94420 + Interview Questions in Chemistry in Class 12

1.	Low melting metals likelead in tin are refined by .............. .
Answer» ANSWER :LIQUATION

Discussion

2.	Low melting point is expected for a solid :
Answer» Ionic solid Metallic solid Molecular solid Covalent solid Solution :Among GIVEN solid, molecular solid is weak, HENCE, it has LOW melting point.

Discussion

3.	Low level of noradrenaline is the cause of depression. What types of drugs are needed to cure this problem ? Name two drugs.
Answer» Solution :When the level of NEUROTRANSMITTER, noradrenaline becomes low, antidepressant drugs are required. These drugs inhibit the ENZYMES which catalyse the degradation of noradrenaline. If the enzyme is INHIBITED, noradrenaline is SLOWLY metabolised and hence activates its receptor for longer periods of time thereby reducing depression. Two IMPORTANT drugs are iproniazid and phenelzine (nardil).

Discussion

4.	Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem ? Nume two drugs.
Answer» Solution : In event of LOW level of NEUROTRANSMITTER, NORADRENALINE, antidepressant drugs are required. These drugs inhibit the enzymes which CATALYSE the degradation of noradrenaline. If the enzyme is INHIBITED. noradrenaline is slowly metabolized and hence activates its receptor for longer periods of time thereby reducing depression. Two important drugs are iproniazid and phenelzine (nardil).

Discussion

5.	Low level of noradrenaline is the cause of depression. What type of drugs are neededto cure this problem ? Name two drugs.
Answer» SOLUTION : In EVENT of low level of neurotransmitter, noradrenaline, ANTIDEPRESSANT drugs are required. These drugs inhibit the enzymes which catalyse the degradation of noradrenaline. If the ENZYME is inhibited. noradrenaline is slowly metabolized and hence activates its receptor for longer periods of time thereby reducing depression. Two important drugs are iproniazid and phenelzine (nardil).

Discussion

6.	Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem ? Name two drugs.
Answer» SOLUTION :Antidepressent DRUGS - IPRONIAZID, PHENELZINE (NARDIL).

Discussion

7.	Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem.Name two drugs.
Answer» SOLUTION :Noradrenaline INDUCES a feeling of well being and helps in changing the mood. If the level of noradrenaline is low, then the signal sending activity of the hormone become low and the person suffers from depression. In such cases, the PATIENT NEEDS anti-depression drugs which INHIBIT the enzymes which catalyse the degradation of noradrenaline. The common drugs used as anti-depression are iproniazid and phenelzine.

Discussion

8.	Low density polythene (LDP) is used in the insulation of electricity carrying wires and manufacture of flexible pipes and squeeze bottles because
Answer» it is tough , hard and rigid it is chemically INERT , tough , FLEXIBLE and poor conductor of ELECTRICITY it is very tough , good conductor of electricity and flexible it is chemically inert , very SOFT , water absorbent and poor conductor of HEAT . Answer :B

Discussion

9.	Low density polytheneand high densitypolythene , both are polymers of ethene but there is marked differencein theirproperties . Explain.
Answer» Solution :Low densityand high densitypolythenes are obtained under differentconditions. There differe in theirstructuralfeatures. Low DENISTY polythere are highly branchedstructures while high densitypolythene consits of closely packedlinearmolecules . CLOSE packingincreasethe DENSITY .

Discussion

10.	Low density polythene and high density polythene, both are polymers of ethene but there is marked difference in their properties. Explain.
Answer» SOLUTION :Low density polythenes and high density polythenes are obtained under different conditions and they are differ in their STRUCTURAL features. Low density polythenes are highly branched STRUCTURES while high density polythenes consists of CLOSELY PACKED linear molecules.

Discussion

11.	Low density polyethylene is
Answer» CROSS linked polymer BRANCHED polymer LINEAR polymer CONDENSATION polymer Answer :B

Discussion

12.	Low conecentration of phenol is used as
Answer» DISINFECTANT anatiseptic antioxidant analgesic and antipyretic Answer :B

Discussion

13.	Low content of oxygen than expected is found in
Answer» peroxide superoxide suboxide mixed oxide Answer :C

Discussion

14.	Low concentration of oxygen in the blood and tissues of people living at high altitutes is due to _____
Answer» LOW TEMPERATURE. low ATMOSPHERIC PRESSURE. HIGH atmospheric pressure. both low temperature and high atmospheric pressure. Solution :low atmospheric pressure.

