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The density of 'x' M solution ('X' molar) of NaOH is $$1.12 \text{ g mL}^{-1}$$, while in molality, the concentration of the solution is $$3 \text{ m (3 molal)}$$. Then $$x$$ is (Given : Molar mass of NaOH is $$40 \text{ g/mol}$$)
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The electron affinity values are negative for A. $$\text{Be} \rightarrow \text{Be}^-$$ B. $$\text{N} \rightarrow \text{N}^-$$ C. $$\text{O} \rightarrow \text{O}^{2-}$$ D. $$\text{Na} \rightarrow \text{Na}^-$$ E. $$\text{Al} \rightarrow \text{Al}^-$$. Choose the most appropriate answer from the options given below :
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Which of the following material is not a semiconductor.
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Match List I with List II
Choose the correct answer from the options given below:
Match List I with List II
Choose the correct answer from the options given below:
Match List I with List II
Choose the correct answer from the options given below:
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At $$-20°C$$ and 1 atm pressure, a cylinder is filled with equal number of $$H_2$$, $$I_2$$ and $$HI$$ molecules for the reaction $$H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$$, the $$K_p$$ for the process is $$x \times 10^{-1}$$. $$x =$$ _______ [Given : $$R = 0.082 \text{ L atm K}^{-1} \text{mol}^{-1}$$]
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Functional group present in sulphonic acids is :
Which of the following statements are correct?
A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.
B. Aniline can be purified by steam distillation as aniline is miscible in water.
C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.
D. An organic compound is pure, if mixed M.P. is remained same.
Choose the most appropriate answer from the options given below :
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Which of the following is metamer of the given compound (X)?
Given below are two statements: Statement I : Gallium is used in the manufacturing of thermometers. Statement II : A thermometer containing gallium is useful for measuring the freezing point of brine solution (256 K). In the light of the above statements, choose the correct answer from the options given below :
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A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will -
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The number of elements from the following that do not belong to lanthanoids is $$Eu, Cm, Er, Tb, Yb$$ and $$Lu$$
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Match List I with List II
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The following complexes $$[CoCl(NH_3)_5]^{2+}$$ (A), $$[Co(CN)_6]^{3-}$$ (B), $$[Co(NH_3)_5(H_2O)]^{3+}$$ (C), $$[Cu(H_2O)_4]^{2+}$$ (D). The correct order of A, B, C and D in terms of wavenumber of light absorbed is :
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Given below are two statements : Statement I : Picric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. $$HNO_3$$ to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below :
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In Reimer - Tiemann reaction, phenol is converted into salicylaldehyde through an intermediate. The structure of intermediate is _____
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Which among the following aldehydes is most reactive towards nucleophilic addition reactions?
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Match List I with List II
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DNA molecule contains 4 bases whose structures are shown below. One of the structures is not correct, identify the incorrect base structure.
Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is _______ $$\times 10^{13}$$ Hz (nearest integer). [Given : $$R_H$$ (Rydberg constant) $$= 2.18 \times 10^{-18}$$ J, $$h$$ (Planck's constant) $$= 6.6 \times 10^{-34}$$ J.s.]
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Number of molecules from the following which can exhibit hydrogen bonding is _______ (nearest integer):
An ideal gas, $$\bar{C}_v = \frac{5}{2}R$$, is expanded adiabatically against a constant pressure of 1 atm until it doubles in volume. If the initial temperature and pressure is $$298 \text{ K}$$ and $$5 \text{ atm}$$, respectively then the final temperature is _______ K (nearest integer). [$$\bar{C}_v$$ is the molar heat capacity at constant volume]
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The major product of the following reaction is $$P$$. $$CH_3C \equiv C-CH_3 \xrightarrow[\text{(ii) dil. KMnO}_4, 273\text{ K}]{\text{(i) Na/liq. NH}_3} P$$. Number of oxygen atoms present in product '$$P$$' is _______ (nearest integer)
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Consider the dissociation of the weak acid HX as given below $$HX(aq) \rightleftharpoons H^+(aq) + X^-(aq)$$, $$K_a = 1.2 \times 10^{-5}$$ [$$K_a$$ : dissociation constant]. The osmotic pressure of $$0.03$$ M aqueous solution of HX at $$300 \text{ K}$$ is _______ $$\times 10^{-2}$$ bar (nearest integer). [Given : $$R = 0.083 \text{ L bar mol}^{-1} \text{K}^{-1}$$]
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Time required for 99.9% completion of a first order reaction is _______ times the time required for completion of 90% reaction. (nearest integer)
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Among $$CrO$$, $$Cr_2O_3$$ and $$CrO_3$$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is _______ $$\times 10^{-2}$$ BM (nearest integer). (Given atomic number of Cr is 24)
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The difference in the 'spin-only' magnetic moment values of $$KMnO_4$$ and the manganese product formed during titration of $$KMnO_4$$ against oxalic acid in acidic medium is _______ BM. (nearest integer)
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The major products from the following reaction sequence are product A and product B. The total sum of $$\pi$$ electrons in product A and product B are _______ (nearest integer)
$$9.3 \text{ g}$$ of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/conversion) is _______ g. (nearest integer)
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