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InterviewSolution
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.
| 1. |
When light shines on a p-n junction diode, the current (I) vs, voltage (V) is observed as in the figure below : In which quadrant(s) does the diode generate power, so that it can be used as a solar cell ?A. Quad 1 onlyB. Quad 1 and 3 onlyC. Quad 4 onlyD. Quad 1 and 4 only |
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Answer» Correct Answer - C |
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| 2. |
The acidity of compounds I-IV in water I. Ethanol II. Acetic Acid III. Phenol IV. Acetonitrile follows the orderA. `IVltIltIIIltII`B. `IltIIltIIIltIV`C. `IVltIltIIltIII`D. `IVltIIIltIltII` |
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Answer» Correct Answer - A Acetic acid is most acidic due to equivalent resonating structure. |
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| 3. |
Which of the following results from conjugation in Paramecium ?A. Cell deathB. Cell divisionC. BuddingD. Recombination |
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Answer» Correct Answer - D Conjugation in paramecium results in recombination |
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| 4. |
Forelimbs if whales, bats, humans and cheetah are examples of which of the following processes?A. Divergent evolutionB. Convergent evolutionC. AdaptationD. Saltation |
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Answer» Correct Answer - A Fore limbs of whale, bat, human & cheetah are homologous organ which represents divergent evolution. |
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| 5. |
Let f : R → R be a continuous function satisfying f(x) = x + ∫ f(t) dt ,x∈ [0,x] for all x ∈ R. Then the number of elements in the set S = {x ∈ R ; f(x) = 0} is- (A) 1 (B) 2 (C) 3 (D) 4 |
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Answer» Correct Option :- (A) 1 Explanation :- f ′ (x) = 1 + f(x) ⇒ f(x) = ex – 1 f (x) = 0 ⇒ ex = 1 x = 0 One solution |
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| 6. |
Suppose `A=[{:(a,b),(c,d):}]` is real matrix with nonzero entries, ad-bc=0 , and `A^(2)`=A. Then a+d equalsA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A `A^(2)=[{:(a,b),(c,d):}][{:(a,d),(c,d):}] ad =bc implies (a)/(b)=(c)/(d)=k` `=[{:(a^(2)+bc,ab+bd),(ac+cd,bc+d^(2)):}] a=bk,c=dk` `a^(2)+bc=a ,b(a+d)=b` `impliesa+d=1` |
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| 7. |
In a Mathematics test, the average marks of boys is `x%` and the average marks of girls is `y%` with `xney.` If the average marks of all students is `z%` the ration of the number of girls to the total number of students isA. `(z-x)/(y-x)`B. `(z-y)/(y-x)`C. `(z+y)/(y-x)`D. `(z+x)/(y-x)` |
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Answer» Correct Answer - A Given Let no. of Boys = B `&` no of girls = G `therefore` Sum of marks obtained by boys = b.x `therefore` Sum of marks obtained by girls = Gy Now, given `(Bx+Gy)/(B+G)=z` `B(x-z)=G(z-y)` `(B)/(G)=(z-y)/(x-z)` `"Add " 1` `(B)/(G)+1=(z-y)/(x-z)+1` `rArr(B+G)/(G)=(x-y)/(x-z)` `rArr(G)/(B+G)=(z-x)/(y-x)` |
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| 8. |
Let S be the set of all points `((a)/(b),(c)/(d))` on the circle with radius 1 centred at (0,0) where a and b are relatively prime integers, c and d are relatively prime integers (that is HCF (a, b) = HCF (c,d) = 1), and the integers b and d are even. Then the set SA. is emptyB. has four elementsC. has eight elementsD. is infinite |
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Answer» Correct Answer - A `"circle is "x^(2)+y^(2)=1` `y=pmsqrt(1-(a^(2))/(b^(2)))" "(becausex=(a)/(b))` `y=pm(1)/(b)sqrt((b^(2))-a^(2))` As y is retional so `underset("even")underset(darr)(b^(2))-underset("odd")underset(darr)(a^(2))=underset("odd")underset(darr)(p^(2))` `b^(2)=a^(2)+p^(2)` `=(2k+1)^(2)+(2lamda+1)^(2)` `=4k^(2)+4k+1+4lamda^(2)+4lamda+1` `b^(2)=4(k^(2)+lamda^(2)+k+lamda)+2 " impossilbe"` `"as L.H.S. is multiple of 4 but R.H.S is not multiple of 4 "` |
