Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

9351.

Which element hast the highest electronegativity

Answer»

C
Mg
O
S

Solution :Because of SMALL SIZE and HIGH NUCLEAR CHARGE.
Discussion
9352.

Which of the following does not conduct electricity ?

Answer»

fused NACL
SOLID NaCl
brine solution
COPPER

Solution :Solid NaCl does not conduct electricity DUE to absence of FREE ions.
Discussion
9353.

When sodium propionate is heated with soda lime, the produce is :

Answer»

Propane
ETHANE
Ethylene
Methane

Solution :`CH_(3) CH_(2)COONa underset(CAO)overset(NAOH)RARR CH_(3)CH_(3)` (Ethane)
Discussion
9354.

Whichof the followingact asstructural backbones ?

Answer»

Keratine , COLLAGEN
Insulin, glucagon
GLYCINE, proline
Alanime , cysteine

Answer :B
Discussion
9355.

Whichenzymeis utilisedin the conversionof galactoseto glucose ?

Answer»

MALTOSE
EPIMERASE
Invertase
Zymase

ANSWER :B
Discussion
9356.

Which of the following compound gives dye test ?

Answer»

ANILINE
Methylamine
Diphenylamine
Ethylamine

Answer :A
Discussion
9357.

Whatisalpha- aminoacid ?Giveitsgeneralstructure.

Answer»

SOLUTION :`ALPHA` - Amino Acid : Theorganic COMPOUNDS in which amino (`-NH_(2)`) group is linked drectly withthe c- atom to whichcarboxylic group `(-COOH)` is ATTACHED .
Discussion
9358.

Total number of species among following which can use any one t_(2g) d-orbital in back bondin. H_(4)SiO_(4), H_(2)NBF_(2), O(SiH_(3))_(2), CCl_(2), N(SiH_(3))_(2), (NB)_(x), R_(3)PO, P_(4)O_(10), CCl_(3)^(-)

Answer»


ANSWER :`6`
Discussion
9359.

Which hydride does not exist ?

Answer»

`SbH_3`
`AsH_3`
`PH_5`
`N_2H_4`

ANSWER :C
Discussion
9360.

Which gives only one monosubstitution product on chlorination?

Answer»

n-pentane
Neopentane
Isopentane
n-butane

Answer :B
Discussion
9361.

Why AI can reduce oxide of Cr but not reduce oxide of Mg and Ca at 800^(@)C?

Answer»

Solution :A METAL can reduce the oxide of metal placed above in the diagram. Due to more negative FREE energy. Such that, `AI` can reduce `CR` but not `Mg` or `CA`.
Discussion
9362.

Which of the following is a free radical substituation reaction ?

Answer»




ANSWER :A
Discussion
9363.

Total number of stereoisomers of truxillic acid are :

Answer»


SOLUTION :
Discussion
9364.

Which of the following is not used as a pigment in paints?

Answer»

LEAD dioxide
White lead
Lead chromate
`Pb_(3)O_(4)`.

Answer :C
Discussion
9365.

Write the formula of paracetamol. What is it used for in medicine ?

Answer»

SOLUTION :
It is USED as ANTIPYRETIC.
Discussion
9366.

Which of one resonating structures of an isocyanide is most stabilizing ?

Answer»

Solution :The STRUCTURE `(R - overset(o+)N-=overset(-) C)` is more STABILIZING as octet of all atoms is complete.
Discussion
9367.

Which of the following statements regarding the molecularity of a reaction is wrong….

Answer»

it is the number of molecules of the REACTANTS taking part in a single step CHEMICAL reaction
it is calculate from the reaction mechanism.
it may be EITHER a whole number or fractional
it DEPENDS on the rate determining step in the reaction

Answer :C
Discussion
9368.

Westrosol is

Answer»

`CHCI=C CI_(2)`
`CHCI_(2)-CHCI_(2)`
`CI_(2)F_(2)`
`CH_(3)NO_(2)`

ANSWER :A
Discussion
9369.

