Which of the following compounds when heated with CO at 150"C and 500 atm pressure in presence of BF3 forms ethyl propionate ?
C2H5OH
CH3OCH3
C2H5OC2H5
CH3OC2H5
A cylinder of gas contains 14.5 kg of butane. If a family needs 2.5x104 KJ of energy per day for cooking. Hoe long will the cylinder last. (Enthalpy of combustion of butane=2600 KJ/mole)
26 days
52 days
13 days
116 days
The gas that is used for sterilizing water is
SO2
NO2
O3
NH3
Cuprous ion is colourless while cupric ion is coloured because :
both have unpaired electrons in the'd' orbital
cuprous ion has completed d-orbital and cupric ion has incomplete d-orbital
both have half-filled p and d orbitals.
cuprous ion has incompleted d-orbitals and cupric ion has a completed d-orbital
Which of the following reacts with benzene in presence of anhydrous aluminum chloride and forms acetophenone ?
CH3CI
CH3COOH
CH3CHO
CH3COCl
Which of the following pairs of ions are colourless ?
Ti3+, Cu2+
Sc3+, Zn2+
Co2+, Fe3+
Ni2+, V3+
What is the temperature at which the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of 0.4 moles of Argon at 400 K ?
400 K
873 K
533 K
300 K
Observe the following statements regarding purification of bauxiteI. During Hall's process, silica is removed as Si (vapour)II. Bauxite ore contaminated with Fe2O3 is purified in Baeyer's processIII. During Serpeck's process, AlN is formedThe correct answer is
I, II and III are correct
Only I and II are correct
Only I and III are correct
Only II and III are correct
In lime kiln the reaction CaCO3(s)⇔CaO(s)+CO2(g)
Attains a state of equilibrium after sometime
Stops after some time
Does not take place at all
Goes to completion eventually
'Natalite' is used as
anesthetic
substitute for petrol
insecticide
preservative
The equilibrium constant Kp for the reaction 2SO2+O2⇔2SO3 is 2.5 atm-1.What would be the partial pressure of O2 at equilibrium. If the equilibrium partial pressures of SO2 and SO3 are equal
304mm
30.4mm
0.04mm
760mm
Which of the following has the highest first IP
Al
Si
K
P
Electrons with a kinetic energy of 6.023 x 104 J/mol are evolved from a surface of a metal, when it is exposed to radiation of wavelength of 600 nm, The minimum amount of energy required to remove an electron from the metal atom is
2.3125 X 10-19 J
3 X 10-19 J
6.02 X 10-19 J
6.62 X 10-34 J
Which of the following not obtained when methyl chloride and n-propyl chloride react with sodium in dry ether
C2H6
C3H8
C4H10
C6H14
What is the quantity of electricity (in Coulombs) required to deposit all the silverfrom 250 mL of 1 M AgNO3 solution
2412.5
24125
4825.0
48250
The order of pH of 0.200 M solutions of NH4NO3, NaNO3 and Na2CO3 is
NH4NO3 < Na2CO3 < NaNO3
NH4NO3 < NaNO3 < Na2CO3
Na2CO3 < NaNO3 < NH4NO3
NaNO3 < NH4NO3 < Na2CO3
For the reaction A(g)⇔B(g)+C(g),Kp at 4000C is 1.5x10-4 and Kp at 6000C is 6x10-3 Then the incorrect statement is
The reaction is an exothermic one
Increase in temperature increases the formation of B
Increase in pressure increase the formation of A
A decrease in temperature and increase in pressure shifts the equilibrium towards left
The weakest acid among the following is
H2SeO3
H2SeO4
H2SO3
H2SO4
The number of π bonds in the product formed by passing acetylene through dil.H2SO4 containing mercuric sulphate is:
zero
one
two
three
How many electrons are present in the M shell of an atom of an clement with atomicnumber 24 (Z = 24) ?
