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12601.

Why artificial rain can be caused by throwing common salt on the clouds?

Answer»

SOLUTION :Clouds are COLLOIDAL dispersion of water particles in air. The colloidal water particles CARRY charge. On throwing COMMON salt on the clouds, coagulation of water particles TAKES place as common salt is an electrolyte.
Discussion
12602.

The wavelength of radiation having frequency 1000 Hz is

Answer»

`3XX10^(13)CM`
`3.0xx10^(7)cm`
`3000Å`
`300nm`

Solution :`lamda=c/v=(3.0xx10^(10)cm^(-1))/(1000S^(-1))=3.0xx10^(7)`
Discussion
12603.

Which chemical contains chlorine

Answer»

FISCHER salt
Epsom salt
Fermy.s salt
Spirit of salt

Answer :D
Discussion
12604.

Which of the following reactions form benzylamine?

Answer»




ANSWER :A::D
Discussion
12605.

Which of the following exists as a dimer ?

Answer»

ALUMINIUM chloride
Aluminium bromide
Aluminium iodide
Magnesium chloride

Answer :A
Discussion
12606.

The relation between DeltaE and DeltaH is

Answer»

`DELTAH = DELTAE - PDELTAV`
`DeltaH=DeltaE+PDeltaV`
`DeltaE=DeltaV+DeltaH`
`DeltaE=DeltaH+PDeltaV`

SOLUTION :`DeltaH=DeltaE+PDeltaV`.
Discussion
12607.

The solubility product, K_f of a sparingly soluble salt MX at 25^oC is2.5 xx 10^-9. The solubility of the salt in mol litre^-1 at this temperature is :

Answer»

`1.0xx10^(-14)`
`5.0xx10^(-8)`
`1.25xx10^(-9)`
`5.0xx10^(-5)`

ANSWER :D
Discussion
12608.

Three isometic compounds M,N and P (C_(5)H_(10)O) give the following tests (i) M and P react with sodium bisulfite to form an adductJ (ii) N Comsumes I mol of bromine and also gives turbidity with conc. HCl/anhydrous ZnCl_(2) after prolong heating (iii) M reacts with excess of iodine in alkaline solution to give yellow crystalline compound with a characterstics smell. (iv) p-Rosaniline treated with sulphur dioxide develops pink colour on shaking with P the structure of M,N and P, respectively are

Answer»




ANSWER :D
Discussion
12609.

What is dialysis ?

Answer»

Solution :The PROCESS of separation of crystalloids from COLLOID is CALLED dialysis.
Discussion
12610.

When aqueous sodium hydroxide is added to an aqueous solution of chromium (III) ions, a green blue precipitate is first formed which re-dissolves to give a greeen solution. This green colour is due to :

Answer»

`[CR(H_(2)O)_(6)]^(3+)`
`CrO_(4)^(2-)`
`[Cr(OH)_(4)]^(-)`
`[Cr(OH)_(3)(H_(2)O)_(3)]`

ANSWER :C
Discussion
12611.

Which of the following ether will give always S_N2 mechanism in acidie as well as basic conditions ?

Answer»


`C_6H_5-CH_2-O-CH_3`

All of these

Solution :PRIMARY ALKYL GROUPS UNDERGOES S.. I REACTION
Discussion
12612.

The values of observed and calculated molecular weights of calcium nitrate are respectively 65.6 and 164 . The degree of dissociation of calcium nitrate will be:

Answer»

`25%`
`50%`
`75%`
`60%`

Answer :C
Discussion
12613.

Write the IUPAC name of K_2[Ni(CN)_4].

Answer»

POTASSIUM tetracyanonickelate(II)
potassium tetracyanonickelate(III)
potassium tetracyanonickelate(0)
NONE of these

Answer :A
Discussion
12614.

What is meant by chirality of a compound,. Give one example.

