100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	Major prduces of mononitration of 3-methyphenol isA. B. C. D. Both A and B
Answer» Correct Answer - D Both `-OH` and `-CH_3` groups are o,p-directing groups. However, position `o^(-)` to both these groups is sterically hindred.

Discussion

2.	How are antiseptics different from disinfectants ? How does an antibiotic different from these two ? Give one example of each of them.
Answer» [Hint : Antiseptics may kill or stop the growth of microbes and safe for living tissues, where an disinfectants kill microbes but not safe for living tissues. While antibiotic are produced by micro organism, can inhibit the growth of other microorganism. Example : Antiseptic : 0.2% phenol, Disinfectant : 1% phenol, Antibiotic : Penicillin]

Discussion

3.	Among the following which statement is/are correct. (A)`CH_3-oversetoverset(O)(\|\|)C-OHoverset(X_2//OH^(-))to`Will not respond to haloform test (B)`CH_2=CH-CH=Ooverset(overset(Theta)OH//Delta)to` Gives cannizzaro reaction. `( C)Cl-undersetunderset(Cl)(\|)oversetoverset(Cl)(\|)C-CH=Ooverset(oversetthetaOH//Delta)to`Does not give cannizzaro reaction. (D)
Answer» Correct Answer - A,B,C (A)acid cannot give iodoform reaction. (B)lacks in a`alpha`-hydrogen. It gives cannizzaro. (C )It can give haloform reaction because of `C Cl_3` group.

Discussion

4.	if the formula of an organic compound is C4H8, it is
Answer» Answer: 1-Butene The formula of alkene is Cn H 2n. Since n=4, the nomenclature should start with but and since being an alkene, it is butene.

Discussion

5.	Name the antioxidants commonly used to increase the storage of butter.
Answer» [Hint : BHA (Butylated Hydroxy anisole).]

Discussion

6.	Define the terms lattice, basis, primitive cell.
Answer» Lattice: A lattice is in general defined as a discrete but infinite regular arrangement of points (lattice sites) in a vector space. Basis: A basis is a collection of atoms in particular fixed arrangement in space. We could have a basis of a single atom as well as a basis of a complicated but fixed arrangement of hundreds of atoms. Primitive: A primitive cell is a unit cell corresponding to a single lattice point of a structure with discrete translational symmetry. The concept is used particularly in describing crystal structure in two and three dimensions, though it makes sense in all dimensions. A lattice can be characterized by the geometry of its primitive cell.

6.

Define the terms lattice, basis, primitive cell.

Answer»

Lattice: A lattice is in general defined as a discrete but infinite regular arrangement of points (lattice sites) in a vector space.

Basis: A basis is a collection of atoms in particular fixed arrangement in space. We could have a basis of a single atom as well as a basis of a complicated but fixed arrangement of hundreds of atoms.

Primitive: A primitive cell is a unit cell corresponding to a single lattice point of a structure with discrete translational symmetry. The concept is used particularly in describing crystal structure in two and three dimensions, though it makes sense in all dimensions. A lattice can be characterized by the geometry of its primitive cell.

Discussion

7.	Indicate the antipsychotic drug having H1-antihistaminic activity: a) Clozapine b) Chlorpromazine c) Olanzapine d) All of the above
Answer» d) All of the above

Discussion

8.	Indicate the antipsychotic drug having a muscarinic-cholinergic blocking activity: a) Chlorpromazine b) Clorprothixene c) Risperidone d) Haloperidol
Answer» a) Chlorpromazine

Discussion

9.	Indicate the antipsychotic drug having significant peripheral alpha-adrenergic blocking activity: a) Haloperidol b) Chlorpromazine c) Clozapine d) Risperidone
Answer» b) Chlorpromazine

Discussion

10.	Indicate the antipsychotic drug, which is a thioxanthene derivative: a) Haloperidol b) Clozapine c) Chlorpromazine d) Thiothixene
Answer» d) Thiothixene

Discussion

11.	Which of the following antipsychotic agents is preferable in patients with coronary and cerebrovascular disease? a) Chlorpromazine b) Fluphenazine c) Haloperidol d) Perphenazine
Answer» c) Haloperidol

