The correct set of four quantum numbers for the valence electron of rubidium atom $$(Z = 37)$$ is:
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The correct set of four quantum numbers for the valence electron of rubidium atom $$(Z = 37)$$ is:
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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The first ionisation enthalpy decreases across a period.
Reason R: The increasing nuclear charge outweighs the shielding across the period.
In the light of the above statements, choose the most appropriate from the options given below:
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Which of the following is not correct?
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Chlorine undergoes disproportionation in alkaline medium as shown below :
$$aCl_2(g) + bOH^-(aq) \rightarrow cClO^-(aq) + dCl^-(aq) + eH_2O(l)$$
The values of $$a, b, c$$ and $$d$$ in a balanced redox reaction are respectively :
$$KMnO_4$$ decomposes on heating at $$513$$ K to form $$O_2$$ along with
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Given below are two statements :
Statement I : The electronegativity of group 14 elements from Si to Pb gradually decreases.
Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements.
In the light of the above statements, choose the most appropriate from the options given below :
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The interaction between $$\pi$$ bond and lone pair of electrons present on an adjacent atom is responsible for
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The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is:
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Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $$FeSO_4$$ in presence of concentrated $$H_2SO_4$$ indicates the presence of element/s
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Identify product A and product B
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The major product (P) in the following reaction is
The arenium ion which is not involved in the bromination of Aniline is
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The final product A formed in the following multistep reaction sequence is:
Identify the incorrect pair from the following :
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In chromyl chloride test for confirmation of $$Cl^-$$ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and $$10\% H_2O_2$$ turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is
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In alkaline medium, $$MnO_4^-$$ oxidises $$I^-$$ to
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In which one of the following metal carbonyls, CO forms a bridge between metal atoms?
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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.
Reason R : Phenols react with halogen acids violently.
In the light of the above statements, choose the most appropriate from the options given below:
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Type of amino acids obtained by hydrolysis of proteins is :
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Match List I with List II
Choose the correct answer from the options given below:
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Number of compounds with one lone pair of electrons on central atom amongst following is _______
$$O_3, H_2O, SF_4, ClF_3, NH_3, BrF_5, XeF_4$$
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The number of species from the following which are paramagnetic and with bond order equal to one is _______
$$H_2, He_2^+, O_2^+, N_2^{2-}, O_2^{2-}, F_2, Ne_2^+, B_2$$
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For the reaction $$N_2O_4(g) \rightleftharpoons 2NO_2(g)$$, $$K_p = 0.492$$ atm at $$300$$ K. $$K_c$$ for the reaction at same temperature is _______ $$\times 10^{-2}$$. (Given: $$R = 0.082$$ L atm mol$$^{-1}$$ K$$^{-1}$$)
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Number of compounds among the following which contain sulphur as heteroatom is _______.
Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine
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Consider the given reaction. Trans-2-butene $$\xrightarrow{(i) O_3}$$ $$\xrightarrow{(ii) Zn/H_2O}$$ (P)
The total number of oxygen atoms present per molecule of the product (P) is _______.
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A solution of $$H_2SO_4$$ is $$31.4\%$$ $$H_2SO_4$$ by mass and has a density of $$1.25$$ g/mL. The molarity of the $$H_2SO_4$$ solution is M (nearest integer) [Given molar mass of $$H_2SO_4 = 98$$ g mol$$^{-1}$$]
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The osmotic pressure of a dilute solution is $$7 \times 10^5$$ Pa at $$273$$ K. Osmotic pressure of the same solution at $$283$$ K is _______ $$\times 10^4$$ Nm$$^{-2}$$. (Nearest integer)
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The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of $$0.015$$ A for $$15$$ minutes is _______ $$\times 10^{-4}$$ g. (Atomic mass of zinc $$= 65.4$$ amu)
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For a reaction taking place in three steps at same temperature, overall rate constant $$K = \frac{K_1 K_2}{K_3}$$. If $$Ea_1, Ea_2$$ and $$Ea_3$$ are $$40, 50$$ and $$60$$ kJ/mol respectively, the overall $$Ea$$ is _______ kJ/mol.
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From the compounds given below, number of compounds which give positive Fehling's test is _______
Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.
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