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23701.

Which of the following shape are not possible for possible value of n in XeF_(n) molecule ?

Answer»

LINEAR
Square planar
Trigonal planar
Capped octahedral

Solution :In `XeF_(n)`, possible value of n is 2,4,6,8, then COMPOUND should be `XeF_(2)` (linear), `XeF_(4)` (square planar), `XeF_(6)` (capped octahedral). So in this CASE trigonal planar MOLECULE does not possible.
Discussion
23702.

Which one of the following is called pseudo firs order reaction ?

Answer»

DECOMPOSITION of acetaldehyde
ACID hydrolysis of an ester
Isomerisation of cycloprapane to propne
Decomposition of hydrogen peroxide

ANSWER :B
Discussion
23703.

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 acidulated water, then the volume of H_(2) liberated at STP will be [given : at.wt. of Cu = 64].

Answer»

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

Solution :`("wt. of Cu deposited")/("wt. of " H_(2) " produced")=("EQ. wt. of Cu")/("eq. wt. of H")=(64//2)/(1)`
or,`(0.16)/("wt. of " H_(2))=(32)/(1)`
or, wt. of `H_(2) =(0.16)/(32)=5XX10^(-3)g`.
`therefore`VOLUME of `H_(2)`liberated at STP
`=(22400)/(2)xx5xx10^(-3)` cc = 56 cc.
Discussion
23704.

Which is most acidic in nature?

Answer»

`Na_2O`
`NO_2`
`Al_2O_3`
CAO

Solution :`NO_2` is ACIDIC , `Al_2O_3` is AMPHOTERIC , `Na_2O` and CaO BASIC
Discussion
23705.

Two aliphatic compounds will not be considered isomers if they are-

Answer»

ALDEHYDE and ketone
ether and alcohol
ether and aldehyde
carboxylic ACID and ester

Answer :C
Discussion
23706.

The salt that does not hydrolyse:

Answer»

`SnCl_2`
`FeCl_3`
`SnCl_4`
`CaCl_2`

ANSWER :D
Discussion
23707.

Which of the following ionic/molecular species does not disproportionate in water at room temperature?

Answer»

`NO_(2)`
`CU^(+)`
`MnO_(4)^(2-)`
`Ca(OC L)Cl`

Answer :D
Discussion
23708.

Which of the following dissolves in H_(2)SO_(4) to give oleum?

Answer»

`H_(2)S`
`S_(2)O`
`SO_(2)`
`SO_(3).`

Solution :`H_(2)SO_(4)+SO_(3)rarr UNDERSET("OLEUM")(H_(2)S_(2)O_(7))`
Discussion
23709.

What are lanthanoids ? (Or rare earths)

Answer»

SOLUTION :The ELEMENTS from lanthanum (Z = 57) to lutetium (Z = 61) are called lanthanoids. In these elements the added electrons enters into 4f-orbitals.
Discussion
23710.

When chlorine is passed through KI and starch solution

Answer»

A YELLOW colour is obtained
`l_2` is liberated
`Br_2` is liberated
`I_2` is liberated and solution BECOMES blue

Solution :`2KI + Cl_2 to 2KCL + I_2`
Discussion
23711.

When a Radioactive substance is kept in a vessel, थे atmosphere around it is rich with

Answer»

He
Ne
Ar
Xe

Answer :A
Discussion
23712.

Which of the following carbohydrate is synthesised by nature on the largest scale :

Answer»

Glucose
Fructose
Lactase
Cellulose

Answer :D
Discussion
23713.

Which among the following is mismatched regarding the shape ?

Answer»

`XeF_(4)`- square planar
`XeOF_(4)`- square PYRAMIDAL
`XeF_(6)`- DISTORTED octahedral
`XeO_(3)` - BENT T shape

Answer :A::B::C
Discussion
23714.

