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16651.

Which of the following is known as Ruby Copper:

Answer»

`Cu_2O`
`CU(OH)_2`
`CuCI_2`
`Cu_2CI_2`

ANSWER :A
Discussion
16652.

Which of the following is not conductor ?

Answer»

Cu
GLASS
`NaCl_((AQ))`
Silicon

Solution :Glass
Discussion
16653.

The uncertainty in the position of an electron (mass =9.1xx10^(-28)g) moving with a velocity of3.0xx10^(4)cms^(-1) accurate up to 0.011% will be

Answer»

1.92 cm
7.68 cm
0.175 cm
3.85cm

Solution :Applygin Heisenberg.s uncertainty principle
`Deltax=h/(4pixxm XX Deltav)`
`=(6.6xx10^(-27)("ERGS")XX100)/(4xx3.14xx9.1xx10^(-28)xx3xx10^(4)xx0.011)`
`=0.175cm`
Discussion
16654.

Which of the following is found in cod-liver oil?

Answer»

vit-A
vit-C
vit-E
vit-`B_1`

ANSWER :A
Discussion
16655.

Total number of isomeric acids can be calculate by formula

Answer»

`I = 2^(N-1)`
`I = 2 ^(n-3)`
`I = 2^(n)`
`I = 2^(n-2) - 1`

ANSWER :B
Discussion
16656.

What are thefunctions of lipidsin livingorganism ?

Answer»

Solution :Biological importance of lipids :
(i) Lipids are the integral component of CELL membrane. They are necessary of structural INTEGRITY of the cell.
(ii) The main function of triglycerides in animals is as an energy reserve. They yield more energy than carbohydrates and proteins.
(iii) They act as protective coating in aquatic organisms.
(iv) Lipids of connective tissue give protection to internal organs.
(v) Lipids help in the absorption and transport of fat soluble VITAMINS.
(vi) They are essential for activation of enzymes such as lipases.
(vii) Lipids act as emulsifier in fat metabolism.
Discussion
16657.

Which of the following reagent will not be able to produce acetyl chloride by its reaction with acetic acid?

Answer»

`PCl_(5)`
`SOCl_(2)//PY`
`PCl_(3)`
`Cl_(2)`

ANSWER :D
Discussion
16658.

Which of the following carbohydrates develops blue colour on treatment with iodine solution?

Answer»

GLUCOSE
Amylose
Starch
Fructose

Solution :N//A
Discussion
16659.

Which of the following process does not occur at the interface of phases ?

Answer»

Crystallization
Heterogeneous CATALYSIS
HOMOGENEOUS catalysis
Corrosion

SOLUTION :There is no INTERFACE in homogeneous catalysis.
Discussion
16660.

When orthoboric acid (H_(3)BO_(3)) is strongly heated, the residue left is

Answer»

METABORIC acid
Boron
boric anydride
BORAX

Solution :`2H_(3)BO_(3) overset("Strong heating")to B_(2)O_(3) +3H_(2)O`
Discussion
16661.

Which one of the alkali metals, forms only, the normal oxide, M_(2)O on heating in air ?

Answer»

Rb
K
Li
Na

Solution :Only LITHIUM FORMS MONOXIDE on HEATING in AIR.
Discussion
16662.

Which one is diamagnetic?

Answer»

`ClO_2`
`Cu^(2+)`
`F^-`
`NI^(2+)`

Answer :C
Discussion
16663.

Write the chemical reaction of carbonyl group with (i) H_(2)O (ii) HCN (iii) Na^(+)HSO_(3)^(-)

Answer»

SOLUTION :
Discussion
16664.

What is the sweetness value of sucralose in comparison to sucrose ?

Answer»

160
550 
600
2000 

SOLUTION :600
Discussion
16665.

Why can we not determine the order of a reaction by taking into consideration the balanced chemical equation?

Answer»

Solution :Balanced chemical often leads to incorrect order or rate. For example the FOLLOWING reaction seems to be tenth orderreaction.
`KClO_(3)+6FeSO_(4)+3H_(2)SO_(4) to KCl+3H_(2)O+3Fe_(2)(SO_(4))_(3)`
This is actually a second order reaction. The reaction is complex and OCCURS in several steps. The order of such reaction is determined by the SLOWEST step in the reaction mechanism. Order is determined experimentally and observed rate of reaction is DEPENDENT on the concentration of reactants.
Discussion
16666.

Which of the following silver halide is insoluble in water but soluble in liquid ammonia

Answer»

SILVER fluoride
Silver chloride
Silver bromide
Silver Iodide

Answer :B
Discussion
16667.

