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12401.

Uranium series is also known as:

Answer»

4N series
4n+ 1 series
4n+ 2 series
4n+ 3 series.

Answer :C
Discussion
12402.

Which of the following compounds is used as the starting material for the preparation of potassium dichromatic?

Answer»

`K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O` (Chronic ALUM)
`PbCrO_(4)` (CHROMITE yellow)
`FeCr_(2)O_(4)` (Chromite)
`PbCrO_(4).PbO` (chromic red)

Solution :POTASSIUM dichromate is prepared from chromite, `FeCr_(2)O_(4)`.
Discussion
12403.

Which of the following is used as an anaesthetic agent?

Answer»

`CH_4`
`CO_2`
`N_2O`
`NO_2`

ANSWER :C
Discussion
12404.

Which of the following statement(s) is (are) true for SO_(2) ?

Answer»

It is a V-shaped MOLECULE
The O-S-O bond ANGLE is `119^(0)30^(1)`
The S-O bond length is 143 pm
It is a linear molecule

Solution :`SO_(2)` is a bent (or) V-shaped molecule.
Discussion
12405.

When aqueous solution of sodium hydroxide is electrolysed ?

Answer»

HYDROGEN is LIBERATED at cathode
Hydrogen is liberated at anode
Sodium is liberated at anode
Hydrogen is not liberated

Answer :A
Discussion
12406.

What is electrochemistry ? Explain its application. OR explain: Electrochemistry is wide and interdisciplinary subject.

Answer»

Solution :Electrochemistry is the study of PRODUCTION of electricity from energy released during the spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations.
Applications: Theoretical and PRACTICAL utilization of electrochemistry is as follows:
(i) Many metals, sodium hydroxide, chlorine, fluorine and many other chemicals are produced by electrochemical methods.
(ii) Batteries and fuel cells convert chemical energy into electrical energy and are used on a large scale in various instruments and devices. the reactions carried out electrochemically are more energy efficient and less polluting.
(iii) Therefore, study of electrochemistry is important for creating new technologies that are ECOFRIENDLY.
(iv) The TRANSMISSION of sensory signals through cells to brain and so vice VERSA and communication between the cells are known to have electrochemical origin.
Electrochemistry, is therefore, a very vast and interdisciplinary subject.
Discussion
12407.

Which of the following used in insomnia ?

Answer»

ANTIOXIDANT
Transquilizers
Antacida
antibiotics

ANSWER :B
Discussion
12408.

Which of the followingside chain reaction/s can be used to reduce the acitivating group such as (-OH) or (-NH_(2)).

Answer»

Benxolation
Acetylaction
Tosylation
Sulphonation

Solution :NA
Discussion
12409.

When molecules of reactant came to each other?

Answer»

KINETIC ENERGY increases
Internal energy will be constant
Internal energy REMAIN constant
Kinetic energy decreases.

Answer :D
Discussion
12410.

When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the negative ions towards the anode, if the cathode is pulled out of the solution:

Answer»

The postive and the NEGATIVE ions both will move towards the ANODE
The positive ions will START moving towards the anode,the negative ions will STOP moving
The negative ions will conuinueto move towards the anode, the positive ions will stop moving
The positive ions and the negative ions will start moving randonly

Answer :D
Discussion
12411.

Which of the following diazonium salts cannot be isolated?

Answer»


`Ph-overset(+)N-=N:CL^(-)`

ANSWER :A
Discussion
12412.

Which of the following is not a bidentate ligand?

Answer»

ETHYLENE diammine
Acetyl acetone
Carbonate
Chloro

Answer :D
Discussion
12413.

When Ethane-1, 2-diol is treated with conc. H_2SO_4it forms …………………. .

Answer»

SOLUTION : 1,4- DIOXANE
Discussion
12414.

Which of the following polymer is of polyamide class ?

Answer»

DACRON
ORLON
NYLON
RAYON

SOLUTION :Nylon
Discussion
12415.

When CuSO_(4) solution is added to K_(4)[Fe(CN)_(6)], the formula of the product formed is

Answer»

`Cu_(2)FE(CN)_(6)`
`KCN`
`Cu(CN)_(3)`
`Cu(CN)_(2)`

Solution :`2CuSO_(4)+K_(4)(Fe(CN)_(6)[rarrCu_(2)[Fe(CN)_(6)]+3K_(2)SO_(4)`
Discussion
12416.

Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?

Answer»

`CH_(3) - overset(O)overset(||)(C) - CH_(3)`
`C_(6) H_(5) CH_(2)`CHO
`C_(6)H_(5)`CHO
`CH_(3) CH_(2) CH_(2) `CHO

Solution :When there are no a -H, Cannizaro reaction takes place and one MOLECULE will get oxidised and other will get reduced and hence
Discussion
12417.

The temperature at which H_2 has same rms speed (at 1 atm)as that of O_2 at NTP is :

Answer»

37 k
17 k
512 k
27 k

Answer :B
Discussion
12418.

The reduction of gt C=O to -CH_2 using hydrazine and NaOEt is known as

Answer»

CLEMMENSEN REDUCTION
Rosenmundreduction
Wolff Kishner reduction
M.P. reduction

SOLUTION :Wolff Kishner REDUCITON.
Discussion
12419.

