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14601.

Which among the following is the correct statement regarding diethyl ether?

Answer»

Undergoes nitration
high BOILING LIQUID
With HI forms phenol and `CH_(3)I`
Forms PEROXIDE in air.

Answer :d
Discussion
14602.

Which of the following is not a characteristic of open - hearth process

Answer»

The QUALITY of steel obtained is very high
Composition of steel can be controlled
A blast of air is used in the furnace
Iron SCRAP and lower GRADE pig iorn can be used

ANSWER :C
Discussion
14603.

When acrystal structure of NaCl type is pressurised

Answer»

The coordination NUMBER is decreased to 8 and converted to CsCl type crystal structure
The coordination number is REMAINS same
The coordination number is increased to 8 and converted to CsCl type crystal structure
The coodination number is increased to 4 and coverted to ZNS type crystal structure

Answer :C
Discussion
14604.

Urea is a better fertilizer than ammonium sulphate because :

Answer»

Urea is highly SOLUBLE in water while ammonium sulphate is insoluble
Ammonium sulphate MAKES SOIL alkaline
Urea supplies the correct amount of nitrogen required for PLANT growth
Urea is a CHEAP fertilizer

Answer :B
Discussion
14605.

Who is the father of Co-ordination Chemistry ?

Answer»

SOLUTION :ALFRED WERNER.
Discussion
14606.

Which of the following compounds can be used for drying of H_(2)S gas?

Answer»

Conc. `H_(2)SO_(4)`
`P_(2)O_(5)`
fused `CaCl_(2)`
anhydrous `Al_(2)O_(3)`

Answer :B::C::D
Discussion
14607.

The treatment of acylazide (RCON_(3)) with acidic or alkaline medium gives.

Answer»

`RCONH_(2)`
`R-NH_(2)`
`RCH_(2)NH_(2)`
`RCOCH_(2)NH_(2)`

SOLUTION :This is known as 'Curtius reaction'. This involves pyrolysis of acid azide to form isocyanate which produces `1^(@)` amine on hydrolysis.
`R-overset(O)overset(||)(C)-N-=Nunderset(-N_(2))overset(Delta)rarrR-N=C-Ounderset(-CO_(2))overset(H_(2)O)rarrRNH_(2)`
Discussion
14608.

Which metal among following has strongest tendency to undergo oxidation

Answer»

Zn
Cu
MG
Al

Solution :Mg , because of its HIGH HYDRATION ENERGY.
Discussion
14609.

Which of the following statement is incorrect about the complex ion [Pt(en)_(2)Cl_(2)]^(2+) ?

Answer»

It has TWO geometrical ISOMERS-cis and trans.
Both the cis and trans isomers display OPTICAL activity.
Only the cis isomer displays optical activity.
Only the cis isomer has non-superimposable mirror image.

Answer :B
Discussion
14610.

What do prefixes (+),(-) and (+-) before an organic compound mean?

Answer»

SOLUTION :Prefixes (+),(-) and `(+-)` imply dextrorotatory, LAEVOROTATORY and racemic MODIFICATION RESPECTIVELY.
Discussion
14611.

What happens when ethane reacts with nitric acid at 400^@C ?

Answer»

SOLUTION :`C_2H_6 + HNO_3 OVERSET(400^@C)rarrC_2H_5NO_2 + H_2O`
Discussion
14612.

Which of the following deactivatesbenzene substitution ?

Answer»

`-NHR`
`-COOR`
`-OH`
`-OR`

ANSWER :B
Discussion
14613.

Whichof the following has weak molecular forces?

Answer»

Nylon-6
Nylon-66
silk
Buna-S

ANSWER :D
Discussion
14614.

Which one of the following arrangementdoes not truly represent the propertyindicated againstit ?

Answer»

`Br_(2) lt Cl_(2)lt F_(2)` Oxidising power
`Br_(2) lt Cl_(2) lt F_(2)` Electronegativity
`Br_(2) lt F_(2) lt Cl_(2)` Electron affinity
`Br_(2) lt Cl_(2)lt F_(2)` Bondenergy

Solution :Shond dissociation enthalphy of halogen follows the sequnecy as
`Cl_(2) gt Br gt F_(2) gt I_(2)`
Enthalpy of dissociation decreasss as the bond distance increases from `F_(2)` to `I_(2)` due to a correspondingincreases in size of the atom as one MOVE down the group from F to i. HOWEVER, the F.F bond dissociation enthalpy is smaller than that of `Cl-Cl` (even than that of Br-Br) because repulsion between the lons pairs of electrons are very LARGE.
Discussion
14615.