When KBr is dissolved in water. K^(+) ions are

Answer»

hydrated
hydrolysed
reduced
oxidised

Solution :When KBr is dissolved in water , `K^(+)` ions are hydrated DUE to ionic NATURE, KBr is soluble in water.The solubility is due to the fact that `K^(+)` gets hydrated by `H_(2)O` molecule.The hydration energy COMPENSATES the LATTICE energyand hence solid breaks and dissolves.Hydration is an EXOTHERMIC process.The energy of hydration of ions is known as hydration energy.
Discussion
23715.

Activated charcoal is used to remove colouring matter from pure substance, it works by

Answer»

BLEACHING
Reduction
Oxidation
Adsorption

Answer :D
Discussion
23716.

Which one of the following is a covalent crystal ?

Answer»

GLASS
DIAMOND
ANTHRACENE
Glucose

Solution :Diamond
Discussion
23717.

Which one is hard base ?

Answer»

`AG^+`
`CR^(3+)
`I_2`
`F^-`

ANSWER :D
Discussion
23718.

Which of thefollowingstatement (s) is /ar flase forelelctrolytic cell?

Answer»

Externalsource of votage is appliedto carry coiutchemical reaction
thesecellsare mainlyusedin laboratory and chemicalindustry
thesecell consistof twocopperstripsdipped in ANAQUEOUSSOLUTIONOF `CuSO_(4)`
none of THEABOVE

SOLUTION :Inelectrolytic cell external source of voltage is uded to bring chemical reaction it hasmain USE in laboratory and chemical industryone of the simplest electrolytic cellconsists of twocopperstripsdippingin aqueoussolutionof `CuSo_(4)`
Discussion
23719.

Zero order reaction means that the rate of a reaction is independent of the concentration of reactants. Write the integral rate expression for the zero order reaction,RtoP

Answer»

SOLUTION :k=`[[R_0]-[R]]/t`where`[R_0]`is the INITIAL CONCENTRATION of reactant,[R] is the concentration at time t and k is the rate constant.
Discussion
23720.

Zero order reaction means that the rate of a reaction is independent of the concentration of reactants. Write an example for a zero order reaction.

Answer»

Solution :THERMAL DECOMPOSITION of HI on gold SURFACE
Discussion
23721.

Two reactions proceed at 25^(@)C at the same rate. The temperature coefficient of the rate of first reaction is 2 and that of second reaction is 2.5. The ratio of rates of these reactions at 95^(@)C is

Answer»

5.6
9.85
4.768
70

Solution :`{:(T,R_(1),R_(2)),(25^(@)C,R,R),(35^(@)C,2R,2.5R),(45^(@)C,2^(2)R,(2.5)^(2)R),(":",":",":"),(95^(@)C,2^(7)R,(2.5)^(7)R):}`
`THEREFORE(R_2)/(R_1)=((2.5)^7)/(2^7)=4.768`
Discussion
23722.

[Ti(H_(2)O)_(6)]^(+3) gives violet coloured aqueous solution but [Mg(H_(2)O)_(6)]^(+2) solution is colourless, why? (b) At 10^(@) C, the osmotic pressure of urea is 500 mm. The solution is diluted and the temperature is raised to 25^(@) C, when the osmotic pressure is found to be 105.3 mm. Determine the extent of dilution.

Answer»

Solution :(a) In `[T(H_(2)O)_(6)]^(+3)`, the `d^(1)` electrons occupies `t_(2g)` orbital in octahedral field. On irradiation with light. The `I_(2g)` electron is promoted to `e_(g)` orbital and the resulting absorption band gives violet colour.
In case of `[Mg(H_(2)O)_(6)]^(+3)`, the electrons configuration of `Mg^(+2)` is `1s^(2)2s^(2)2p^(6)` which does not permit any electronic TRANSITION `(2p to 3s)` as the energy gap is very LARGE or there does not d-d transition of electrons. Hence, it gives colourles solution.
(b) For original solution,
`500/700 xx V_(1) = x/m xx S xx 283`..........(1)
After dilution,
`105.3/760 xx V_(2) = x/m xx S xx 298` ..............(2)
Dividing EQUATION (2) by (1)
`therefore V_(2)/V_(1) =5`
`rArr` The solution is diluted to the extent that `V_(2)` is five times the original VOLUME (V).
Discussion
23723.

