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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. |
Natural rubber is ……………………… |
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Answer» CIS polystyrene |
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| 2. |
Natural rubber has |
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Answer» alternate CIS-and trans-configuration |
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| 3. |
Natural rubber has - |
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Answer» All CIS-configuration |
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| 4. |
Natural rubber has : |
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Answer» All trans-configuration |
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| 5. |
Natural rubber becomes brittle at less than …………………….temp. |
| Answer» SOLUTION :273 K | |
| 6. |
Natural rubber and gutta - percha respectively are |
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Answer» CIS - POLYISOPRENE and trans - polyisoprene |
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| 9. |
Natural gas is a mixture of |
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Answer» `CO+CO_2` |
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| 10. |
Natural honey is distinguished artificial honey by adding............... |
| Answer» SOLUTION :Tollen.s REAGENT ( or ) AMMONIACAL `AgNO_3` | |
| 11. |
Natural gas is composed primarily of |
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Answer» METHANE |
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| 12. |
Natural fibres are of two types - the material that we for making clothes , is called cotton while the other fibre which constitutes a part of our food is called dietary fibre. Geetika , a class XII students , emphasized that besides adequate quantity of carbohydrates , oils and vitamins , the food we take must be rich in fibre. After reading the above passage, answer the following questions : (i) What type of carbohydrates are mainly used as food ? Name a few of them. (ii) What is dietary fibre ? Name its types and main sources. (iii) What values are expressed by Geetika about fibre rich food ? |
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Answer» Solution :(i) The carbohydrates which are mainly USED as food are : Monosaccharides - glucose , fructose , galactose , etc : . Disaccharides - sucrose , maltose , lactose , etc. . Polysaccharides -starch (ii) Indigestible carbohydrates which are not metabolized by our digestive enzymes are called diethary fibres. Chemically dietary fibre consists of cellulose. dextrins (resistant starch), lignin, chitins, pectins, etc. and some oligosaccharides. These are of two TYPES - (a) insoluble dietary (or edible) fibre which does not dissolve in water and (b) soluble dietary (or edible) fibre which is soluble in water. Their main sourcess are : Insoulble dietary fibre : Wheat bran , most leafy vegatables and many other vegatables such as broccoli, cabbage and aculiflower and whole grain bread and cereals are the main sourcesof insoluble dietary fibre. Soluble dietary : Legumes (peas, LENTILS soyabean and beans). oats , rye and barley, broccoli and carrots, potatoes, bananas, citrous fruits , apples berries and nuts, with ALMONDS being the higest in or skin. Good examples are citrous fruits, apples and patatoes. (iii) Geetika has expressed vales about fibre rich food for good health because of the following beefits. . Insoluble fibre adds BULK to your stool and keeps it soft , removes all the toxins adhearing to the walls. . Soluble fibre slows down uptake of dietary cholesterol thereby lowering the level of bad cholesterol , i.e., low density lipoprotein (LDL) in the blood. This can reduce your risk of coronary heary disease, heart attack and stroke . Soluble fibre also helps to maintain sugar level in the blood therby avoiding the risk of type 2 diabetes. . Both soluble and insoluble fibres may also promote weight loss since high fibre diet is less energy dense and promotes a sense of fullness. |
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| 14. |
Natural blood has not been synthesized so far. Are there any blood substitution? |
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Answer» Solution :A blood substitute (also called ARTIFICAL blood or blaad surrogate or blood extender) is a substance used to mimic and FULFIL some functions o f natural blood, usually its oxygen carrying ability. The main aim is to provide an alternative for blood transfustion, which is transferring blood and blood based products from one person into another. One class of blood substitutes are perfluorocarbons due to thir remarkably low toxicity, lack of biological activity, short retention time in the body and their ability to dissolve gases especially `O_(2)` and `CO_(2)`. thse oxygen carrying blood substitutes are also called oxygen therapeutics. and `CO_(2)`. these oxygen carrying blood substitutes are also called oxygen therapeutics. Since perfluorocarbons are immiscible in blood they are used in as an emulsion. the most commonly used perflurocarbon is perfluorodecalin. Oxygen therapeunutics EVEN if widely available, would not eliminate the use of human blood which performs a number of other functions besides oxygen transport. however, oxygen therapeutics have major adavantages over human blood in various situations, especially trauma. blood substitutes are use ful for the following reasons. 1. to eliminate chances of transmission of deadly diseases such as HIV/AIDS, small pox, etc. 2. In battlefields, it is often impossible to eprfom rapid blood transfusion because of short blood supply. 3. All patients irrespective of their blood group can be treated in trauma with blood substitutes without any immunologic reactions. 4. Blood substitutes can be stored at room temperature for MUCH longer time than natural blood. 5. Blood substitutes immediately allow full oxygen transport capacity as compared to transfused blood which requires about 24 hrs. |