Discussion

12.	The mechanism of haloperidol antipsychotic action is: a) Blocking D2 receptors b) Central alpha-adrenergic blocking c) Inhibition of norepinephrine uptake mechanisms d) All of the above
Answer» d) All of the above

Discussion

13.	Which of the following antipsychotic agents is used in combination with an opioid drug fentanyl in neuroleptanalgesia? a) Haloperidol b) Droperidolc) Chlorpromazine d) Clozapine
Answer» b) Droperidol

Discussion

14.	Most accepted model of Biomembrane is best referred as ‘Protein Icebergs in the sea of Lipid”. 1. Name the most accepted structural model for the Biomembrane. 2. Who proposed it?
Answer» 1. Fluid mosaic model 2. Singer & Nicholson

14.

Most accepted model of Biomembrane is best referred as ‘Protein Icebergs in the sea of Lipid”. 1. Name the most accepted structural model for the Biomembrane. 2. Who proposed it?

Answer»

1. Fluid mosaic model

2. Singer & Nicholson

Discussion

15.	Indicate the atypical antipsychotic drug: a) Haloperidol b) Clozapine c) Thioridazine d) Thiothixene
Answer» Indicate the atypical antipsychotic drug Clozapine.

Discussion

16.	Which of the following antipsychotic drugs is typical? a) Clozapine b) Quetiapine c) Haloperidol d) Olanzapine
Answer» Haloperidol antipsychotic drugs is typical.

Discussion

17.	Tardive dyskinesia is the result of: a) Degeneration of dopaminergic and cholinergic fibers b) Hyperactive dopaminergic state in the presence of dopamine blockers c) Degeneration of histaminergic fibers d) Supersensitivity of cholinergic receptors in the caudate-putamen
Answer» b) Hyperactive dopaminergic state in the presence of dopamine blockers

Discussion

18.	Which of the following statements is correct for clozapine? a) Has potent anticholinergic activity b) Has high affinity for D1 and D2 dopamine receptors c) Produces significant extrapyramidal toxicity d) Is related to typical antipsychotic agents
Answer» a) Has potent anticholinergic activity

Discussion

19.	Give balanced equations for the following. "Extraction of silver from silver glance by cyanide process".
Answer» In case of silver metal, the sulphide ore is treated with sodium cyanide. Sodium argentocynade complex is formed, which on treating with zinc metal gives silver. `Ag_(2)S + 4NaCN rarr 2N[Ag(CN)_(2)] + Na_(2)S` `2Na[Ag(CN)_(2)] + Zn rarr underset ("Soluble") (Na_(2)[Zn(CN)_(4)]) + underset ("ppt")(2 Ag) darr`.

Discussion

20.	Each of the following statements is true only under some specific conditions. Write the condition for each sub-equation in not more than two sentences. (i) Metals can be recovered from their ores by chemical methods. (ii) High purity metals can be obtained by zone refining method.
Answer» (i) Many metals occur in nature as oxides, carbonates, sulphides, which can be calcined or roasted. Then, they can further treated chemically to get the metal. (ii) Elements such as `Si,Ge,Ga` etc., which are used as semiconductors, are refined by zone refining method. Highly pure metals are obtained. The method is based on the difference in solublility of impurities on molten and solid state of the metal. A movable heater is fitted around a rod of the impure metal. The heater is slowly mogved across the rod. The metal melts at the point of heating, and as the heater moves on from one end of the rod to the other end, the pure metal crystallises, while the impurities pass on to the adjacent molten zonc.

