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23401.

Write the electronic configuration of (i) AC (Z = 89) (ii) Am (Z = 95) (iii) Lr (Z = 103)

Answer»

Solution :1) `Ac (Z = 89): "[Rn]" 5f^(0)6D^(1) 7s^(2)`
(II) `Am (Z = 95): "[Rn]" 5f^(7)6d^(0) 7s^(2)`
(III) `Lr (Z = 103): "[Rn]" 5f^(144)6d^(1) 7s^(2)`
Discussion
23402.

What are amorphous solids ? Give four important differences between Crystalline and Amorphous solids.

Answer»

Solution : AMORPHOUS solids. These are the solids in which there is no definite ARRANGEMENT of CONSTITUENT PARTICLES. Difference between crystalline and amorphous solids are :
Discussion
23403.

Which of the following molecule has odd e^(-)

Answer»

`ClO_(2)`
`O Cl_(2)`
`O(SiH_(3))_(2)`
`SCl_(2)`

Answer :A
Discussion
23404.

Which of the following is incorrect option ? {:(CuI_(2)+KI to K_(3)[CuI_(4)]),("complex salt"):}

Answer»

oxidation STATE of central ATOM decreases during the formation of complex.
Complex is tetrahedral.
Hybridisation of the complex is `SP^(3)`.
Hybridisation of the complex is `dsp^(2)`.

SOLUTION :`K_(3)[overset(+)CuI_(4)], I^( )C.F.S.E."is very small(since C.A. ALSO has low charge)"impliesC.N.=4 to sp^(3)`
Discussion
23405.

Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment ?

Answer»

`Co^(2+)`
`Cr^(2+)`
`Mn^(2+)`
`Cr^(3+)`

SOLUTION :`Co^(2+) = 3d^(7) , Cr^(2+), Cr^(3+)= 3d^(3) , Mn^(2+)= 3d^(5)`.Thus, `Co^(2+)` and `Cr^(3+)` have the same number of UNPAIRED ELECTRONS viz. 3
Discussion
23406.

Which of the following reactions gives a colloidal substance?

Answer»

coagulates
precipitates
GETS DILUTED
does not change.

Answer :A
Discussion
23407.

Which of the following statements are correct concerning redox properties? (i) A metal M for which E^(@) for the half life reaction M^(n+)+n e^(-)hArrM is very negative will be a good reducing agent. (ii) The oxidizing power of the halogen decrease from chlorine to iodine. (iii) The reducing power of hydrogen halides increases from hydrogen chloride to hydrogen iodide.

Answer»

(i),(ii) and (iii)
(i) and (ii)
(i) only
(ii) and (iii) only

Solution :(i) High NEGATIVE `E^(@)` for `M^(N+)+n e^(-)hArrM` means a high positive VALUE for the reverse reaction, `M hArrM^(n+)+n e^(-)`. This means M is oxidized very easily. HENCE, it is a good reducing AGENT.
(ii) Reduction potentials of halogens are in the order: `Cl_(2) gt Br_(2) gt I_(2)`. thus, `Cl_(2)` is reduced most easily and hence is the best oxidizing agent.
(iii) The size of the halide ions is in the order `Cl^(-) lt Br^(-) lt I^(-)`. greater the size of the halide ion, more easily it can lose electrons and get oxidized. Thus, `I^(-)` ions can be oxidized most easily and hene have the greatest reducing power.
Discussion
23408.

To change the strength of 25 ml of 0.15 M HCl to 0.1 M the quantity of water that is to be added is

Answer»

37.5 ml
12.5 ml
25.0 ml
18.75 ml

Solution :`N_(1)V_(1)=N_(2)V_(2)`
`0.15xx25=0.1V_(1)impliesV_(2)=37.5ml`
WATER to be ADDED`=37.5-25=12.5ml`
Discussion
23409.

What is meant by narrow spectrum antibiotics?

Answer»

Solution :NARROW SPECTRUM ANTIBIOTICS are the antibiotics which are EFFECTIVE mainly against Gram-positive or Gram-negative bacteria. For example, Penicillin is effective only against diseases caused by COCCI and some gram positive bacteria.
Discussion
23410.

Which particleis used to bombard ""_(13)^(28)Al to give ""_(15)^(31)P and neutron ?

Answer»

PROTON
`ALPHA`-PARTICLE
Neutron
Deutron.

Answer :B
Discussion
23411.

Write IUPAC names of the following compounds :

Answer»

Solution :The IUPAC names are :
i) 3 - BROMO - 2 methylbut - 1 - ENE and
II) 4 - Bromopent -2-ene.
Discussion
23412.

Which one of the following is less basic in nature?