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| 9. |
On a horizontal frictionless frozen lake, a girl (36 kg) and a box (9 kg) are connected to each other by means of a rope. Initially they are 20 m apart. The girl exerts a horizontal force on the box, pulling it towards her. How far has the girl traveled when she meets the box `gt`A. 10 mB. Since there is no friction, the girl will not moveC. 16 mD. 4m |
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Answer» Correct Answer - D |
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| 10. |
Lecithin is a (A) carbohydrate (B) phospholipid (C) nucleoside (D) protein |
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Answer» Correct option (B) phospholipid Explanation: It is called phospholipid molecule consist of two fatty acids, one glycerol, one phosphate and one choline molecule, it is also called phosphatidyl choline which is amphipathic molecule or membrane lipid forming plasma membrane of the cell. |
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| 11. |
Which is a water-borne diseaseA. TuberculosisB. ChickenpoxC. MalariaD. Cholera |
| Answer» Correct Answer - D | |
| 12. |
In mammals, pleural membranes cover the lungs as well as insides of the rib cage. The pleural fluid in between the two membranes – (A) dissolves oxygen for transfer to the alveoli (B) dissolves CO2 for tranfer to the blood (C) provides partial pressure (D) reduces the friction between the ribs and the lungs |
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Answer» Correct option (D) reduces the friction between the ribs and the lungs Explanation: Pleural fluid is a serous fluid produced by normal pleural. Pleural fluid allows the pleural to slide effortlessly against earth other during ventilation. |
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| 13. |
The pH of 1.0 aqueous solution of `NaCL,CH_(3)COONa" and "NH_(4)Cl` will follow the order :A. `NaClltCH_(3)COONaltNH_(4)Cl`B. `NH_(4)ClltNaClltCH_(3)COONa`C. `NH_(4)ClltCH_(3)COONaltNaCl`D. `NaClltNH_(4)ClltCH_(3)COONa` |
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Answer» Correct Answer - B `{:(,"Order of pH","","","",""),(,"less than 7","",pH,"","More than 7"),(,NH_(4)Cl,lt,NaCl,lt,CH_(3)COONa),(,"Salt of strong","","Salt of strong","","Salt of strong"),(,"acid+weak base","","acid+strong base","","base +weak acid"):}` |
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| 14. |
A cylindrical steel rod of length 0.10 m and thermal conductivity `50 W.m^(-1) K^(-1)` is welded end to end to copper rod of thermal conductivity `400 W.m^(-1). K^(-1)` and of the same area of cross section but 0.20 m long. The free end of the steel rod is maintained at `100^(@)C` and that of the copper and at `0^(@)C`. Assuming that the rods are perfectly insulated from the surrounding, the temperature at the junction of the two rods–A. `20^(@)C`B. `30^(@)C`C. `40^(@)C`D. `50^(@)C` |
| Answer» Correct Answer - A | |
| 15. |
A plane polarized light passed through successive polarizers which are rotated by 30º with respect to each other in the clockwise direction. Neglecting absorption by the polarizers and given that the first polarizer's axis is parallel to the plane of polarization of the incident light, the intensity of light at the exit of the fifth polarizer is closest to -(A) same as that of the incident light(B) 17.5% of the incident light(C) 30% of the incident light(D) zero |
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Answer» Correct Option :- (C) 30% of the incident light Explanation :- I = I0 (cos2 φ)4 = I0 × (3/4)4 =30% of I0 |