Answer»

SOLUTION :
A COMPOUND is said to be chiral if it EXISTS in two stereosiomeric FORMS which are non-superimposable mirror images of each other. This property of non-superimposability is called CHIRALITY and the two compounds which are non-superimpossible mirror images of each other are called enantiomers.
Discussion
12615.

Which of the following contains) aluminium

Answer»

Feldspar
Epson
Fluorspar
Flourite

SOLUTION :(a) Feldspar `KAlSi_(3)O_(8)` , (b) Epson salt `-MgSO_(4).7H_(2)O`, (c) Fluorspur `-CaF_(2)` (d) FLUORITE `-CaF_(2)`
Discussion
12616.

Which of the following is not a plasticizer ?

Answer»

PHENOL
Tricresyl PHOSPHATE
OLEIC ACID
All of these

Solution :Phenol
Discussion
12617.

What is the use of platnum foil in the hydrogen electrode?

Answer»

SOLUTION :It is USED for the INFLOW and OUTFLOW of ELECTRONS.
Discussion
12618.

Which of the following salt becomes plaster of paris on being appropriately hydrated

Answer»

`ZnCO_(3)`
`CaSO_(4)`
`MgSO_(4)`
`CaCO_(3)`

Solution :`UNDERSET("Gypsum") (CasO_(4).2H_(2)O)overset(120^(@)C)to underset("Plaster of paris")(CaSO_(4).1/2 H_(2)O) + 1.1/2 H_(2)O`
Discussion
12619.

What is the [OH^(-)] in the final solution prepared by mixing 20 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)_(2) ?

Answer»

0.40 M
0.0050 M
0.12 M
0.10 M

ANSWER :D
Discussion
12620.

Which of the following is absent in DNA ?

Answer»

URACIL
GUANINE
Phosphoric Acid
RIBOSE SUGAR

Solution :Uracil
Discussion
12621.

Which one of the following orders is not proper?

Answer»

`F_2 gt Cl_2 gt Br_2 gt I_2` : Electronegativity
`F_2gt Cl_2 gt Br_2 gt I_2` : BOND DISSOCIATION energy
`F_2 gt Cl_2 gt Br_2 gt I_2 ` : Oxidising power
`HI gt HBr gt HCl gt HF` : Acidic property in WATER

Solution :Bond dissociation energy of `F_2` is less than that of `Cl_2`
Discussion
12622.

Which one of the following is used as a preservative for the preparation or pickles and preservation of vegetables?

Answer»

SODIUM acetate
ACETIC ACID
sodium carbonate
salicylic acid

SOLUTION :acetic acid
Discussion
12623.

The standard compound for determination of configuration in the 'sugar chemistry' is

Answer»

Glycoaldehyde
Glyceraldehyde
Glucose
Fructose

ANSWER :B
Discussion
12624.

Which of the following represents surfactant molecule?

Answer»

`C_17H_36`
`C_17H25COO^-Na^+`
`H_2O`
NONE of these

Answer :B
Discussion
12625.

The vapour pressure of ethyl alcohol at 298K is 40mm of Hg. Its mole fraction in a solution with methyl alcohol is 0.80. what is its vapoure pressure in solution. If the mixture obeys Raoult's law.

Answer»

8 mm HG
32 mm Hg
48 mm Hg
80 mm Hg

Solution :Vapour PRESSURE of ETHYL ALCOHOL
`=40xx0.80`
`=32` mm Hg
Discussion
12626.

whichone of the followingis a steroid ?

Answer»

INSULIN
EPINEPHRINE
INULIN
Estrogen

Answer :D
Discussion
12627.

Which method is not used for concentration of ores ?

Answer»

Magnetic seperation 
Froth FLOATATION 
SMELTING 
Hydraulic WASHING of COMPLEX 

Answer :C
Discussion
12628.

What is mean by chemical adsorption ?

Answer»

Solution :If the adsorbate is HELD on the surface of the adsorpbent as a result of CHEMICAL REACTION forming surface compounds, it is called chemical adsorption.
Discussion
12629.

