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15351.

What happens when concentrated sulphuric acid is added to formic acid ? Give equation.

Answer»

Solution :When sulphuric acid is added to FORMIC acid, it FORMS carbon monoxide and WATER.
`HCOOH OVERSET (H_2SO_4)rarr CO + H_2O`
Discussion
15352.

The species with an atom in +6 oxidation state is

Answer»

`MnO_(4)^(-)`
`Cr(CN)_(6)^(3-)`
`NiF_(6)^(2-)`
`CrO_(2)Cl_(2)`

ANSWER :B::C::D
Discussion
15353.

Which of the following metal exhibits photoelectric effect readily?

Answer»

Cs
Na
Li
Mg

Answer :A
Discussion
15354.

While writing the formula of ferrous oxide it is written as (FeO), because it is

Answer»

Non-stoichiometric
Non-existant
Paramagnetic
Ferromagnetic

Answer :A
Discussion
15355.

What amount of calcium is required to produce 5.6of CaO ?

Answer»


ANSWER :4.0 G of CALCIUM
Discussion
15356.

Which of the following hydrogen halides has the lowest boiling point?

Answer»

HCl
HF
HI
HBr

Answer :A
Discussion
15357.

Which one of the following is not used as a filler in laundry soaps?

Answer»

SODIUM SILICATE
Glycerol
Sodium rosinate
borax

Answer :B
Discussion
15358.

Use the data in Q.8 and find out which of the following is the strongestoxidising agent.

Answer»

`Cl^(-)`
`Mn^(2+)`
`MnO_(4)^(-)`
`Cr^(3+)`

Solution :(c ) `MnO_(4)^(-)` is the stronger oxidising agent because `E^(Ï´)` value is maximum in this CASE. In other words,the NEGATIVE `E^(Ï´)` value is minimum in this case.
Discussion
15359.

When metal 'M' is treated with NaoH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is

Answer»

Ca
Al
Fe
Zn

Solution :
Discussion
15360.

Explain what happens when HCl gas is passed through concentrated NaCl solution?

Answer»

Solution :NACL is precipitated from its solution
`NaCl rarr NA^++ Cl^-`
`HCL rarr H^++Cl^-`
Discussion
15361.

Write the chemical equation for preparing sodium soap from glyceryl oleate and glyceryl palmitate. Structural formulae of these compounds are given below : (i) (C_(15)H_(31)COO)_(3)C_(3)H_(5) - Glyceryl palmitate. (ii) (C_(17)H_(32)COO)_(3)C_(3)H_(5) - Glyceryl oleate.

Answer»

SOLUTION :
Discussion
15362.

Which complex is used as an antiumor drug in cancer treatment ?

Answer»

`CA`-EDTA chelate
EDTA
`TiCl_(4)+AL(C_(2)H_(5))_(3)`
Cis-Platin

Answer :A::C::D
Discussion
15363.

Which among the following species have sp^(2) hybrid N-atom ?

Answer»

Nitrobenzene
Trimethylamine
Pyrrole
Acetaldoxime.

Solution :
`CH_(3)CH = NOH` are `SP^(2)` hybridised
Discussion
15364.

Which of the following has highest knocking property

Answer»

OLEFINS
Branched CHAIN olefins
STRAIGHT chain olefins
Aromatic hydrocarbons

Solution :Straight chain olefins has HIGHEST KNOCKING
Discussion
15365.

Which one of the following is an example of a hydrophilic colloidal sol?

Answer»

RUBBER in water
Rubber in benzene
Starch in ALCOHOL
`AS_2S_3` in benzene

Answer :C
Discussion
15366.

The vapour pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20^(@)C, its vapour pressure was 183 torr. The molar mass (g mol-') of the substance is :

Answer»

128
488
32
64

Solution :Using RELATION,
`(p^(@) -p_(s))/(p _(s))=(w_(2) M_(1))/(w_(1)M_(2))`
`w_(2), M_(2)=` mas in g and MOL MASS of solvcnt `w_(2), M _(2)=` mass in g and mol. Mass of solutc
Let `M_(2) =x`
`p^(@)=185` torr
`p _(s) =183 ` torr
`(185-183)/(183)=(1.2xx58)/(100x)` (mol. mass of acctone = 58)`
`x= 64`
`THEREFORE ` Molar mass of SUBSTANCE = 64
Discussion
15367.