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| 16. |
The total energy of a black body radiation source is collected for five minutes and used to heat water. The temperature of the water increases from `10.0^(@)` to 1`1.0^(@)`. The absolute temperature of the black body is doubled and its surface area halved and the experiment repeated for the same time. Which of the following statements would be most nearly correct ?A. The temperature of the water would increase from `10.0^(@)C` to a final temperature of `12^(@)C`B. The temperature of the water would increase from `10.0^(@)C` to a final temperature of `18^(@)C`C. The temperature of the water would increase from `10.0^(@)C` to a final temperature of `14^(@)C`D. The temperature of the water would increases from `10.0^(@)C` to a final temperature of `11^(@)C` |
| Answer» Correct Answer - B | |
| 17. |
A parent nucleus X is decaying into daughter nucleus Y which in turn decays to Z. The half lives of X and Y are 40000 years and 20 years respectively. In a certain sample, it is found that the number of Y nuclei hardly changes with time. If the number of X nuclei in the sample is `4 xx 10^(20)`, the number of Y nuclei present in its is–A. `2 xx 10^(17)`B. `2 xx 10^(20)`C. `4 xx 10^(23)`D. `4 xx 10^(20)` |
| Answer» Correct Answer - A | |
| 18. |
An unpolarized beam of light of intensity `I_(0)` passes through two linear polarizers making an angle of `30^(@)` with respect to each other. The emergent beam will have an intensity –A. `(3I_(0))/(4)`B. `(sqrt(3)I_(0))/(4)`C. `(3I_(0))/(8)`D. `(I_(0))/(8)` |
| Answer» Correct Answer - C | |
| 19. |
The following three objects (1) a metal tray, (2) a block of wood, and (3) a woolen cap are left in a closed room overnight. Next day the temperature of each is recorded as `T_(1), T_(2) " and " T_(3)` respectively. The likely situation isA. `T_(1) = T_(2) = T_(3)`B. `T_(3)gt T_(2) gt T_(1)`C. `T_(3) = T_(2) gt T_(1)`D. ` T_(3) gt T_(2) = T_(1)` |
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Answer» Correct Answer - A |
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| 20. |
We sit in the room with windows open. ThenA. air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is negligibleB. air pressure is nearly the same on the floor, the walls and the ceilingC. air pressure on the floor equals the weight of the air column inside the room (from floor to ceiling) per unit areaD. air pressure on the walls is zero since the weight of air acts downward |
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Answer» Correct Answer - B |
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| 21. |
An object with uniform density ρ is attached to a spring that is known to stretch linearly with applied force as shown below. When the spring-object system is immersed in a liquid of density `rho_(1)` as shown in the figure, the spring stretches by an amount `x_(1)(rho gt rho_(1))`. When the experiment is repeated in a liquid of density `rho_(2) gt rho_(1)`, the spring stretches by an amount `x_(2)`. Neglecting any buoyant force on the spring, the density of the object is A. `rho=(rho_(1)x_(1)-rho_(2)x_(2))/(x_(1)-x_(2))`B. `rho=(rho_(1)x_(2)-rho_(2)x_(1))/(x_(2)-x_(1))`C. `rho=(rho_(1)x_(2)+rho_(2)x_(1))/(x_(2)+x_(1))`D. `rho=(rho_(1)x_(2)+rho_(2)x_(1))/(x_(1)+x_(2))` |
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Answer» Correct Answer - B |
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| 22. |
When of the following class of immunoglobulins can trigger the complement cascade?A. IgAB. IgMC. IgDD. IgE |
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Answer» Correct Answer - B The complement system helps the ability of antibodies and phagocytic cells to clear pathogens from an organism. It is a part of innate immune system. It is operational via classical pathways. It is triggered by antigen bond antibody molecule preferably IgG or IgM. Although IgM is move effective |
