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Given below are two statements
Statement I : According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised.
Statement II : The concept of electron in Bohr's orbit, violates the Heisenberg uncertainty principle. In the light of the above statements, choose the most appropriate answer from the options given below
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Consider the following statement
(A) NF$$_3$$ molecules has a trigonal planar structure.
(B) Bond Length of N$$_2$$ is shorter than O$$_2$$.
(C) Isoelectronic molecules or ions have identical bond order.
(D) Dipole moment of H$$_2$$S is higher than that of water molecule.
Choose the correct answer from the options given below:
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Which of the following statement(s) is/are correct?
(A) The pH of $$1 \times 10^{-8}$$ M HCl solution is 8.
(B) The conjugate base of H$$_2$$PO$$_4^-$$ is HPO$$_4^{2-}$$.
(C) K$$_w$$ increases with increase in temperature.
(D) When a solution of a weak monoprotic acid is titrated against a strong base at half neutralisation point, pH $$= \frac{1}{2}$$pK$$_a$$. Choose the correct answer from the options given below:
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During water-gas shift reaction
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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) : BeCl$$_2$$ and MgCl$$_2$$ produce characteristic flame
Reason (R) : The excitation energy is high in BeCl$$_2$$ and MgCl$$_2$$
In the light of the above statements, choose the correct answer from the options given below:
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For a good quality cement, the ratio of silica to alumina is found to be
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Which of the following statement is correct for paper chromatography?
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Decreasing order of reactivity towards electrophilic substitution for the following compounds is:
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The product formed in the following multistep reaction is:
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The possibility of photochemical smog formation will be minimum at
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Which of the following expressions is correct in case of a CsCl unit cell (edge length 'a')?
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Which one of the following is not an example of calcination?
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The number of P $$-$$ O $$-$$ P bonds in H$$_4$$P$$_2$$O$$_7$$, (HPO$$_3$$)$$_3$$, and P$$_4$$O$$_{10}$$ are respectively
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The complex with highest magnitude of crystal field splitting energy $$(\Delta_0)$$ is
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The major product formed in the Friedel-Craft acylation of chlorobenzene is
A cyclic anhydride reacts with H$$_2$$O to give 'A' (major product).
'A' formed in the above reaction is
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Consider the following sequence of reactions
The product 'B' is
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In the above conversion the correct sequence of reagents to be added is
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Match List I with List II:
| List I (Monomer) | List II (Polymer) | ||
|---|---|---|---|
| A | Tetrafluoroethene | I | Orlon |
| B | Acrylonitrile | II | Natural rubber |
| C | Caprolactam | III | Teflon |
| D | Isoprene | IV | Nylon-6 |
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Which is not true for arginine?
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The total number of isoelectronic species from the given set is _____.
O$$^{2-}$$, F$$^-$$, Al, Mg$$^{2+}$$, Na$$^+$$, O$$^+$$, Mg, Al$$^{3+}$$, F
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$$30.4$$ kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is $$28.4$$ J K$$^{-1}$$ mol$$^{-1}$$ at 1 atm. The melting point of sodium chloride is _____ K (Nearest Integer)
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The total change in the oxidation state of manganese involved in the reaction of KMnO$$_4$$ and potassium iodide in the acidic medium is _____.
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The vapour pressure of $$30\%$$ (w/v), aqueous solution of glucose is _____ mm Hg at $$25°$$C.
[Given: The density of 30% (w/v), aqueous solution of glucose is $$1.2$$ g cm$$^{-3}$$ and vapour pressure of pure water is $$24$$ mm Hg.]
(Molar mass of glucose is 180 g mol$$^{-1}$$)
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The number of correct statements from the following is _____
(A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes.
(B) The number of ions per unit volume that carry current in a solution increases on dilution.
(C) Molar conductivity increases with decrease in concentration.
(D) The variation in molar conductivity is different for strong and weak electrolytes.
(E) For weak electrolytes, the change in molar conductivity with dilution is due to decrease in degree of dissociation.
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For a reversible reaction A $$\rightleftharpoons$$ B, the $$\Delta H$$ forward reaction $$= 20$$ kJ mol$$^{-1}$$. The activation energy of the uncatalyzed forward reaction is $$300$$ kJ mol$$^{-1}$$. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at $$27°$$C is found to be same as that of the uncatalyzed reaction at $$327°$$C. The activation energy of the catalysed backward reaction is _____ kJ mol$$^{-1}$$.
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$$20$$ mL of $$0.5$$ M NaCl is required to coagulate $$200$$ mL of As$$_2$$S$$_3$$ solution in 2 hours. The coagulating value of NaCl is _____.
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In Chromyl chloride, the oxidation state of chromium is $$(+)$$ _____.
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The volume (in mL) of $$0.1$$ M AgNO$$_3$$ required for complete precipitation of chloride ions present in $$20$$ mL of $$0.01$$ M solution of [Cr(H$$_2$$O)$$_5$$Cl]Cl$$_2$$ as silver chloride is _____.
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The homoleptic and octahedral complex of Co$$^{2+}$$ and H$$_2$$O has _____ unpaired electron(s) in the t$$_{2g}$$ set of orbitals.
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