The energy of an electron in the first Bohr orbit of hydrogen atom is $$-2.18 \times 10^{-18}$$ J. Its energy in the third Bohr orbit is _____.
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The energy of an electron in the first Bohr orbit of hydrogen atom is $$-2.18 \times 10^{-18}$$ J. Its energy in the third Bohr orbit is _____.
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Which of the following statements are not correct?
A. The electron gain enthalpy of F is more negative than that of Cl.
B. Ionization enthalpy decreases in a group of periodic table.
C. The electronegativity of an atom depends upon the atoms bonded to it.
D. Al$$_2$$O$$_3$$ and NO are examples of amphoteric oxides.
Choose the most appropriate answer from the options given below:
In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one?
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ClF$$_5$$ at room temperature is a
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Among the following compounds, the one which shows highest dipole moment is
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Given below are two statements:
Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water.
Statement II: Synthetic resin method results in the formation of soluble sodium salts.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Be(OH)$$_2$$ reacts with Sr(OH)$$_2$$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following
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In the following reaction 'X' is
CH$$_3$$(CH$$_2$$)$$_4$$CH$$_3$$ $$\xrightarrow{\text{Anhy. AlCl}_3 / \text{HCl}, \Delta}$$ X (major product)
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The radical which mainly causes ozone depletion in the presence of UV radiations is :
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What happens when a lyophilic sol is added to a lyophobic sol?
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Which one of the following is most likely a mismatch?
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The incorrect statement from the following for borazine is:
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The pair of lanthanides in which both elements have high third-ionization energy is:
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The mismatched combinations are
A. Chlorophyll $$-$$ Co
B. Water hardness $$-$$ EDTA
C. Photography $$-$$ [Ag(CN)$$_2$$]$$^-$$
D. Wilkinson catalyst $$-$$ [(Ph$$_3$$P)$$_3$$RhCl]
E. Chelating ligand $$-$$ D $$-$$ Penicillamine
Choose the correct answer from the options given below.
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2-Methyl propyl bromide reacts with C$$_2$$H$$_5$$O$$^-$$ and gives 'A' whereas on reaction with C$$_2$$H$$_5$$OH it gives 'B'. The mechanism followed in these reactions and the products 'A' and 'B' respectively are:
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In the reaction given below
An amino alcohol reacts with (i) HCl (ii) KOH to give 'B' Major product. 'B' is:
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In the above reaction, left hand side and right hand side rings are named as 'A' and 'B' respectively. They undergo ring expansion. The correct statement for this process is:
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D $$-$$ (+) $$-$$ Glyceraldehyde $$\xrightarrow{\text{i) HCN}}$$ $$\xrightarrow{\text{ii) H}_2\text{O/H}^+}$$ $$\xrightarrow{\text{iii) HNO}_3}$$
The products formed in the above reaction are
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A cyclic amide (lactam) reacts with (i) NaOH, $$\Delta$$ (ii) H$$^+$$ to give 'A' (Major Product).
'A' is:
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Match the following
| Column-A | Column-B | ||
|---|---|---|---|
| a | Nylon 6 | I | Natural Rubber |
| b | Vulcanized Rubber | II | Cross Linked |
| c | cis-1, 4-polyisoprene | III | Caprolactam |
| d | Polychloroprene | IV | Neoprene |
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An organic compound gives $$0.220$$ g of CO$$_2$$ and $$0.126$$ g of H$$_2$$O on complete combustion. If the % of carbon is $$24$$ then the % of hydrogen is _____ $$\times 10^{-1}$$. (Nearest integer)
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A certain quantity of real gas occupies a volume of $$0.15$$ dm$$^3$$ at $$100$$ atm and $$500$$ K when its compressibility factor is $$1.07$$. Its volume at $$300$$ atm and $$300$$ K (When its compressibility factor is $$1.4$$) is _____ $$\times 10^{-4}$$ dm$$^3$$ (Nearest integer)
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A$$_2$$ + B$$_2$$ $$\to$$ 2AB. $$\Delta H_f = -200$$ kJ mol$$^{-1}$$
AB, A$$_2$$ and B$$_2$$ are diatomic molecules. If the bond enthalpies of A$$_2$$, B$$_2$$ and AB are in the ratio 1 : 0.5 : 1, then the bond enthalpy of A$$_2$$ is _____ kJ mol$$^{-1}$$ (Nearest integer)
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$$25.0$$ mL of $$0.050$$ M Ba(NO$$_3$$)$$_2$$ is mixed with $$25.0$$ mL of $$0.020$$ M NaF. K$$_{sp}$$ of BaF$$_2$$ is $$0.5 \times 10^{-6}$$ at 298K. The ratio of $$[\text{Ba}^{2+}][\text{F}^-]^2$$ and K$$_{sp}$$ is _____.
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KMnO$$_4$$ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H$$_2$$SO$$_4$$. Number of water molecules produced for 2 molecules of KMnO$$_4$$ is _____.
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$$20$$ mL of calcium hydroxide was consumed when it was reacted with $$10$$ mL of unknown solution of H$$_2$$SO$$_4$$. Also $$20$$ mL standard solution of $$0.5$$ M HCl containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of $$35.5$$ mL whereas the burette showed $$25.5$$ mL initially. The concentration of H$$_2$$SO$$_4$$ is _____ M. (Nearest integer)
Solution of $$12$$ g of non-electrolyte (A) prepared by dissolving it in $$1000$$ mL of water exerts the same osmotic pressure as that of $$0.05$$ M glucose solution at the same temperature. The empirical formula of A is CH$$_2$$O. The molecular mass of A is _____ g. (Nearest integer)
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A metal surface of $$100$$ cm$$^2$$ area has to be coated with nickel layer of thickness $$0.001$$ mm. A current of 2A was passed through a solution of Ni(NO$$_3$$)$$_2$$ for 'x' seconds to coat the desired layer. The value of x is _____. (Nearest integer)
($$\rho$$Ni (density of Nickel) is $$10$$ g mL$$^{-1}$$, Molar mass of Nickel is $$60$$ g mol$$^{-1}$$, F $$= 96500$$ C mol$$^{-1}$$)
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t$$_{87.5}$$ is the time required for the reaction to undergo $$87.5\%$$ completion and t$$_{50}$$ is the time required for the reaction to undergo $$50\%$$ completion. The relation between t$$_{87.5}$$ and t$$_{50}$$ for a first order reaction is
t$$_{87.5}$$ = x $$\times$$ t$$_{50}$$
The value of x is _____. (Nearest integer)
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For the given reaction
The total number of possible products formed by tertiary carbocation of A is _____.
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