Which one is not prepared from tartaric acid :

Answer»

TARTAR emetic
Fenton's reagent
Fehling's SOLUTION
ROCHELLE salt

Answer :B
Discussion
23724.

Which of the following is an antipyretic with anaglesic quality?

Answer»

CODEIN
Morphine
Heroin
paracetamol

Answer :D
Discussion
23725.

Which of the following undergoes dehydration most readily:

Answer»

1-phenyl-1-butanol
1phenyl-2-butanol
2-phenyl-2-butanol
2-phenyl-1-butanol

Answer :C
Discussion
23726.

Which of the followng is insoluble in alcohol :

Answer»

RESINS and varnishes
Soaps and varnishes
Rubber and plastics
Dyes and durgs

Answer :C
Discussion
23727.

Which do not from amalgam with Hg ?

Answer»

Pt
Fe
Both (a) and (B)
None

Answer :C
Discussion
23728.

Which of the following processes does not involve oxidation of iron ?

Answer»

FORMATION of `FE(CO)_2` from Fe
Liberation of `H_2` from STEAM by IRON at high temperature
Rusting of iron sheets
Decolourisation of blue `CuSO_4` solution by iron

Answer :A
Discussion
23729.

Which is the best decription of behaviour of bromine in the reaction given below ? H_(2)O + Br_(2) HBR + HOBr

Answer»

Only oxidised
Only reduced
Both oxidised and reduced
Only PROTON accepted

Solution :In the reaction.
`H_(2)O+overset(0)(B)r_(2) rarr HO overset(+1)(Br)+Hoverset(-1)(Br)`
The oxidation number of bromine INCREASES from 0 to +1 and decreases from 0 to -1, dut to this reason bromine is both oxidised as WELL as reduced in the above reaction.
Discussion
23730.

Which of the following reactions with H_(2)S does not produce metallic sulphide

Answer»

`ZnCl_(2)`
`CdCl_(2)`
`COCl_(2)`
`CuCl_(2)`

SOLUTION :In `COCl_(2)` metal is not produce METALLIC SULPHIDE in reaction.
Discussion
23731.

Which of the following compounds when dissolved in water, gives a solution with pH less than seven?

Answer»

`CH_3COCH_3`
`C_6H_5OH`
`C_6H_5NH_2`
`C_2H_5OH`

ANSWER :B
Discussion
23732.

Which of the following reaction representes incorrect product

Answer»




`{:(H-C-COOH),("||"),(H-C-COOH):} OVERSET(DELTA)toCH_(2)=CH-COOH+CO_(2)`

SOLUTION :
Discussion
23733.

Whichof thefollowingisomerismis exhibitedin nitrogen ?

Answer»

GEOMETRICAL
OPTICAL
TAUTOMERISM
chainisom

Answer :C
Discussion
23734.

When a brown compounds of manganese (A) is treated with HCl, it gives a gas (B) . The gas taken in excess, reacts with NH_(3) to give an explosive compound (C ). Identify compounds A,B and C.

Answer»

Solution :`underset((A))(MnO_(2))+4HClrarrMnCl_(2)+underset((B))(Cl_(2))+2H_(2)O`
`underset((B))(NH_(3))+underset("excess")(3Cl_(2))rarrunderset("(C)")(NCl_(3))+3HCL`
Discussion
23735.

The total number of molecules of hydrogen and oxygen that may be obtainedfrom a given amount of H_2O is 6000. Find the amount of H_2O

Answer»

SOLUTION :`1.195 XX 10^(-19) G`
Discussion
23736.

Which of the following compounds is most acidic?