Which of the statements regarding is incorrect.

Answer»

If both alkyl GROUPS are aromatic then peoducts are formed by `SN^(1)` mechanism
`SN2` cleavage occurs at a faster rate with HI and than HCl
If both alkyl groups are PRIMARY in polar protic solvent undergoes `SN^(2)` mechanism.
R=primary, `R^(1)` = tertiary, cleavage takes places by `S_(N)1`.

Answer :A
Discussion
16668.

Which type of isomerism is shown by diethyl ether and methyl propyl ether?

Answer»

CHAIN
Functional
Metamerism
Position

ANSWER :C
Discussion
16669.

Which of the following statements are correct for benzoic acid ?

Answer»

NITRATION gives o- and - p- nitrobenzoic ACID
Bromination gives m- BROMO benzoic acid
The FRIEDEL- Crafts reaction with `CH_(3)-underset(O)underset("||")C-Cl//AlCl_(3)` gives m- carboxy acetophenone.
The reaction with oleum gives 3- sulphobenzoic acid

Answer :B::D
Discussion
16670.

The turbidity of a polymer solution measures

Answer»

the light scattered by solution
the light ABSORBED by a solution
the light TRANSMITTED by a solution
None of these

Solution :Molecules of a POLYMER, being large in SIZE, scatter light
Discussion
16671.

Titration of l_(2) produced from 0.1045 g of primary standard KlO_(3) required 30.72 mL of sodium thiosulphate as shown below : lO_(3)^(-) + 5l^(-) + 6H^(+) to 3l_(2) + 3H_(2) Ol_(2) + 2S_(2)O_(3)^(2-) to 2l^(-) + S_(4)O_(6)^(2-) The molarity of sodium thiosulphate ion is :

Answer»

`0.079`
`0.095`
`0.084`
`0.064`

SOLUTION :`{:(lO_(3)^(-) + 5l^(-) + 6H^(+) to 3l_(2) + 3H_(2) O ),(ul(3l_(2) + 6S_(2)O_(3)^(2-) to 6l^(-) + 3S_(4)O_(6)^(2-))),(lO_(3)^(-) + 6S_(2)O_(3)^(2-) + 6H^(+) to L^(-) + 3S_(4)O_(6)^(2-)):}`
Mole of `KlO_(3) -= 6 " moles of " S_(2)O_(3)^(2-)`
Mole of `KlO_(3)= (0.1045)/(21.4) = 4.88 xx 10^(-4)`
Mole `S_(2)O_(3)^(2-) " used " = 4.88 xx 10^(-4) xx 6`
` = 2.93 xx 10^(-3)`
` (M xx 30.72)/1000= 2.93 xx 10^(-3)`
` :. M = 0.095`
Discussion
16672.

White phosphorous is heated with conc. NaOH in inert atmosphere of CO_2 gives

Answer»

`NH_3`
`PCl_(3)`
`PH_(3)`
`PCl_(5)`

Answer :C
Discussion
16673.

The second most common element in the universe is :

Answer»

Silicon
Hydrogen
Nitrogen
Oxygen

Answer :A
Discussion
16674.

Which reaction is not valid

Answer»

`HCL + F_(2) to HF + Cl_(2)`
`HF + Cl_(2) to F_(2) + HCl `
`Zn+ HCl to ZnCl_(2) + H_(2)`
`Al+ HCl to AlCl_(3) + H_(2)`

Solution :Fluorine is more electronegative than chlorine hence, it can displace CL from Icl while chlorine cannot displace fluorine from HF. Therefore the FOLLOWING REACTION is not valid.
`HF + Cl_(2) to F_(2) + HCl`
Discussion
16675.

Which of the following statement are correct about this pair of geometrical isomer?

Answer»

`-I` effect of VINYLIC group on the `-COOH` group is same in both isomers. So there is no role of `-I` on the strength of acidity
`+M` power of vinylic group is operating effectivel in trans isomer (A) but not in cis-isomer (B) because of STERIC repulsion in cis-isomer causing loss of coplanarity of `-COOH` gp. With `C=C` bond . THEREFORE, cis-isomer is more acidec than trans
`+I` power of `CH_(3)-` is greater in trans than cis
None of the above

Solution :N/A
Discussion
16676.

Which ion produces a small crystal field splitting (a weak ligand field) :

Answer»

`I^-`
`CL^-`
`F^-`
All

Answer :D
Discussion
16677.

Which of the following will exhibit maximum ionic conductivity?

