUTION :Rhombohedral crystal system
`a=b=c, alpha=beta=gammane90^(@)`
Discussion
7217.

The volume of 0.1 M Ca(OH)_2required toneutralize 10 mL of 0.1 N HCI

Answer»

10 mL
20 mL
5ML
15mL

Solution :`0.1 M Ca(OH)_2 = 0.2 N Ca (OH)_2`
APPLYING `N_1V_1 = N_2V_2`
`0.2 XX V_1 = 0.1 xx 10`
` V_1 = (0.1 xx 10)/(0.2) =5mL`
Discussion
7218.

XeF_6 +MF to M^(+) [XeF_7]^(-) . Here "M" is

Answer»

ALKALI METALS
Alkaline EARTH metals
TRANSITION metals
Inner transition metals

Answer :A
Discussion
7219.

Who explained the action of catalyst in adsorption theory?

Answer»

Berzellius
LANGMUIR
Thomas Graham
Dalton

SOLUTION :Langmuir
Discussion
7220.

Which of the following relation is correct ? (i) x/ = constant at high pressure (ii) x/m = constant xx p^(1//n) (at intermediate pressure) (iii) x/m = constant xxp^(n) (at lower pressure)

Answer»

all are CORRECT
all are WRONG
(i) and (II) are correct
(III) is correct

SOLUTION :(iii) is not correct.
Discussion
7221.

Which ions can be tested in a solution of Mohr's salt?

Answer»

Solution :Composition of Mohr.s salt is `FeSO_(4) (NH_(4))_(2)SO_(4).6H_(2)O`. It is a double salt. It undergoes complete ionisation when DISSOLVED in water.
Thus its AQUEOUS solution gives test for `Fe^(2+), NH_(4)^(+)` and `SO_(4)^(2-)` ions.
Discussion
7222.

The solubility of Sb_(2)S_(3) in water is 1.0 xx 10^(-5) mole/litre at 298 K. What will be its solubility product

Answer»

`108 xx 10^(-25)`
`1.0 xx 10^(-25)`
`144 xx 10^(-25)`
`126 xx 10^(-24)`

Solution :`{:(Sb_(2) rarr,2Sb^(+2)+,3S^(-),,K_(sp) = (2x)^(2).(3x)^(3),),(,2x,3x,,):}`
`K_(sp) = 108x^(5), K_(sp) = 108 xx (1 xx 10^(-5))^(5) = 108 xx 10^(-25)`.
Discussion
7223.

Which of the following halogen acids has the lowest melting point:

Answer»

HF
HCl
HBr
HI

Answer :B
Discussion
7224.

What is the basic structural difference between glucose and fructose ?

Answer»

Solution :GLUCOSE has aldehydic GROUP while FRUCTOSE has ketonic group/Glucose is ALDOSE while fructose is ketose.
Discussion
7225.

What is the effect of adding a catalyst on activationenergy (E_(a)) ?

Answer»

Solution :Activation ENERGY is lowered on ADDING a CATALYST.
Discussion
7226.

Tritium, ""_1^3His a radioactive nucleus of hydrogen. It is used in luminous watch dials. Tritium decays by beta emission with a half-life of 12.3 years. What is the decay constant (in s^(-1) )? What is the activity (in Ci) of a sample containing 2.5 mugof tritium? The atomic mass of tritium is 3.02 amu.

Answer»

SOLUTION :`1.79 XX 10^(-9) // s , 0.024 CI`
Discussion
7227.

What is the major product when anisole is treated with Br_(2) in ethanoic acid?

Answer»

SOLUTION :p-bromoanisole
Discussion
7228.

What is sulfa drug? Name the key compounds of sulfa drugs.

Answer»

Solution :Sulfa drugs are the compounds used to ACT against microorganisms for CURING diseases. The key compounds from which sulfa drugs are synthesised are sulfanilic acid and SULFANILAMIDE.
Discussion
7229.

Which scientists' names are associated with the isolation of aluminium from its ore?

Answer»

SOLUTION :HALL and HEROULT.
Discussion
7230.

What is electronic arrangement of metal atom/ion in octahedral complex with d^(4) configuration, if Delta_(0) ltpairing energy?

Answer»

`t_(2g)^(4)e_(G)^(0)`
`e_(g)^(4)t_(2g)^(0)`
`t_(2g)^(3)e_(g)^(1)`
`e_(g)^(2)t_(2g)^(2)`

Solution :
Discussion
7231.

Which one of the following reaction is an example of free radical substitution reaction?

Answer»




ANSWER :D
Discussion
7232.

The value of PV for 5.6 litres of an ideal gas is.. RT, at N.T.P.

Answer»

SOLUTION :APPLY `=(PV)_(MAX) =nRT_("max")`
Discussion
7233.

The strength of van der Waals' forcesincrease with :

Answer»

INCREASE in molecular size
Increase in the number of ELECTRONS in the molecule
Increase in molecular weight
All of these

Answer :D
Discussion
7234.

The units of molar conductivity are :

Answer»

`ohm^(-1)CM^(-2) mol^(-1)`
`ohm^(-2)cm mol^(-2)`
`ohm^(-2)cm^(2) mol^(-1)`
`ohm^(-1)cm^(2) mol^(-2)`

ANSWER :C
Discussion
7235.

Which statement about molecularity of a reaction is wrong:

Answer»

It is the NUMBER of molecules of the REACTANTS taking part in a single STEP of reaction
It is calculated from the reaction mechanism
It may be either whole number or fractional
None

Answer :C
Discussion
7236.

Which of the following reactions does not involve decarboxylation?

Answer»

`CH_(3)COOAg+Br_(2)OVERSET(C Cl_(4))underset(DELTA)rarr`


Answer :D
Discussion
7237.