Answer»

`Cl-CH_(2)CH_(2)-OH`


ANSWER :C
Discussion
23737.

Which Vitamin deficiency casuses the disease 'Rickets'?

Answer»

SOLUTION : VITAMIN .D. .
Discussion
23738.

Which of the following compound does not give reaction with Hinsberg's reagent ?

Answer»

TRIETHYL amine
Tertiary BUTYL amine
N-methyl aniline
1-methyl cyclohexylamine

Answer :A
Discussion
23739.

Which of the following product is not correct : Carbonyl compound + Reagent to Product

Answer»


ANSWER :D
Discussion
23740.

Which of the following compound gives a positive iodoform test:

Answer»

Pentanal
1-phenyl ethanol
2-phenyl ethanol
3-pentanol

Answer :B
Discussion
23741.

What type of ores are concentrated by electromagnetic separation?

Answer»

SOLUTION :Electromagnetic SEPARATION is employed when either the ore or its impurities are MAGNETIC in nature.
Discussion
23742.

Which of the following compounds is colourless and odourless?

Answer»

`CH_(3)`NC
`CHl_(3)`
`CHCl_(3)`
`CF_(2)Cl_(2)`

ANSWER :D
Discussion
23743.

Which is chemically most active non-metal

Answer»

Fluroine
Nitrogen
Oxygen
Sulphur

Answer :A
Discussion
23744.

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

Answer»

FUSED SALT electrolysis
Self REDUCTION
Aqueous SOLUTION electrolysis
Thermite reduction

ANSWER :A
Discussion
23745.

What is the order of bond enthalpies of halogens? Why is it not opposite to that of bond lengths?

Answer»

Solution :Bond lengths ofhalogens are in the ORDER :
`F_(2)ltCl_(2)ltBr_(2)ltI_(2)`.
Bond energies are expected in the order :
`F_(2)ltCl_(2)ltBr_(2)ltCl_(2)`.
But the experimental bond enthalpies are :
`Cl_(2)gtBr_(2)gtF_(2)gtI_(2)`.
Bond enthalpy of `F_(2)` is very less , because lone pair lone pair repulsions are APPRECIABLE in `F_(2)` as the bond LENGTH is small in `F_(2)`.
It was also thought , though not APPROPRIATE , that F-F bond is weak as multiple bond is not possible with no d-orbitals in the valence shell of fluorine .
Discussion
23746.

What do you mean by ppm mode of concentration ?

Answer»

SOLUTION :PPM = Number of parts of the component / Total number of parts of all components of the solution ` XX 10^6`
Discussion
23747.

Which out of the following is a macromolecular and multimolecular colloid ? Starch sol, sulfur sol.

Answer»

SOLUTION :Macromolecular: Starch: MULTIMOLECULAR : SULFUR SOL.
Discussion
23748.

What type of hybridization is involved in PCI_5 ?

Answer»

SOLUTION :`sp^3 d.`
Discussion
23749.

Upon irradiating californium with neutrons, a scientistdiscovered a new nuclide having mass number of 250 and a half-life of 30 min. After 90 min. of irradiation, the observed radioactivity due to nuclied was 100 dis/min. How many atoms of the nucliede were prepared intially?

Answer»

`2.4xx10^(4)`
`3.46xx10^(4)`
1900
800

Answer :B
Discussion
23750.

Using bond enthalpy data, calculate enthalpy of formation of isoprene. Neglect resonance in isoprene. {:(5 C(s)+4H_(2)(g) rarr H_(2)C=C-C=CH_(2)(g)),("|""|"),(""CH_(3)H):} {:("Given :",C-H=98.9" k Cal",,,H-H=104" k Cal",,),(,C-C=83" k Cal",,,C=C=147" k Cal",&),(,C(s) rarr C(g)=171" k Cal".,,,):}

Answer»


SOLUTION :`DeltaH=855+416-1250.4=20.6`
Discussion