Answer»

`K_4[FE(CN)_6]`
`[Co(NH_3)_6]Cl_3`
`[CU(NH_3)_4]Cl_2`
`[NI(CO)_4]`

Answer :A
Discussion
16678.

Write the product when D-glucose reacts with conc. HNO_(3)

Answer»

Solution :D-glucose on reaction with conc. NITRIC acid gives saccharic acid.
`UNDERSET("Saccharic acid ")underset(COOH)underset(|)underset((CHOH)_(4))underset(|)underset(COOH)`
Discussion
16679.

Write two functions of protein.

Answer»


Answer :(a) Fats and OILS act as HEAT insulators and SHOCK absorbers for the organisms.
(b) Fats and oils are the greatest ENERGY reservoirs.
Discussion
16680.

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

Answer»

`I^(-)` USED salt electrolysis
SELF REDUCTION
AQUEOUS solution electrolysis
Thermite REACTION.

Answer :A
Discussion
16681.

Which is the most stable chiral from of this compound ?

Answer»




SOLUTION :Cis01,4-disubstituted compound has a e CONFIGURATION so 'Et' group is PRESENT at 'e' and 'Me' at 'a'
Discussion
16682.

What should be the percentage increase in pressure for a 5% decrease in volume of gas at constant temperature ?

Answer»

SOLUTION :Given, `P_(1)=P, V_(1)=V, T_(1)=T`,
`P_(2) =P_(2), V_(2)=V-(5V)/(100), T_(2)=T`
`P_(1)V_(1)=P_(2)V_(2)`
`rArr PV=P_(2) (V-(5V)/(100))`
`rArr P_(2) =(100)/(95) P=1.0526 P`
`THEREFORE" Increase in P "=0.0526 P`
`therefore %" increase in P "=0.0526xx100=5.26`
Discussion
16683.

Which of the following carbonyl compound is most polar ?

Answer»

`CH_(3) COC_(2)H_(5)`
`CH_(3)COCH_(3)`
`CH_(3)CHO`
`H - CHO`

Answer :D
Discussion
16684.

The thermal dissociation equilibrium of CaCO_(3)(s) is studied under different conditions. CaCO_(3)(s)hArrCaO(s)+CO_(2)(g) For this equilibrium, the correct statement(s) is (are)

Answer»

`DeltaH` is dependent on T
K is INDEPENDENT of the initial amount of `CaCO_(3)`
K is dependent on the pressure of `CO_(2)` at a given T
`DeltaH` is independent of the catalyst, if any

Answer :A::B::D
Discussion
16685.

The well-known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral there are 4Ca^(2+) ions and 8F^(-) ions and that Ca^(2+) ions are arranged in a fce lattice. The F^(-) ions fill all the tetrahedral holes in the face-centred cubic lattice of Ca^(2+) ions. The edge of the unit cell is 5.46 xx 10^(-8) cm in length. The density of the solid is 3.18 g cm^(-3). Use this information to calculate Avogadro's number. [Molar mass of CaF_(2) = 78.08 g mol^(-1)]

Answer»

Solution :The data provided suggests that the number of molecules per UNIT CELL is 4.
`N_(A)=(zxxM)/(a^(3)xxd)`
Here `z=4, M=78.08 " g mol"^(-1), a=5.46xx10^(-8)cm, d=3.18gcm^(-3)`
SUBSTITUTING the values in the above RELATION, we have
`N_(A)=(4xx78.08)/((5.46xx10^(-8))^(3)xx3.18)=(4xx78.08)/((5.46xx10^(-8))^(3)xx3.18)=(4xx78.08)/((5.46)^(3)xx10^(-24)xx3.18)=6.03xx10^(23)`
Discussion
16686.

The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A non-volatile solute weighing 2.175 g is added to 39.0 g of benzene. The vapour pressure of solution 600 mm Hg. What is the molar mass of the solute ?

Answer»

<P>

Solution :`P_(A)^(@)=200" mm Hg, " P_(A)=195 " mm Hg "W_(B)=2g, W_(A)=78 g`
`M_(A)(C_(6)H_(6))=78" g MOL"^(-1)`
ACCORDING to Raoult's Law(solution is ideal or ieal or dilute),
`(P_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`((200-18=95mm))/(195mm)=((2g))/((M_(B)))xx((78" g mool"^(-1)))/((78g))`
`M_(B)=((2g)xx(78" g mol"^(-1)))/((78g))xx((195mm))/((5mm))=78" g mol"^(-1)`.
Discussion
16687.

Thermal decomposition of which compound yeilds a basic and acidic oxide simultaneously:

Answer»

`KClO_3`
`NH_4NO_3`
`CaCO_3`

ANSWER :D
Discussion
16688.