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| 15. |
nAto products is a first order reaction with k=10" min"^(-1). If the reaction is started with [A]=0.4M, after. . ..min, [A] would become 0.04M. |
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Answer» `4.606` |
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| 16. |
Native silver metal forms a water soluble complex with a dilute solution of NaCN in the presence of : |
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Answer» nitrogen |
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| 17. |
Nathan Thomson, one of the the first inhabitants of lord howe Island. Decided to plant some eruopean deciduous trees in his garden. Unifortunately the exact timing of planting the seeds is not known, over the years, pollen produced by the trees accumulated at the bottom of the lake near Nathan,s house. Very small quantities of radioactive .^(210)Pb (t_(1//2) = 22.3 years) were deposited at the same time. Note that european deciduous trees pollinate in their first year of growth. In 1995, a team of researchers sampled a sediment core from the bottom of the lake. the examination of sediment core of found that: (a) Pollen of trees first occurs at the depth of 50 cm. The activity of .^(210)Pb at the top of sediment core is 356 Bq/kg and at 50 cm depth 1.40 Bq/kg. Which step in the decay scheme explains how .^(210)Pb ends up in rain water while its parent .^(238)U is only present in earth's crust? |
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Answer» `.^(238)U - .^(234)U` |
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| 18. |
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of |
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Answer» nitrogen `4Ag + 8NaCN + 2 H_(2)O + O_(2) rarr 4Na [Ag(CN)_(2)] + 4NaOH` HENCE, (B) is the correct ANSWER. |
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| 19. |
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCl in the presence of |
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Answer» NITROGEN |
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| 20. |
Native silver metal forms a water soluble complex with a dilute a s wolution of NaCN in the presence of |
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Answer» NITROGEN |
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| 21. |
Nathan Thomson, one of the the first inhabitants of lord howe Island. Decided to plant some eruopean deciduous trees in his garden. Unifortunately the exact timing of planting the seeds is not known, over the years, pollen produced by the trees accumulated at the bottom of the lake near Nathan,s house. Very small quantities of radioactive .^(210)Pb (t_(1//2) = 22.3 years) were deposited at the same time. Note that european deciduous trees pollinate in their first year of growth. In 1995, a team of researchers sampled a sediment core from the bottom of the lake. the examination of sediment core of found that: (a) Pollen of trees first occurs at the depth of 50 cm. The activity of .^(210)Pb at the top of sediment core is 356 Bq/kg and at 50 cm depth 1.40 Bq/kg. In what year did Nathan Thomson plant the seeds? |
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Answer» `1719 +- 2` `(0.693)/(22.30) = (2.303)/(t_("age")) log ((356)/(1.40))` `t_("age") = 176` yrs |
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| 22. |
Natalite is a mixture of, |
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Answer» DIETHYL ETHER and methanol |
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| 23. |
Narcotics are chemical substances which produce sleep and unconsciousness. Morphine diacetate is most widely used analgesic . How many double bond equivalents are present in morphine diacetate ? |
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Answer» |
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| 24. |
Narcotic analgesic like morphine, codein and heroin have________ present in their structure. |
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Answer» AZO GROUP and five rings |
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| 25. |
Narcotic analgesic is |
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Answer» aspirin |
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| 26. |
Narcotic analgesic are |
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Answer» ADDICT FORMING |
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| 27. |
Naproxen is _______analgesic |
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Answer» |
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| 28. |
NaPO_(3) can significantly react with how many of the following ? CaCl_(2), MgSO_(4), CaO, Na_(2)CO_(3), " dry " HCl, (HCO_(3))_(2), Na_(3)PO_(4) |
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Answer» `MgSO_(4) + NaPO_(3) rarr` Forms chelate complex with `Mg^(2+), [Mg(P_(3)O_(9))_(2)]^(4-)`, used in softening of hard water `CaO + NaPO_(3) rarr NaCaPO_(4)` `Na_(2)CO_(3) + NaPO_(3) rarr Na_(3) PO_(4) + CO_(2)` dry `HCL + NaPO_(3) rarr` No reaction `Ca(HCO_(3))_(2) + NaPO_(3) rarr` Forms chelate with `Ca^(2+), [Ca(P_(3)O_(9))_(2]^(4-)` used in softening of hard water. `Na_(3)PO_(4) + NaPO_(3) rarr Na_(4)P_(4)O_(7)` |