Write Nernst equation for the electrode reaction : M^(n+) + "ne"^(-) to M (s)

Answer»

SOLUTION :`E_(M^(n+)//M) = E_(M^(n+)//M)^(@) + (2.303 RT)/(NF) log [M^(n+)]`.
Discussion
12630.

Which of the following amine does not react with Hinsberg's reagent ?

Answer»

`CH_(3)CH_(2)NH_(2)`
`(CH_(3)CH_(2))_(2)NH`
`(CH_(3)CH_(2))_(3)N`
All of these

Solution :N//A
Discussion
12631.

The standard enthalpy of formation of NH_(3) is - 46.0 kJ mol^(-1). If the enthalpy of formation of H_(2) from its atoms is - 436 kJ mol^(-1) and that of N_(2) is - 712 kJ mol^(-1), the average bond enthalpy of N - H bond is NH_(3) is

Answer»

`+ 1056 kJ mol^(-1)`
`- 1102 kJ mol^(-1)`
`- 964 kJ mol^(-1)`
`+ 352 kJ mol^(-1)`

Solution :The required equation is
(i) `NH_(3) (g) RARR N (g) + 3H (g)`
The given equation are
(ii) `(1)/(2)N_(2) (g) + (3)/(2) H_(2) (g) rarr NH_(3) (g) Delta H = - 46 kJ`
(iii) `2H (g) rarr H_(2) (g) Delta H = - 436 kJ`
(iv) `2N (g) rarr N_(2) (g) Delta H = - 712 kJ`
Multiplying eq. (iv) by `(1)/(2)` and eq. (iii) by `(3)/(2)` and ADD
(v) `N (g) + 3H (g) rarr (1)/(2) N_(2) (g) + 3H_(2) (g) Delta H = - 1010 kJ`
Add eq. (iv) and (ii)
`N (g) + 3H (g) rarr NH_(3) (g) Delta H = - 1056 kJ`
or `N (g) + 3H (g) rarr NH_(3) (g) Delta H = 1056 kJ`
This gives enthalpy of dissociation of 3 N - H bonds
:. Average bond enthalpy of N - H = `(1056)/(3)`
= 352 kJ
Discussion
12632.

Which of the following is considered to be an anticancer species ?

Answer»




ANSWER :B
Discussion
12633.

Vapour pressure of waterat 20^(@)C is 17.5 mm Hg. Calculate the vapour pressure of the soution at 20^(@)C and 15 g of glucose (molar mass= 180 g mol^(-1)) is dissolved in 150 g of water.

Answer»


Solution :ACCORDING to Raoult's Law
`(P_(A)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`(17.5 mm-P_(S))/P_(S)=((15g))/((180" G mol"^(-1)))xx((18" g mol"^(-1)))/((150g))=0.01`
`(17.5mm)/P_(S)-1=0.01 or ((17.5mm))/P_(S)=1.01`
`P_(S)=((17.5"pm"))/1.01=17.326mm.`
Discussion
12634.

Write the balancedequitionfor the following ''Potassiumpermanganateis reactedwithwarm solutionof oxalic acidin the oresence of sulphuric acid''

Answer»

Solution :Ionic EQUATION
`2MnO_(4)^(Theta) + 5C_(2)O_(4)^(2-) + 16H^(Theta) rarr 2MN^(2+) + 8H_(2)O + 10CO_(2)`
Discussion
12635.

Whichof thefollowingreactionswillnotgivepropane ?

Answer»

`CH_(3)CH_(2)CH_(2)Clunderset(H_(2)O)overset(MG//"ether")to`
`CH_(3) -underset(OH)underset(|)(CH) -CH_(3)overset(p//HI)to`
`CH_(3)-HC=CH_(2)underset(CH_(3)COOH)overset(B_(2)H_(6))to`
`CH_(3)COClunderset(H_(2)O)overset(CH_(3)MGX)to`

Answer :D
Discussion
12636.

Which of the following is aromatic hydrocarbon ?

