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Chemistry 13_Objective_Phase I to VI_Paper_2

PAPER – III     The value of the Vander Waal’s constant ‘a’ for the gases O2, N2, NH3 and CH4 are 1.36, 1.39, 4.17 and 2.253 unit respectively. The gas which can be liquefied most easily is (A) O2                                                              (B) N2 (C) NH3                                                           (D) CH4   Number of atoms of calcium that will be […]

Chemistry 13_Objective_Phase I to VI_Paper_1

PAPER – I     17g of hydrogen peroxide is present in 1120 ml of solution. This solution is called (A) 5 volume solution                                      (B) 10 volume solution (C) 15 volume solution                                    (D) 16 volume solution   The density of a gas at 27°C and 1 atm is d. Pressure remaining constant, at which of […]

Chemistry 13_Objective_Paper Phase I to VI

PAPER – I   A radioactive isotope having a half-life of 3 days was received after 12 days. It was found that there were 3g of the isotope in the container. The initial weight of the isotope when packed was (A) 12g                                                            (B) 24g (C) 36g                                                            (D) 48g   Which one has peroxide linkage? (A) […]

Chemistry Objective_Questions Phase I to III

The hardness of water is usually expressed in (A) ppm                                                           (B) g/litre (C) mol/litre                                                     (D) litre/gm   Avogadro’s number is the no. of molecules present in (A) 22.4 litre of a gas at NTP                          (B) 1 mole of a substance (C) g mole weight of a substance                   (D) All   How many g of glucose […]

Chemistry Miscellaneous Questions

CHEMISTRY   Which of the following substances can be used for drying of gases: (A) P2O5                                                          (B) H2SO4 (C) CaO                                                          (D) All   10 g of a piece of marble was put into excess of dilute HCl acid. When the reaction was complete, 1120 cm3 of CO2 was obtained at STP. The percentage purity of […]

Simple Harmonic Motion – Questions and solutions

Chemical Kinetics (Subjective Unsolved)   The nuclei of two isotopes of same substance A-236 & A-234 are present in 4:1 ratio in an ore obtained from some other planet. The half-lives are 30 minute and 60 minute respectively. Both isotopes are a-emitter. Calculate after how much time their activity will be identical and also calculate […]

Chemistry Test 4 with solutions

Illustration 1:          The set with correct order of acidity is                               (A)  HClO < HClO2 < HClO3 < HClO4 (B)  HClO4 < HClO3 < HClO2 < HClO                               (C)  HClO <HClO4 < HClO2 < HClO3  (D)  HClO4 <HClO2 < HClO3 <HClO Solution:              Higher the oxidation states of the central atom, higher the acidic character.                               \ […]

Chemistry Test 3 with solutions

Illustration 1:          Which one of the following does not of dissolve in conc. H­2SO4?                               (A) CH3 – C = C – CH3                     (B)  CH3 – CH2 – C º CH                               (C) CH º CH                                   (D)  CH2 = CH2 Solution:              If CH º CH were to dissolve in H2SO4 a bisulphite salt of vinyl […]

Chemistry Test 2 with solutions

    Illustration 1:          One mole of a mixture of CO and CO2 requires exactly 20 gms of NaOH to convert all the CO2 into Na2CO3. How many more gms of NaOH would it require for conversion into Na2CO3 if the mixture (one mole) is completely oxidised to CO2.                               (A)  60 gm                                       (B)  80 […]

Hydrocarbons Questions and solutions

Solved SUbjectives Problem 5:       When treated with Br2 and H2O allyl bromide chiefly the primary alcohol CH2BrCH2OH, in contrast to propylene which gives a secondary alcohol CH3CHOHCH2Br. Explain. Solution:        In the intermediate   * carbon can’t stabilize the positive charge as it is close to the electronegative Br atom, and hence attack of the OH– […]

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