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| 29. |
Naphthalene,Anthracene and glucose are examples of ……………………… |
| Answer» SOLUTION :MOLECULAR CRYSTALS | |
| 30. |
Naphthalene is an example of…………………………………………… |
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Answer» ionic SOLID |
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| 31. |
Naoverset(H_(2)O)(to)Aoverset(CO_(2))(to)Boverset(SO_(2))(to)Coverset(Na_(2)S"/"I_(2))underset(delta)(to)Doverset(Ag^(+)"/"Salt)(to)E(complex) Q. The compound D is |
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Answer» `Na_(2)SO_(4)` |
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| 32. |
Naoverset(H_(2)O)(to)Aoverset(CO_(2))(to)Boverset(SO_(2))(to)Coverset(Na_(2)S"/"I_(2))underset(delta)(to)Doverset(Ag^(+)"/"Salt")(to)E(complex) Q.Oxidation number of each 'S' atom in compound D: |
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Answer» `+2, +2` |
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| 33. |
NaOH_((aq)), HCl_((aq)) and NaCl_((aq)) concentration of each is 10^(-3) M. Their pH will be respectively |
| Answer» Answer :B | |
| 34. |
{:(,"NaOH,","KOH"),("v.f"rarr,1,1),("Eq. wt."rarr,M//1,M//1):} |
| Answer» Solution :Bases may be DEFINED as the substances in which OH group is/are DIRECTLY attached with group I elements(Li, Na, K, Rb, Cs), group II elements (Be, Mg, Ca, Ba) or group III elements (Al, Ga, In, Tl), TRANSITION metals, non-metallic captions like `PH_(4)^(+),NH_(4)^(+)` etc. | |
| 35. |
NaOH + S rarr Na_(2)S_(5) + Na_(2)S_(2)O_(3) + H_(2)O Balance the above reaction and find the mole coefficients of the reactants. |
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Answer» |
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| 36. |
NaOH reacts with white phosphorus to give |
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Answer» <P>`PH_(3)` |
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| 37. |
NaOH is a atrong base because |
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Answer» It gives `OH^(-)` ion |
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| 38. |
NaOH is prepared by the electrolysis of: |
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Answer» Aqueous solution of SODIUM chloride with PLATINUM electrode |
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| 39. |
NaOH//H^(+) reacts with |
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Answer» `C_(6)H_(5)OCH_(3)` |
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| 40. |
NaOH +F_(2) topale yellow gas (X). The hybridisationand bond angle in X are |
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Answer» `sp^(3), 103^(0)` |
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| 41. |
NaOHcan beused to seprate Al(OH)_(3) and Zn(OH)_(3) . |
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Answer» |
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| 42. |
NaOHcan beused to seprate Al(OH)_(3) and Zn(OH)_(2) . |
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Answer» `AI(OH)_(3) + NaOH RARR NaAIO_(2) `or `NA[AI(OH)_(6)]+ 2H_(2)O` `Zn(OH)_(2) + 2NaOH rarr Na_(2)(Zn(OH)_(4)] or Na_(2)ZnO_(2) + 2H_(2)O` |
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| 43. |
NaoH and Na_(2)CO_(3) are dissolved in 200 ml aqeous solution. In the presence of phenolpthaleim indicator, 17.5 ml of 0.1 HCl are used to titrated this solution. Now methyl orange is addedin the same solution titrated and requires 2.5 ml of the same HCl. Calculate the normality of NaOH & NaCO_(3). |
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Answer» `0.5, 1.5/200` |
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| 44. |
NaOH behaves as a base while Zn(OH)_(2) is amphoteric why? |
| Answer» Solution :In NaOH the bond electronegativity difference between NA and oxygen is greater than between Hand O and therefore it is the Na-O bond that breaks RELEASING OH. But in case of Zn-O-H bond the difference of electronegativity of ZnO and O-H are almost same. So there is equal PROBABILITY that the bond breaks in both ways LEADING to an amphoteric behaviour | |
| 45. |
NaOH aqueous solution is labelled as 10% (w/v). Density of the solution is 1.02 g/ml. Then the mole fraction of the solute in the solution is |
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Answer» `0.05` |
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| 46. |
NaOH can absorb: |
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Answer» `N_2O_5` |
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| 47. |
NaOCl reacts with NH_3to produce....... |
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Answer» `NH_(2)OH` |
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| 48. |
Names of some cpmpounde are given. Which one is not in IUPAC system : |
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Answer» `UNDERSET("5-Methyl-4-ethylheptane")(CH_(3)-CH_(2)-CH_(2)-underset(CH_(2)CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-CH-CH_(2)-CH_(3))` |
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| 49. |
Name various techniques by which a colloid can be deemulsified. |
| Answer» Solution :(iii) Destroying the emulsifier using chemical methods. (IV) Using SOLVENT extraction to remove one component. (v) By freezing one of the components. (vi) By applying centrifugal force. (VII) Adding dehydrating agents for water in oil (W/O) TYPE. (viii) Using ultrasonic waves. (IX) Heating at high pressures. | |
| 50. |
Name two water soluble vitamins, their sources, function and diseases caused due to their deficiency in diet. |
Answer» SOLUTION :
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