Identify the correct order of standard enthalpy of formation of sodium halides.
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Identify the correct order of standard enthalpy of formation of sodium halides.
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Match List-I with List-II.
| List-I | List-II | ||
|---|---|---|---|
| A | Weak intermolecular forces of attraction | I | Hexamethylenediamine + adipic acid |
| B | Hydrogen bonding | II | AlEt$$_3$$ + TiCl$$_4$$ |
| C | Heavily branched polymer | III | 2-chloro-1, 3-butadiene |
| D | High density polymer | IV | Phenol + formaldehyde |
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Given below are two statements :
Statement I : SO$$_2$$ and H$$_2$$O both possess V-shaped structure
Statement II : The bond angle of SO$$_2$$ is less than that of H$$_2$$O.
In the light of the above statements, choose the most appropriate answer from the options given below:
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What happens when methane undergoes combustion in systems A and B respectively?
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reactions.
Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Better method for preparation of BeF$$_2$$, among the following is
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The major product for the following reaction is :
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Order of acidic nature of the following compounds is A > B > C.
Reason R: Fluoro is a stronger electron withdrawing group than Chloro group.
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements :
Statement I : Tropolone is an aromatic compound and has $$8\pi$$ electrons.
Statement II : $$\pi$$ electrons of $$> C = O$$ group in tropolone is involved in aromaticity. In the light of the above statements choose the correct answer from the options given below:
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Which of the following are the Green house gases?
A. Water vapour
B. Ozone
C. I$$_2$$
D. Molecular hydrogen
Choose the most appropriate answer from the options given below :
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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 diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect.
Reason R : The light scatters in all directions when the size of particles is large enough.
In the light of the above statements, choose the correct answer from the options given below :
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Given below are two statements related to Ellingham diagram :
Statement I : Ellingham diagrams can be constructed for formation of oxides, sulphides and halides of metals.
Statement II : It consists of plots of $$\Delta H°$$ vs T for formation of oxides of elements.
In the light of the above statements, choose the most appropriate answer from the options given below :
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The correct group of halide ions which can be oxidised by oxygen in acidic medium is
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The covalency and oxidation state respectively of boron in BF$$_4^-$$, are
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Which of the following complexes will exhibit maximum attraction to an applied magnetic field?
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The total number of stereoisomers for the complex $$[Cr(ox)_2ClBr]^{3-}$$ (where ox = oxalate) is
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Match List-I with List-II.
1-Bromopropane is reacted with reagents in List-I to give product in List-II
| List-I Reagent | List-II Product | ||
|---|---|---|---|
| A | KOH (alc) | I | Nitrile |
| B | KCN (alc) | II | Ester |
| C | AgNO$$_2$$ | III | Alkene |
| D | H$$_3$$CCOOAg | IV | Nitroalkane |
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Compound A from the following reaction sequence is :
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In the wet tests for detection of various cations by precipitation, Ba$$^{2+}$$ cations are detected by obtaining precipitate of
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The naturally occurring amino acid that contains only one basic functional group in its chemical structure is
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$$1.1$$ g of a carbonate M$$_2$$CO$$_3$$ on treatment with excess HCl produces $$0.01$$ mol of CO$$_2$$. The molar mass of M$$_2$$CO$$_3$$ is _____ g mol$$^{-1}$$. (Nearest integer)
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The orbital angular momentum of an electron in $$3$$ s orbital is $$\frac{xh}{2\pi}$$. The value of x is _____ (nearest integer)
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$$20$$ mL of $$0.1$$ M NaOH is added to $$50$$ mL of $$0.1$$ M acetic acid solution. The pH of the resulting solution is _____ $$\times 10^{-2}$$. (Nearest integer) Given : pKa CH$$_3$$COOH $$= 4.76$$
log 2 = 0.30
log 3 = 0.48
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See the following chemical reaction:
Cr$$_2$$O$$_7^{2-}$$ + XH$$^+$$ + 6Fe$$^{2+}$$ $$\to$$ YCr$$^{3+}$$ + 6Fe$$^{3+}$$ + ZH$$_2$$O
The sum of X, Y and Z is _____.
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If the formula of Borax is Na$$_2$$ B$$_4$$O$$_x$$(OH)$$_y$$ $$\cdot$$ zH$$_2$$O, then x + y + z = _____
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$$0.400$$ g of an organic compound (X) gave $$0.376$$ g of AgBr in Carius method for estimation of bromine. % of bromine in the compound (X) is (Given: Molar mass AgBr $$= 188$$ g mol$$^{-1}$$, Br $$= 80$$ g mol$$^{-1}$$)
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Sodium metal crystallises in a body centred cubic lattice with unit cell edge length of $$4$$ A. The radius of sodium atom is _____ $$\times 10^{-1}$$ A. (Nearest integer)
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Sea water contains $$29.25$$% NaCl and $$19$$% MgCl$$_2$$ by weight of solution. The normal boiling point of the sea water is _____ °C (Nearest integer) Assume 100% ionization for both NaCl and MgCl$$_2$$. Given:
K$$_b$$H$$_2$$O $$= 0.52$$ K kg mol$$^{-1}$$. Molar mass of NaCl and MgCl$$_2$$ is $$58.5$$ and $$95$$ g mol$$^{-1}$$ respectively.
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At 298 K, the standard reduction potential for Cu$$^{2+}$$/Cu electrode is 0.34 V. Given :
K$$_{sp}$$Cu(OH)$$_2$$ $$= 1 \times 10^{-20}$$. Take $$\frac{2.303RT}{F} = 0.059$$ V. The reduction potential at pH = 14 for the above couple is $$(-) x \times 10^{-2}$$ V. The value of x is _____.
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A(g) $$\to$$ 2B(g) + C(g) is a first order reaction. The initial pressure of the system was found to be $$800$$ mm Hg which increased to $$1600$$ mm Hg after $$10$$ min. The total pressure of the system after $$30$$ min will be _____ mm Hg. (Nearest integer)
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