Discussion

21.	Answer the following questions briefly. (i) What is the actual reducing agent of haematite in blast furnace ? (ii) Give the equations for the recovery of lead from galena by air reduction. (iii) Why is sodium chloride added during electrolysis of fused anhydrous magnesium chloride. (iv) Zinc, not copper, is used for the recovery of metallic silver from the complex `[Ag(CN)_(2)]`. Explain. (v) Why is chalcocite roasted and not calcinated during recovery of copper ?
Answer» (i) For iron, first by calcination and roasting, the ferrous oxide is oxidised to ferric oxide. Then, in blast furnace, smelting is done, where it is reduced to get iron. `4FeO + O_(2) rarr 2Fe_(2)O_(3)` `Fe_(2)O_(3) + CO rarr 2Fe_(3)O_(4) + CO_(2)` `Fe_(2) O_(3) + Co rarr FeO + CO_(2)` `FeO + CO rarr Fe + CO_(2)`. Carbon monoxide is the actual reducing agent of haematite in the blast furnace. (ii) Lead is mainly extracted from sulphide ore called galena. Roasting is done followed by reduction with carbon. Self-reduction finally takes place. `2PbS + 3O_(2) rarr 2PbO + SO_(2)` `PbS + 2O_(2) rarr PbSO_(4)` `PbSO_(4) + PbO rarr 2Pb + 2SO_(2)` `PbS + 2PbO rarr 3Pb + SO_(2)` (iii) The anhydrous magnesium chloride is fused with `NaCl` and anhydrous calcium chloride. The mixture is electrolysed at `700^@C` in the presence of an inert gas in an electrolytic cell. Magnesium is discharged at the cathode. The purpose of the addition of `NaCl` and `CaCl_(2)` to anhydrous `MgCl_(2)` is to lower the fusion temperature and make the fused mass a good conductor of electricity. Sodium prevents the hydrolysis of magnesium chloride. (iv) Zinc is more reducing and cheaper than copper. (v) Chalcocite is a sulphide ore of copper , therefore, it must be roasted in the presence of air to get oxide.

Discussion

22.	Why is the 3rd ionization energy of Mn (Z = 25) is unexpectedly high ?
Answer» Ans. Due to half-fllled electronic conflguration.

Discussion

23.	Transition metals show zero oxidation state with ligands like CO. Explain.
Answer» Co form synergic bonding with metal ion.

Discussion

24.	Name one ore of Mn and Cr.
Answer» Mn : MnO₂ Cr : FeCr₂O₄

Discussion

25.	Why cant HCl acid be used to acidify KMnO4 solution ?
Answer» Because KMnO₄ oxidize HCl into Cl₂.

Discussion

26.	Assertion : Hydrochloric acid is not used to acidify a `KMnO_(4)` solution in volumetric analysis of `Fe^(2+)` and `C_(2) O_(4)^(2-)` because. Reason : Part of the oxygen produced from `KMnO_(4)` and `HCl` is used up in oxidising `HCl` to `Cl_(2)`.
Answer» This is because a part of oxygen produced from `KMnO_4+HCl` is used up in oxidising `HCl` to `Cl_2`. `4HCl+2(O)to2H_2O+Cl_2`

Discussion

27.	Give the decreasing order of `C-H` bond length in ethane, ethene and ethyne and why?
Answer» The decreasing `C-H` bond length is : Ethane`(C_(2)H_(6))gt` Ethene `(C_(2)H_(4))gt` Ethyne `(C_(2)H_(2))`. This is because the bybrid orbitals of C-atom involved in ovelapping with 1s orbital of H-atom are `sp^(3),sp^(2) and sp` respectively and their sizes are in the order. `sp^(3)gtsp^(2)gtsp`. Alternatively: The `(C-C)` bond length gt `(C=C)` bond length `(C-=C)`bond length.

Discussion

28.	Which of the following statement(s) is/are INCORRECT ?A. All spectral belonging to Paschen series in `He^(+)` spectrum lie in visible region.B. If ligbht of frequency `v` falls on a metal surface having work funcation `hv_(0)`, photoelectric effect can take place only if `v ge v_(0)`.C. A metal with lesser work function produce more number of photoelectron if intensity and frequency of radiation is same as that for metal with more work function.D. As temperature of a blackbody is increased the intensity at smaller increases and that at longer wavlength decreases.
Answer» Correct Answer - A::C::D (A) Only first four spectral line belonging to Baimer series in hydrogen spectrum lie in visible riglon. (B) If a light of frequency `v` falls on a meta,l surface having if `v ge ve`. Since `v_(0)` is the minimum frequency required for photoetectric effect.