5
6
12
13
In the reaction AlCl3+Cl-→[AlCl4]-,AlCl3 acts as
Lewis base
Lewis acid
Salt
Bronsted acid
The IUPAC name of the compound(CH3)2CH-CH=CH-CHOH-CH3 is
5-methyl-hex-3-en-2-ol
2-methyl-hex-3-en-5-o
2-hydroxy-5-methy!-3-hexene
5-hydroxy-2-mcthy!-3-hexene
The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be
25 : 9
5 : 3
9 : 25
3 : 5
The equilibrium constants for the reactions N2(g)+O2(g)⇔2NO(g) and NO(g)+1/2 O2(g) are K1 and K2 respectively .Then the equilibrium constant for the reaction N2(g)+O2(g)⇔2NO2(g) is
K1/K2
K12-K22
K1 x K22
K1 - K22
Bauxite is a mineral for the extraction of :
Ca
Cu
AI
Fe
The functional groups present in 'salol' are
—NH2 and —OR
OH and —COR
—NH2 and —COOH
—OH and —COOR
The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO3)3 is (At. wt. of Al = 27)
4
2
3
1
Method used for the concentration of tinstone ore is
Hand picking
froth floatation
Electromagnetic separation
Leaching
One mole of N2H4 loses 10 moles of electrons to form a new compound Z.Assuming that all the nitrogens appear in the new compound, what is the oxidation state of nitrogen in Z? (There is no change in the oxidation state of hydrogen)
-1
-3
+3
+5
Which of the following is an example of interstitial hydride
CH4
ZnH2
H2O
The Kc for the reaction A+B↔C is 4 and Kc for 2A+D↔C is 6. The value of Kc for C+D↔2B is
0.67
0.375
2.7
1.5
Consider the two gaseous equilibria involving SO2 and the corresponding equilibrium constants at 298K SO2(g)+1/2O2(g)⇔SO3(g);K1 2SO3(g)⇔2SO2(g)+O2(g);K2 The values of the equilibrium constants are related by
K2=K1
K2=K12
K2=1/K12
K2=1/K1
A certain current liberated 0.504g of hydrogen in 2hrs. How many grams of copper can be librated by the same current flowing for the same time in a copper sulphate solution
12.7g
15.9g
31.8g
63.5g
The salt of phosphorous acid are called
Phosphides
Hypophosphites
Phosphites
Phosphates
The nature of forces operating between the adsorbate and the adsorbent in the adsorption occurring at high temperature is
Vander waals forces
Chemical forces
Gravitational forces
Fermi forces
The rate equation for the reaction A+2B→products is rate=K[A][B]2. If the volume of the vessel is decreased to half of the initial volume the reaction rate bears the following relation to the original rate
8 times
4 times
2 times
1/2
A radioactive substance 88X228 (IIA) emits 3α and 3β particles to form "Y". To which group of long form of the periodic table does "Y" belong
IVA
VA
VIA
VIIA
Average C-H bond energy is 416 kJ. mol-1. Which of the following is correct ?
CH4(g) + 416kJ→C(g) + 4H(g)
CH4(g) →C(g) + 4H(g) + 416kJ
CH4(g) +1664kJ→C(g) + 4H(g)
CH4(g) →C(g) + 4H(g) + 1664kJ
A radio isotope has a half life 10 days.If today there is 125g of it left,what was its weight 40 days earlier?
600g
1000g
1250g
2000g
Which of the following elements has least number of electrons in its M shell ?
Mn
Ni
Sc
Given the bond energies of N = N, H — H and N—H bonds as 945, 436 and 391 kj/mol respectively, the enthalpy of the reaction N2(S) + 3H2 (g) —> 2NH3(g) is :
-93kJ
102kJ
90kJ
105kJ
The bonds in K4Fe(CN)6 are:
ionic
covalent
ionic and covalent
ionic,covalent and co-ordinate covalent bond
The concentration of oxalic acid is 'x'mol L-1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMn04. What is the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociates completely)
1.3
1.699
H3O++OH-→2H2O
Both Lewis neutralization and Bronsted neutralisation
Lewis neutralisation
Bronsted neutralisation
Arrhenius neutralisation
Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?
EN = IP x EA
EN = IP / EA
EN = (IP + EA) / 2
EN = IP - EA
What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulpher into sulpher dioxide
11.2
22.4
33.6
44.8
Which of the following functional group shows +R effect
–CHO
–NO2
–CN
–NR2
Assertion (A) : At 300 K,kinetic energy of 16 g of methane is equal to the kinetic energy of 32 g of oxygen. Reason (R) : At constant temperature,kinetic energy of one mole of all gases is equal. The correct answer is:
Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true and (R) is the not correct explanation of (A)
(A) is true but (R) is not true
(A) is not true but (R) is true
A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?
