If the radius of the first orbit of hydrogen atom is $$a_0$$, then de Broglie's wavelength of electron in 3$$^{rd}$$ orbit is
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If the radius of the first orbit of hydrogen atom is $$a_0$$, then de Broglie's wavelength of electron in 3$$^{rd}$$ orbit is
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Which one of the following elements will remain as liquid inside pure boiling water?
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Group-13 elements react with O$$_2$$ in amorphous form to form oxides of type M$$_2$$O$$_3$$ (M = element). Which among the following is the most basic oxide?
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During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.
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The volume of 0.02 M aqueous HBr required to neutralize 10.0 mL of 0.01 M aqueous Ba(OH)$$_2$$ is (Assume complete neutralization)
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Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
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Structures of BeCl$$_2$$ in solid state, vapour phase and at very high temperature respectively are:
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The strongest acid from the following is
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The group of chemicals used as pesticide is
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The product, which is not obtained during the electrolysis of brine solution is
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Consider the following reaction that goes from A to B in three steps as shown below:
Choose the correct option
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The IUPAC name of K$$_3$$[Co(C$$_2$$O$$_4$$)$$_3$$] 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: In the complex Ni(CO)$$_4$$ and Fe(CO)$$_5$$, the metals have zero oxidation state.
Reason R: Low oxidation states are found when a complex has ligands capable of $$\pi$$-donor character in addition to the $$\sigma$$-bonding.
In the light of the above statements, choose the most appropriate answer from the options given below
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Element not present in Nessler's reagent is
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In the following reaction, 'B' is
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Find out the major product from the following reaction.
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Given below are two statements:
Statement I: Morphine is a narcotic analgesic. It helps in relieving pain without producing sleep.
Statement II: Morphine and its derivatives are obtained from opium poppy.
In the light of the above statements, choose the correct answer from the options given below
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Formation of which complex, among the following, is not a confirmatory test of Pb$$^{2+}$$ ions
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Match List-I with List-II.
Choose the correct answer from the options given below:
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The number of species having a square planar shape from the following is
XeF$$_4$$, SF$$_4$$, SiF$$_4$$, BF$$_4^-$$, BrF$$_4^-$$, [Cu(NH$$_3$$)$$_4$$]$$^{2+}$$, [FeCl$$_4$$]$$^{2-}$$, [PtCl$$_4$$]$$^{2-}$$
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In an ice crystal, each water molecule is hydrogen bonded to ______ neighbouring molecules.
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Consider the following data
Heat of combustion of H$$_2$$(g) = -241.8 kJ mol$$^{-1}$$
Heat of combustion of C(s) = -393.5 kJ mol$$^{-1}$$
Heat of combustion of C$$_2$$H$$_5$$OH(l) = -1234.7 kJ mol$$^{-1}$$
The heat of formation of C$$_2$$H$$_5$$OH(l) is (-) ______ kJ mol$$^{-1}$$ (Nearest integer)
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The equilibrium composition for the reaction
$$PCl_3 + Cl_2 \rightleftharpoons PCl_5$$ at 298 K is given below:
[PCl$$_3$$]$$_{eq}$$ = 0.2 mol L$$^{-1}$$, [Cl$$_2$$]$$_{eq}$$ = 0.1 mol L$$^{-1}$$, [PCl$$_5$$]$$_{eq}$$ = 0.40 mol L$$^{-1}$$
If 0.2 mol of Cl$$_2$$ is added at the same temperature, the equilibrium concentrations of PCl$$_5$$ is ______ $$\times 10^{-2}$$ mol L$$^{-1}$$
Given: K$$_c$$ for the reaction at 298 K is 20
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Number of crystal systems from the following where body centred unit cell can be found, is ______.
Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic
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Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are ______.
A. 1 M aq. NaCl and 2 M aq. urea
B. 1 M aq. CaCl$$_2$$ and 1.5 M aq. KCl
C. 1.5 M aq. AlCl$$_3$$ and 2 M aq. Na$$_2$$SO$$_4$$
D. 2.5 M aq. KCl and 1 M aq. Al$$_2$$(SO$$_4$$)$$_3$$
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The standard reduction potentials at 295 K for the following half cells are given below:
NO$$_3^-$$ + 4H$$^+$$ + 3e$$^-$$ $$\rightarrow$$ NO(g) + 2H$$_2$$O E° = 0.97 V
V$$^{2+}$$(aq) + 2e$$^-$$ $$\rightarrow$$ V(s) E° = -1.19 V
Fe$$^{3+}$$(aq) + 3e$$^-$$ $$\rightarrow$$ Fe(s) E° = -0.04 V
Ag$$^+$$(aq) + e$$^-$$ $$\rightarrow$$ Ag(s) E° = 0.80 V
Au$$^{3+}$$(aq) + 3e$$^-$$ $$\rightarrow$$ Au(s) E° = 1.40 V
The number of metal(s) which will be oxidised by NO$$_3^-$$ in aqueous solution is ______.
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The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is ______.
Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather
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Among the following the number of compounds which will give positive iodoform reaction is ______.
(a) 1-Phenylbutan-2-one
(b) 2-Methylbutan-2-ol
(c) 3-Methylbutan-2-ol
(d) 1-Phenylethanol
(e) 3, 3-dimethylbutan-2-one
(f) 1-Phenylpropan-2-ol
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Number of isomeric aromatic amines with molecular formula C$$_8$$H$$_{11}$$N, which can be synthesized by Gabriel Phthalimide synthesis is ______.
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