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| 23. |
Prehistoric forms of life are found in fossils. The probability of finding fossils of more comples organisms-A. increases from lower to upper stratsB. decreases from lower to upper strataC. remains constant in each stratumD. uncertain |
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Answer» Correct Answer - A During the course of evolution simple organisms evolved first while complex organisms evolved later. Fossilization of complex organisms took later in upper strata of earth crust. |
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| 24. |
The disorders that arise when the immune system destroys self cells are called autoimmune disorders. Which of the following would be classified under this?A. rheumatoid arthritisB. asthmaC. rhinitisD. eczema |
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Answer» Correct Answer - A Rheumatoid arthritis is a chronic, systemic inflammatory disorder that may affect many tissues and organs, but principally attacks flexible joints. RA is considered a systemic autoimmune disease arises from an inappropriate immune response of the body against substances and tissues normally present in the body. |
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| 25. |
The disorders that arise when the immune system destroys self cells are called autoimmune disorders. Which of the following would be classified under this? (A) rheumatoid arthritis (B) asthma (C) rhinitis (D) eczema |
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Answer» Correct :-(A) rheumatoid arthritis Explanation :- Rheumatoid arthritis is a chronic, systemic inflammatory disorder that may affect many tissues and organs, but principally attacks flexible joints. RA is considered a systemic autoimmune disease arises from an inappropriate immune response of the body against substances and tissues normally present in the body. |
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| 26. |
If you fractionate all the organelles from the cytoplasm of a plant cell, in which one of the following sets of fractions will you find nucleic acids ?A. nucleus, mitochondria, chloroplast, cytoplasmB. nucleus, mitochondria, chloroplast, glyoxysomeC. nucleus, chloroplast, cytoplasm and peroxisomeD. nucleus, mitochondria, chloroplast, Golgi bodies |
| Answer» Correct Answer - A | |
| 27. |
A protein with 100 amino acid residues has been translated based on triplet genetic code. Had the genetic code been quadruplet, the gene that codes for the protein would have been- (A) same in size(B) longer in size by 25 % (C) longer in size by 100 % (D) shorter in size |
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Answer» Correct Option :- (B) longer in size by 25 % |
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| 28. |
If you fractionate all the organelles from the cytoplasm of a plant cell, in which one of the following sets of fractions will you find nucleic acids ? (A) nucleus, mitochondria, chloroplast, cytoplasm (B) nucleus, mitochondria, chloroplast, glyoxysome (C) nucleus, chloroplast, cytoplasm and peroxisome (D) nucleus, mitochondria, chloroplast, Golgi bodies |
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Answer» Correct Option :- (A) nucleus, mitochondria, chloroplast, cytoplasm |
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| 29. |
Which of the following biological phenomenon involves a bacteriophge ? (A) transformation (B) conjugation (C) translocation (D) transduction |
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Answer» Correct option (D) transduction Explanation: Genetic Recombination through a virus or bacteriophage is termed as Transduction. |
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| 30. |