Which is the IUPAC name of{:(""C_(2)H_(5)),("|"),(CH_(3)-C-CH_(2)Cl),("|"),(""C_(2)H_(5)):}

Answer»

1-chloro-2, 2-diethylpropane
3-chloro-2, 2-diethylpropane
1-chloro-2-ethyl-2-methylethane
1-chloro-2, 2-diethyl-2 methylethane

ANSWER :C
Discussion
15368.

Which of the following type of cubic lattice hasmaximum number of atoms per unit cell ?

Answer»

Simple CUBIC
Body centred cubic
FACE centred cubic
All have same

Solution : No. of atoms per UNIT cell are : simple = 1, BCC = 2, fcc = 4.
Discussion
15369.

Which of the following compounds will give isocyanide test with CHCL_(3)//KOH ?

Answer»




ANSWER :A::C
Discussion
15370.

Which of the following compounds has the greater dipole moment?

Answer»


SOLUTION :N//A
Discussion
15371.

When atoms are placed at the corners of all 12 edges of a cube in a unit cell, how many atoms are present per unit cell? Also name this unit cell.

Answer»

SOLUTION :8 COMERS only. So `8 xx 1/8` =1 UNIT CELL is PRIMITIVE unit cell.
Discussion
15372.

What is the reaction quotient , Q for the cell Ni_((s)) | Ni^(2+) (0.190 M) || Cl^(-) (0.40 M) | Pt_((s)) Cl_(2(g)) (1.0 atm)

Answer»

`3.1 xx 10^(-1) `
` 1.3 xx 10^(-1) `
` 8.0 xx 10^(-2)`
`3.0 XX 10^(-2)`

SOLUTION :`NI + Cl_2 to Ni^(+2) + 2Cl^(Ɵ) , Q = ((Ni^(+2))(CL^(Ɵ))^(2))/((PCl_2)^(1)) =(0.190 xx (0.4)^2)/(1) = 0.0304 = 3.04 xx 10^(-2)`
Discussion
15373.

The simultaneous solubility of AgCN (K_(sp)=2.5xx10^(-6))and AgCl (K_(sp)=1.6xx10^(-10)) in "1 M NH"_(3)(aq) are respectively Given K_(f)[Ag(NH_(3))_(2)]^(+)=10^(7)

Answer»

`1.58xx10^(-3), 1.26xx10^(-5)`
`0.04, 6.25xx10^(-8)`
`5.58xx10^(-8), 0.037`
`0.037, 5.78xx10^(-8)`

ANSWER :D
Discussion
15374.

Which does not contribute significantly to acid rains ?

Answer»

`CO`
`NO_(2)`
`CO_(2)`
`SO_(2)`

ANSWER :A
Discussion
15375.

Which of the following sols can only be prepared by boiling the dispersed phase with dispersion medium?

Answer»

EGG ALBUMIN sol in water
Gum sol in water
`FE(OH)_(3)` sol in water
STARCH sol in water

Solution :Starch sol in water can only be prepared by boiling.
Discussion
15376.

Which of the following species is more soluble in water ?

Answer»

`M(OH)_3 : K_sp=10^(-35)`
`M(OH) : K_sp=10^(-30)`
`M(OH) : K_sp=10^(-28)`
`MOH : K_sp=10^(-26)`

Answer :A
Discussion
15377.

The root mean square speeds at STP for the gasesH_(2),N_(2), O_(2) and HBr are in the order :

Answer»

`H_(2)ltN_(2)ltO_(2)ltHBr`
`HBrltO_(2)ltN_(2)ltH_(2)`
`H_(2)ltN_(2)=O_(2)ltHBr`
`HBrltO_(2)ltH_(2)ltN_(2)`

Solution :`PV=1/3mNu^(2)=1/3mu^(2)`
or `u=sqrt(3PV//M)`
at STP u `alphasqrt(1/M)`
i.e., HIGHER will be the molar MASS lower will be the value of `u_(RMS)`.
Molecular masses of `H_(2), N_(2), O_(2)` and HBR are 2,28,32 and 81. Hence the correct order is `HBr lt O_(2) lt N_(2) lt H_(2)`.
Discussion
15378.