What happens when phenol is distilled with zinc dust ?

Answer»

Toluene
Benzene
Xylene
none of the above

Answer :B
Discussion
14616.

Which of the following compounds is the weakest bronsted base?

Answer»




Solution :Amines (a,B) have a stronger tendency to accept a PROTON and hence are stronger bronsted bases than phenol (c) and alcohol (d). Since phenol is more ACIDIC than alcohol, THEREFORE, phenol (c) has the least tendency to accept a proton and hence it is the weakest brosted base.
Discussion
14617.

Which electronic configuration corresponds to minimum energy and maximum stability ?

Answer»

`(n-1)d^(10)ns^(1)`
`(n-1)d^(5)ns^(1)`
`ns^(2)np^(6)`
`ns^(2)np^(3)`

Solution :Being most stable due to fully filled electronic configuration `(ns^(2)np^(6))` nobles gases have minimum ENERGY and maximum STABILITY.
Discussion
14618.

Which of the following statement is not true for halogens

Answer»

All do not form MONOBASIC oxyacids
all are oxidizing agents
all but fluorine SHOW positive oxidation states
Chlorine has the highest electron-gain enthalpy

Solution :HOWEVER HOF is the only known oxyacid of fluorine but it is unstable at room temperature FORMING HF and `O_(2)`. So we can say that all halogens except fluorine form monobasic oxyacids.
Discussion
14619.

What do you mean by saying that the molality of a solution is 0.1?

Answer»

Solution :It means that 0.1 MOL of the SOLUTE is dissolved in 1 kg of the solvent.
Discussion
14620.

Which of the following can possibly be used as analgesic without causing addiction and modification?

Answer»

Morphine
N - ACETYL - PARA - aminophenol
Diazepam
Tetrahydrocatenol

Answer :B
Discussion
14621.

What is distillation?

Answer»

SOLUTION :(i) Distillation is employed for low boiling volatile metals like zinc (boiling point 1180K) and mercury (630K).
(ii) In this method, the IMPURE METAL is heated to evaporated and the vapours are condensed to get pure metal.
Discussion
14622.

The value of K_(p) for the following reaction 2H_(2)S_((g))hArr2H_(2(g))+S_(2(g))is 1.2xx10^(-2)at 106.5^(@)C. The value of K_(c) for this reaction is

Answer»

`1.2xx10^(-2)`
`lt1.2xx10^(-2)`
83
`gt1.2xx10^(-2)`

Solution :`K_(p)=K_(c)(RT)^(DELTAN),Deltan=1`
`So, K_(c)"will be less than"K_(p),`
Discussion
14623.

When acetone reacts with trichloromethane in the presence of KOH, the product formed is

Answer»

Chloropicrin
Chloretone
`"CCL"_(4)`
Trichlorocacetone.

Answer :B
Discussion
14624.

Vinegar contains:

Answer»

10 to `20%` acetic acid
`10%`acetic acid
6 to `10%acetic acid
`100%` acetic acid

Answer :C
Discussion
14625.

What is the function of silica in copper extraction ?

Answer»

Solution :CaO from LIMESTONE `(CaCO_3)` ACTS as FLUX , which combines with `SiO_2` infusible impurity to FORM fusible SLAG.
Discussion
14626.

Which of the vitamin deficiency leads to photosensitive dermatitis (or) pellagra?

Answer»

VITAMIN `B_(5)`
Vitamin `B_6`
Vitamin`B_(3)`
Vitamin D

Answer :C
Discussion
14627.

Which of the following is correct, with reference to protonic acids:

Answer»

`PH_3` is more BASIC than `NH_3`
`PH_3` is LESS basic than `NH_3`
`PH_3` is as basic as `NH_3`
`PH_3` is AMPHOTERIC while `NH_3` is basic

Answer :B
Discussion
14628.