P / 5
P / 2
P / 2.5
3P / 4
Bauxite is boiled with aqueous NaOH solution. Sodium meta aluminate solution is formed. This part in the metallurgy of aluminium is called
Liquation
Amalgamation
Calcination
What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminum chloride ?
C8H10
C6H6
C8H8
C6H5Cl
Which one of the following compounds liberates CO2 from aqueous NaHCO3
Aluminium chloride
CHCl3
CCl4
CH3Cl
Which of the following alkali metals has the greatest tendency for the half reaction; M(g) →M+(aq) + e
Sodium
Lithium
Potassium
Cesium
The two sulphur atoms in Na2S2O3 have
Same oxidation state
+6 and -2 oxidation states
+4 and +6 oxidation states
-2 and +4 oxidation states
Oxide of nitrogen which gives reddish brown colour when exposed to air is
NO
N2O3
N2O
The energy of a photon is 3 x 10-12 ergs.What is its wavelength in nm ?( h = 6.62 x 10 -27ergs-s ; c = 3 x 10 10 cm/s )
662
1324
66.2
6.62
1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the Atomic weight of Cd
118
112
106.5
53.25
A sample of 100ml water required 0.294mg of K2Cr2O7(mol.wt=294)for oxidizing dissolved organic compounds in it. The C.O.D of water sample is
0.04 ppm
0.48 ppm
0.005 ppm
294 ppm
Dipole moment of HC1 = 1.03 D, HI = 0.38 D. Bond length of HC1 = 1.3 and HI = 1.6A .The ratio of fraction of an electric charge, δ, existing on each atom in HC1 and HI is
12 : 1
2.7 : 1
3.3 : 1
1 : 3.3
The earthy impurities present in the mineral are called
Flux
Slag
Gangue
Refractory material
The cell reaction of a cell is Mg(g)+Cu2+(aq)→Cu(g)+Mg2+(aq).If the standard reduction potentials of magnesium and copper are -0.33 and +2.38V respectively,the e.m.f of the cell is:
+2.03V
-2.03V
+2.71V
-2.71V
deleted
If a gas contains only three molecules that move with velocities of 100,200,500 ms-1.What is the rms velocity of that gas in ms-1
100√8/3
100√3
100√10
800/3
The vapour pressure of water at 230C is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 g of water. What is the vapour pressure (in mm) of the resultant solution
19.0
19.602
19.402
19.202
The metal used for the de-bromination reaction of 1, 2 dibromoethane
Na
Zn
Mg
Li
The molar capacity(Cp)of water at constant pressure is 75 J.K-1.mol-1.The increase in temperature (in K) of 100 g of water when 1 K.J. of heat is supplied to it is
2.4
0.24
0.13
The addition of HCl will not suppress the ionization of
H2S
benzoic acid
A certain mass of a gas occupies a volume of 2 L at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant
100K
273K
273oC
546oC
In Freundlich adsorption isotherm, the intercept is equal to
k
log k
1/n
log x/m
If ΔE is the heat of reaction for C2H5OH(1)+3O2(g)→2CO2(g)+3H2O(l) at constant volume,the ΔH(Heat of reaction at constant pressure)at constant temperature is
ΔH=ΔE+2RT
ΔH=ΔE-2RT
ΔH=ΔE+RT
ΔH=ΔE-RT
A certain sample of gas has a volume of 0.2 litres measured at 1 atm. pressure and 00 C. At the same pressure but at 273 0c. Its volume will be
0.4 litres
0.8 litres
27.8 litres
55. 6 litres
Atoms of different elements having identical mass are known as :
isotopes
isobars
isotones
isomers
The compound prepared by a substitution reaction of benzene is
acetophenone
glyoxal
cyclohexane
hexabromo cyclohexane
The value of Kp for the reaction 2H2S(g) ⇔ 2H2(g) + S2(g) is 1.2X10-2 at 10650C.The value of KC for the reaction
1.2x10-2
83
>1.2x10-2
Which of the following reacts with ammoniacal cuprous chloride
C2H2
The froth floatation process is used for the concentration of
Ore having low density
Ore having magnetic nature
Ore having high density
Ore having water soluble gangue
Assertion (A) : A catalyst increases the rate of a reaction.Reason (R) : In presence of a catalyst, the activation energy of the reaction increases. The correct answer is
Both (A) and (R) are true but (R) is notcorrect explanation of (A)
(A) is true, but (R) is not true
(A) is not true, but (R) is true
The reagent used in the preparation of aspirin from salicylic acid is
SOCl2 / pyridine
CH3COOH / HCl
(CH3CO)2O/conc. H2SO4
CH3Cl / AlCl3
One mole of fluorine is reacted with two moles of hot concentrated KOH. The products formed are KF, H2O and O2. The molar ratio of KF, H2O and O2 respectively is
1:1:2
2:1:0.5
1:2:1
2:1:2
In the reaction AlCl3+Cl-→AlCl4-, AlCl3 is
Any of these
Lewis salt
Which pair of oxyacids of phosphorous contain ‘P - H' bonds
H3PO4, H3PO3
H3PO5, H4P2O7
H3PO3, H3PO2
H3PO2 , HPO3
Which of the following is correct
The number of electrons present in the valence shell of S in SF6 is 12
The rates of ionic reactions are very slow
According to VSEPR theory, SnCl2 is a linear molecule
The correct order of ability to form ionic compounds among Na+, Mg2+ and Al3+ is Al3+ > Mg2+ > Na+
Which of the following does not participate in carbylamine reaction?
