Which one of the following statements for D.I. Mendeleeff, is incorrect?
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Which one of the following statements for D.I. Mendeleeff, is incorrect?
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Match List-I with List-II
| (a) SF$$_4$$ | (i) sp$$^3$$d$$^2$$ |
| (b) IF$$_5$$ | (ii) d$$^2$$sp$$^3$$ |
| (c) NO$$_2^+$$ | (iii) sp$$^3$$d |
| (d) NH$$_4^+$$ | (iv) sp$$^3$$ |
| (v) sp |
Choose the correct answer from the options given below:
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Match List-I with List-II
| (a) Ba | (i) Organic solvent soluble compounds |
| (b) Ca | (ii) Outer electronic configuration 6s$$^2$$ |
| (c) Li | (iii) Oxalate insoluble in water |
| (d) Na | (iv) Formation of very strong monoacidic base |
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Given below are the statements about diborane
(a) Diborane is prepared by the oxidation of NaBH$$_4$$ with I$$_2$$
(b) Each boron atom is in sp$$^2$$ hybridized state
(c) Diborane has one bridged 3 centre-2-electron bond
(d) Diborane is a planar molecule
The option with correct statement(s) is
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Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
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Which of the following compounds does not exhibit resonance?
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Which of the following molecules does not show stereo isomerism?
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In the chemical reactions given above A and B respectively are:
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The water having more dissolved O$$_2$$ is:
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Which one of the following 0.06 M aqueous solutions has lowest freezing point?
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Isotope(s) of hydrogen which emits low energy $$\beta^-$$ particles with $$t_{1/2}$$ value > 12 years is/are
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When silver nitrate solution is added to potassium iodide solution then the sol produced is:
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Sulphide ion is soft base and its ores are common for metals
(a) Pb (b) Al (c) Ag (d) Mg
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Which one of the following group-15 hydride is the strongest reducing agent?
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The set having ions which are coloured and paramagnetic both is -
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Which of the following compounds will provide a tertiary alcohol on reaction with excess of CH$$_3$$MgBr followed by hydrolysis?
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An organic compound A (C$$_6$$H$$_6$$O) gives dark green colouration with ferric chloride. On treatment with CHCl$$_3$$ and KOH, followed by acidification gives compound B. Compound B can also be obtained from compound C on reaction with pyridinium chlorochromate (PCC). Identify A, B and C.
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Which one of the following reactions does not occur?
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Match List-I with List-II :
| (a) Chloroprene | (i)
 |
| (b) Neoprene | (ii)
 |
| (c) Acrylonitrile | (iii)
 |
| (d) Isoprene | (iv) CH$$_2$$=CH-CN |
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Thiamine and pyridoxine are also known respectively as:
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Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene (Nearest integer)
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Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to:
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If the standard molar enthalpy change for combustion of graphite powder is $$-2.48 \times 10^2$$ kJ mol$$^{-1}$$, the amount of heat generated on combustion of 1 g of graphite powder in kJ (Nearest integer):
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Value of K$$_P$$ for the equilibrium reaction N$$_2$$O$$_4$$(g) $$\rightleftharpoons$$ 2NO$$_2$$(g) at 288 K is 47.9. The K$$_C$$ for this reaction at same temperature is (Nearest integer)
(R = 0.083 L bar K$$^{-1}$$ mol$$^{-1}$$)
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The number of acyclic structural isomers (including geometrical isomers) for pentene are ___.
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A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be 7.62 g cm$$^{-3}$$. The molar mass of copper complex is ___ gmol$$^{-1}$$
(Nearest integer): [Given : N$$_A$$ = 6.022 $$\times 10^{23}$$ mol$$^{-1}$$]
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If the concentration of glucose (C$$_6$$H$$_{12}$$O$$_6$$) in blood is 0.72 gL$$^{-1}$$, the molarity of glucose in blood is ___ $$\times 10^{-3}$$M (Nearest integer):
[Given : Atomic mass of C = 12, H = 1, O = 16 u]
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Assume a cell with the following reaction Cu$$_{(s)}$$ + 2Ag$$^+$$(1 $$\times 10^{-3}$$M) $$\to$$ Cu$$^{2+}$$(0.250M) + 2Ag$$_{(s)}$$
E$$^\circ_{cell}$$ = 2.97 V
E$$_{cell}$$ for the above reaction is ___ V.
(Nearest integer)
[Given : log 2.5 = 0.3979, T = 298 K]
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N$$_2$$O$$_{5(g)} \to$$ 2NO$$_{2(g)}$$ + $$\frac{1}{2}$$O$$_{2(g)}$$
In the above first order reaction the initial concentration of N$$_2$$O$$_5$$ is $$2.40 \times 10^{-2}$$ mol L$$^{-1}$$ at 318 K. The concentration of N$$_2$$O$$_5$$ after 1 hour was $$1.60 \times 10^{-2}$$ mol L$$^{-1}$$. The rate constant of the reaction at 318 K is ___ $$\times 10^{-3}$$ min$$^{-1}$$ (Nearest integer):
[Given : log 3 = 0.477, log 5 = 0.699]
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The total number of unpaired electrons present in [Co(NH$$_3$$)$$_6$$]Cl$$_2$$ and [Co(NH$$_3$$)$$_6$$]Cl$$_3$$ is ___.
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