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A commercially sold conc. HCl is $$35\%$$ HCl by mass. If the density of this commercial acid is $$1.46$$ g/mL, the molarity of this solution is : (Atomic mass : Cl $$= 35.5$$ amu, H $$= 1$$ amu)
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If the radius of the $$3^{rd}$$ Bohr's orbit of hydrogen atom is $$r_3$$ and the radius of $$4^{th}$$ Bohr's orbit is $$r_4$$. Then
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Consider the ions/molecule $$O_2^+, O_2, O_2^-, O_2^{2-}$$. For increasing bond order the correct option is
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An evacuated glass vessel weighs $$40.0$$ g when empty, $$135.0$$ g when filled with a liquid of density $$0.95$$ g mL$$^{-1}$$ and $$40.5$$ g when filled with an ideal gas at $$0.82$$ atm at $$250$$ K. The molar mass of the gas in g mol$$^{-1}$$ is : (Given : $$R = 0.082$$ L atm K$$^{-1}$$ mol$$^{-1}$$)
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The correct order of melting point is
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Given below are two statements :
Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and $$Na_2S$$.
In the light of the above statements, choose the most appropriate answer from the options given below
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Which will have the highest enol content?
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The $$\left(\frac{\partial E}{\partial T}\right)_P$$ of different types of half cells are as follows :
A: $$1 \times 10^{-4}$$, B: $$2 \times 10^{-4}$$, C: $$0.1 \times 10^{-4}$$, D: $$0.2 \times 10^{-4}$$
(Where E is the electromotive force). Which of the above half cells would be preferred to be used as reference electrode
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Given below are two statements :
Statement I : According to the Ellingham diagram, any metal oxide with higher $$\Delta G°$$ is more stable than the one with lower $$\Delta G°$$.
Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram.
In the light of the above statements, choose the most appropriate answer from the options given below
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Consider the following reaction :
$$2HSO_4^-(aq) \xrightarrow[(2) Hydrolysis]{(1) Electrolysis \atop } 2HSO_4^- + 2H^+ + A$$
The dihedral angle in product $$A$$ in its solid phase at $$110$$ K is
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The correct order of melting points of hydrides of group 16 elements is
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Consider the following reaction :
$$A + alkali \to B$$ (Major Product)
If B is an oxoacid of phosphorus with no P - H bond, then A is
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Polar stratospheric clouds facilitate the formation of
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Choose the correct stability order of group 13 elements in their $$+1$$ oxidation state.
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$$(C_7H_5O_2)_2 \xrightarrow{h\nu} [X] \to 2\dot{C}_6H_5 + 2CO_2$$
Consider the above reaction and identify the intermediate 'X'
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Consider the following reaction sequence and identify the product B.
Among the following structures, which will show the most stable enamine formation? (Where Me is $$-CH_3$$)
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Which of the following sets are correct regarding polymer:
(A) Copolymer : Buna-S
(B) Condensation polymer : Nylon-6, 6
(C) Fibres : Nylon-6, 6
(D) Thermosetting polymer : Terylene
(E) Homopolymers : Buna-N
Choose the correct answer from given options below
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A chemical which stimulates the secretion of pepsin is
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Which statement is not true with respect to nitrate ion test?
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On complete combustion $$0.30$$ g of an organic compound gave $$0.20$$ g of carbon dioxide and $$0.10$$ g of water. The percentage of carbon in the given organic compound is ______ (Nearest Integer)
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For complete combustion of methanol
$$CH_3OH(l) + \frac{3}{2}O_2(g) \to CO_2(g) + 2H_2O(l)$$
the amount of heat produced as measured by bomb calorimeter is $$726$$ kJ mol$$^{-1}$$ at $$27°$$C. The enthalpy of combustion for the reaction is $$-x$$ kJ mol$$^{-1}$$, where $$x$$ is ______
(Given : $$R = 8.3$$ J K$$^{-1}$$ mol$$^{-1}$$)
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$$50$$ mL of $$0.1$$ M $$CH_3COOH$$ is being titrated against $$0.1$$ M NaOH. When $$25$$ mL of NaOH has been added, the pH of the solution will be ______ $$\times 10^{-2}$$. (Nearest integer)
(Given : $$pK_a(CH_3COOH) = 4.76$$)
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Compound 'P' on nitration with dil. $$HNO_3$$ yields two isomers (A) and (B). These isomers can be separated by steam distillations. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. $$HNO_3$$ yields a yellow compound 'C', a strong acid. The number of oxygen atoms is present in compound 'C'
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A $$0.5$$ percent solution of potassium chloride was found to freeze at $$-0.24°$$C. The percentage dissociation of potassium chloride is (Nearest integer)
(Molal depression constant for water is $$1.80$$ K kg mol$$^{-1}$$ and molar mass of KCl is $$74.6$$ g mol$$^{-1}$$)
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A flask is filled with equal moles of A and B. The half lives of A and B are $$100$$ s and $$50$$ s respectively and are independent of the initial concentration. The time required for the concentration of A to be four times that of B is ______ s.
(Given : $$\ln 2 = 0.693$$)
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$$2.0$$ g of $$H_2$$ gas is adsorbed on $$2.5$$ g of platinum powder at $$300$$ K and $$1$$ bar pressure. The volume of the gas adsorbed per gram of the adsorbent is ______ mL
(Given : $$R = 0.083$$ L bar K$$^{-1}$$ mol$$^{-1}$$)
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The spin-only magnetic moment value of the most basic oxide of vanadium among $$V_2O_3$$, $$V_2O_4$$ and $$V_2O_5$$ is ______ B.M. (Nearest integer)
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The spin-only magnetic moment value of an octahedral complex among $$CoCl_3 \cdot 4NH_3$$, $$NiCl_2 \cdot 6H_2O$$ and $$PtCl_4 \cdot 2HCl$$, which upon reaction with excess of $$AgNO_3$$ gives 2 moles of AgCl is ______ B.M. (Nearest Integer)
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The number of oxygen present in a nucleotide formed from a base, that is present only in RNA is ______
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