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Which of the following compounds contain(s) no covalent bond(s)? KCl, PH₃, O₂, B₂H₆, H₂SO₄

1) KCl, H2SO4 2) KCl 3) KCl, B2H6 4) KCl, B2H6, PH3 Answer: (2) KCl - Ionic bond between K+ and Cl– PH3- Covalent bond between P and H... View Article

Which type of ‘defect’ has the presence of cations in the interstitial sites?

1) Vacancy defect 2) Frenkel defect 3) Metal deficiency defect 4) Schottky defect Answer (2) In Frenkel defect, cation is dislocated from... View Article

The correct order of basicity of the following compound is :

1) (b) < (a) < (c) < (d) 2) (b) < (a) < (d) < (c) 3) (d) < (b) < (a) < (c) 4) (a) < (b) < (c) < (d)... View Article

According to molecular orbital theory, which of the following will not be a viable molecule?

1) He2+ 2) H2- 3) H22- 4) He22+ Answer: (3) Molecule having zero bond order will not be a viable molecule.... View Article

When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is

1) Ca 2) Al 3) Fe 4) Zn Answer: (2) Al2O3 is used in column chromatography.... View Article

Total number of lone pair of electrons in I₃ ion is

1) 6 2) 9 3) 12 4) 3 Answer: (2) Structure of I3- Number of lone pairs in I3- is 9.... View Article

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)

1) 0.8 hours 2) 3.2 hours 3) 1.6 hours 4) 6.4 hours Answer: (2) B2H6 +3O2 -> B2O3 +3H2O 27.66 of B2H6 = 1 mole of B2H6 which requires... View Article

The compound that does not produce nitrogen gas by the thermal decomposition is

1) (NH4)2Cr2O7 2) NH4NO2 3) (NH4)2SO4 4) Ba(N3)2 Answer: (3) Among all the given compounds, only (NH4)2SO4 do not form dinitrogen on... View Article

The combustion of benzene (l) gives CO₂(g) and H₂O (l). Given that heat of combustion of benzene at constant volume is -3263.9 kJ mol ^-1 at 25⁰C ; heat of combustion (in kJ/mol) of benzene at constant pressure will be (R = 8.314 JK^-1 mol^-1)

1) -452.46 2) 3260 3) -3267.6 4) 4152.6 Answer: (3) C6H6 (l) + (15/2)O2 (g) -> 6CO2 (g) + 3H2O (l) Δng = 6-(15/2) = -3/2 ΔH = ΔU +ΔngRT... View Article

An aqueous solution contain 0.10 M H₂S and 0.20 M HCl. If the equilibrium constant for the formation of HS^– from H₂S is 1.0×10^-7 and that of S^2- from HS^– ions is 1.2×10^-13 then the concentration of S^2- ions in aqueous solution is

1) 3×10-20 2) 6×10-21 3) 5×10-19 4) 5×10-8 Answer: (1) Ka1.Ka2 = Keq [S2-] = 3×10-20... View Article

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

Base Acid End point 1. Strong Strong Pinkish red to yellow 2. Weak Strong... View Article

Which of the following are Lewis acids?

1) AlCl3 and SiCl4 2) PH3 and SiCl4 3) BCl3 and AlCl3 4) PH3 and BCl3 Answer: (3) BCl3 - electron deficient, incomplete octet AlCl3 -... View Article

Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?

Answer: (1) Kjeldahl method is not applicable for compounds containing nitrogen in nitro, and azo groups and nitrogen in ring, as N of these... View Article

Which of the following salts is the most basic in aqueous solution?

1) CH3COOK 2) FeCl3 3) Pb(CH3COO)2 4) Al(CN)3 Answer: (1) CH3COOK + H2O -> CH3COOH + KOH (basic) FeCl3 - Acidic solution Al(CN)3 - Salt... View Article

[latex]Fe{{C}_{2}}{{O}_{4}},F{{e}_{2}}{{({{C}_{2}}{{O}_{4}})}_{3}},FeS{{O}_{4}},F{{e}_{2}}{{(S{{O}_{4}})}_{3}}[/latex] one mole each, will react with how many moles of [latex]KMn{{O}_{4}}[/latex]

a.1 b.2 c.3 d.5 Answer: (b) ∴ Total:... View Article

Three mole of Ag is heated from 300 K to 1000 K. Calculate ΔH when P = 1 atm and C_P = 23 + 0.01 T.

a. 62 kJ/mol b. 45 kJ/mol c. 38 kJ/mol d. 54 kJ/mol Answer: (a)... View Article

In isoelectronic species [latex]C{{l}^{-}},Ar,C{{a}^{2+}}[/latex] size differ due to

a.Nuclear charge b.Electronic – electronic repulsion in valence shell c.Magnetic quantum number d.Principal quantum number Answer: (a) In... View Article

Assertion: Ozone is getting depleted due to CFCs. Reason: With the deplection of ozone layer more UV radiation filters into troposphere

a. Both Assertion and Reason are true and Reason is the correct explanation of Assertion. b. Both Assertion and Reason are true but Reason is... View Article

What will the order of magnetic moment (μ) be

Given complexes are low spin complexes, Then order of magnetic moment (μ) for is a. b. c. d. Answer: (c) For... View Article

For [latex]Z{{r}_{3}}{{(P{{O}_{4}})}_{4}}[/latex] the solubility product is K_sp and solubility is S. Find the correct relation.

a. b. c. d. Answer: (a) It is A3B4 type of salt Hence... View Article