A smear of blood from a healthy individual is stained with a nuclear stain called hematoxylin and then observed under a light microscope. Which of the following cell type would be highest in number ? (A) neutrophils (B) lymphocytes (C) eosinophils (D) monocytes |
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Answer» Correct option (A) neutrophils Explanation: Neutrophils the polymorphonuclear neutrophils (PMNs) are the most abundant white blood cells in humans. They account for approximately 50-70% of WBCs. |
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| 31. |
Two bottles A and B have radii `R_(A)` and `R_(B)` and heights `h_(A)` and `h_(B)` respectively with `R_(B) = 2R_(A)` and `h_(B) = 2h_(A)`. These are filled with hot water at `60^(@)C`. Consider that heat loss for the bottles takes place only from side surfaces. If the time the water to cool down to `50^(@)C` is `t_(A)` and `t_(B)` for the bottles A and B, respectively, then `t_(A)` and `t_(B)` are best related asA. `t_(A)=t_(B)`B. `t_(B)=2t_(A)`C. `t_(B)=4t_(A)`D. `t_(A)=t_(A)//2` |
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Answer» Correct Answer - B |
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| 32. |
Let H be the orthocenter of an acute - angled triangle ABC and O be itscircumcenter. Then `vec(HA)+vec(HB)+vec(HC)`A. is equal to `vec(HO)`B. is equal to `vec(3HO)`C. is equal to `vec(2HO)`D. is not a scalar multiple of `vec(HO)` in general |
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Answer» Correct Answer - C G ic centroid `G=(A+B+C)/(3)` `G=(20+H)/(3)` `2O+H=3G` `vec(HA)+vec(HB)+vec(HC)=vec(A)-vec(H)-vec(B)+vec(C)-vec(H)` `=vec(A)+vec(B)+vec(C)-3vec(H)` `=3vec(G)-3vec(H)` `=2vec(O)+vecH-3vec(H)` `=2vec(O)-2vec(H)` `=2vec(HO)` |
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| 33. |
For a real number x let [x] denote the largest integer les than or eqaul to x and {x} =x -[x]. Let n be a positive integer. Then`int_(0)^(1) cos(2pi[x]{x})dx` is equal to |
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Answer» Correct Answer - B `underset(0)overset(1)intcos(2pi[x]{x})dx` `=underset(0)overset(n)intcos(o)dx+underset(1)overset(2)intcos(2pi(x-1))dx+underset(2)overset(3)intcos(4pi(x-2))dx+....+underset(n-1)overset(n)intcos(2pi(n-1)(x-(n-1)))dx` `=(1-0)+underset(1)overset(2)intcos2pixdx+underset(2)overset(3)intcso4pixdt+....+underset(n-1)overset(n)intcos(2pi(n-1)x)dx` `=1+(sin2pix)/(2pi):|_(1)^(2)++(sin4pix)/(4pi):|_(2)^(3)+....+(sin2pi(n-1))/(2pi(n-1)):|_(n-1)^(n)` `1+0=1` |
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| 34. |
The value of the integral `int_(-pi)^(pi)(cos^(2)x)/(1+a^(x))"dx"`, where `a gt 0`, is -(A) ` pi ` (B) ` api ` (C) ` pi/2 ` (D) ` 2pi `A. `pi`B. `api`C. `pi//2`D. `2pi` |
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Answer» Correct Answer - C `I=int_(-pi)^(pi)(co^(2)x)/(1+a^(x))"dx…………(1) "int_(a)^(d)f(x)dx=int_(a)^(d)f(a+b-x)dx` `I=int_(-pi)^(pi)(cos^(2)(-x))/(1+a^(-x))dx` `I=int_(-pi)^(pi)(a^(x)cos^(2)x)/(1+a^(x))"dx………….(2)"` add equation (1) and (2) `2I=int_(-pi)^(pi)cos^(2)x((1)/(1+a^(2))+(a^(x))/(1+a^(x)))"dx"` `I=int_(0)^(pi)cos^(2)"x dx = 2"int_(0)^(pi//2)cos^(2)"x dx"` `=pi//2` |
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| 35. |
Suppose, a, b, c are three distinct real numbers. Let P (x) =`((x-b)(x-c))/((a-b)(a-c))+((x-c)(x-a))/((b-c)(b-a))+((x-a)(x-b))/((c-a)(c-b))`. When simplified, P (x) becomesA. 1B. xC. `(x^(2)+(a+b+c)(ab+bc+ca))/((a-b)(b-c)(c-a))`D. 0 |
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Answer» Correct Answer - A `P(x)=((x-b)(x-c))/((a-b)(a-c))+((x-c)(x-a))/((b-c)(b-a))+((x-a)(x-b))/((c-a)(c-b))` `"Let "P(a)=1+0+0=1` `P(b) =0+1+0=1` `P (c) =0+0+1=1` `:. P(x)=1 " for all "x in R`. |
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| 36. |
