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Q1When OH groups strongly attached with SiO2 derivatives a)Acidic strength inc b)acidic strength remains same c)basic strength inc d)cataytic activity inc Q2Due to availabltiy of lewis acid and bronsted in sites of natural ma ...
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1)SO2Cl2 Paramagnetic 2)K2HgI4+NaOH Refrigeration 3)Flourocarbons Testing NH3 4)NO H-bondidng ...
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*Image* a unoform magnetic filed of intensity 1T is appiled in a circular region of radius 0.1m directed in the plane of the paper . a charged particle of mass 5x10^-5 kg nd charge q=5x10^-4C enters the field with a velocity ...
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can magnification due to convex mirror be negaive ?????(for both real and virtual objects) ...
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*Image* an object is placed in medium 1 of refractive index n1 and height h1,above that there is another medium of the refractive index n2and height h2. and( n2>n1). and there is air around them i.e. above medium 1 nd belo ...
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Find the emf induced across the ends P and Q of the conducting circular loop moving with a velocity (v) in the given magnetic region which has uniform magnetic field (B) directed into the plane of the screen!! *Image* ...
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A catalyst decreases the activation energy of the rxn A→B (reversible) by 2%. ΔH = 37.02 Kcal. At 300 K, 4*10-8% molecules of B are able to cross over the potential energy barrier in absence of catalyst. How many times the ...
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1) A tap supplies water at 22°C . A man takes 1 litre per minute at 37°C from the geyser. Show that the power of the geyser is 1050W. 2) A servo stabilizer restricts voltage output to 220V±1 %. If an electric bulb 100W / 2 ...
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one end of a light spring of natural length d & spring constant k(=mg/d) is fixed on a rigid support& the other end is fixed to a smooth ring of mass m which can slide without friction on a vertical rod fixed at a distance d ...
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we all know that when reacted with alkyl halide KCN forms cyanide AgCN forms isocyanide and KNO2 forms alkyl nitrite AgNO2 forms nitroalkane the difference is 'cos CN and ONO are ambident nucleophiles Can anyone pls tell me t ...
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Two small equally charged spheres each of mass m are suspended from the same point by silk threads of length l. The distance between the spheres is x<<l . find the rate dq/dt with which the charge leaks off each sphere ...
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The compound(s) formed upon combustion of sodium metal in excess air is(are) (A)Na2O2 (B)Na2O (C)NaO2 (D)NaOH ...
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The correct acidity order of the following is *Image* (A)III>IV>II>I (B)IV>III>I>II (C)III>II>I>IV (D)II>III>IV>I ...
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The Henry's law constant for the solubility of N2 gas in water at 298 K is 1.0×105 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 from air dissolved in 10 moles of water at 298 K and 5 atm pressur ...
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The IUPAC name of the following compound is *Image* (A)4-Bromo-3-cyanophenol (B)2-Bromo-5-hydroxybenzonitrile (C)2-cyano-4-hydroxybromobenzene (D)6-bromo-3-hydroxybenzonitrile ...
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plz help me how to proceed stepwise in the following questions - 1.what is the sum of the series 12-22+32-42+...-20082+20092 2.sum of the series 1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+....upto 20 terms is ?? 3.The positive intege ...
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Q. Find the equation of the circle circumscribing the triangle formed by the lines :x+y=6 , 2x+y=4, and x+2y=5 , without finding the vertices of the triangle? ...
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*Image* Is keto- prefix.. allowed?? ...
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f(x)=x2 -2x-a2 +1 g(x)=x2 -(a2 +a+1)x+a2 +a Q1. The number of values of a for which f(x)=0 and g(x)=0 have exactly one common root. Q2. The range of a for which the bigger root of g(x)=0 is greater than the bigger root of f(x ...
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Two carbon discs of 1.0 g each are 1.0 cm apart have equal and opposite charges. If forces of attraction between them is 1.0*10-5 N. calculate the ratio of excess electrons to total atom on the negatively charged disc. (permi ...
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The number of ordered pairs (a,b) such that the equations ax+by=1 and x2 +y2 =50 have all solutions integral ??? ...
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Two carbon discs of 1.0 g each are 1.0 cm apart have equal and opposite charges. If forces of attraction between them is 1.0*10-5 N. calculate the ratio of excess electrons to total atom on the negatively charged disc. (permi ...
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The number of ordered pairs (a,b) such that the equations ax+by=1 and x2 +y2 =50 have all solutions integral ??? ...
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f(x)=x2 -2x-a2 +1 g(x)=x2 -(a2 +a+1)x+a2 +a Q1. The number of values of a for which f(x)=0 and g(x)=0 have exactly one common root. Q2. The range of a for which the bigger root of g(x)=0 is greater than the bigger root of f(x ...
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this is our great nishant bhaiyya i start this thread to count on the number of nishant bhaiyyas fans plzzz reply......... *Image* ...
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Q1. Two particles 1and 2 move with constant velocities v1 and v2 .At the initial moment their radius vectors are equal to r1 and r2. How should these four vectors be interrelated for the particles to collide? I could not unde ...
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Consider a elevator accelerating upward with 2.4m/s2. Inside the elevator there is a ball of mass 1kg tied to the ceiling using a massless string. The elevator travels 30m up and then the string breaks and the ball is let loo ...
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NAME THEM AS NUCLEOPHIL N ELECTROPHILE CH3COO- SIF4 HCL ...
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WHY C-C & C=C BOND LENGTH DIFF IN 1,3CYCLOHEXADIENE ...
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Full form of A.B.C.D.E.F.G. A Boy Can Do Everything For Girl :P But its reverse. G.F.E.D.C.B.A. Try to give its full form (no negative marking) .................................... Just joikng ;) ...
