Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.	Iodine deficiency in diet causes:
Answer» Beri-beri Goiter Rickets Night blindness Answer :B

2.	It is true that under certain coditions magnesium can reduce SiO_2 and silicon can reduce MgO. What are those conditions ?
Answer» Solution :Below 1623 K (or `1350^@C`), magnesium can reduce `SiO_2` but above 1623 K (or `1350^@C`), silicon can reduce `MgO`. This can be infrred from `DELTAG^@` vs T plots.

3.	Iodine deficiency in diet causes :
Answer» GOITRE rickets beri-beri night blindness. Answer :A

4.	It is used as food preservative
Answer» SODIUM benzoate ammonium benzoate benzoic acid formic acid Answer :A

5.	Iodine can exist in the oxidation states :
Answer» `-1, +1, +3, +5` `-1, +1, +3` `+3, +5, +7` `-1,+1,+3,+5, +7`. ANSWER :A

6.	It is said Taj Mahal may be destroyed due to
Answer» Flood in Yamuna river Decomposition of marble as a RESULT of high temperature Air pollutants released from OIL refinery of Mathura All the above Solution :YELLOWING and blackening of Taj Mahal at Agra is due to `SO_2` and other pollutants released by Mathura refinery

7.	Iodine crystals are:
Answer» METALLIC solid Ionic solid Molecular solid Covalent solid Answer :C

8.	It is recommended that ammonia bottles be opened after cooling in ice for sometime. This is because
Answer» It BRINGS tears to eyes It has HIGH vapour pressure It is corrosive liquid It is mild explosive Answer :B

9.	It is safe to inject solutions isotonic with blood plasma intravenously. Explain.
Answer» SOLUTION :THISIS becausein this casenoosmosisoccurshenceneitherRBCswellnortheyshrink.

10.	Iodine can be obtained from Nal solution by the action of:
Answer» `CI_2` `Br_2` `F_2` All Answer :D

11.	Iodine can be liberated as a result of :
Answer» OXIDISING `Cl_(2)` by `I_(2)` oxidising `I^(-)` by `CL^(-)` oxidising `I^(-)` by `Cl_(2)`. none Answer :D

12.	It is practically difficult to calculate the equivalent conductivity of a weak electrolyte in aqueous solution. Comment.
Answer» Solution :Equivalent conductance = `(k xx 1000)//"normality"`. The extent of dissociation of a weak is less. According the number of IONS FURNISHED in AQUEOUS solutions is less. The specific conductivity (k) of a weak electrolyte is in the order of `10^(-2) S m^(-1)` or less. Since k is less, it is difficult to calculate equivalent conductivity of a weak electrolyte.

13.	Iodine and sulphur dissolve in
Answer» WATCH ben/cnc CARBON DISULPHIDE cthanol SOLUTION :carbon disulphide

14.	Iodine and hypo react to produce:
Answer» `Na_2S` `Na_2SO_3` `Na_2SO_4` `Na_2S_4O_6` ANSWER :D

15.	Iodination of benzene require
Answer» HGO `HNO_(3)` `HIO_(3)` ONE of the obove Answer :D

16.	It is possible to obtain oxygen from air by fractional distiilation because
Answer» oxygen is in a different group of the periodic table from nitrogen oxygen is more reactive than nitrogen oxygen has higher b.p. than nitrogen oxygen has a lower DENSITY than nitrogen Solution :AIR is liquified by making use of the joule-Thomson effect (cooling by expansion oflhe GAS). WATER vapour and `CO_(2)` areremoved by solidification. The remaining constitucents of liquid air i.e., liquid oxygen and liquid nitrogen are separated by means of FRACTIONAL distillation (b.p. of `O_(2)= - 183^(@)C : b.P. " of" N_(2)= -195.8^(@)C`)

17.	Iodination of alkane is made in presence of:
Answer» `KMnO_4` HGO and `HIO_3` `K_2Cr_2O_7` NONE of these Answer :D

18.	It ispossible to get pure benzoicacid from a sample containing impurities of naphthalene through the process of recrystallisation using benzene as a solvent? Give reason-
Answer» Solution :It is not possible to purify impure benzoic acid by recrystallisation using BENZENE as SOLVENT because both naphthanlene and benzoic acid are quite SOLUBLE in benzene. PURIFICATION is however possible if HOT water be used as the solvent because acid is soluble in hot water but naphthalene is not.