Answer»




ANSWER :3
Discussion
12637.

Two equilibria are simultaneously existing in a vessel at 25^(@)C NO(g)+NO_(2)(g)hArrN_(2)O_(3)(g)K_(P_(1)) 2NO_(2)(g) hArrN_(2)O_(4)(g)K_(P_(2))=8 atm^(-1) Initially only NO(g) and NO_(2)(g) are present in 3:5 mole ratio. The total pressure at equilibrium is 5.5 atm and the partial pressure of NO_(2) at equilibrium is 0.5 atm The incorrect statement(s) regarding the above equilibria is/are

Answer»

`K_(P_(1))` for the equilibrium is `0.4 ATM^(-1)`
PARTIAL pressure of `N_(2)O_(4)` at equilibrium is `1.6 atm`
Partial pressure of `N_(2)O_(3)` at equilibrium is `2atm`
Partial pressure of `NO` at equilibrium is `2.5 atm`

Solution :`3P 5P 0`
`3P-X 5P-x-2y x`
`2NO_(2)(g)hArrN_(2)O_(4)(g)`
`5P-x-2y y`
`K_(P_(2))=(P_(N_(2)O_(4)))/((P_(NO_(2)))^(2)), 8=(P_(N_(2)O_(4)))/((0.5)^(2)`
`P_(N_(2)O_(4)=2` atm
`:.y=2atm`
`P_("TOTAL")=P_(NO)+P_(NO_(2))+P_(N_(2)O_(3))+P_(N_(2)O_(4)`
`5.5=3P-x+0.5+x+2`
`3P=3,P=1`
`5xx1-x-2xx2=0.5`atm
`K_(P_(1))=(P_(N_(2)O_(3)))/((P_(NO))(P_(NO_(2))))`
`=0.5/(2.5xx0.5)=0.4` atm
`P_(NO)=2.5 "atm" P_(NO_(2))=0.5 "atm" P_(N_(2)O_(3))=0.5"atm", P_(N_(2)O_(4))=2"atm"`
Discussion
12638.

The solutions containing 6 g of urea (molecular mass =60) per dm_(3) of water and another containing 9 g of solute A per dm^(3) of water freeze at the same temp. The molecular mass of A is

Answer»

12
90
54
150

Solution :Molality of urea solution =`6/(60 xx 1KG)=0.1M`
"As freezing POINT of both the solution are same they must have same molalities".
"Hence for solute A",
`"Molecular MASS"="mass"/("molality" xx 1 kg)=9/(0.1 xx 1 )=90`
Discussion
12639.

Which of the following plot will not be linear ?

Answer»

Plot of `LOG ""(X)/(m)` versus P
Plot of `(P)/(x//m)` versus P
Plot of `(m)/(x)` versus `1/P`
Plot of `log ""(m)/(x)` versus log P

SOLUTION :All EXPECT (d) are LINEAR
Discussion
12640.

Which of the following is amphoteric oxide?Mn_(2)O_(7), CrO_(3), Cr_(2)O_(3), CrO, V_(2)O_(5), V_(2)O_(4)

Answer»

`V_2O_5,Cr_2O_3`
`Mn_2O_7,CrO_3`
`CRO,V_2O_5`
`V_2O_5,V_2O_4`

SOLUTION :Oxides in the LOWER oxidation state are basic `(i.e. CrO, V_2,O_2)`, those in HIGHER oxidation state `(e.g. Mn_2O_7, CrO_3)` are acidic and in the intermediate state `(e.g., Cr_2,O_3, V_2O_5)` are amphotertic.
Discussion
12641.

Wurtz reaction of methyl iodide yields an organic compound X. Which one of the following reactions also yields X?

Answer»

`C_(2)H_(5)`Cl + Mg `OVERSET("dryether")(rarr)`
`C_(2)H_(5)` Cl + `"LiAlH"_(4) (rarr)`
`C_(2)H_(5)`Cl + `C_(2) H_(5)"Ona" rarr `
`CHCl_(3) underset(DELTA)overset("Ag powder")(rarr) `

Answer :B
Discussion
12642.