Discussion

29.	Which of the following option(s) is/are independent of both `n` and `Z` for `H-`like species? `U_(n) =` Potential energy of electron in `n^(th)` orbit `KE_(n) =` Kinetic energy of electron in `n^(th)` orbit `l_(n) =` Angular momentam of electoron in `n^(th)` orbit `v_(n) =` Velcity of electron in `n^(th)` orbit `f_(n) =` Frequency of electron in `n^(th)` orbit `T_(n) =` Time period of revolution of electron in `n^(th)` orbitA. `(r_(n))/(U_(n))`B. `r_(n) xx KE_(n) xx l_(n)`C. `(U_(n) xx T_(n))/(l_(n))`D. `(l_(n) xx f_(n))/(v_(n)^(2))`
Answer» Correct Answer - C::D `(r_(n))/(U_(n))=((r_(0)n^(2))/(Z))/(-2E_(0)(Z^(3))/(n^(2))) = (r_(0))/(-2E) (n^(4))/(Z^(3))` `r_(n).KE_(n).l_(n)=(r_(0)n^(2))/(Z)xx(E_(0)Z^(3))/(n^(2))xx(nh)/(2pi)=(r_(0)E_(0Znh))/(2pi)` `(U_(n)xxT_(n))/(l_(n))=((-2E_(0)Z^(3))/(n^(2))xxT_(0)(n^(3))/(Z^(2)))/((nh)/(2pi))=(-2E_(0)T_(0))/(h)xx2pi` `(l_(n)xxt_(n))/(v_(n^(2)))=((nh)/(2pi)xxf_(0)xx(Z^(2))/(n^(3)))/((v_(0)(Z)/(n))^(2)) =(hf_(0))/(2piv_(0)^(2))`

Discussion

30.	The element that does NOT exhibit allotropy isA. phosphorusB. arsenicC. antimonyD. bismuth
Answer» Correct Answer - D Bismuth

Discussion

31.	The purest zinc is made byA. electrolytic refiningB. zone refiningC. the van-Arkel methodD. the Mond process
Answer» Correct Answer - A The purest zinc is made by electrolytic refining.

Discussion

32.	How many metameric ethers are represented by the molecular formula `C_(4)H_(10)O`?A. 4B. 3C. 2D. 5
Answer» Correct Answer - B There are 4-metameric ether that are represented by the molecular formula `C_(4)H_(10)`,Which are as follows: `underset("Methoxypropane")(CH_(3)OCH_(2)CH_(2)CH_(3)),underset("Ethoxyethane")(C_(2)H_(5)OC_(2)H_(5)), underset(2-"methoxypropane")(CH_(3) - O-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(CH)`

Discussion

33.	The activation energy of a reaction is zero. Its rate constant at 280 K is `16 xx 10^(-6) s^(-1)` the rate constant at 300k isA. `3.2 xx 10^(-6) s^(-1)`B. zeroC. `1.6 xx 10^(-6)s^(-1)`D. `1.6 xx 10^(-5)s^(-1)`
Answer» Correct Answer - C `"log" (k_(2))/(k_(1)) = (E_(a))/(2.303 R) [(1)/(T_(1)) - (1)/(T_(2))]` Given, Activation energy of a reaction, `E_(A) = 0` Rate constant, `k_(1) = 1.6 xx 10^(-6) s^(-1)` Temperature, `T_(1) = 280 K, T_(2) = 300 K` According to Arrhenius equation `"log" (k_(2))/(1.6 xx 10^(-6)) = (0)/(2.303 R) [(1)/(280) - (1)/(300)]` `"log" (k_(2))/(1.6 xx 10^(-6)) = 0` `(k_(2))/(1.6 xx 10^(-6))` = antilog 0 `(k_(2))/(1.6 xx 10^(-6)) = 1` `:. k_(2) = 1.6 xx 10^(-6) s^(-1)`

Discussion

34.	Carborundum is the commercial name ofA. SiCB. `Al_(2)O_(3)*H_(2)O`C. `Al_(2)(SO_(4))_(3)`D. `AlCl_(3)`
Answer» Correct Answer - A Silica is heated with carbon in electric furnance , it is reduced to carborundum or silicon carbide. `SiO_(2)+3C to SiC +2CO `

Discussion

35.	What is meant by Allen’s Rule?
Answer» Allen’s rule refers to the reduction of heat loss in animals by having shorter ears and limbs

Discussion

36.	What does ecological niche of an organism represent?
Answer» Ecological niche of an organism represents the range of conditions it can tolerate, the resources it utilizes and its functional role in the ecosystem.

