A cord is wound around the circumference of a wheel of radius r.
A cord is wound around the circumference of a wheel of radius r. The axis of the wheel is horizontal... View Article
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The trajectory of a projectile in a vertical plane is y = αx – βx2, where α and β are constants and x and y, are respectively
The trajectory of a projectile in a vertical plane is y = αx – βx2, where α and β are... View Article
A tuning fork A of unknown frequency produces 5 beats/sec with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?
a. 342 Hz b. 335 Hz c. 338 Hz d. 345 Hz Answer: (b) Given Before filing: So, the answer... View Article
The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is 1.0×10–3 s–1 and the activation energy Ea = 11.488 kJ mol–1, the rate constant at 200 K is __________×10–5 s–1.(Round off to the Nearest Integer).
Answer: 10 \(\begin{array}{l}log\frac{K_{2}}{K_{1}}= \frac{E_{a}}{2.303R}\left [ \frac{1}{T_{1}} = \frac{1}{T_{2}}\right]\end{array} \) \(\begin{array}{l}log\frac{1.0\times 10^{-3}s^{-1}}{K_{1}}=\frac{11.488\times 1000}{2.303\times 8.314}\left [\frac{1}{200}- \frac{1}{300}\right ]\end{array} \) \(\begin{array}{l}log\frac{10^{-3}}{K_{1}}=600\times \frac{3-2}{600}\end{array} \)... View Article
Two salts A2X and MX have the same value of solubility product of 4.0×10–12. The ratio of their molar solubilities i.e. [latex]frac{S(A_{2}X)}{S(MX)}[/latex] = _____________. (Round off to the Nearest Integer).
Answer: 50 A2X(s) ⇌ 2A+(aq) + X2–(aq) Solubility: (x) mole / L (2x) (x) ⇒ Ksp = 4 × 10–12... View Article
A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm–3The molarity of the solution is __________ mould m–3 (Round off to the Nearest Integer).
[Atomic masses : K : 39.0 u; O: 16.0 u; H: 1.0 u] Answer: 9 \(\begin{array}{l}m = \frac{1000\times M}{1000\times d-M\times... View Article
For the reaction A(g) ⇌ B(g) at 495 K, ΔrGo = –9.478 kJ mol–(1)
If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of... View Article
The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3.4NH3 is __________. (Round off to the nearest Integer).
Answer: 2 COCl3 .4NH3 or [CO(NH3)4Cl2]Cl
A certain element crystallizes in a bcc lattice of unit cell edge length 27Å. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in Å will be _________. (Round off to the Nearest Integer).
[Assume each lattice point has a single atom] [Assume √3 = 1.73, √2 = 1.41] Answer: 33 For BCC unit... View Article
AB2 is 10% dissociated in water to A2+ and B–. The boiling point of a 10.0 molal aqueous solution of AB2 is ____________ oC. (Round off to the Nearest Integer)
[Given: Molal elevation constant of water Kb = 0.5 K kg mol–1 boiling point of pure water = 100oC] Answer:... View Article
Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organic compounds is 15.3 and _______ respectively. (Round off to the Nearest Integer).
Answer: 3 Liebig method: % of H-element = \(\begin{array}{l}\frac{2}{18}\times \frac{Mass\: of\: H_{2}O}{Mass\: of\: compound} \times 100\end{array} \) = \(\begin{array}{l}\frac{2}{18}\times \frac{210}{750}... View Article
If the equation below is balanced with integer coefficients, the value of c is__________. (Round off to the nearest integer)
If the equation below is balanced with integer coefficients, the value of c is__________. (Round off to the nearest integer)... View Article
The functions of antihistamine are:
a. Antiallergic and Analgesic b. Antacid and antiallergic c. Antiallergic and antidepressant d. Analgesic and antacid Answer: (b) Based on... View Article
The process that involves the removal of sulphur from the ores is:
a. Refining b. Roasting c. Smelting d. Leaching Answer: (b) Roasting removes S as SO2 S + O2 → SO2
Match List – I with List – II:Name of oxo acid, Oxidation state of ‘P’
Match List – I with List – II: List-I Name of oxo acid List-II Oxidation state of ‘P’ (a) Hypophosphorous... View Article
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A: The H–O–H bond angle in a water molecule is 104.5o Reason R: The lone pair – lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion.
In the light of the above statements, choose the correct Ans: from the options given below: a. A is false... View Article
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion... View Article
Given below are two statements: Statement I: Both CaCl2.6H2O and MgCl2.8H2O undergo dehydration on heating. Statement II: BeO is amphoteric whereas the oxides of other elements in the same group are acidic.
a. Statement I is true but statement II is false b. Both Statement I and Statement II are false c.... View Article
Given below are two statements: Statement I: The Eo value for Ce4+/Ce3+ is +1.74 V. Statement II: Ce is more stable in Ce4+ state than Ce3+ state.
a. Both Statement I and Statement II are correct b. Statement I is incorrect but statement II is correct c.... View Article
Match List – I with List – II:Industrial process Application Haber’s process
Match List – I with List – II: List-I Industrial process List-II Application (a) Haber’s process (i) HNO3 synthesis (b)... View Article