The two aqueous solutions , A: (AgNO_3) and B : (LiCl) were electrolysed using Pt. Electrodes.The pH of the resulting solutions will

Answer»

<P> increase in A and DECREASE in B
decrease in both
increase in both
decrease in A and increase in B

Solution :aq. ` AgNO_3 OVERSET("ELECTROLYSIS")to 2Ag + (1)/(2) O_2 + 2HNO_3 ` (acid ) So , `P^(H) darr`
` 2LiCl_((aq)) overset("electrolysis")to H_2 + Cl_2 + 2LiOH` (base) So, `P^(H)uarr `
Discussion
12420.

What is the common oxidation state shown by Lanthanoids? Mention any one consequence of Lanthanoid contraction.

Answer»

Solution :`+3` is the common oxidation state shown by lanthannoids.
CONSEQUENCE
i) 4d and 5d SEREIS transaction elements have almost identical size/radii.
ii) `Zr - 4F//M_(0) - W` occur together in NATURE i.e., Due to lanthanoid contraction the ATOMIC radii of `Zr" (160 pm)"` and `"HF (159 pm)"` is almost same so they occur together. Hence it is DIFFICULT to separate them.
Discussion
12421.

Which compound would be obtained as the major product on refluxing 2-chloro-2-methyl butane with alcoholic KOH solution?

Answer»

`(CH_(3))_(2)C=CHCH_(3)`
`CH_(3)-CH=CHCH_(3)`
`CH_(3)=UNDERSET(CH_(3))underset(|)(C)-CH_(2)-CH_(3)`
`(CH_(3))_(2)-underset(OH)underset(|)(C)-CH_(2)-CH_(3)`

SOLUTION :`CH_(3)-underset(CH_(3))underset(|)overset(Cl)overset(|)(C)-CH_(2)-CH_(3)overset("ALC. KOH")rarrCH_(3)-underset(CH_(3))underset(|)(C)=CHCH_(3)`
Discussion
12422.

Which alkaline earth metal is the most abundant in the earth's crust?

Answer»

Mg
Ca
Sr
Ba

Answer :B
Discussion
12423.

Whichof the followingdoes notreactwithnitrous acid ? 1.CH_(3) - NH_(2)""2.(CH_(3))_(3)N 3.C_(2)H_(5) - NH_(2)""4.(CH_(3))_(2)NH 5.(CH_(3))_(3)C-NO_(2)""6. C_(2)H_(5)-NO_(2)

Answer»

2,3
4,5
5,6
2,5

Solution :Tertiarynitroalkaneand tertiaryaminedoesnot REACT withnitrous ACIDS.
Discussion
12424.

Which is the bi-product in Dow process ?

Answer»

Phenoxy BENZENE
Methoxy benzene
Ethoxy benzene
Chlorobenzene

Solution :Phenoxy benzene
Discussion
12425.

Which halide of sulphur undergoes disproportion ation in water?

Answer»

`SCl_(4)`
`SF_(2)`
`S_(2)Cl_(2)`
All the above

SOLUTION :`2S_(2)Cl_(2)+2H_(2)O to 2HCl+SO_(2)+3S`
Discussion
12426.

Which of the following is a aldohexose?

Answer»

glucose
raffinose
cellulose
sucrose

Answer :A
Discussion
12427.

What do you mean by 'Inversion temperature' in different rexampleions of the atmosphere ?

Answer»

Solution :When we go from ONE reaxmpleion of the atmosphere to the next adjoining rexampleion , the trend of TEMPERATURE changes from INCREASE to DECREASE or vice versa. This is called INVERSION temperature.
Discussion
12428.

Which of the following reaction will not give primary amine ?

Answer»

` CH_(3)CONH_(2) overset(Br_(2)//KOH)to`
`CH_(3)CN overset(LiAIH_(4))to`
`CH_(3)NC overset(LiAIH_(4)) to`
` CH_(3)CONH_(2) overset(LiAIH_(4))to`

Answer :C
Discussion
12429.

Three reaction involving H_(2)PO_(4)^(-) are given below : (i) H_(3)PO_(4)+H_(2)O to H_(3)O^(+)+H_(2)PO_(4)^(-) (ii) H_(2)PO_(4)^(-) + H_(2)O to HPO_(4)^(2-) + H_(3)O^(+) (iii) H_(2)PO_(4)^(-)+OH^(-) to H_(3)PO_(4)+O^(2-) In which of the above does H_(2)PO_(4)^(-) act as an acid ?

Answer»

ii only
I and ii
iii only
I only

Solution :
Hence only in (ii) reaction `H_(2)PO_(4)^(-)` is acting as an acid
Discussion
12430.

What are the products obtained from the following reaction? CHCL_3 + O_2 --rarr(^light)

Answer»

HCHO and HCI
HCOCI and HCI
`COCI_2` and HCI
`COCI_2` and HCOCI

Answer :C
Discussion
12431.

Which of the following are lipids ?

Answer»

only OIL
only fatsq
Oils and fats
Sugar

ANSWER :C
Discussion
12432.