KOH
Ethanal
Chloroform
Aniline
Number of coulombs of current required to convert completely 1 mole of MnO4-ions in acid medium to one mole of Mn2+ions electrolytically is
96500x6
96500x2
5x96500
96500
when acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that
Cu2O
CuO
CuSO4
Assertion (A) : K, Rb and Cs form superoxides.Reason (R) ; The stability of the superoxides increase from 'K' to 'Cs' dueto decrease in lattice energy. The correct answer is
Both (A) and (R) are true but (R) is not the correct explanation of (A
(A) is not true but (R) istrue
In 0.01 M solution,HCN is 0.01% ionized. Its dissociation constant is
10-6
10-10
10-3
10-5
The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is
Spin
Azimuthal
Magnetic
Principal
Which of the following is not correct
Chlorophyll is responsible for the synthesis of carbohydrates in plants
The compound formed in the addition of oxygen to haemoglobin is called oxyhaemoglobin
Acetyl salicylic acid is known as aspirin
The metal ion present in vitamin B12 is Mg2+
Bhopal gas tragedy of 1984 was caused by
carbon monoxide
phosgene
methyl cyanate
methyl isocyanate
The hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6
5x10-8
5x10-6
5x10-9
2.5x10-7
The method of separation of enantiomers from racemic mixture is known as
Inversion
Racemisation
Resolution
Asymmetric synthesis
For the reaction 2SO2(g)+O2(g)2SO3(g) taking place in one litre vessel, the number of moles of SO2 ,O2,SO3 at equilibrium are 2,1 and 2 moles respectively, under a total pressure of 15 atm.The Kp of the reaction is
1/6 atm
1/3 atm
3 atm
3atm-1
Zn(s)+Cu+2(ag)→Cu(s)+Zn+2(ag)Given that ΔfG0 for Cu+2(ag) and Zn+2(ag) are +65.0 K.J.mol-1 and -147.2 K.J.mol-1 respectively then the standard Gibbs energy change for the above reaction is
266.2 KJ
111.2 KJ
-212.2 KJ
-82.2 KJ
The magnetic oxide of iron is
Limonite
Siderite
magnetite
Haematite
For a reaction A+B→ products,the rate of the reaction was doubled.When the concentration of A was doubled.When the concentration of A and B were doubled.The order of the reaction with respect to A and B are
1,1
2,0
1,0
0,1
When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAlH4 gives X. X and Y respectively are :
C2H5OH, CH3COOH
CH3COCH3, CH3COOH
C2H5OH, CH3C0CH3
CH3CH0, CH3COCH3
Calculate the hydrolysis constant of a salt of a weak acid(Ka=2x10-6) and of a weak base(Kb=5x10-7)
10-4
10-2
10-8
Which of the following statements is not correct ?
In oxyhemoglobin Fe2+ is paramagnetic
During respiration the size of Fe2+ increases when it changes from diamagnetic to paramagnetic state.
Four heme groups are present in haemoglobin
Heme is the prosthetic group and it is non-protein part.
The oxidation states of nitrogen in NH4NO3 is /are
-3,+5
-3,-3
-3,+4
-5,+3
The rate of the reaction at 400C is 5 units.The rate of same reaction at 800C is nearly(temperature coefficient)
10 units
40 units
20 units
80 units