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What volume of M/10, 250 mL and M/30, 750 mL solutions of NaOH should be mixed to prepare 1 L of NaOH solution whose 300 mL is completely neutralized by 10 mL of 0.5 M H3PO4 solution. [Assuming 100% dissociation]CorrectIncorrect
Which species has the maximum number of lone pair of electrons on the central atom?CorrectIncorrect
The lysine and glutamine may be combined to give two dipeptides. Which of the following combinations represents dipeptides?CorrectIncorrect
A hydrogenation reaction is carried out at 500 K. If the same reaction is carried out in presence of a catalyst at the same rate, the temperature required is 400 K. Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20 kJ mol−1.CorrectIncorrect
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. Compound F isCorrectIncorrect
Which is the final product in the above sequence of reaction?CorrectIncorrect
Assertion: The reaction between phenol and benzoyl chloride in presence of NaOH is called Dow’s process.
Reason : Phenol on reaction with CCl4 in presence of KOH forms salicylic acid.CorrectIncorrect
Statement-1: N-methyl benzylamine can not be prepared by Gabriel- Phthalimide synthesis.
Statement-2:Gabriel-Phthalimide synthesis involves attack of phthalimide ion on suitable alkyl halide.CorrectIncorrect
Statement-1: Froth floatation method is used for benefication of gelena tough ZnS is present as impurity
Statement-2: NaCN or KCN solution is very good depresseant to supress the floating property of PbSCorrectIncorrect
Question numbers 11 to 13 are based on following paragraph.
In hexagonal systems of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space-filling model of this structure, called hexagonal close-packed (HCP), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these there spheres touches three spheres of the bottom layer. Finally, the second layer is covered with third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be ‘r’.
The number of atoms in the HCP unit cell isCorrectIncorrect
The volume of this HCP unit cell is –CorrectIncorrect
The empty space in this HCP unit cell isCorrectIncorrect
Question numbers 14 to 16 are based on following paragraph.
An aqueous solution of NaCl on electrolysis gives H2(g), Cl2(g) and NaOH according to reaction.
2Cl−1 (aq) + 2H2O → 2OH−(aq) + H2(g) + Cl2(g)
A direct current of 25 ampere with a current efficiency of 62% is passed through 20 litre of NaCl solution (20% by weight)
Reaction taking place at cathode and at anode respectively are:CorrectIncorrect
Time required to produce 1 kg of Cl2 isCorrectIncorrect
Molarity of solution with respect to OH− ions is −CorrectIncorrect
A sample of mixture of A(g), B(g) and C(g) under equilibrium has mean molecular mass equal to 80g/mole. The equilibrium is:
A(g) ⇌ B(g) + C(g)
If initially 4 mole of ‘A’ gas is present, then total number of mole of equilibrium is [MA = 100, MB = 60, MC = 40]CorrectIncorrect
In the titration of a solution of a weak acid HX with NaOH, the pH is 5.8 after 10.0 mL of NaOH solution has been added and 6.402 after 20.0 mL of NaOH has been added. What is the pka of HX?CorrectIncorrect
Match each of the diatomic molecules in Column I with its property/properties in Column II.
Column I Column II
(A) B2 (p) Paramagnetic
(B) N2 (q) Undergoes oxidation
(C) O2− (r) Undergoes reduction
(D) O2 (s) Bond order ≥ 2
(t) Mixing of ‘s’ and ‘p’ orbitalCorrectIncorrect
Match the chemical substances in Column I with type of polymers/type of bonds in Column II.
Column I Column II
(A) cellulose (p) Natural polymer
(B) nylon-6, 6 (q) Synthetic polymer
(C) protein (r) Amide linkage
(D) sucrose (s) Glycoside linkageCorrectIncorrect