Which compound gives the iodoform reaction:

Answer»

formaldehyde
Acetaldehyde
`CH_3OH`
`CH_3COOH`

ANSWER :B
Discussion
12433.

Which of the following is a hypnotic drug?

Answer»

luminal
salol
catcchol
chemisol

Solution :These drugs INDUCE sleep and are habit FORMING common EXAMPLE of hypnotic drugs are Luminal and Saconal.
Discussion
12434.

Which one of the following is names as 3-methyl cyclopentanone ?

Answer»





SOLUTION :
Discussion
12435.

What is ivory black?

Answer»

SOLUTION :The BLACK SUBSTANCE OBTAINED on dissolution of Ca-salts present in BONE charcoal with HCl,
Discussion
12436.

The standard electrode potential for the two electrode A^(+)//A and B^(+)//B are respectively 0.5V and 0.75V. The emf of the given cell A|A^(+)(a=1)||B^(+)(a=1)| B will be

Answer»

1.25V
`-1.25V`
`-0.25V`
`0.25V`

Solution :`A|OVERSET("ANODE")(A^(+)(a=1))||overset("CATHODE")(B^(+)(a=1))|B`
`EMF=E_("cathode")-E_("anode")=0.75-(0.5),EMF=0.25V`
Discussion
12437.

What is an explosive

Answer»

Toluene
R.D.X.
p-Nitrophenol
All of these

Solution :RDX is an EXPLOSIVE.
Discussion
12438.

When ethyl alcohol is reacted with PCl_(5) gives

Answer»

`Cl_(3)CHO`
`C Cl_(3)CHO`
`CH_(3)CH_(2)CL`
`CH_(3)COCH_(3)`

Answer :C
Discussion
12439.

Which has highest paramagnetism:

Answer»

`[CR(H_2O)_6]^(3+)`
`[Fe(H_2O)_6]^(2+)`
`[Cu(H_2O_6]^(2+)`
`[Zn(H_2O)_6]^(2+)`

Answer :B
Discussion
12440.

When an ether is treated with P_2S_5 we get :

Answer»

Thio-alcohols
Thio-ester
Thio-ether
Thio-aldehyde

Answer :C
Discussion
12441.

Which one of the following is/are very important for rusting?

Answer»

OXYGEN
WATER
Both a & b
`H_2O_2`

ANSWER :C
Discussion
12442.

Which oxide of chlorine is most powerful oxidising agent

Answer»

`Cl_2O`
`ClO_2`
`Cl_2O_6`
`Cl_2O_7`

ANSWER :A
Discussion
12443.

Which does not give a precipitate with excess of NaOH?

Answer»

`HgCl_2`
`HgNO_3`
`FeSO_4`
`ZnSO_4`

ANSWER :D
Discussion
12444.

Which of the following is called carborundum?

Answer»

`Be_(4)C`
`CaC_(2)`
`Al_(4)C_(3)`
`SiC`

Solution :`SiC` is CALLED CARBORUNDUM.
Discussion
12445.

When water is converted to ice, its entropy_____.

Answer»


ANSWER :DECREASES
Discussion
12446.

The solvolysis of cinnamyl chloride can be studied spectrophotometrically by observing the decrease in Absorbance of the adsorption maximum at 260 nm. The following observation were made in ethanoic NaOH at 298 k. {:(,"Time (min)",,"0",,"10",,"20"),(,"Absorbance at 260 nm",,0.4,,0.36,,0.324):} Absorbance is directly proportional to the concentration of cinnamyl chloride. [Given: l n 10/9, l n 2.5=0.9, l n 5/3=0.5] The rate constant of reaction is:

Answer»

`0.1 "MIN"^(-1)`
`1.0"min"^(-1)`
`0.01 "min"^(-1)`
`0.023 "min"^(-1)`

ANSWER :C
Discussion
12447.

The solvolysis of cinnamyl chloride can be studied spectrophotometrically by observing the decrease in Absorbance of the adsorption maximum at 260 nm. The following observation were made in ethanoic NaOH at 298 k. {:(,"Time (min)",,"0",,"10",,"20"),(,"Absorbance at 260 nm",,0.4,,0.36,,0.324):} Absorbance is directly proportional to the concentration of cinnamyl chloride. [Given: l n 10/9, l n 2.5=0.9, l n 5/3=0.5] The order of reaction (solvolysis) is:

Answer»

0
1
2
`1/2`

ANSWER :B
Discussion
12448.

Which is polysaccharide:

Answer»

Nylon
Polyethene
Glucose
Cellulose

Answer :D
Discussion
12449.

Whichof the followingcompoundsgivesa primary amineon readuction ?

Answer»

NITROALKANE
Oximes
ALKYL CYANIDES
ALLOF these

Answer :D
Discussion
12450.

The reagents used in the preparation of DDT from chlorobenzene are

Answer»

CHLORAL `(C Cl_(3)CHO)`
Conc. `H_(2)SO_(4)`
`CH_(3)COC Cl_(3)`
`CH_(2) ClCOCH_(2)CL`

Answer :A::B
Discussion