Which of the following will liberate CO_(2) on reaction with NaHCO_(3)

Answer»


`CH_(3)COOH`

SOLUTION :ACIDS which are stronger than `H_(2)CO_(3)` can librate `CO_(2)` on treatment with `NaHCO_(3)`
Discussion
7238.

Whose elevation in boiling point will be the same as for 0.1 m KNO_(3) ?

Answer»

0.1 m UREA
0.1 m POTASSIUM SULPHATE
0.1 m Sodium chloride
0.1 m ALUMINIUM nitrate

Answer :C
Discussion
7239.

Which of the following substance is not an antioxidant ?

Answer»

ASCORBIC acid
Sorbic acid
Citric acid
BHT 

ANSWER :B
Discussion
7240.

X is a non- volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X in Y {:("X/mol lit"^(-1),"Y/mm of Hg"),(0.10,P_1),(0.25,P_2),(0.01,P_3):} The correct order of vapour pressure is

Answer»

`P_1 LT P_2 lt P_3`
`P_3 lt P_2 lt P_1`
`P_3 lt P_1 lt P_2`
`P_2 lt P_1 lt P_3`

ANSWER :D
Discussion
7241.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the per-exponential factor for the reaction is 3.56xx10^(9)s^(-1), calculate its rate constant at 318 K and also the energy of activation.

Answer»

SOLUTION :`t_(1)=(2.303)/(k_(1))log""(a)/(a-0.10a),t_(2)=(2.303)/(k_(2))log""(a)/(a-0.25a)`
As `t_(1)=t_(2),(2.303)/(k_(1))log""(a)/(0.90a)=(2.303)/(k_(2))log""(a)/(0.75a),(k_(2))/(k_(1))=(log(100//75))/(log(100//90))=2.73`
But `log(k_(2))/(k_(1))=(E_(a))/(2.303" R")((T_(2)-T_(1))/(T_(1)T_(2)))`
Putting `k_(2)//k_(1)=2.73,R=8.314" J K"^(-1)mol^(-1),T_(1)=298" K",T_(2)=308" K, we get "E_(a)=76.6" KJ mol"^(-1)`
Further, `k="Ae"^(-E_(a)//"RT")" or "logk=log A-(E_(a))/(2.303" RT")`
Putting `A=3.56xx10^(9)s^(-1),R=8.314xx10^(-3)"kJ K"^(-1)mol^(-1),E_(a)=76.6" kJ mol"^(-1),T=318" K",` we get
`k=9.3xx10^(-4)s^(-1)`
Discussion
7242.

The type of forces present among halogen molecules

Answer»

H- bonds
Covalent bonds
Vandar WAAL 's FORCE
IONIC bond

Answer :C
Discussion
7243.

What are synthetic detergents ? Give one example.

Answer»

SOLUTION :Synthetic detergents are CLEANSING agents which have all the properties of soap but which actually do not contain any soap. These can be used in both soft and hard water.
CATIONIC detergents such as cetyltrimethyl AMMONIUM bromide and anionic detergents such as sodium laurylsulphate. Non-ionic detergents such as polyethylene GLYCOL stearate.
Discussion
7244.

Whichof the following is not true ?

Answer»

In vulcanization , the FORMATION of sulphur bridge between different CHAINS make rubber hard and STRONG
Natural rubber has trans configuration at vinyl DOUBLE bond
Buna-N is a copolymer of 1,3 - butadine and vinyl cyanide
Natural rubber is a 1,4 -polymer of ISOPRENE

Answer :B
Discussion
7245.

Which one of the following acids has highest heat of neutralization with one equivalent of NaOH?

Answer»

`HCL`
`HF`
`H_2SO_4`
`HCN`

ANSWER :C
Discussion
7246.

Two compounds each containing only tin and oxygen had the following composition: {:(,"Mass % of tin","Mass % of oxygen"),("Compound A",78.77,21.23),("Compound B",88.12,11.88):} Show how this data illustrate the law of multiple proportions?

Answer»

Solution :In compound A
21.23 parts of oxygen combine with 78.77 parts of tin 1 part of oxygen combines with 78.77/21.23=3.7 parts of tin
In compound B
11.88 parts of oxygen combine with 88.12 parts of tin
1 part of oxygen combines with 88.12/11.88=7.4 parts of tin Thus, the mass of tin in compound. A and B which combine with a fixed mass of oxygen are in the ratio of 3.7:7.4
or 1:2. this is a SIMPLE ratio. HENCE, the DATA ILLUSTRATE the law of MULTIPLE proportions.
Discussion
7247.

Which resonating structure is most stable?

Answer»





Solution :Dut to LESS distance between TWO oppostiting charge and its aromatic NATURE and `NO_(2)^(-)` alos have-1 effect which stabilize it.
Discussion
7248.

Which metal is not used for making coins ?

Answer»

Gold
Silver
Nickel
Tungsten

Answer :D
Discussion
7249.

Which of the following following IUPAC names are correct :

Answer»



, `4-`FORMYL`-2-`sulphobenzoic acid
, `2-`BROMO`-6-`chlorophenol

Solution :Correct NAME of `(A)` is `2-`METHYLBUTANE`-1,4-`diamine.
Discussion
7250.

Whatare essentialand non - essentaialamino acids ?Givetow exampleof eachtype .

Answer»


Solution :Essential amino aicds : Amino acids whichcannotbe synthesisedin the BODY ad mustbeobtainedthrough REGULAR dietare know asesentialaminoacids . FOREXAMPLE:VALINE , Leucine .
Non - essentialaminoacids: Theaminoacids whichcan be synthesised in the body by itself areknown as non - essential amino acids . For example : GLYCINE, alanine .
Discussion