Discussion

37.	What is a nucleoid?
Answer» Nucleoid is the primitive nucleus of prokaryotic cells. It is the region in prokaryotic cells where DNA is held with some positively-charged proteins.

Discussion

38.	Name one infectious and one non-infectious disease that is the major cause of mortality.
Answer» Infectious disease – AIDS. Non-infectious disease – Cancer

38.

Name one infectious and one non-infectious disease that is the major cause of mortality.

Answer»

Infectious disease – AIDS.

Non-infectious disease – Cancer

Discussion

39.	Mention the source organism of the gene Cry1Ac and its target pest.
Answer» Bacillus thuringiensis is the source organism and its target pest is cotton bollworm.

Discussion

40.	Write the scientific name of the microbe used for fermenting malted cereals and fruit juices.
Answer» Saccharomyces

Discussion

41.	When gold crystallizes to form body-centred cubic cells. The unit cell edge length is 308 pm. Calculate the density of gold. Molar mass of gold is 197 g/ mol.
Answer» Gold crystalized in body-centered cubic cells it means number of atoms per unit cells=2. \(\therefore\) Density of Au \(=\frac{Ƶ M_{Au}}{a^3 N_A}\) \(= \frac{2\times197}{(308)^3\times(10^{-12})^3\times6.02\times10^{23}}\) \(=\frac{394}{2.92\times10^{-29}\times6.02\times10^{23}}\) \(=\frac{394}{17.58\times 10^{-6}}\) \(=22.4\times10^6 g/m^3\) or \(=22.4 \,g/cm^3\)

41.

When gold crystallizes to form body-centred cubic cells. The unit cell edge length is 308 pm. Calculate the density of gold. Molar mass of gold is 197 g/ mol.

Answer»

Gold crystalized in body-centered cubic cells it means number of atoms per unit cells=2.

\(\therefore\) Density of Au \(=\frac{Ƶ M_{Au}}{a^3 N_A}\)

\(= \frac{2\times197}{(308)^3\times(10^{-12})^3\times6.02\times10^{23}}\)

\(=\frac{394}{2.92\times10^{-29}\times6.02\times10^{23}}\)

\(=\frac{394}{17.58\times 10^{-6}}\)

\(=22.4\times10^6 g/m^3\)

or \(=22.4 \,g/cm^3\)

Discussion

42.	A solution is made from \( 35 ml \) of Methanol and \( 65 ml \) of water. Calculate the volume percentage.
Answer» Volume percentage \(=\frac{Volume \,of\, solute\,(ml) }{Total\,volume\,of\,solution\,(ml)}\times100\) \(\therefore\) Total volume of solution = (35+65)ml = 100ml \(\therefore\) Volume percentage of methanol \(=\frac{35}{100}\times 100\) = 35%

42.

A solution is made from \( 35 ml \) of Methanol and \( 65 ml \) of water. Calculate the volume percentage.

Answer»

Volume percentage \(=\frac{Volume \,of\, solute\,(ml) }{Total\,volume\,of\,solution\,(ml)}\times100\)

\(\therefore\) Total volume of solution = (35+65)ml

= 100ml

\(\therefore\) Volume percentage of methanol \(=\frac{35}{100}\times 100\)

= 35%

Discussion

43.	The main mechanism of most drugs absorption in GI tract is: a) Active transport (carrier-mediated diffusion) b) Filtration (aqueous diffusion) c) Endocytosis and exocytosis d) Passive diffusion (lipid diffusion)
Answer» d) Passive diffusion (lipid diffusion)