Answer»

`La (OH)_(3)`
`GD (OH)_(3)`
`LU (OH)_(3)`
`Ce (OH)_(3)`

Solution :`Lu (OH)_(3)`
Discussion
23413.

Which of the following compounds is optically active ?

Answer»

`CH_3CHOHCOOH`
`CH_3CH_2COOH`
`HOOC CH_2COOH`
`CH_3COCOOH`

ANSWER :A
Discussion
23414.

What is the solvent that we use in the acetylation of aniling using acetic anhydride ?

Answer»


ANSWER :PYRIDINE
Discussion
23415.

The vapour pressure of a liquid varies with temperature as log P=-A/T+I. The plot of

Answer»

LOG P against T will be a STRAIGHT LINE
log P against 1/T will be straight line
log P against I will be a parabola
None of these

Solution :For the reaction log `P=-A/T+I`, PLOT of log P versus 1/T will be a straight line.
Discussion
23416.

What is the significance of Henry's Law constant K_(H) ?

Answer»

SOLUTION :Henry.s law is expressed mathematically as, `p=K_(H)X` (where, p is the PARTIAL pressure of the gas in vapour phase & X is the mole FRACTION of the gas in solution.)
Thus it is significant from above equation that, ..higher the VALUE of Henry.s law constant `K_(H)` at a given pressure, the lower is the solubility of the gas in the liquid...
Discussion
23417.

The splitting of the spectral lines under the influence of magnetic field is called

Answer»

ZEEMAN effect
Compton effect
Photoelectric effect
Difraction.

Answer :A
Discussion
23418.

When a quantity of electricity is passed through CuSO_(4) solution 0.16 g of copper gets deposited if the same quantity of electricity is passed through acidullated water, then the volume of H_(2) gasliberated at S.T.P. will be (Given at wt. of Cu=64)

Answer»

`4.0cm^(3)`
`56cm^(3)`
`604cm^(3)`
`8.0cm^(3)`

SOLUTION :`("Mass of CU deposited")/("Volume of" H_("liberated"))=("Eq. WT of Cu")/("Eq. wt. of H")`
`(0.18)/("Mass of" H_(2) "liberated")=(64//2)/(1)`
or mass of `H_(2)` liberated `=(0.16)/(32)g=5xx10^(-3)g`
`therefore` volume of `H_(2)` liberated at STP
`=(22400)/(2)xx5xx10^(-3)cm^( 3)=56cm ^(3)`
Discussion
23419.

Which of the following alkenes is most stable?

Answer»

`R_2C=CR_2`
RCH = CHR
`RCH = CH_2`
`CH_2 = CH_2`

ANSWER :A
Discussion
23420.

Which equation gives relationship between rate-constant and tempeature ?

Answer»

OSTWALD's equation
Kirchoff's equation
Arrhenius equation
Nernst equation

Answer :C
Discussion
23421.

What are the products formed when 2-butanone is oxidised by conc-HNO_3 ?

Answer»

`CH_3 - CH_2 - CH_2 - COOH`
`HCOOH + CH_3 - CH_2 - COOH`
`CH_3 - undersetoverset(|)(CH_3)(C ) - CH_2COOH`
`CH_3CH_2COOH + CH_3 COOH`

SOLUTION :`CH_3CH_2COOH + CH_3 COOH`
Discussion
23422.

Which of the following compounds is colourless

Answer»

`Cu_(2)(CH_(3)COO)_(4).2H_(2)O`
`Cu_(2)Cl_(2)`
`CuSO_(4).5H_(2)O`
`[Cu(NH_(3))_(4)]SO_(4).4H_(2)O`

Solution :The anhydrous complex of `Cu^(+)` do not involvee d-d transition and are THUS COLOURLESS.
Discussion
23423.

The tendency to form chains of identical atoms is known as ..............

Answer»

SOLUTION :CATENATION
Discussion
23424.

Which of the following biomolecules contain non transition metal ion?

Answer»

vitamin `B_(12)`
chlorophyll
haemoglobin
insulin

Solution :BiomoleculeMetal ION
Vitamin `B_(12)`Co (TRANSITION METAL)
ChlorophyllMg (non-transition metal ion)
HaemoglobinFe (transition metal)
INSULINS (non-metal)
Discussion
23425.

Which of the given statements is INCORRECT about glycogen ?

Answer»

It is a straight CHAIN polymer similar to amylose
It is present in animal cells
It is present in some YEAST and fungi
Only`alpha-`linkages are present in the molecule

Solution :GLYCOGEN is NOT similar in structure to amylose which is a straight chain polymer. It shows similarity with amylopectin in its structure with higher number of branches. Glycogen is generally found in animal cells and ALSO in some yeast and fungi. It only have `alpha` linkages between the monomeric UNITS.
Discussion
23426.