The standard reduction potential for Fe^(2+)//Fe and Sn^(2+)//Sn electrode are -0.44 and -0.14 volt respectively. For the givencell reaction Fe^(2+)+SntoFe+Sn^(2+), the standard EMF is:-

Answer»

`+0.30V`
`-0.58V`
`+0.58V`
`-0.30V`

Solution :For the cell reaction, FE acts as cathode as Sn as ANODE. Hence,
`E_(cell)^(o)=E_(cathode)^(o)-E_("anode")^(o)=-0.44-(-0.14)=-0.30V`
the NEGATIVE EMF suggests that the reaction goes spontaneously in reverse DIRECTION.
Discussion
15379.

Which of the following is the chemical name of Vitamin B_12 ?

Answer»

FOLIC ACID
COBALAMIN
Pyridoxime
RIBOFLAVIN

ANSWER :B
Discussion
15380.

Which of the following lossses chirality when heated ?

Answer»




ANSWER :B
Discussion
15381.

The specific rate constant of a reaction depends on the

Answer»

CONCENTRATION of the reactant
time
temperature
concentration of the PRODUCT

ANSWER :C
Discussion
15382.

Which adsorption takes place by strong chemical bond ?

Answer»

physisorption
CHEMISORPTION
reversible adsorption
none of these

SOLUTION :chemisorption
Discussion
15383.

The standard reduction potentials of Fe^(3+)//Fe " and "Fe^(2+)//Fe electrode system are -0.035 V and -0.44 V respectively. Predict which of the two oxidations is easy. Fe^(3+)//Fe " and " Fe^(2+)//Fe.

Answer»

Solution :(i) The ION which has lower reduction potential will be oxidised first at the anode.
(II) AMONG (0.035V) and (0.44V), `Fe^(2+)//Fe` oxidation is easy because it has the lower reduction potential (-0.44V).
Discussion
15384.

Which of the following IUPAC name is correct ?

Answer»

2-methyl-3-ethylpentane
2-ethyl-3-methylpentane
3-ethyl-2-methylpentane
3-methyl-2-ethylpentane

Answer :C
Discussion
15385.

To find molelular mass of diabasic acid by silver salt method following graph is plotted then approximate molecular weight of acid is - where y = weight of silver residue ( in gm) x = weight of silver salt (in gm)

Answer»

160 gm
158 gm
320 gm
240 gm

Solution :`TAN 30^(@) = (W_(Ag))/(W_(Ag - "Salt")) = (1)/(sqrt3)`
`(W_("salt"))/(W_(Ag)) = sqrt3`
`M_(WT) "of" H_(2)X = 2 (108 (W_("Salt"))/(W_(Ag )) - 107)`
`= 2 (108 XX sqrt3 - 107)`
`= 2 (187.056 - 107)`
`= 2 xx 80.056`
`= 160.112 gm`
Discussion
15386.

Which compound in each of the following pairs will react faster in S_(N)2 reactionwith ""^(Θ)OH ?(i) CH_(3)Br or CH_(3)I(ii) (CH_(3))_(3)C Cl or CH_(3)Cl

Answer»

Solution :(i) Due to large size of iodine, the C - I bond is a WEAK bond as compared to C - Br. Also, `I^(-)` is a better leaving group. So, `CH_(3) - I` will react with `""^(Θ)OH` via `S_(N)2` than `CH_(3)-Br`.

(ii) In `S_(N)2` reaction, the nucleophile attacks from the opposite side of the leaving group. The attack is favoured if there is presence of small groups i.e., minimum steric HINDRANCE. Thus, `CH_(3)Cl` will react faster via `S_(N)2`.
Discussion
15387.

When H_(2)S gas is passed through the HCl containing aqueous solutions of CuCl_(2),HgCl_(2),BiCl_(3) and CoCl_(2), which does not precipiate out

Answer»

`CuS`
`HGS`
`Bi_(2)S_(3)`
`CoS`

SOLUTION :COBALT sulphide does not ppt. out SECOND group.
Discussion
15388.

When acetylene is passed through dil .H_2SO_4 in the presence of HgSo_4 the compound formed is :

Answer»

`C_2H_5OH`
acetone
acetic ACID
ACETAL dehyde

Answer :D
Discussion
15389.