Discussion

44.	A hydrophilic medicinal agent has the following property: a) Low ability to penetrate through the cell membrane lipids b) Penetrate through membranes by means of endocytosis c) Easy permeation through the blood-brain barrier d) High reabsorption in renal tubules
Answer» a) Low ability to penetrate through the cell membrane lipids

Discussion

45.	Stimulation of liver micro somal enzymes can: a) Require the dose increase of some drugs b) Require the dose decrease of some drugs c) Prolong the duration of the action of a drug d) Intensify the unwanted reaction of a drug
Answer» a) Require the dose increase of some drugs

Discussion

46.	Bio transformation of a medicinal substance results in: a) Faster urinary excretion b) Slower urinary excretion c) Easier distribution in organism d) Higher binding to membranes
Answer» a) Faster urinary excretion

Discussion

47.	Elimination rate constant (Kelim) is defined by the following parameter: a) Rate of absorption b) Maximal concentration of a substance in plasma c) Highest single dose d) Half life (t ½)
Answer» d) Half life (t ½)

Discussion

48.	What is implied by «active transport»? a) Transport of drugs trough a membrane by means of diffusion b) Transport without energy consumption c) Engulf of drug by a cell membrane with a new vesicle formation d) Transport against concentration gradient
Answer» d) Transport against concentration gradient

Discussion

49.	Systemic clearance (CLs) is related with: a) Only the concentration of substances in plasma b) Only the elimination rate constant c) Volume of distribution, half life and elimination rate constant d) Bio availability and half life
Answer» c) Volume of distribution, half life and elimination rate constant

Discussion

50.	What does “pharmacokinetics” include? a) Localization of drug action b) Mechanisms of drug action c) Excretion of substances d) Interaction of substances
Answer» c) Excretion of substances

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Major prduces of mononitration of 3-methyphenol isA. B. C. D. Both A and B

How are antiseptics different from disinfectants ? How does an antibiotic different from these two ? Give one example of each of them.

if the formula of an organic compound is C4H8, it is

Name the antioxidants commonly used to increase the storage of butter.

Define the terms lattice, basis, primitive cell.

Indicate the antipsychotic drug having H1-antihistaminic activity: a) Clozapine b) Chlorpromazine c) Olanzapine d) All of the above

Indicate the antipsychotic drug having a muscarinic-cholinergic blocking activity: a) Chlorpromazine b) Clorprothixene c) Risperidone d) Haloperidol

Indicate the antipsychotic drug having significant peripheral alpha-adrenergic blocking activity: a) Haloperidol b) Chlorpromazine c) Clozapine d) Risperidone

Indicate the antipsychotic drug, which is a thioxanthene derivative: a) Haloperidol b) Clozapine c) Chlorpromazine d) Thiothixene

Which of the following antipsychotic agents is preferable in patients with coronary and cerebrovascular disease? a) Chlorpromazine b) Fluphenazine c) Haloperidol d) Perphenazine

The mechanism of haloperidol antipsychotic action is: a) Blocking D2 receptors b) Central alpha-adrenergic blocking c) Inhibition of norepinephrine uptake mechanisms d) All of the above

Which of the following antipsychotic agents is used in combination with an opioid drug fentanyl in neuroleptanalgesia? a) Haloperidol b) Droperidolc) Chlorpromazine d) Clozapine

Most accepted model of Biomembrane is best referred as ‘Protein Icebergs in the sea of Lipid”. 1. Name the most accepted structural model for the Biomembrane. 2. Who proposed it?

Indicate the atypical antipsychotic drug: a) Haloperidol b) Clozapine c) Thioridazine d) Thiothixene

Which of the following antipsychotic drugs is typical? a) Clozapine b) Quetiapine c) Haloperidol d) Olanzapine

Tardive dyskinesia is the result of: a) Degeneration of dopaminergic and cholinergic fibers b) Hyperactive dopaminergic state in the presence of dopamine blockers c) Degeneration of histaminergic fibers d) Supersensitivity of cholinergic receptors in the caudate-putamen

Which of the following statements is correct for clozapine? a) Has potent anticholinergic activity b) Has high affinity for D1 and D2 dopamine receptors c) Produces significant extrapyramidal toxicity d) Is related to typical antipsychotic agents

Give balanced equations for the following. "Extraction of silver from silver glance by cyanide process".