19.	Iodides of alkanes can be conveniently prepared by treating the chloro or bromo-derivative with sodium iodide in acetone. The reaction is known as :
Answer» FINKELSTEIN REACTION Frankland reaction FITTING reaction KOLBE's reaction ANSWER :A

20.	It is possible to obtain oxygen from air by fractional distillation because:
Answer» Oxygen is in different group of PERIODIC table from nitrogen Oxygen is more ACTIVE than nitrogen Oxygen has HIGHER BOILING point than nitrogen Oxygen has lower density than nitrogen Answer :C

21.	Iodimetric titrations are usually performed in neutralor mildly alkaline (pH = 8) or weakly acidic solutions. Which statement is not valid for this observation ?
Answer» In strong alkaline SOLUTION, `I_2` disproportionate to `I^(-) and IO^(-)` In strong acidic SOLUTIONS , starch used to detect the end point tends to hydrolyse or decompose `I^-` produced during titration tends to be oxidized by dissolved oxygen in acidic medium REDUCING POWER of reducing agent is increased in strong acidic medium ANSWER :D

22.	It is often difficult to store radioactive isotopes of Kr and Xe. Suggest a method to store them.
Answer» Solution :During nuclear reactions, radioactive isotopes of Kr and Xe are produced which find large number of applications in medicine and INDUSTRY. For this purpose, these radioactive isotopes must be stored. A USEFUL METHOD to store them is to MAKE their hydrates by compressing them in WATER. The hydrates thus formed are stable and are kept at low temperatures and used as and when required.

23.	Iodiantion of alkanes is carried out in the presence of :
Answer» carbon TETRACHLORIDE an oxidising AGENT a REDUCING agent excess air ANSWER :B

24.	Iodide of Million's base is:
Answer» `K_2[HgI_4]` `Hg_2OcdotNH_2OH]cdotH_2O` `HG(NH_2)I+Hg` ANSWER :B

25.	It is observed that only 0.39% of the original radioactive sample remains undecayed after eight hours.Hence:
Answer» the half-life of that substance is 1 hour the mean life of the substance is `(1)/(LN 2)` hour decay constant of the substance is (ln2) `"hour"^-1` if the NUMBER of radioactive nuclei of this substance at a given instant is `10^8` then the number LEFT after 30 min would be `sqrt2 xx 10^(9)` SOLUTION :(or) `((0.693)/(tau_(1//2))) xx 8 = 2 .303 log ((100)/(0.39)) , ((0.693)/(tau_(1//2))) xx 8 = 2.303 log ((100 xx 100)/(39))` `tau_(1//2) = (0.693 xx 8)/(2.303 xx 2.4089) -= 1 , tau_(1//2) = 1 , lambda = 0.693 = I_(n) 2 , tau = (1)/(lambda) = (1)/(0.693) = (1)/(I_(n) 2)` `(2.303 log 2) xx (1)/(2) = 2 .303 log ((10^(8))/(N_(t))) , (t)/(2) log 2 = log ((10^(8))/(N_(t))) log (2)^(t//2) = log "" (10^8)/(N_t) , (10^8)/(N_t) = sqrt2 implies N_t = (1)/(sqrt2) 10^8`

26.	Iodex contains
Answer» METHYL acetate ethyl propionate methyl salicylate methyl benzoate Answer :A::C

27.	It is observed that H_(2) and He gases always show positive deviation from ideal behaviour i.e ., Zgtl. This is because
Answer» the value of 'a' is very large due to HIGH ATTRACTIVE FORCES the weak intermolecular forces of ATTRACTION due to which 'a' is very small and `(a)/(V^(2))` is negligible the value of 'b' is very large due to large size of the moecules both 'a' and 'b' are very small and negligible Answer :B

28.	..................involves conversion of solar energy into chemical energy.
Answer» SOLUTION :PHOTOSYNTHESIS

29.	Inverted sugar is
Answer» OPTICALLY inactive form of sugar Equimolecular MIXTURE of glucose and Equimolecular mixture of glucose and Mixture of glucose and fructose A variety of CANE sugar Answer :B

30.	Invertase bring about the conversion of
Answer» Starch of glucose Sucrose to glucose and fructose Maltose to glucose Glucose to `C_(2)H_(5)OH` and `CO_(2)` Answer :B

31.	It is not possible to prepare aryl cyanides from aryl halides. Why?
Answer» SOLUTION :ARYL HALIDES are LESS REACTIVE towards nucleophilic substitution.

