Structures Of The Molecular Formula

The concentration of Zn²⁺  and Cu²⁺  in the Daniel cell is increased ten times. The emf of the cell

• Increases 10 times

• Decreases by 10 times

• Increases by 1/10 times

• Remains constant

Calculate Ʌ HOA_c using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O at 25°C

• 217.5

• 390.7

• 417.5

• 582.7

Which of the following complexes will show geometrical as well as optical isomerism ?

• [Pt(NH₃)₂Cl₂]

• [Pt(NH₃)Cl₄]

• L Pt(en)₃ l⁴⁺

• L Pt(en)₂ cl₂ l

Out of the possible structures of the molecular formula C₅H₁₁Br, how many are optically active ?

• 1

• 4

• 5

• 3

In the following benzyl/alkyl system        (R is alkyl group) the decreasing order of inductive effect is

• (CH₃)₃C - > (CH₃)₂CH- > CH₃CH₂ -

• (CH₃)₃CH₂ - > (CH₃)₂CH - > (CH₃)₃C -

• (CH₃)₂CH - > CH₃CH₂ - > (CH₃)₃C -

• (CH₃)₂C - > CH₃CH₂- > (CH₃)₃CH -

What is the equilibrium expression for the reaction   

• K_C=

• K_C=

• K_C=

• K_C=

Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They were labelled A and B for testing. A and B wereseparately taken in test tubes and boiled with NaOH solution. The end solution in each tube was made acidic withdilute HNO₃ and then some AgNO₃ solution was added. Substance B gave a yellow precipitate. Which one of thefollowing statemens is true for this experiment ?

• A was C₆H₅CH₂I

• B was C₆H₅I

• Addition of HNO₃ was unnecessary

• A was C₆H₅I

The separation of lanthanides by ion-exchange method is based on :

• Size of the ions

• Oxidation state of the ions

• The solubilities of their nitrates

• Basicity of hydroxides of Lanthanides

Which of the following will not give butyl acetate when treated with I-butanol ?

Rate of the reaction is fastest when Z is 

• Cl

• NH₂

• OC₂H₅

• OCOCH₃

Select the rate law that corresponds to the data shown for the following reaction : A + B → C

• K I B I⁴

• K [A][B]²

• K[A]² [B]²

• Rate = R[B]³

Consider the following species (1) RCH⁺CH³ (2) RCH₂CH₂⁺ (3) RCH₂CH₂⁺CHO In dehydration of 1 alcohols, the correct sequence of formation of species involved is

• 2, 1

• 1, 2

• 3, 2

• 2, 3

Amount of oxalic acid present in a solution can be determined by its titration with KMnO₄ solution in the presence of H₂SO₄. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

• Gets oxidised by oxalic acid to chlorine

• Furnishes H⁺ ions in addition to those from oxalic acid

• Reduces permanganate to Mn²⁺

• Oxidises oxalic acid to carbon dioxide and water

The reaction is described as

• S_E²

• S_N¹

• S_N⁰

• S_N²

A photon of hard gamma radiation knocks a proton out of     nucleus to form

• The isobar of

• The nuclide

• The isobar of parent nucleus

• The isotope of parent nucleus

25 ml. of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titre value of 35 ml. The molarity of barium hydroxide solution was

• 0.07

• 0.14

• 0.28

• 0.35

Which of the following is not a surfactant ?

• CH₂(CH₂)₁₅N⁺(CH₃)Br^-

• CH₃ - (CH₂)₁₄ - CH₂NH₂

• CH₃(CH₂)₁₆ - CH₂ OSO₂^- Na⁺

• OHC - (CH₂)₁₄ - CH₂ - COO^-Na⁺

The magnetic moment of a transition metal ion is 3.87 BM. The number of unpaired electrons present in it is

• 2

• 3

• 4

• 5

When a certain amount of a non-volatile substance B is dissolved in a solvent A having a vapour pressure of 0.80 atm in the pure state, the vapour pressure is lowered to 0.60 atm. The mole fraction of B in the soluton is

• 0.75

• 0.48

• 0.25

• 0.2

A mole of Argon at 506.5 kP_a expands from 10 dm³ against a constant opposing pressure of 253.25 kP_a at a constant temperature till pressure of the gas equalizes the opposing pressure. What is the work done ?

• -2533 J

• 2000 J

• 854 J

• -533 J

The equilibrium constant for the reaction HONO + CN^- = HCN + ONO^- is 1.1 x 10^-4 The magnitude of this equilibrium constant indicates that

• CN^- is weaker base than ONO^-

• HCN is weaker acid than HONO

• NO^- is the conjugate base of HONO

• The conjugate acid of CN^- is HCN.