Suppose m, n are positive integers such that 6m + 2m+n 3w + 2n = 332. The value of the expression m2 + mn + n2 is- (A) 7 (B) 13 (C) 19 (D) 21 |
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Answer» Correct Option :-(C) 19 Explanation :- 6m + 2m+n 3w + 2n = 332 maximum possible value of m is 3 checking for m = 3, 2 and 1 we get m = 2, n = 3, w = 2 m2 + mn + n2 = 4 + 6 + 9 = 19 |
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| 37. |
The value of `int_(2pi)^(0) min{|x-pi|, cos^(-1)(cosx)} dx` is -A. `(pi^(2))/(4)`B. `(pi^(2))/(2)`C. `(pi^(2))/(8)`D. `pi^(2)` |
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Answer» Correct Answer - B `I=underset(pi//2)overset(0)intxdx + underset(pi//2)overset(pi)(int)(pi-x)dx + underset(pi)overset(3pi//2)(int)(x-pi)dx+underset(3pi//2)overset(2pi)int2pi - xdx` `(pi^(2))/(8)+(pi^(2))/(8)+(pi^(2))/(8)+(pi^(2))/(8)=(pi^(2))/(2)` |
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| 38. |
Suppose m, n are positive integers such that `6^(m) + 2^(m+n) 3^(w) + 2^(n) = 332`. The value of the expression `m^(2) + nm + n^(2)` is -(A) 7 (B) 13 (C) 19 (D) 21A. `7`B. `13`C. `19`D. `21` |
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Answer» Correct Answer - C `6^(m) + 2^(m+n) 3^(w) + 2^(n) = 332` maximum possible value of m is 3 checking for `m = 3,2` and .1 we get `m = 2, n = 3, w = 2` `m^(2) + mn + n^(2) = 4 + 6 + 9 = 19` |
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| 39. |
A couple went to a doctor and reported that both of them are "carriers" for a particular disorder, their first child is suffering from that disorder and that they are expecting their second child. What is the probability that the new child would be affected by the same disorder?A. `100%`B. `50%`C. `25%`D. `75%` |
| Answer» Correct Answer - C | |
| 40. |
A person has difficulty in breathing at higher altitudes because-A. oxygen is likely to from lungs to bloodB. oxygen is likely to diffuse from blood to lungsC. partial pressure of `O_(2)` is lower than partial pressure of `CO_(2)`D. overall intake of `O_(2)` by the blood becomes low |
| Answer» Correct Answer - C | |
| 41. |
The number of gas molecules striking per second per square meter of the top surface of a table placed in a room at `20^(@)C` and 1 atmospheric pressure is of the order of `(k_(B) = 1.4 xx10^(-23)` J/K, and the average mass of an air molecules is `5xx10^(-27)`kg)A. `10^(27)`B. `10^(23)`C. `10^(25)`D. `10^(29)` |
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Answer» Correct Answer - A |
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| 42. |
Two infinitely long parallel wires carry currents of magnitude`I_(1)` and `I_(2)` and are at a distance 4 cm apart. The magnitude of the net magnetic field is found to reach a non-zero minimum values between the two wires and 1 cm away from the first wire. The ratio of the two currents and their mutual direction isA. `(I_(2))/(I_(1))=9`, antiparallelB. `(I_(2))/(I_(1))=9`, parallelC. `(I_(2))/(I_(1))=3`, antiparallelD. `(I_(2))/(I_(1))=3`, parallel |
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Answer» Correct Answer - A |
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| 43. |
Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this? (A) The coefficient of the thermal expansion is large. (B) It is shiny. (C) It is a liquid at room temperature. (D) It has high density. |
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Answer» Correct Option :- (D) It has high density Explanation :- high density is not the reason for its uses in clinical thermometers. |
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| 44. |
In an experiment , setup A consists of two parallel wires which carry currents in opposite directions as shown in the figure. A second setup B is identical to setup A, except that there is a metal plate between the wires Let FA and FB be the magnitude of the force between the two wires in setup A and setup B, respectively(A) FA > FB ≠ 0 (B) FA < FB (C) FA = FB ≠ 0 (D) FA > FB = 0 |