Each of the following statements is true only under some specific conditions. Write the condition for each sub-equation in not more than two sentences. (i) Metals can be recovered from their ores by chemical methods. (ii) High purity metals can be obtained by zone refining method.

Why is the 3rd ionization energy of Mn (Z = 25) is unexpectedly high ?

Transition metals show zero oxidation state with ligands like CO. Explain.

Name one ore of Mn and Cr.

Why cant HCl acid be used to acidify KMnO4 solution ?

Assertion : Hydrochloric acid is not used to acidify a `KMnO_(4)` solution in volumetric analysis of `Fe^(2+)` and `C_(2) O_(4)^(2-)` because. Reason : Part of the oxygen produced from `KMnO_(4)` and `HCl` is used up in oxidising `HCl` to `Cl_(2)`.

Give the decreasing order of `C-H` bond length in ethane, ethene and ethyne and why?

The element that does NOT exhibit allotropy isA. phosphorusB. arsenicC. antimonyD. bismuth

The purest zinc is made byA. electrolytic refiningB. zone refiningC. the van-Arkel methodD. the Mond process

How many metameric ethers are represented by the molecular formula `C_(4)H_(10)O`?A. 4B. 3C. 2D. 5

The activation energy of a reaction is zero. Its rate constant at 280 K is `16 xx 10^(-6) s^(-1)` the rate constant at 300k isA. `3.2 xx 10^(-6) s^(-1)`B. zeroC. `1.6 xx 10^(-6)s^(-1)`D. `1.6 xx 10^(-5)s^(-1)`

Carborundum is the commercial name ofA. SiCB. `Al_(2)O_(3)*H_(2)O`C. `Al_(2)(SO_(4))_(3)`D. `AlCl_(3)`

What is meant by Allen’s Rule?

What does ecological niche of an organism represent?

What is a nucleoid?

Name one infectious and one non-infectious disease that is the major cause of mortality.

Mention the source organism of the gene Cry1Ac and its target pest.

Write the scientific name of the microbe used for fermenting malted cereals and fruit juices.

When gold crystallizes to form body-centred cubic cells. The unit cell edge length is 308 pm. Calculate the density of gold. Molar mass of gold is 197 g/ mol.

A solution is made from \( 35 ml \) of Methanol and \( 65 ml \) of water. Calculate the volume percentage.

The main mechanism of most drugs absorption in GI tract is: a) Active transport (carrier-mediated diffusion) b) Filtration (aqueous diffusion) c) Endocytosis and exocytosis d) Passive diffusion (lipid diffusion)

A hydrophilic medicinal agent has the following property: a) Low ability to penetrate through the cell membrane lipids b) Penetrate through membranes by means of endocytosis c) Easy permeation through the blood-brain barrier d) High reabsorption in renal tubules

Stimulation of liver micro somal enzymes can: a) Require the dose increase of some drugs b) Require the dose decrease of some drugs c) Prolong the duration of the action of a drug d) Intensify the unwanted reaction of a drug

Bio transformation of a medicinal substance results in: a) Faster urinary excretion b) Slower urinary excretion c) Easier distribution in organism d) Higher binding to membranes

Elimination rate constant (Kelim) is defined by the following parameter: a) Rate of absorption b) Maximal concentration of a substance in plasma c) Highest single dose d) Half life (t ½)

What is implied by «active transport»? a) Transport of drugs trough a membrane by means of diffusion b) Transport without energy consumption c) Engulf of drug by a cell membrane with a new vesicle formation d) Transport against concentration gradient

Systemic clearance (CLs) is related with: a) Only the concentration of substances in plasma b) Only the elimination rate constant c) Volume of distribution, half life and elimination rate constant d) Bio availability and half life

What does “pharmacokinetics” include? a) Localization of drug action b) Mechanisms of drug action c) Excretion of substances d) Interaction of substances

Why cant HCl acid be used to acidify KMnO4 solution ?