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Given below are two statements:
Statement I : Bohr's theory accounts for the stability and line spectrum of Li$$^+$$ ion.
Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below:
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The first ionization energy of magnesium is smaller, as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :
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The oxidation states of nitrogen in NO, NO$$_2$$, N$$_2$$O and NO$$_3^-$$ are in the order of :
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In basic medium, H$$_2$$O$$_2$$ exhibits which of the following reactions?
(A) Mn$$^{2+} \rightarrow$$ Mn$$^{4+}$$
(B) I$$_2 \rightarrow$$ I$$^-$$
(C) PbS $$\rightarrow$$ PbSO$$_4$$
Choose the most appropriate answer from the options below :
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Match list-I with list-II :
| (a) | Be | (i) | Treatment of cancer |
| (b) | Mg | (ii) | Extraction of metals |
| (c) | Ca | (iii) | Incendiary bombs and signals |
| (d) | Ra | (iv) | Windows of X-ray tubes |
| (v) | Bearings for motor engines |
Choose the most appropriate answer, the option given below :
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Given below are two statements :
Statement I : C$$_2$$H$$_5$$OH and AgCN both can generate nucleophile.
Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions.
Choose the most appropriate option :
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In the following molecules,
Hybridisation of carbon a, b and c respectively are :
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Consider the given reaction, percentage yield of :
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Given below are two statements :
Statement I : Non-biodegradable wastes are generated by the thermal power plants.
Statement II : Bio-degradable detergents leads to eutrophication.
In the light of the above statements, choose the most appropriate answer from the option given below:
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The oxide that shows magnetic property is:
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A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a / an :
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The charges on the colloidal CdS sol and TiO$$_2$$ sol are, respectively :
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Match list-I with list-II :
| List-I | List-II | |
|---|---|---|
| (a) Mercury | (i) | Vapour phase refining |
| (b) Copper | (ii) | Distillation refining |
| (c) Silicon | (iii) | Electrolytic refining |
| (d) Nickel | (iv) | Zone refining |
Choose the most appropriate answer from the option given below:
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The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO$$_4$$ . 5H$$_2$$O, respectively, are :
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Main Products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are:
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Consider the above reaction, the product X and Y respectively are :
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In the reaction of hypobromite with amide, the carbonyl carbon is lost as:
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An organic compound A on treatment with benzene sulfonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :
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Match List - I with List - II :
| List-I (Class of Chemicals) | List-II (Example) | |
|---|---|---|
| (a) Antifertility drug | (i) | Meprobamate |
| (b) Antibiotic | (ii) | Alitame |
| (c) Tranquilizer | (iii) | Norethindrone |
| (d) Artificial Sweetener | (iv) | Salvarsan |
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Deficiency of vitamin K causes :
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Consider the above reaction where 6.1 g of benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The percentage yield of the product is ___.
(Round off to the Nearest integer)
[Given : Atomic masses : C = 12.0 u, H : 1.0 u, O : 16.0 u, Br = 80.0 u]
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The number of species below that have two lone pairs of electrons in their central atom is ___ (Round off to the Nearest integer)
SF$$_4$$, BF$$_4^-$$, ClF$$_3$$, AsF$$_3$$, PCl$$_5$$, BrF$$_5$$, XeF$$_4$$, SF$$_6$$
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The gas phase reaction
$$2 A(g) \rightleftharpoons A_2(g)$$
at 400 K has $$\Delta G^\circ = +25.2$$ kJ mol$$^{-1}$$.
The equilibrium constant $$K_C$$ for this reaction is ___ $$\times 10^{-2}$$. (Round off to the Nearest integer)
Use : $$R = 8.3$$ J mol$$^{-1}$$ K$$^{-1}$$, ln 10 = 2.3, $$\log_{10} 2 = 0.30$$, 1 atm = 1 bar
antilog(-0.3) = 0.501
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The solubility of CdSO$$_4$$ in water is $$8.0 \times 10^{-4}$$ mol L$$^{-1}$$. Its solubility in 0.01 M H$$_2$$SO$$_4$$ solution is ___ $$\times 10^{-6}$$ mol L$$^{-1}$$ (Round off to the Nearest integer) (Assume that solubility is much less than 0.01 M)
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10.0 ml of Na$$_2$$CO$$_3$$ solution is titrated against 0.2 M HCl solution. The following values were obtained in 5 readings. 4.8 ml, 4.9 ml, 5.0 ml, 5.0 ml and 5.0 ml
Based on these readings, and convention of titrimetric estimation of concentration of Na$$_2$$CO$$_3$$ solution is ___ mM.
(Round off to the Nearest integer)
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A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52$$^\circ$$C. The percentage association of A is ___.
(Round off to the Nearest integer)
Use : K$$_b$$ for water = 0.52 K kg mol$$^{-1}$$
Boiling point of water = 100$$^\circ$$C
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The molar conductivity at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860, 426 Scm$$^2$$mol$$^{-1}$$ respectively. The molar conductivity at infinite dilution of barium sulphate is ___ Scm$$^2$$ mol$$^{-1}$$ (Round off to the Nearest Integer).
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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 : ln 2 = 0.69, ln 10 = 2.3]
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A xenon compound A upon partial hydrolysis gives XeO$$_2$$F$$_2$$. The number of lone pair of electrons present in compound A is ___ (Round off to the Nearest integer)
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In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH$$_3$$)$$_2$$]$$^+$$ per aldehyde group to form silver mirror is ___. (Round off to the Nearest integer)
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