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The rate of a first order reaction is 0.04 mol litre-1 s-1 at 10 minutes and 0.03 mol litre-1 sec-1 at 20 minutes after initiation. The half-life of the reaction is ______ min.
Concept: undefined >> undefined
For the given first order reaction A → B the half life of the reaction is 0.3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to ______. (Nearest integer)
Concept: undefined >> undefined
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A reaction has a half-life of 1 min. The time required for 99.9% completion of the reaction is ______ min.
(Round off to the nearest integer).
[Use: In 2 = 0.69; In 10 = 2.3]
Concept: undefined >> undefined
The decomposition of N2O4 to NO2 was carried out in chloroform at 280°C. At equilibrium, 0.2 mol of N2O4 and 2 × 10−3 mol of NO2 were present in 2 ℓ of the solution. The equilibrium constant for the reaction \[\ce{N2O4 <=> 2NO2}\] is ______.
Concept: undefined >> undefined
If the weight of the non-volatile solute urea (NH2–CO–NH2) is to be dissolved in 100 g of water, in order to decrease the vapour-pressure of water by 25%, then the weight of the solute will be ______ g.
Concept: undefined >> undefined
Which of the following elements is considered a metalloid?
Concept: undefined >> undefined
Elimination of bromine from 2-bromobutane results in the formation of ______.
Concept: undefined >> undefined
The value of Kc is 64 at 800 K for the reaction \[\ce{N2(g) + 3H2(g) <=> 2NH3(g)}\].
The value of Kc for the following reaction is:
\[\ce{NH3(g) <=> 1/2N2(g) + 3/2H2(g)}\]
Concept: undefined >> undefined
In which one of the following equilibria, KP ≠ Kc?
Concept: undefined >> undefined
A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in the vessel. Kp for this reaction is ______.
Concept: undefined >> undefined
In the reaction of oxalate with permanganate in an acidic medium, the number of electrons involved in producing one molecule of CO2 is ______.
Concept: undefined >> undefined
The water having more dissolved O2 is ______.
Concept: undefined >> undefined
The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the baseline are 3.25 cm, 2.08 cm and 1.05 cm respectively. The ratio of Rf values of A to B is ______.
Concept: undefined >> undefined
The polymer containing strong intermolecular forces, e.g., hydrogen bonding, is ______.
Concept: undefined >> undefined
The polymer formed on heating Novolac with formaldehyde is ______.
Concept: undefined >> undefined
Match List - I with List - II:
| List - I (Polymer) |
List - II (used for items) |
||
| (A) | Nylon 6, 6 | (I) | Buckets |
| (B) | Low density polythene | (II) | Non-stick utensils |
| (C) | High density polythene | (III) | Bristles of brushes |
| (D) | Teflon | (IV) | Toys |
Choose the correct answer from the options given below:
Concept: undefined >> undefined
The artificial sweetener that has the highest sweetness value in comparison to cane sugar is ______.
Concept: undefined >> undefined
Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
Concept: undefined >> undefined
In chromatography, which of the following statement is INCORRECT for Rf?
Concept: undefined >> undefined
The product formed in the first step of the reaction
\[\begin{array}{cc}
\ce{Br}\phantom{......}\\
|\phantom{.......}\\
\ce{CH3-CH2-CH-CH2-CH-CH3}\\
\phantom{...............}|\\
\phantom{................}\ce{Br}
\end{array}\]
with excess Mg/Et2O(Et = C2H5) is:
Concept: undefined >> undefined