Consider the following compounds 1. CH₃CH₂CH₂Br  2. CH₃CHBrCH₃  3. (CH₃)₃CBr   The compounds are dehydrogenated by treatment with strong base under identical conditions. The correctsequence of reactivity of these compounds in the given reaction is

• 1 > 2 > 3

• 2 > 1 > 3

• 3 > 1 > 2

• 3 > 2 > 1

List the hydrogen halide acid in decreasing order of reactivity in the following reaction ROH + HX → RX + H₂O

• HBr > HI > HCl > HF

• HI > HBr > HCl > HF

• HI > HF > HBr > HCl

• HI > HCl > HBr > HF

• 0.2

• 0.4

• 0.8

• 1

A 2° alcohol (A), having the molecular formula C₅H₁₂O, on oxidation gives a compound (B) which gives phenyl hydrazone derivative, but does not give negative Tollen’s test. The structure of the compound (A) is

• CH₃ COCH₂ CH₂ CH₃

• CH₃ CHOHCH₂ CH₂ CH₃

• CH₃ CH₂ COCH₂ CH₃

• CH₃ CH₂ CHOHCH₂ CH₃

Consider the following amines   1) n-butyl amine   2) ethyl dimethyl amine   3) diethylamine               The correct sequence of boiling point is

• 1 > 3 > 2

• 1 > 2 > 3

• 2 > 3 > 1

• 2 > 1 > 3

Polystyrene, dacron and orlon are classified respectively as

• Chain growth, step growth, step growth

• Chain growth, chain growth, step growth

• Chain growth, step growth, chain growth

• Step growth, step growth, chain growth

The oxidation number of sulphur in S₈, S₂F₂  and  H₂S  respectively are

• 0, +1, -2

• +2, +1 and -2

• 0, +1 and +2

• -2, +1, -2

If

• 2

• 1

• √2

• √2-1

The condition that the equation      has real roots that are equal in magnitude but opposite in sign is

• B² = m²

• B² = 2m²

• 2b² = m²

• None of these

If the function f(x) = x² + a/x  has a local minimum at x = 2, then the value of a is

• 8

• 16

• 18

• None of these

Suppose a, b, c are in A.P. and a², b², c² are in G.P. where a < b < c and a + b + c = 3/2, thenthe value of a is

Equation of the normal at a point on the parabola y² = 36x, whose ordinate is three times itsabscissa is

• 2x+3y+44 = 0

• 2x - 3y + 44 = 0

• 2x +3y -44 = 0

• 2x = 3y

Sum to n terms of the series 1 . 3 . 5 + 3 . 5 . 7 + 5 . 7 . 9 + ................. Is

• 8n² + 12n² - 2n - 3

• N(8n³ + 11n² - n - 3)

• N(2n³ + 8n² + 7n - 2)

• None of these

The solution of (1+y+x²y) dx + (x + x³) dy = 0 is

• Y + tan^-1 x = C

• Xy + tan^-1 x = C

• Y²- tan^-1 x = C

• X² + tan^-1 y / x = C

The number of words that can be formed by using the letters of the word MATHEMATICS that start as well as ends with T is

• 80720

• 90720

• 20860

• 37528

The solution of the differential equation (x+y) dy - (x - y) dx = 0 is

• Y² + 2xy + x² = k

• Y² + 2xy + x² = k

• Y² +2xy + x² = 0

• Y² - 2xy + x² = k

Let A and B be two 2 X 2 matrices. Consider the statements :  i) AB= O A = O  or  B = O  ii)  AB =I₂   A = B^-1  iii) (A + B)² = A² + 2AB + B²        In this case

• (i) is false but (ii) and (iii) are true

• (i) and (iii) are false but (ii) is true

• (i) and (ii) are false but (iii) is true

• (ii) and (iii) are false but (i) is true

If p ≠ 0 , the solution set of the equation is   is

• {1, 2}

• {2, 3}

• {1, p, 2}

• {1, 2, -p}

If I = ,  then I equals

If  , then the numerical value of K is equal to

• 1/2

• 1/4

• 1/8

• 1/18

The greatest value of f(x) = 2 sin x + sin²x in    is

• 9/2

• 5/2

• 3/2

The number of solutions of the pair of equations 2sin²Ө - cos 2Ө=0  and  2cos²Ө - 2sinӨ=0 in the interval  is

• 0

• 1

• 2

• 4

Which one do you like?

Let the line lies on the plane   lies on the plane   equals

• (6, -17)

• (-6, 7)

• (5, -15)

• (-5, 15)

The lines    intersect for

• λ =1, μ=1

• λ =2, μ=3

• All values of λ and μ

• No value of λ and μ

For    equals to

• E

• E^-1

• E^-5

• E⁵

If x⁶y² = (x+y)⁸, then  is equal to

• X/y

• Y/x

• 1

• -y/x