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Answer» Correct Option :- (C) FA = FB ≠ 0 Explanation :- In setup B, A metal is placed, due to which metal may get magnetized and it may also exert force on current carrying wire but force between two wire remain same however net force on wire may get charge due to magnetic field produced by magnetized metal. |
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| 45. |
the major product obtained in the reaction of oxalic acid with conc, `H_(2)SO_(4)` upon heating areA. `CO,CO_(2),H_(2)O`B. `CO,SO_(2),H_(2)O`C. `H_(2)S,CO,H_(2)O`D. `HCOOH,H_(2)S,CO` |
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Answer» Correct Answer - a `underset(COOH)underset(|)(COOH)+H_(2)SO_(4)overset(Delta)toH_(2)O+(CO_(2))_(g)+CO_((g))+H_(2)SO_(4)` |
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| 46. |
The reaction `C_(2)H_(6)(g) iff C_(2)H_(4)(g)+H_(2)(g)` is at equilibrium in a closed vessel at 1000 K. The enthalpy change `(DeltaH)` for the reaction is 137.0kJ `mol^(-1)`. Which one of the following actions would shift the equilibrium to the right ?A. Decreasing the volume of the closed reaction vesselB. Decreasing the temperature at which the reaction is performedC. Adding an inert gas to the closed reaction vessel.D. Increasing the volume of the closed reaction vessel. |
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Answer» Correct Answer - D According to Lechatelier principal on increasing volume of closed vessel equilibrium will shift towards right. |
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| 47. |
Among the following compounds, the one which does NOT produce nitrogen gas upon heating isA. `(NH_(4))_(2)Cr_(2)O_(7)`B. `NaN_(3)`C. `NH_(4)NO_(2)`D. `(NH_(4))_(2)(C_(2)O_(4))` |
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Answer» Correct Answer - D `(NH_(4))_(2)Cr_(2)O_(7) to N_(2)+Cr_(2)O_(3)+H_(2)O` `2NaN_(3) to 2Na+3N_(2)` `NH_(4)NO_(2) to N_(2)+H_(2)O` `(NH_(4))_(2)C_(2)O_(4) to 2NH_(3)+H_(2)C_(2)O_(4)` |
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| 48. |
Chlorine has two naturally occuring isotopes, `""^(35)Cl " and " ""^(37)Cl`. If the atomi mass of Cl is 35.45, the ratio of natural abundance of `""^(35)Cl " and " ""^(37)Cl` is closest toA. `3.5:1`B. `3:1`C. `2.5:1`D. `4:1` |
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Answer» Correct Answer - B `Mav=(M_(1)n_(1)+M_(2)n_(2))/(n_(1)+n_(2))` `35.45=(35n_(1)+37n_(2))/(n_(1)+n_(2))` `:. n_(1):n_(2)=3:1` |
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| 49. |
The following data are obtained for a reaction, `X+Yrarr"Products"`. `{:("Expt. ",[X_(0)]//"mol ",[Y_(0)]//"mol ","rate/mol L"^(-1)s^(-1)),(1,0.25,0.25,1.0xx10^(-6)),(2,0.50,0.25,4.0xx10^(-6)),(3,0.25,0.50,8.0xx10^(-6)):}` The overall of the reaction isA. 2B. 4C. 3D. 5 |
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Answer» Correct Answer - D `r=K[X]^(x)[Y]^(y)` Total order n = x + y By exp. (1) & (2) `(r_(1))/(r_(2))=(K[.25]^(x)[.25]^(y))/(K[.50]^(x)[.25]^(y))=(1.0xx10^(-6))/(4.0xx10^(-6))` `(1)/((2)^(x))=(1)/(4),x=2` By exp. (1) & (3) `(r_(1))/(r_(2))=(K[.25]^(x)[.25]^(y))/(K[.25]^(x)[.50]^(y))=(1xx10^(-6))/(8xx10^(-6))` `(1)/((2)^(4))=(1)/(8),y=3` So Total order `=2+3=5` |
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| 50. |
Three moles of an ideal gas expands reversibly under isothermal condition form 2 L to 20 L at 300 K. The amount of heat-change (in kJ/mol) in the process is - |
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Answer» Correct Answer - D `W=-2.303"nRT log"(V_(2))/(V_(1))` `=-2.303xx3xx8.314xx10^(-3)xx300 log .(20)/(2)` `=-17.2kJ//mol` |
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