Which of the following is not a condensation polymer ?

Answer»

POLYSTYRENE
Glyptal
Terelene
Nylon - 66

Answer :A
Discussion
23427.

The solution of H_(2)SO_(4) of molarities x and y are mixed in the ratio of V_(1) mL : V_(2) mL of form a solution of molarity M_(1). If theyare mixed in the ratio of V_(2)mL : V_(1)mL , they form a solution of molarity M_(2). Given (V_(1))/(V_(2))gt 1 and (M_(1))/(M_(2))=(5)/(4), calculate the ratio x:y.

Answer»

Solution :`{:(,M_(1)'V_(1)'+M_(2)'V_(2)'=M_(3)'(V_(1)'V_(2)')),("In 1st case,",x xxV_(1)+y xx V_(2)=M_(1)(V_(1)+V_(2))"...(i)"),("In 2nd case, ", x xx V_(2)+y xxV_(1)=M_(2)(V_(1)+V_(2))"...(ii)"):}`
DIVIDING eqn. (i) eqn. (ii), weget
`(xV_(1)+yV_(2))/(xV_(2)+yV_(1))=(M_(1))/(M_(2))=(5)/(4)"GIVEN)"`
`"or"4(xV_(1)+yV_(2))=5(xV_(2)+yV_(1))`
`"or"4xV_(1)+4yV_(2)=5xV_(2)+5yV_(1)`
`"or"(4x-5y)V_(1)=(5x-4y)V_(2)`
`"or"(V_(1))/(V_(2))=(5x-4y)/(4x-5y)=(x)/(y)"(Given)"`
`"or"((5x)/(y)-4)/((4x)/(y)-5)=(x)/(y)"(Dividing numerator and denominator by y)"`
`"or"(5x)/(y)-4=(4x^(2))/(y^(2))-4(x)/(y)"or"(4x^(2))/(y^(2))-10(x)/(y)+4=0`
`"Putting"(x)/(y)=z,4z^(2)-10z+4=0`
`therefore""z=(-b pmsqrt(b^(2)-4ac))/(2a)=(10pmsqrt(100-64))/(8)=(10pm6)/(8)=(16)/(8)"or"(4)/(8)," i.e., 2 or "(1)/(2)`
`"As"(x)/(y) gt 1," HENCE "(x)/(y)=2," i.e., " x:y = 2:1`
Discussion
23428.

Write Haworth structure for maltose.

Answer»

SOLUTION :MALTOSE
Discussion
23429.

When ethyl methyl ether is reacted with cold conc. HI gives ethanol and methyl iodine. The reaction proceeding through

Answer»

`SN^1`
`SN^2`
`E^1`
`E^2`

ANSWER :B
Discussion
23430.

The two strands of DNA are not identical but are complementary. Explain.

Answer»

Solution :The DNA has a double helix STRUCTURE. The two strands of DNA are held by the HYDROGEN BONDS between the bases on two strands. Thymine(T) pairs with ADENINE(A) through two hydrogen bonds and cytosine (C) pairs with guanine (G) through three hydrogen bonds. Thus, two strands are complementary to each other.
Discussion
23431.

Which one is correct for first order reaction.

Answer»

`t_(75%)/t_(50%)`=1.5
`t_(75%)/t_(50%)`=3
`t_(99.9%)/t_(50%)`=10
`t_(87.5%)/t_(50%)`=3

ANSWER :C::D
Discussion
23432.

What is plasticizer ?

Answer»

Solution :Organic compounds which when ADDED to plastics MAKE than SOFT and workable are called plasticizers. For example , di-n-octylphthalate, cresyl triphosphate, ETC.
Discussion
23433.

Which of the following is a 3^@ - amine ?

Answer»

Teriethylamine
t-Butylamine
N-methylamine
Ethylamine

Answer :A
Discussion
23434.

Which of the following is a appropriate set of reactants for the preparation of ethoxy benzene?

Answer»


ANSWER :A
Discussion
23435.

Which of the following ion is easily reduced

Answer»

`CE^(3+)`
` Ce ^(4+)`
`Nd ^(2+)`
`Yb^(2+)`

SOLUTION :We know that, `Ce ^(4+)` act as oxidising agetn. Hence it easily reduced.
Discussion
23436.

Which of the following acts as a nucelphilic?

Answer»

`CI^(o-)`
`OVERSET(o-)(O)H`
`SO_(2)`
None

Solution :NA
Discussion
23437.

Which of the following pairs is not correctly matched.