Two elements A and B form compounds having formula AB_2 and AB_4 . When dissolved in20 g of benzene (C_6H_6), 1 g of AB_2lowers the freezing point by 2.3 K whereas 1.0 g of AB_4lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg "mol"^(-1) . Calculate atomic masses of A and B.

Answer»

SOLUTION : Using the formula, `M_2 = (1000K_f w_2)/(w_1 XX DELTA T_f)`
Molar MASS of `AB_2 , M_(AB_2) = (1000xx 5.1 xx 1)/(20 xx 2.3) = 110.87 g "mol"^(-1)`
Molar mass of`AB_4 , M_(AB_4) = (1000 xx 5.1 xx 1)/(20 xx 1.3) = 19615 g "mol"^(-1)`
Atomic mass of A + 2 (Atomic mass of B) = 110.87....(i)
Atomic mass of A + 4 (Atomic mass of B) = 196.15...(ii)
Equation (ii) - Equation (i) gives 2 (Atomic mass of B) = 85.28 orAtomic mass of B = 42.64 u
Substituting in equation (i), we get
Atomic mass of A + 85.28 = 110.87
Atomic mass of A = 25.59 u.
Discussion
14629.

Which one of the following statemnents is false about osmotic pressure?

Answer»

It is the pressure of the hdrostatic COLUMN set up due to osmosis.
It is the pressure applied on the SOLUTION to prevent the entry of the solvent into it through the semi-permeable membrane.
During osmosis, the FLOW of solvent is only from dilute solution to concentrated solution.
Osmotic pressure is INVERSELY proportinal to the temperature of the solution.

Answer :C::D
Discussion
14630.

The total number of possible isomers of the compound [Cu^(II)(NH_(3))_(4)][Pt^(II)Cl_(4)] are :

Answer»

3
5
4
6

Solution :`(Ma_(4))(Nb_(4))`
`{:(,," "M," "N),(,a rightarrow," "4," "0),(,a rightarrow," "3," "1),(,a rightarrow," "1," "3),(,a rightarrow," "0," "4):}`
Discussion
14631.

uncertainty inthe measurement of energy when an electron is excited to statein which it can stay for 1 nano second is

Answer»

`5.25 xx10^(-26)` j
`6.6 xx10^(-34)`j
`1 xx10^(-9)` j
`1.22 xx 10^(-12)` j

Answer :A
Discussion
14632.

What is Acid leaching?

Answer»

Solution :Leaching of sulphide ores such as ZnS,PbS etc., Can be done by TREATING them with hot aqueous sulphuric acid.
`2ZnS(s)+2H_(2)SO_(4)(aq)+O_(2)(g)to2ZnSO_(4)+2S(s)+H_(2)O`
In this PROCESS the insoluble sulphide is converted into soluble and elemental sulphur.
Discussion
14633.

What is correct about the given below

Answer»

The structure II is most acceptable canonical form of aniline
The structure II is acceptable because it is non-aromatic
The structure II is unacceptable because here N atom has 10 VALENCE electrons
The structure II is acceptable because here N atom has 10 valence electrons.

Solution :In structure (II) nitrogen has 10 valence electrons. As N (a second period ELEMENT) cannot EXPAND its octet, it cannot has 10 electrons in its valence shell.
Discussion
14634.

Which substance when boiled which NaOH will evolve NH_3 :

Answer»

Ethylamine
Aniline
Acetamide
Acetoxime

Answer :C
Discussion
14635.

Which one of the following group 16 elements does not exist in -2 oxidation sate ?

Answer»

S
Se
O
Po

Solution :AMONG ELEMENTS of group 16, tendency to show -2 oxidation SATE goes on decreasing as the size of the atom increases down the group. Thus, Po does not show -2 oxidatin STATE.
Discussion
14636.

Trees can decrease sound pollution.

Answer»


ANSWER :A
Discussion
14637.

Which of the following is/are found in the solid state ?

Answer»

Pt
Cu
Au
Na

Answer :D
Discussion
14638.

Which of the following is used to build and repair body tissues

Answer»

CANE sugar
fructose
Protein
Glucose

Solution :Proteins is USED in our body to build and repair body TISSUES.
Discussion
14639.