Water rises in a capillary tube to a height of 4.8 cm at 25°C. The density of water at 25°C is 0.9984 g/cc. The same capillary, when filled with mercury, contained 40.5 g/cm of the capillary. Calculate the surface tension of water. Density of Hg = 13.6 g/cc and g = 981 cm s^(-2)

Answer»

Solution : Let US first calculate the radius of the capillary tube (R). Wt. of Hg in the capillary = mass of `Hg xx G`
`w_(Hg) ="Volume" xx "density" xx g`
`w_(Hg) = pir^(2)H xx d xx g`
or `(w_(Hg))/h = pir^(2)dg = 40.5 g//cm`
`therefore r= sqrt((40.5)/((22//7) xx 13.6 xx 981)) = 0.031 cm`
We have,
`Y_(H_(2)O) = (hdrg)/2`
`=(4.8 xx 0.9984 xx 0.031 xx 981)/2`
`=72.86 "DYNE" cm^(-1)`
Discussion
16689.

Which of the following is nylon salt ?

Answer»

`^(-)OOC(CH_2)_4COO^(-)H_3^+N(CH_2)_4N^+H_3`
`^(-)OOC(CH_2)_4COO^(-)H_3N(CH_2)_6NH_3`
`^(-)OOC(CH_2)_6COO^(-)H_3^+N(CH_2)_4N^+H_3`
`^(-)OOC(CH_2)_4COO^(-)H_3^+N(CH_2)_6N^+H_3`

ANSWER :D
Discussion
16690.

Which one is a covalent hydride?

Answer»

`BeH_(2)`
NAH
`CaH_(2)`
None

Answer :A
Discussion
16691.

When diethyl ether is exposed to excess oxygen, the reaction taken place is ………………… .

Answer»

REDUCTION
HYDROGENATION
debydrogenation
AUTO OXIDATION

SOLUTION :auto oxidation
Discussion
16692.

What are non-ideal solutions ? Give two characteristics.

Answer»

Solution :The solutions which do not OBEY Raoult's law, over the entire range of concentration are called non-ideal solution.
(i) There is a charnge in enthalpy when a non-ideal solution formed from their components i.e., `DeltaH_(mix)ne0`.
(II) There is a CHANGE in VOLUME when a non-ideal solution formed from their components i.e., `DeltaV_(MAX)ne0`.
Discussion
16693.

What is the significance of leaching in the extraction of aluminium?

Answer»


Answer :ALUMINIUM IX extracted by the ELECTROLYSIS of pure molten alumina `(Al_2O_3). Pure alumina is obtained from bauxite by LEACHING the ore with concentrated solution of NaOH. Then almina present in bauxite will go into solution as sodium aluminate The insoluble impurities are filtered off. Hydrated alumina is then precipitated by passing `CO_2` through the solution. The precipitate is filtered and STRONGLY heated to form pure alumina.
Discussion
16694.

The reagent used for the conversion of phenol into salicylaldehyde is ………………….. .

Answer»

`CHCl_3//NaOH`
`I_2 //KOH`
`ZN`
`Br_2//C Cl_4`

SOLUTION :`CHCl_3//NaOH`
Discussion
16695.

What are the conditions of pressure and temperature under which solubility of carbon dioxide in water can be increased?

Answer»

SOLUTION :To increase the solibility of carbon DIOXIDE in water HIGH pressure, low TEMPERATURE is FAVOURABLE.
Discussion
16696.

Write the IUPAC name of CH_(3)COCH_(2) CH_(2)CH_(3).

Answer»

SOLUTION :PENTAN - 2 - ONE (or) 2 - PENTANONE
Discussion
16697.

The solublity of I_2 in KI solution is more than its solubility in pure water because

Answer»

`I_2` dissociates in WATER
`I_2` does not REACT with water
`I_2` FORMS SOLUBLE complex `KI_3` with KI
None of these

Answer :C
Discussion
16698.

The speifciassociationof the two chains of the doublehelxin in DNA is known as ……….. .

Answer»

SOLUTION :COMPLEMENTARY BASE PAIRING
Discussion
16699.

Which acts as inhibitor for knocking in combustion of petrol ?

Answer»

`(C_2H_5)_4Pb`
`Ni(CO)_4`
Both (a) and (b)
None

Answer :C
Discussion
16700.

Which of the oxide shows appearence like metallic copper?

Answer»

`ReO_3`
`VO_2`
`TiO_2`
`CrO_2` 

ANSWER :A
Discussion