Which of the following is not aromatic

Answer»

BENZENE
Cyclopenyl cation
Trophyliumcation
Cyclopentadienyl cation

Answer :D
Discussion
9370.

What is meant by impurity defect ? Explain with example ?

Answer»

Solution :(i) A method of introducing defects in ionic solids by adding impurity ions.
(ii) If the impurity ions are in DIFFERENT valence state from that of host, vaccancies are created in the crystal lattice of the host.
(iii) For eg., addition of `CdCI_(2)` to silver chloride yields solid solutions where the divalent CATION `Cd^(2+)` occupies the POSITION of `Ag^(+)`
(IV) This will disturb the electrical neutrality of the crystal. In order to maintain the same proportional number of `Ag^(+)` ions leave the lattice. This produces a cation vaccancy in the lattice, such kind of crystal defects are called impurity defects.
Discussion
9371.

Which of the following metals does not react with alcohols and phenols to yield alkoxides/phenoxides?

Answer»

Cobalt
Sodium
Potassium
Aluminium.

Answer :A
Discussion
9372.

What is the effect of increase in pressure on the solubility of a gas in a liquid ?

Answer»

<P>

SOLUTION :Decrease in pressure increases the solubility of a gas in a LIQUID.
OR
At constant temperature, solubility of a gas in a liquid is directly proportional to the pressure of the gas.
OR
PARTIAL Pressure of a gas in vapour phase is directly proportional to mole fraction of the gas in solution.
P = `K_(H)`x.
Discussion
9373.

Which of the following reaction involves rearrangement process?

Answer»




ANSWER :A
Discussion
9374.

What do you mean by zwitter ion?

Answer»

Solution :Due to the presence of an acidic and a basic group in the same molecule, AMINO acids exist in an ionic form called a ZWITTER ion where the proton of -COOH group is TRANSFERRED to the -`NH_(2)`group.
`R-OVERSET(NH_(2))overset(|)underset("Amino acid")(CH)-COOHrarrR-overset(+)overset(NH_(3))overset(|)underset("Zwitter ion")(CH)-COO^(-)`
Discussion
9375.

Write reactions of the final alkylation product of aniline with excess methyl iodide in the presence of sodium carbonate solution.

Answer»

SOLUTION :
Discussion
9376.

Which of the following compound is formed when formaldehyde is treated with Ca(OH)_(2) ?

Answer»

METHANOL
FORMOSE
Formic acid
CALCIUM FORMATE

Answer :B
Discussion
9377.

Which of the following parameter would be same for ethanol and methoxymethane ?

Answer»

BOILING points
VAPOUR pressure at the same TEMPERATURE
Heat of VAPORIZATION
Haseous densities at the same temperature and pressure .

Answer :D
Discussion
9378.

What is primary battery ? Give note on primary battery. OR Give note on dry cell.

Answer»

Solution :* The most familiar example of primary cell is dry cell is also known as Leclanche cell after its discoveres. In the primary batteries, the reaction time battery becomes dead and cannot be reused again. This is known as primary battery.
* Uses: Dry cell is used commonly in our transistors, toys and clocks.
* Dry cell construction :