The species having bond order same as that of (a) CO(b) O_2(c)N_2(d) H_2

Answer»

(a) and(B)
(a) and(C)
(c) and(d)
(a), (b) and(d)

ANSWER :B
Discussion
14640.

The standard molar heat of formation of ethane, CO_(2) and water (l) are respectively - 21.1, - 94.1 and - 68.3 kcal. The standard molar heat of combustion of ethane will be

Answer»

`- 372` kcal
162 kcal
`- 240` kcal
183.5 kcal

Solution :`C_(2)H_(6)+(7)/(2)O_(2)rarr2CO_(2)+3H_(2)O`substitute the values.
Discussion
14641.

Which one of the following is formed when Phenol reacts with benzene diazonium chloride?

Answer»

P- HYDROXY DIAZO PHENOL
P - hydroxy azo benzene
O- hydroxy benzene
O - hydroxy azo benzene

Solution :P - hydroxy azo benzene
Discussion
14642.

Write mechanism of the reaction of HI with methoxy benzene.

Answer»

Solution :`to`Step : 1 Protonation of OH GROUP of PHENOL

Step :2 Attack of NUCLEOPHILE (`I^(-)`)
Discussion
14643.

When hybridisation involving d-orbitals are considered then all the five d-orbitals are not degenerate, rather d_(x^(2)-y^(2)),d_(s^(2)) and d_(xy),d_(zx) form two different sets of orbitals and orbitals of appropriate set is involved in the hybridisation. Molecule having trigonal bipyramidal geometry and sp^(3)d hybridisation, d-orbitals involved is :

Answer»

`d_(xy)`
`d_(YZ)`
`d_(X^(2)-y^(2))`
`d_(Z^(2))`

ANSWER :D
Discussion
14644.

Which of the following haloalkanes is most reactive?

Answer»

1-chloropropane
1-bromopropane
2-chloropropane
2-bromopropane

Solution :The alkyl halides are highly reactive, the order of reactivity is Iodide gt bromide gt CHLORIDE gt (nature of the HALOGEN atom). Tertiary gt secondarygt primary
Thus 2-bromopropane is the GIVEN OPTION
Discussion
14645.

Which compound has electrovalent covalent , co - ordinate as well as hydrogen bond ?

Answer»

`CuSO_(4). 5H_2O`
`ZnCO_(4) . 7H_2O`
`FeSO_(4).7H_2O`
`FeCl_(3).6H_2O`

ANSWER :A
Discussion
14646.

The wavenumber of the first line in the Balmer series of hydrogen is 15200 cm^(-1).What is the wavenumber of the first line in the Balmer series of Be^(3+) ?

Answer»

Solution :`(1/lamda)_(Be^(3+)) = z^2 (1/lamda)_H`
`2.43 xx 10^5 CM^(-1)`
Discussion
14647.

Which one of the folloiwng is used as an electrolyte Lead storage battery?

Answer»

`PbSO_4`
`H_2SO_4`
`CuSO_4`
`HNO_3`

ANSWER :B
Discussion
14648.

The specific conductivity of N//10 KCl solution at 20^(@)C is 0.212 ohm^(-1) cm^(-1) and the resistanceof the cell containing this solutionat 20^(@)C is 55 ohm. The cell constant is :

Answer»

`4.616cm^(-1)`
`1.166cm^(-1)`
`2.173cm^(-1)`
`11.66cm^(-1)`

Solution :RATE of `SN_(2)` reaction `propunderset("Steric over CROWDING in transition STATE")overset(1)_`
Discussion
14649.

Two inflated ballons I and II (thin skin) having volume 600 mL and 1500 mL at 300 K are taken as shown in diagram. If maximum volume of inner and outer balloons are 800 mL and 1800 mL respectively then find the balloon which will burst first on gradual heating.

Answer»

INNER balloon
outer balloon
both simultaneously
unpredictable

Answer :B
Discussion
14650.

Which one of the following gases has the lowest value of the Henry's law constant?

Answer»

`N_(2)`
`He`
`H_(2)`
`CO_(2)`

SOLUTION :HIGHER the solubility, lower is `K_(H).` As `CO_(2)` has MAXIMUM solubility, its `K_(H)` is lowest.
Discussion