Recent questions tagged 2019

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region ?

asked Jul 8, 2019 by pady_1

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Which one is malachite from the following ?

asked Jul 8, 2019 by pady_1

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Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor.M is :

asked Jul 8, 2019 by pady_1

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An alkene "A" on reaction with $O_3$ and $Zn-H_2O$ gives propanone and ethanal in equimolar ratio.Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is :-

asked Jul 8, 2019 by pady_1

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Which is the correct thermal stability order for$H_2E$ (E=O, S, Se, Te and Po) ?

asked Jul 8, 2019 by pady_1

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Match the Xenon compounds in Coloumn - I with its structure in Column - II and assigning the correct code:

asked Jul 8, 2019 by pady_1

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The biodegradable polymer is :-

asked Jul 8, 2019 by pady_1

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4d, 5d, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :-

asked Jul 8, 2019 by pady_1

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Identify the incorrect statement related to $PCl_5$ from the following :-

asked Jul 8, 2019 by pady_1

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If the rate constant for a first order reaction is k,the time (t) required for the completion of 90% of the reaction is given by :-

asked Jul 8, 2019 by pady_1

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For the second period elements the correct increasing order of first ionisation enthalpy is :-

asked Jul 8, 2019 by pady_1

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The manganate and permanganate ions are tetrahedral, due to

asked Jul 8, 2019 by pady_1

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Which of the following is an amphoteric hydroxide?

asked Jul 8, 2019 by pady_1

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Which of the following species is not stable ?

asked Jul 8, 2019 by pady_1

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Which will make basic buffer ?

asked Jul 8, 2019 by pady_1

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Conjugate base for Bronsted acids $H_2O$ and HF are:-

asked Jul 8, 2019 by pady_1

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Which mixture of the solutions will lead to the formation of negatively charged colloidal $[AgI] I^{-}$ sol. ?

asked Jul 8, 2019 by pady_1

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The correct order of the basic strength of methyl substituted amines in aqueous solution is :-

asked Jul 8, 2019 by pady_1

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Among the following, the narrow spectrum antibiotic is

asked Jul 8, 2019 by pady_1

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Which of the following reactions are disproportionation reaction ? (a)$2Cu^{+} \to Cu^{2+}+Cu^0$ (b)$3MnO_4^{2-}+4H^{+} \to 2MnO_4^{-}+MnO_2$ (c)$2KMnO_4 \underrightarrow{\qquad \Delta \qquad } K_2MnO_4 +MnO_2 +O_2$ (d)$2MnO_4^{-}+3Mn^{2+}+2H_2O \longrightarrow 5MnO_2+4H^{\oplus}$ Select the correct option from the following

asked Jul 8, 2019 by pady_1

1 answer

Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital theory?

asked Jul 8, 2019 by pady_1

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The number of sigma $(\sigma)$ and pi $ (\pi)$ bonds in pent-2-en-4-yne is :-

asked Jul 8, 2019 by pady_1

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Among the following, the one that is not a green house gas is :-

asked Jul 8, 2019 by pady_1

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For a cell involving one electron$ E^\ominus$ cell = 0.59V at 298 K, the equilibrium constant for the cell reaction is :- $\bigg[Given \;that \frac{2.303RT}{F}=0.059V \;at \;T=298k\bigg]$

asked Jul 8, 2019 by pady_1

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For an ideal solution, the correct option is :-

asked Jul 8, 2019 by pady_1

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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :-

asked Jul 8, 2019 by pady_1

2 answers

pH of a saturated solution of $Ca(OH)_2$ is 9. The solubility product $(K_{sp}) $of $Ca(OH)_2$ is :-

asked Jul 8, 2019 by pady_1

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A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :-

asked Jul 8, 2019 by pady_1

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Under isothermal condition, a gas at 300 K expands from 0.1L to 0.25L against a constant external pressure of 2 bar. The work done by the gas is :- [Given that 1L bar = 100 J]

asked Jul 8, 2019 by pady_1

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