* Anode : The cell consists of a zinc container that also ACTS as anode. externally, such container possess a thin layer of non-conductor paper.
* Cathode : The cathode is a carbon (graphite) rod, which is kept vertically in Zn cylinder.
* Electrolyte : A carbon (graphite) rod surrounded by powdered manganese dioxide and carbon. the space between the electrodes is filled by a moist paste of ammonium chloride `(NH_(4)Cl)` and zinc chloride `(ZnCl_(2))`. whole vessel is sealed with special type of wax.
* Reactions of dry cells:
* Oxidation of Zn is carried out near anode:
`Zn_((S)) to Zn^(2+) +2E^(-)`
* Reduction of `Mn^(4+)` of `MnO_(2)` in `Mn^(3+)(Mn^(3+)OOH)` is carried out near cathode:
`underset(+4)(MnO_(2))+NH_(4)^(+)+e^(-) to underset(+3)(MnO)(OH)+NH_(3)`
* `Zn^(2+)` IONS produced during reaction will make COMPLEX with `NH_(3)` and get converted into `[Zn(NH_(3))_(4)]^(2+)`.
So over all reaction : `Zn_((S))+2MnO_(2)+2NH_(4)^(+) to Zn^(2+)+2MnO(OH)+2NH_(3)`
* Cell potential : Cell potential of this cell is 1.5 V and we can obtain 3.0 V and 4.5 V cell potential when two or three cells are attached in series.
Discussion
9379.

Write the IUPAC names of the following coordination compounds : K_(3)[Fe(CN)_(6)]

Answer»

SOLUTION :POTASSIUM HEXACYANOFERRATE(III)
Discussion
9380.

x' grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. what is the value of 'x' in grams?

Answer»

`44`
`200`
`150`
`50`

Solution :`UNDERSET(=100g)underset(1mol)(CaCO_(3))overset(DELTA)(to)underset(=56g)underset(=40+16)underset(1mol)(CAO)+CO_(2)`
To PRODUCE 56 g of RESIDUE (CaO),`CaCO_(3)` needed = 100 g
`:.` To produce 28 g of redue, `CaCO_(3)` needed
`=(100)/(56)xx28=50g`
Discussion
9381.

Which of the following is/are correct statement(s)?

Answer»

Gram ATOMIC mass of an element inay be defined as the mass of Avogadro's NUMBER of atoms.
The molecular mass of a diatomic elementary gas is TWICE its atomic mass.
Gay Lussac's law of chemical combination is valid for all substances.
A pure compound has always a fixed proportion of masses of its constituents.

Solution :Gay Lussa.c law is TRUE only for gaseous substances.
Discussion
9382.

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

Answer»

(III) only
(i) only
(ii) only
(i) and(ii).

Solution :(ii) `H_(2)PO_(4)^(-)` because it loses a PROTON and therefore, it is a BRONSTED acid.
Discussion
9383.

Which of the following molecule is theoretically not possible ?

Answer»

`SF_(4)`
`OF_(2)`
`OF_(4)`
`O_(2)F_(2)`

Answer :C
Discussion
9384.

Which of the following hydrocarbon is formed when electric discharge is passed between graphite electrodes in an atmosphere of hydrogen?

Answer»

`CH_4`
`C_2 H_6`
`C_2 H_4`
`C_2 H_2`

ANSWER :D
Discussion
9385.

Which of the following undergoes nucleophilic substitution exclusively byS_(N^(1)) mechanism ?

Answer»

BENZYL CHLORIDE
Ethyl chloride
Chlorobenzene
ISOPROPYL chloride,

ANSWER :A
Discussion
9386.

Which of the following are pseudohalide ions ?

Answer»

`CNO^(-)`
`OCN^(-)`
`RCOO^(-)`
`N_(3)^(-)`

Solution :The ions consisting of TWO ( or ) more electronegative ATOMS of which atleast ONE is nitrogen, that have properties similar to those halide ions are called pseudo halide ION.
Discussion
9387.

Which acid is completely ionised in aqueous solution :

Answer»

`CH_3CH_2COOH`
`CHCl_2COOH`
`CICH_2COOH`
`CCI_3COOH`

ANSWER :D
Discussion
9388.

What will be the normality of 500 mL solution of 0.5 M Na_(2)SO_(4) when diluted to 5 litre volume by addition of water ?

Answer»

0.1 N
0.01 N
10 N
1 N

ANSWER :A
Discussion
9389.