Discussion

15.	Low concentration of oxygen in the blood and tissues of people living at high altitude is due to …………….. .
Answer» LOW temperature low atmospheric PRESSURE high atmospheric pressure both now temperature and high atmospheric pressure. Solution :BODY temperature of the human body remains constant. Low CONCENTRATION of oxygen in the BLOOD at altitude is due to low atmospheric pressure.

Discussion

16.	Low concentration of oxygen in the blood and tissues of people living at high altitude is due to ……..
Answer» Low temperature Low ATMOSPHERIC pressure High atmospheric pressure Both low temperature and high atmospheric pressure SOLUTION :Explanation : At high altitude the atmospheric PRESURE is decreased &, DUE to low atmospheric pressure the solubiliy of OXYGEN in blood and tissues is reduced.

Discussion

17.	Low concentration of oxygen in the blood ndtissues of people living at high altitude is due to…….
Answer» low temprature low atmospheric pressure HIGH atmospheric pressure both low TEMPERATURE and high atmospheric pressure. Solution :is the correct answer. The SOLUBILITY of EXYGEN (gas) in blood in influenced by the atmoshpgeric pressure according to Henry's by the atmospheric pressure according to Henry's Law. Body temperaure of human BEINGS is not influnced by altitude.

Discussion

18.	Lother Meyer plotted a graph showing the variation of
Answer» atomic MASS with increase in atomic number atomic VOLUME with increase in atomic mass atomic volume with increase in atomic number atomic PROPERTY such as atomic RADII with increase in atomic mass. Answer :A

Discussion

19.	Loss of a beta particles is equivalent to
Answer» Increase of one neutron only DECREASE of one neutron only Both (a) and(b) None of these Solution :LOSS of beta PARTICLE is EQUIVALENT to decrease of one neutron only `N rarr p + e^(-) + bar(v)`

Discussion

20.	Loss of beta-particles is equivalent to
Answer» Increase of ONE proton only Decrease of one neutron only Both (A) and (B) None of these Solution :`._(0)n^(1) RARR ._(1)P^(1)+._(-1)E^(0)` so loss of 1 `BETA` particle is equivalent to decrease of one neutron or increase of one proton.

Discussion

21.	Loss of a beta-"particle" is equivalent to:
Answer» INCREASE of ONE proton only decrease of one NEUTRON only both A and B None of the above Answer :C

Discussion

22.	Loschmidt number is the number of -
Answer» Atoms present in 1 gram mole of a GAS at STP Atoms present in 1 ML of a gas at STP Molecules present in 1 gram mole of a gas at STP Molecules present in 1 mL of a gas at STP Answer :D

Discussion

23.	Loschmidt number is the number of:
Answer» MOLECULES present in 1 ML of a gas at STP molecules present in 1 gram MOLE of a gas at STP atoms present in 1ML of a gas at STP atoms present in 1 gram mole of a gas at STP Answer :A

Discussion

24.	Look at the following diagram and answer the questions given below : Write the overall reaction taking place in the extraction of metal.
Answer» Solution :`2Al_(2)O_(3)+3C to 4Al+ 3CO_(2)`

Discussion

25.	Look at the following diagram and answer the questions given below : What is this process of extraction of Al known as ?
Answer» SOLUTION :The PROCESS is KNOWN aselectrolytic REDUCTION.

Discussion

26.	Look at the following diagram and answer the questions given below : What is the function of Na_(3)AlF_(4) ?
Answer» SOLUTION :The function of ADDING `Na_(3)AlF_(4)` is to lower the melting point and to increase CONDUCTIVITY.

Discussion

27.	Longest mean free path under similar conditions of P and T stands for :
Answer» `N_2` `O_2` `H_2` `Cl_2` ANSWER :C

Discussion

28.	Long chain carboxylic acids are called fatty acids because:
Answer» The molecule is very FATTY The molecules were FIRST found in natural FAT They have flattering effect None Answer :B

