The number of molecules and moles in 2.8375 litres of O$$_2$$ at STP are respectively
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The number of molecules and moles in 2.8375 litres of O$$_2$$ at STP are respectively
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The pair from the following pairs having both compounds with net non-zero dipole moment is
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The compound which does not exist is
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The enthalpy change for the adsorption process and micelle formation respectively are
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Given
(A) $$2CO(g) + O_2(g) \to 2CO_2(g)$$, $$\Delta H_1^0 = -x$$ kJ mol$$^{-1}$$
(B) $$C_{graphite} + O_2(g) \to CO_2(g)$$, $$\Delta H_2^0 = -y$$ kJ mol$$^{-1}$$
The $$\Delta H^0$$ for the reaction $$C_{graphite} + \frac{1}{2}O_2(g) \to CO(g)$$ is
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Given below are two reactions, involved in the commercial production of dihydrogen H$$_2$$. The two reactions are carried out at temperature "T$$_1$$" and "T$$_2$$", respectively
$$C(s) + H_2O(g) \xrightarrow{T_1} CO(g) + H_2(g)$$
$$CO(g) + H_2O(g) \xrightarrow{T_2, Catalyst} CO_2(g) + H_2(g)$$
The temperatures T$$_1$$ and T$$_2$$ are correctly related as
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Lime reacts exothermally with water to give 'A' which has low solubility in water. Aqueous solution of 'A' is often used for the test of CO$$_2$$, a test in which insoluble B is formed. If B is further reacted with CO$$_2$$ then soluble compound is formed. 'A' is
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Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has
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The major product 'P' formed in the given reaction is
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Match List I with List II
| List I Industry | List II Waste Generated | ||
|---|---|---|---|
| (A) | Steel plants | (I) | Gypsum |
| (B) | Thermal power plants | (II) | Fly ash |
| (C) | Fertilizer Industries | (III) | Slag |
| (D) | Paper mills | (IV) | Bio-degradable wastes |
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Which of the following is used as a stabilizer during the concentration of sulphide ores?
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Given below are two statements:
Statement I: Aqueous solution of K$$_2$$Cr$$_2$$O$$_7$$ is preferred as a primary standard in volumetric analysis over Na$$_2$$Cr$$_2$$O$$_7$$ aqueous solution.
Statement II: K$$_2$$Cr$$_2$$O$$_7$$ has a higher solubility in water than Na$$_2$$Cr$$_2$$O$$_7$$. In the light of the above statements, choose the correct answer from the options given below:
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Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to
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Which of the following statements are correct?
(A) The M$$^{3+}$$/M$$^{2+}$$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion
(C) Aqueous solution of Cr$$^{2+}$$ can liberate hydrogen from dilute acid
(D) Magnetic moment of V$$^{2+}$$ is observed between 4.4-5.2 BM
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The octahedral diamagnetic low spin complex among the following is
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Identify the correct order of reactivity for the following pairs towards the respective mechanism
(A)
(B)
(C) Electrophilic substitution
(D) Nucleophilic substitution
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Suitable reaction condition for preparation of Methyl phenyl ether is
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Isomeric amines with molecular formula C$$_8$$H$$_{11}$$N give the following tests
Isomer P $$\Rightarrow$$ Can be prepared by Gabriel phthalimide synthesis
Isomer Q $$\Rightarrow$$ Reacts with Hinsberg's reagent to give solid insoluble in NaOH
Isomer R $$\Rightarrow$$ Reacts with HONO followed by $$\beta$$-naphthol in NaOH to give red dye.
Isomers P, Q and R respectively are
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Match List-I with List-II.
| List-I Polymer | List-II Type/Class | ||
|---|---|---|---|
| A. | Nylon-2-Nylon-6 | I. | Thermosetting polymer |
| B. | Buna-N | II. | Biodegradable polymer |
| C. | Ureaformaldehyde resin | III. | Synthetic rubber |
| D. | Dacron | IV. | Polyester |
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The one that does not stabilize 2$$^\circ$$ and 3$$^\circ$$ structures of proteins is
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The number of bent-shaped molecule/s from the following is _______ N$$_3^-$$, NO$$_2$$, I$$_3^-$$, O$$_3$$, SO$$_2$$
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The sum of lone pairs present on the central atom of the interhalogen IF$$_5$$ and IF$$_7$$ is _______.
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At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is _______ mm Hg. (Nearest integer)
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$$FeO_4^{2-} \xrightarrow{+2.2 V} Fe^{3+} \xrightarrow{+0.70 V} Fe^{2+} \xrightarrow{-0.45 V} Fe^0$$
$$E^0_{FeO_4^{2-}/Fe^{2+}}$$ is $$x \times 10^{-3}$$ V. The value of x is _______.
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The number of incorrect statement/s about the black body from the following is _______.
(A) Emit or absorb energy in the form of electromagnetic radiation.
(B) Frequency distribution of the emitted radiation depends on temperature.
(C) At a given temperature, intensity vs frequency curve passes through a maximum value.
(D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.
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The number of correct statement/s involving equilibria in physical processes from the following is _______.
(A) Equilibrium is possible only in a closed system at a given temperature.
(B) Both the opposing processes occur at the same rate.
(C) When equilibrium is attained at a given temperature, the value of all its parameters became equal
(D) For dissolution of solids in liquids, the solubility is constant at a given temperature.
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In the following reaction, the total number of oxygen atoms in X and Y is _______.
Na$$_2$$O + H$$_2$$O $$\to$$ 2X
Cl$$_2$$O$$_7$$ + H$$_2$$O $$\to$$ 2Y
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If the degree of dissociation of aqueous solution of weak monobasic acid is determined to be 0.3, then the observed freezing point will be _______ % higher than the expected/theoretical freezing point. (Nearest integer).
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A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both the reactions are occurring then the time taken for the 50% consumption of the reactant is _______ min. (Nearest integer)
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In potassium ferrocyanide, there are _______ pairs of electrons in the t$$_{2g}$$ set of orbitals.
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