Write the structures and names of all the stereoisomers of the following compounds: [Fe(NH_(3))_(4)Cl_(2)]Cl

Answer»

Solution : `[FE(NH_(3))_(4)Cl_(2)]Cl`

Tetraamminedichloridoiron(III) CHLORIDE
Discussion
9390.

Which of the following is most basic?

Answer»

`AL(OH)_(3)`
`CR(OH)_(3)`
`LA(OH)_(3)`
`Fe(OH)_(3)`

ANSWER :C
Discussion
9391.

Water can be tested by

Answer»

hydrated `CuSO_(4)`
TASTE
SMELL
ANHYDROUS `CoCl_3` (blue) which changes to pink.

Solution :`underset("(Blue)")(CoCl_(3))+6H_(2)Orarr underset("(Pink)")(CoCl_(3)).6H_(2)O`
Discussion
9392.

The vitamin which is water soluble and antioxidant is :

Answer»

VITAMIN `E`
Vitamin `D`
Vitamin `C`
Vitamin `B_1`

ANSWER :C
Discussion
9393.

Which statement is/are incorrect ?

Answer»

In alkali METALS in a group, from top to bottom increase in size is maximum from Na to K
Addition of `e^(-)` in P ATOM will be exothermic
IP of F is greater than its EA value
Reaction `O_((g))^(-) +S_((g)) to O_((g)) +S_((g))^(-) ` is endothermic

Answer :D
Discussion
9394.

The values of Delta H and Delta Sof a certain reaction are- 400 kJ "mol"^(-1) and -20 kJ "mol"^(-1)K^(-1)respectively. The temperature below which the reaction spontaneous is

Answer»

100K
`20^@C`
`20K`
`120^@C`

SOLUTION :`Delta G = Delta H - T Delta S`
Now for a reaction to be spontaneous , `Delta G lt 0`
` therefore Delta H - T Delta S lt 0`
` rArr - 400 - T ( -20) lt 0 rArr - 400 + 20 T lt 0`
` therefore 20T lt 400 rArr T lt 20K`
Discussion
9395.

Yellow phosphorus is kept in:

Answer»

Water
Ether
Alcohol
Kerosene

Answer :A
Discussion
9396.

Which of the following is not an organonetallic compound ?

Answer»

`C_(2)H_(5)ONa`
`(C_(2)H_(5))_(3)Pb`
`(CH_(3))_(3)Al`
`CH_(3)MgBr`

Solution :We KNOW that ,SODIUM ethoxie `(C_(2)H_(5)ONa)` is the compound in which metal atom is not directly linked in which metal atom is not directly linked to carbon atom. Thereforeit is not an organiometallic compound.
Discussion
9397.

What is the importance of amino acids to us ?

Answer»

Solution :They are the BUILDING blocks of PROTEINS which are essential for the GROWTH and MAINTENANCE of life.
Discussion
9398.

What type of collodisl sols are formed in the following ? (i) Sulphur vapours are passed through cooled water. (ii) White of an egg is mixed with water. (iii) Soap solution.

Answer»

Solution :(i) Multimolecular because sulphur MOLECULES associate together to from colloidal SOL.
(ii) Macromolecular because protein molecules present in the WHITE of the egg are macromolecules soluble in water.
(III) Associated because `RCOO^(-)` ions associated together to from MICELLES.
Discussion
9399.

Which of the set of oxides are arranged in the proper order of basic, amphoteric, acidic?

Answer»

`SO_2, P_2O_5, CO`
`BAO, Al_2O_3, SO_2`
`CaO, SiO_2, Al_2O_3`
`CO_2, Al_2O_3, CO`

Solution :`BaO to ` BASIC
`Al_2O_3 to` AMPHOTERIC
`SO_(2) to` Acidic .
Discussion
9400.

Which of the following is/are soluble in excess of NaOH,(X) Pb(OH)_(2)(Y), CuS,(Z),Al(OH)_(3)

Answer»

X
Y
Z
None of these

Answer :B,C
Discussion