Answer»

ALLOTROPIC form of sulphur which is more stable at room temperature - RHOMBIC
The hydride of group 16 which is liquid at room temperature - Water
The gas formed in the upper layers of atmosphere by action of UV radiations - Nitrogen
The catalyst USED in the manufacture of `H_(2)SO_(4)` by contact process - Vanadium pentoxide

Solution :The gas formed in the upper layers of atmosphere by action of UV radiations is ozone.
Discussion
23438.

Which of the following graph represents 3s orbital

Answer»




Solution :For 3s orbital
No. of RADIAL nodes = 2 and height of MAXIMA INCREASES
Discussion
23439.

Write the structures of the following compounds whose IUPAC names are given as under: (a) But-2-ene (b) 1,2,3-propantriol (c) Ethanoyl chloride (d) 2,3-pentadione (e) Octa-3,5-diene (f) 4-hydroxy-3-pentenoic acid (G) 2,3-dimethylbutan-2-ol (h) 2,2-dimethylpentanal (i) 2,7-dimethylocata-2,4,6-trience.

Answer»


ANSWER :(a) `CH_(3)-CH=CH-CH_(3)`
(b) `CH_(2)OH-CHOH-CH_(2)OH`
(C) `CH_(3)COCl`
(d) `CH_(3)COCOCH_(2)CH_(3)`
(e) `CH_(3)CH_(2)CH=CH-CH=CH-CH_(2)-CH_(3)`
(f) `HOOC-CH_(2)-CH=C(OH)CH_(3)`
(g) `CH_(3)-underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)OVERSET(OH)overset(|)(C)-CH_(3)`
(h) `CH_(3)-CH_(2)-CH_(2)-C(CH_(3))_(2)`
`(##GRB_ORG_CHM_P1_C03_E02_007_A01##)`
(i) `(CH_(3))_(2)-C=CH-CH=CH-CH=C(CH_(3))_(2)`
(i) `(CH_(3))_(2)-C=CH-CH=CH-CH=C(CH_(3))_(2)`
Discussion
23440.

Which of the following hydroxide is more ionic and more basic in nature ?

Answer»

`CE (OH)_(3)`
`LU (OH)_(3)`
`Dy (OH)_(3)`
`TM(OH)_(3)`

Answer :A
Discussion
23441.

Which of the following statements is not true for Mohr.s salt?

Answer»

It DECOLOURISES `KMnO_4` solution
It is a double salt
Oxidation state of iron is `+3`
It is a PRIMARY standard

Answer :C
Discussion
23442.

What are the uses of a lead accumulator ?

Answer»

Solution :A lead ACCUMULATOR is used (1) In automobiles for the supplyof electric current (2) in the LABORATORIES as a D.C. supply (3) in telephone and TELEGRAPH systems (4) also in invertors.
Discussion
23443.

Which xylene is most easily sulphonated

Answer»

<P>Ortho
Para
Meta
All at the same rate

SOLUTION :
m-xylene is most EASILY sulphonated because o and p both POSITIONS are free with respect to methyl group
Discussion
23444.

What is the difference between bathing soap and washing soap ?

Answer»

Solution :Bathing SOAPS are potassium SALTS of long CHAIN FATTY acids while washing soaps are SODIUM salts of long chain fatty acids.
Discussion
23445.

Which of the following complex is optically inactive

Answer»

`[RhCl(CO)(PPh_(3))(NH_(3))]`
`[Fe(en)_(2)Cl_(2)]`
`[Fe(en)_(2)Cl_(2)]`
`[PD(en)_(2)Cl_(2)]`

SOLUTION :`[RhCl(CO)(PPh_(3))(NH_(3))]` is inactive as it is square planer COMPLEX.
Discussion
23446.

Which one of the enzyme is produced in liver to detoxify the alcohol?

Answer»

DIASTASE
Zymase
Invertase
DEHYDROGENASE ALCOHOL

SOLUTION :Dehydrogenase alcohol
Discussion
23447.

Which of the following oxocation is not possible

Answer»

`PuO_(2)^(+)`
`CeO_(2)^(+)`
`UO_(2)^(2+)`
`NpO_(2)^(2+)`

Solution :Oxioin of lanthanides are not POSSIBLE. CE is lanthanide ELEMENT.
Discussion
23448.

What type of battery is dry cell ? Write overall reaction occurring in dry cell.

Answer»

SOLUTION :PRIMARY CELL.
Discussion
23449.

Whichof the followinghas highestpkbvalue .

Answer»




ANSWER :A
Discussion
23450.

Which of the following is a lanthanide ?

Answer»

Ta
Rh
Th
Lu

Answer :D
Discussion