32.	Invert sugar is obtained by hydrolysis of ........and contains equimolar amounts of ..........and ................
Answer» SOLUTION :SUCROSE , `D(+)-`GLUCOSE and `D(-)`-FRUCTOSE.

33.	Invertase converts sucrose into invert sugar.
Answer» ANSWER :1

34.	It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following side reaction//s can be used to reduce the activity of strongly activating groups like -OH ?
Answer» benzcylation acetylation both of the above NONE of the above Solution :N//A

35.	Invert sugar is mixture of
Answer» GLUCOSE and FRUCTOSE Glucose and LACTOSE Glucose and MALTOSE Lactose and maltose. ANSWER :A

36.	It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following is the correct major product ?
Answer» SOLUTION :N//A

37.	Invert sugaris a mixture of equal amount of ……….. .
Answer» LACTOSE + MALTOSE diastose+ galactose GLUCOSE + fructose starch + cellulose Answer :C

38.	It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following synthesis could be done in the ring step ?
Answer» SOLUTION :N//A

39.	It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different group ortho/ para di- recting group at the 1 and 4 positions, the position of further substitution is not immediately clear. Which of following is the incorrect major product ?
Answer» ANSWER :D

40.	Invert sugar is :
Answer» Sucrose Fructose Glucose Galactose Answer :A

41.	It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different group ortho/ para di- recting group at the 1 and 4 positions, the position of further substitution is not immediately clear. Which of the following synthesis could be done in the single step ?
Answer» ANSWER :C

42.	It is not advised to sleep in a closed room with a coke fire buring inside on a cold day because of the harmful effects of
Answer» CO carbond PARTICULATES `CO_(2)` `SO_(2)` presetn asimpurity in ckke FIRE. Answer :A

43.	Invert sugar as an equimolar mixture of glucose and fructose.
Answer» ANSWER :1

44.	Itisnecessaryto use…………….In theiodinationof alkane .
Answer» ALCOHOL oxidisingagent benzene reducingagent ANSWER :B

45.	Invert , maltase , zymase ,maltose,lactose .
Answer» Solution :MALTOSE. It is a CARBOHYDRATES WHEREAS OTHERS are enzymes.

46.	It is necessary to usea silentelectricdischangein thepreparationof ozonefromdioxygen - why ?
Answer» SOLUTION :A silverelectricdischange PRODUCES lessheat, preventingdecomposition of `O_(3)`BACK to` O_(2)`.

47.	Inversion of sucrose refers to
Answer» oxidation of SUCROSE REDUCTION of sucrose HYDROLYSIS of sucrose to GLUCOSE and fructose polymerisation of sucrose Solution :hydrolysis of sucrose to glucose and fructose

48.	It is not adviasable to:
Answer» Stir SUGAR SOLUTION with a steel spoon Stiir copper sulphate solution with a silver spoon Stir copper sulphate solution with a ZINC spoon Stir silver nitrate solution with a copper spoon Answer :C::D

49.	Inversion of sucrose (C_(12)H_(22)O_(11)) is first-order reaction and is studied by measuring angle of rotation at different instants of time underset(d)underset("Sucrose")(C_(12)H_(22)O_(11))+H_(2)Ooverset(H^(+))rarrunderset(d)underset("Glucose")(C_(6)H_(12)O_(6))+underset(l)underset("Fructose")(C_(6)H_(12)O_(6)) If (r_(oo)-r_(0))=a and (r_(oo)-r_(t))=(a-x) (where r_(0),r_(t) and r_(oo)) are the angle of rotation at the start, at the time t and at the end of the reaction respectively, then there is 50% inversion when :
Answer» `r_(0)=2r_(t)-r_(OO)` `r_(0)-r_(t)-r_(oo)` `r_(0)=r_(t)-2r_(oo)` `r_(0)=r_(t)+r_(oo_` ANSWER :A

50.	Inversion of sucrose is done in the presence of which catalyst ?
Answer» `Au_((s))` `H_((aq))^(+)` `NO_((G))` `ZnO-CrO_(3(s))` SOLUTION :`H_((aq))^(+)`