The vapour density of a mixture containing NO_(3) and N_(2)O_(4) is 38.3 at 27^(@)C Calcualte the moles of NO_(2) in 100g of the mixture.

Answer»

Solution :Mol. Mass of mixture `=2xx38.3=76.6`
No. of MOLES in 100g of mixture `=(100)/(76.6)`
LET a g of `NO_(2)` is present in mixture.
Moles of `NO_(2)+` moles of `N_(2)O_(4)=` Moles of mixture
`(a)/(46)+(100-a)/(92)=(100)/(76.6)` or `a=20.10g`
Moles of `NO_(2)` in mixture `=(20.10)/(46)=0.437`.
Discussion
12643.

Write one chemical equation that conc. H_2SO_4 is a strong oxidising agent.

Answer»

SOLUTION :`C+ H_2SO_4 (conc.) overset(Delta) RARR CO_2 + 2SO_2 + 2H_2O`
Discussion
12644.

What is a peptide bond or linkage? Distinguish between a peptide, oligopeptide polypeptide and protein.

Answer»

Solution :`-overset(O)overset(||)C-NH-`
amide linkage
A peptide is an amide formed by intermolecular reaction of the amino group of one amino acid and the carboxyl group of a second amino acid. Dipeptides are made from two amino acids tripeptides from three amino acids etc., which may be same or different. If there are four to ten amino acid residues, the peptide is called an oligopeptide. A poly peptide CHAIN made up of many amino acids. The terms peptide and polypeptides are often used INTERCHANGEABLY. A protein consists of one or more polypeptide chains and each chain can CONTAIN as MUCH as SEVERAL hundred amino acids. The total no. of residues may vary from 50 to over 100.
Discussion
12645.

What is SI unit of viscosity coefficient ( eta) ?

Answer»

Pascal
`NSM^(-2)`
`KM^(-2) S`
`NM^(-2)`

Answer :B
Discussion
12646.

Which are the monomers of Buna-N ?

Answer»

Buta-1,3-diene and prop-1-ene-1-nitrile
Buta-1,2-diene and ACRYLONITRILE
Buta-1,3-diene and prop-2-ene-1-nitrile
Buta-1,2-diene and prop-2-ene-1-nitrile

Solution :Buta-1,3-diene and prop-2-ene-1-nitrile
`underset(3)CH_(2)=underset(2)CH-underset(1)C-=N`
Buna-N is a POLYMER of Buta-1,3-diene and acrylonitrile
Discussion
12647.

Which of the following statements is true-

Answer»

in hexagonal close-packed arrangement of spheres, the spheres of the first and FOURTH layers have the same VERTICAL alignment
in cubic close-packed arrangement of spheres, the sphere of the first and THIRD laters have the same vertical alignment
in cubic close-packed structure, the fifth LAYER repeats the SECOND layer
hexagonal arrangement in three dimensions is less closely-packed than the cubic arrangement

Answer :C
Discussion
12648.

Which of the following does not react with ethers to form coordination complexes ?

Answer»

`BF_(2)`
`RMgX`
`AICI_(3)`
`C_2H_5ONa`

SOLUTION :NA
Discussion
12649.

The two liquids A and B have the same molecular weight and form an ideal solution. The solution has the vapour pressure 700 mmHg at 80^@C . The above solution is distilled without reflux till 3/4 of the solution is collected as condensate. The composition of the condensate is x'_A=0.75and that of the residue is x_A = 0.3. If the vapour pressure of the residue at 80^@C is 600 mmHg, calculatex_A, P_A^@and P_B^@

Answer»

SOLUTION :0.635, 809.39 MM, 509.69 mm
Discussion
12650.

Which method is used to get pure ethanol ?

Answer»

Membarane TECHNOLOGY
Esterification
FERMENTATION METHOD
NONE of these

Solution :Membarane Technology
Discussion