Discussion

29.	London somg is called _______smog.
Answer» ANSWER :A::C

Discussion

30.	Log P vs log V curve is plottedfor anideal gas, which is true for the gas ?
Answer» MONOATOMIC & undergoing adiabitc chagre MONATOMIC& undergoing an isothermal change Diamtomic & undergoing an adiabitccharge Triatomic & undergoingan isothermal change Solution :Equation of PROCESSE `(log P-2.38)/(log V-1.10)=(2.10-2.38)/(1.30- 1.10)=(-0.28)/(0.20)=(-7)/(5)` `rArr(log P-2.38)xx5= -7 (log V-1.1)` `rArr5 log P + 7 log V=19.60` `rArrlog P^(5) + logV^(7) = 19.60 ` `P_(5)V_(7)` = antilog (19.60) = constant or `PV^(1.4)` = constant `therefore gamma = 1.4 - "diatomic&adiabatic"`

Discussion

31.	Lodstone used by ancient mariners to find the direction is
Answer» `Fe_(2)O_(3)` `Fe_(3)O_(3)` FE `FeS_(2)` ANSWER :2

Discussion

32.	lodine is liberated in the reactions between KI and Cu^(2+), but chlorine is not liberated when KCI is added to Cu^(2+), why?
Answer» SOLUTION :IODIDE is a STRONG reducing agent. Though `Cu^(2+)` is a mild oxidising agent, iodide reduces `Cu^(2+)` to `Cu^(+)` ion. Chloride is a weak reducing agent. It does not reduce `Cu^(2+)` ion. `2CU^(2+)+4KIrarr Cu_(2)I_(2)+I_(2)+4K^(+)`

Discussion

33.	Lock-Key' fit theory is for
Answer» HOMOGENEOUS catalysis Heterogeneous catalysis Enzyme ACTION NONE of these Answer :C

Discussion

34.	'Lock-key' fit theory is for
Answer» HOMOGENEOUS CATALYSIS heterogenous catalysis enzyme ACTION none of these Answer :C

Discussion

35.	Ln^(3+) ions are
Answer» reducing AGENT OXIDISING agent either NEITHER ANSWER :A

Discussion

36.	Ln^(2+) ions one used as
Answer» oxidising agent reducing agent EITHER NEITHER ANSWER :B

Discussion

37.	Ln^(3+) contain
Answer» 1 to 6 4-f unpaired ELECTRONS 1 to 5 4-f unpaired electrons 1 to 7 4-f unpaired electrons all of these Solution :`LN^(3+)` ion has electronic congiguration `6S^(2), 4F^(1-14), 5d^(0-1)` containing 1 to 7 4f unpaired electrons.

Discussion

38.	ln the metallurgy of Zn, Zn dust obtained from roasting and reduction of zinc suI ph ide contains some ZnO. It is removed by
Answer» absorbance of ultraviolet light- and reemission of white light shock cooling by CONTACT with a SHOWER of MOLTEN lead. X-raymethod smelting. Answer :D

Discussion

39.	Ln ^(4+) ions are used as
Answer» OXIDISING agent reducing agent either neither ANSWER :A

Discussion

40.	LN ^(3+) has electronic configuration
Answer» `6s^(0), 4F^(1"to"14) 5D^(0)` `6s^(2), 4f^(1"to"14), 5d^(0)` `6s^(0), 4f^(1"to"14), 5d^(1)` `6s^(1), 4f^(1"to"14), 5d^(1)` ANSWER :A

Discussion

41.	Lithopone is a mixture of:
Answer» BARIUM SULPHATE and ZINC SULPHIDE Barium sulphide and zinc sulphide Calcium sulphate and zinc sulphide Calcium sulphide and zinc sulphide Answer :A

Discussion

42.	Lithopone is a mixture of
Answer» `ZnSO_4,BaSO_4` `ZNS,BaSO_4` `ZnCO_3,BaCO_3` `ZnS,NA,SO_4` SOLUTION :`Zns + BasO_4`

Discussion

43.	Lithopone is
Answer» `BaO+ZnSO_(4)` `ZnO+BaSO_(4)` `BaS+ZnSO_(4)` `ZNS+BaSO_(4)` Solution :`ZnS +BaSO_(4) ` is lithopone USED as WHITE pigments

Discussion

44.	Lithopone, a white pigment, consists of
Answer» `ZnS and BaSO_4` `PbS and MGO` `Al_2O_3 and CaCO_3` `BaSO_4 and PbSO_4` SOLUTION :LITHOPONE is `(ZnS + BaSO_4)`. It is used as a FILLER in RUBBER and paper industry.