Write the correct formulae for the following coordination compounds : (i) CrCl_(3).6 H_(2)O (violet with 3 chloride ions precipitated as AgCl) (ii) CrCl_(3).6H_(2)O (light green colour with 2 chloride ions precipitated as AgCl) (iii) CrCl_(3).6H_(2)O (dark green colour with 1 chloride ion precipitated as AgCl).

Answer»

SOLUTION :Remembering that coordination of Cr is 6, we have
(i) `[Cr(H_(2)O)_(6)]Cl_(3)`
(ii) `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`
(III) `[Cr(H_(2)O)_(4)Cl_(2)]Cl.(2 H_(2)O)`.
Discussion
15390.

The type of adsorption depicted by the adsorption isobar

Answer»

PHYSICAL
Chemical
Both (1) and (2)
NONE of these

Answer :A
Discussion
15391.

The triad of nuclei that represents isotopes is :

Answer»

`""_(6) C^(14) , ""_(7)N^(14) , ""_(9)F^(19)`
`""_(6)C^(12) , ""_(7) N^(14) , ""_(9) F^(19)`
`""_(6) C^(14) , ""_(6) C^(13) , ""_(6)C^(12)`
`""_(6) C^(14), ""_(7)N^(14) , ""_(9) F^(17)`

SOLUTION :Isotopes = same .Z.
Discussion
15392.

Which of the folliwng is the correct order of the order of the rate of reaction of C_(6)H_(6), C_(6)D_(6) and C_(6) T_(6) towards nitration?

Answer»

`C_(6) H_(6) gt C_(6) D_(6) gt C_(6) T_(6)`
`C_(6) H_(6) = C_(6) D_(6) =C_(6) T_(6)`
`C_(6) H_(6) gt C_(6) D_(6) = C_(6) T_(6)`
`C_(6)T_(6) gt C_(6) D_(6) gt C_(6) H_(6)`

Solution :SULPHONATION is a reversable process and shows `1^(@)` kinetic isotope effect, wheras other `SE` reactiosn (i.e. nitration halogation, etc.) do not show `1^(@)` kinetic isotope effect.
Discussion
15393.

What mass of isobutylene is obtained from 37 g of tertiary butyl alcohol by heating with 20% H_(2)SO_(4) at 363 K if the yield of the reaction is 65%?

Answer»

12.8 g
21.8 g
18.2 g
28.1 g

Solution :`(CH_(3))_(3)COH underset(Delta)overset(20% H_(2)SO_(4))to (CH_(3))_(2)C =CH_(2)+H_(2)O`
74 g of t-BUOH give isobutylene = 56 g
`:.` 37 g of t-BuOH will give isobutylene = `(56)/(74) xx 37 = 28 g`
But the yield of the reaction = 65%
`:.` Wt. of isobutylene ACTUALLY formed = `(28 xx 65)/(100)= 18.2g`
Discussion
15394.

Water is more acidic than alcohol

Answer»


ANSWER :T
Discussion
15395.

Which statement is correct for H_3PO_3 and H_3PO_4 ?

Answer»

`H_3PO_3` is a monobasic and REDUCING AGENT.
` H_3PO_3` is a dibasic & reducing agent.
`H_3PO_4` is a TRIBASIC and reducing agent.
`H_3PO_4` is a tribasic and oxidising agent.

Answer :B
Discussion
15396.

Which method is used to get very pure germanium used in semiconductor ?

Answer»

ELECTROLYSIS 
Vapour-phase REFINING 
LIQUATION 
ZONE - refining 

ANSWER :D
Discussion
15397.

Which of used for the formation of nylon-6,6

Answer»

SULPHUROUS acid
Adipic acid
Sulphurous hexafluoride
Phthalic acid

Answer :B
Discussion
15398.

Which of the following compound gives ethylmethyl ketone on oxidation?

Answer»

Propan-2-ol
Butan-1-ol
Butan-2-ol
2-Methyl butan-2-ol

Answer :C
Discussion
15399.

Write the dispersed phase and dispersion medium of paints ?

Answer»

SOLUTION :DISPERSED PHASE - Solid.
Dispersion Medium - Liquid.
Discussion
15400.

Which of the following esterification reactions are unimolecular?

Answer»




ANSWER :B::C::D
Discussion