Discussion

45.	Lithopone , a white pigment , consists of :
Answer» `Al_2O_3` and `CaCO_3` BAS and `PbSO_4` ZNS and `BaSO_4` PBS andMgo ANSWER :C

Discussion

46.	Lithium tetrahydridoaluminate is correctly represented as:
Answer» `AI[LiH_4]` `AI[LiH_4]_3` `Li[AIH_4]` `Li[AIH_4]_2` Answer :C

Discussion

47.	Lithium shows diagonal relationship with :
Answer» Mg Hg Mg and Hg None of these Answer :A

Discussion

48.	Lithium show diagonal relationship with ?
Answer» Magnesium Beryllium Aluminium Boron Answer :A

Discussion

49.	Lithium only forms monoxide when heated in oxygen. Sodium forms monoxide and peroxide in excess of oxygen. Other alkali metals form superoxide metals superoxide with oxygen i.e., MO_(2). The abnormal behaviour of lithium is due to small size. The larger size of higher metals also decides the role in formation of superoxide. All the three anions abstract proton from water. The three anions are raleted to each other as follows: underset("oxide ion")(O_(2)^(2-)overset((1)/(2)O_(2))(to)underset("peroxide ion")(O_(2)^(2-))overset(O_(2))(to)underset("superoxide ion")(2O_(2)^(-)) Q. Which anion is stable towards water:
Answer» `O^(2-)` `O_(2)^(2-)` `O_(2)^(-)` NONE of these Solution :All the three `O^(2-), O_(2)^(2-) and O_(2)^(-)` are unstable in presence of WATER and abstract PROTON from water.

Discussion

50.	Thermal decomposition of (NH_4)_2BeF_4 gives :-
Answer» SOLUTION :

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Low melting metals likelead in tin are refined by .............. .

Low melting point is expected for a solid :

Low level of noradrenaline is the cause of depression. What types of drugs are needed to cure this problem ? Name two drugs.

Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem ? Nume two drugs.

Low level of noradrenaline is the cause of depression. What type of drugs are neededto cure this problem ? Name two drugs.

Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem ? Name two drugs.

Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem.Name two drugs.

Low density polythene (LDP) is used in the insulation of electricity carrying wires and manufacture of flexible pipes and squeeze bottles because

Low density polytheneand high densitypolythene , both are polymers of ethene but there is marked differencein theirproperties . Explain.

Low density polythene and high density polythene, both are polymers of ethene but there is marked difference in their properties. Explain.

Low density polyethylene is

Low conecentration of phenol is used as

Low content of oxygen than expected is found in

Low concentration of oxygen in the blood and tissues of people living at high altitutes is due to _____

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to …………….. .

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to ……..

Low concentration of oxygen in the blood ndtissues of people living at high altitude is due to…….

Lother Meyer plotted a graph showing the variation of

Loss of a beta particles is equivalent to

Loss of beta-particles is equivalent to

Loss of a beta-"particle" is equivalent to:

Loschmidt number is the number of -

Loschmidt number is the number of:

Look at the following diagram and answer the questions given below : Write the overall reaction taking place in the extraction of metal.

Look at the following diagram and answer the questions given below : What is this process of extraction of Al known as ?

Look at the following diagram and answer the questions given below : What is the function of Na_(3)AlF_(4) ?

Longest mean free path under similar conditions of P and T stands for :

Long chain carboxylic acids are called fatty acids because:

London somg is called _______smog.

Log P vs log V curve is plottedfor anideal gas, which is true for the gas ?

Lodstone used by ancient mariners to find the direction is

lodine is liberated in the reactions between KI and Cu^(2+), but chlorine is not liberated when KCI is added to Cu^(2+), why?

Lock-Key' fit theory is for

'Lock-key' fit theory is for

Ln^(3+) ions are

Ln^(2+) ions one used as

Ln^(3+) contain

ln the metallurgy of Zn, Zn dust obtained from roasting and reduction of zinc suI ph ide contains some ZnO. It is removed by

Ln ^(4+) ions are used as

LN ^(3+) has electronic configuration

Lithopone is a mixture of:

Lithopone is a mixture of

Lithopone is

Lithopone, a white pigment, consists of

Lithopone , a white pigment , consists of :

Lithium tetrahydridoaluminate is correctly represented as:

Lithium shows diagonal relationship with :

Lithium show diagonal relationship with ?

Thermal decomposition of (NH_4)_2BeF_4 gives :-