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In which of the following equilibrium, Kc and Kp are not equal? (A) 2C(s) + O₂(g) ⇌ 2CO(g) (B) 2NO(g) ⇌ N₂(g) + O₂(g)< (C) SO₂(g)+NO₂(g) ⇌ SO₃(g) + NO(g) (D) H₂(g) +I₂(g) ⇌ 2HI(g)

Answer: (a) Kc and Kp are both equilibrium constants. Kc is measured in terms of molar concentration of reactants and products whereas, Kp is... View Article

How many structural formulas are possible when one of the hydrogen is replaced by a chlorine atom in anthracene? (A) 3 (B) 7 (C) 4 (D) 6

Answer: (a) The molecular formulae of structural isomers are same, but their structures are not. The number of atoms in each structural... View Article

Is there peroxide linkage present in h2so5?

To determine whether a compound contains peroxide bonds, consider the oxidation number of a central metal in the compound. If the oxidation... View Article

Which among the following is the heaviest? A. One mole of oxygen B. One molecular of sulphur trioxide C. 100 amu of uranium D. 44g of carbon dioxide

Answer: (d) 44g of CO2 44g of CO2= 1 mole = 44g Hence, the heaviest among all of them is CO2. The no. of moles is given as 1, and the... View Article

Number of possible spectral lines which may be emitted in Brackett series in H-atom if the electrons in ninth excited state returns to ground state are: A 5 B 45 C 6 D 21

The Brackett series is the emission or absorption lines produced by electron jumps between the fourth and higher energy levels in H- atoms. The... View Article

Equal weights of mercury and iodine are allowed to react completely to form a mixture of mercurous and mercuric iodine leaving none of the reactants. The ratio by mole of Hg₂I₂ and HgI₂ formed (Hg=200, I=127) is:

Number of moles of atom/molecule =wt(gram)atomic.wt/molecular.wt The number of moles of atom or molecule is given by weight in grams by the... View Article

Vapour phase refining is used for which of the following elements?

The vapour phase refining technique is used for the refining of nickel, titanium and zirconium metals. Impure nickel metal is obtained from... View Article

Among alkali metal halides minimum melting point of chlorides is: (A) LiCl > NaCl > KCl > CsCl (B) LiCl > NaCl > CsCl > KCl (C) NaCl > KCl > CsCl > LiCl (D) LiCl > NaCl > CsCl > KCl

on moving down the group of alkali metals, with increase in the size of the alkali metal cation, the melting point of alkali metal chlorides... View Article

Soft drinks bottles and baby feeding bottles are generally made up of ____.

Polystyrene It is a synthetic thermoplastic polymer made up of styrene. It can easily be moulded and is generally utilised in protective... View Article

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon (a) charge of interacting particles (b) mass of interacting particles (c) polarisability of interacting particles (d) strength of permanent dipoles in the particles

Answer: (c) The interaction energy has the relation; interaction energy ∝ 1r6 ∝ polarisability. Interaction energy is inversely proportional... View Article

Potash alum dissolves in water to give

Potash alum is a chemical compound widely used as the potassium sulfate dodecahydrate. It is double salt that is used commonly in medicine and... View Article

What is the state of hybridisation of boron and oxygen atoms in boric acid(H3BO3 ) respectively?

H3BO3 is the chemical formula for boric acid. Three hydroxyl groups create a connection with the central boron atom. Boron's outermost valence... View Article

A photosensitive metallic surface is illuminated alternately with lights of wavelength 3100 A and 6200 A. It is observed that maximum speeds of the photoelectrons in two cases are in the ratio 2:1. The work function of the metal is (hc = 12400 eVA).

a photosensitive metallic surface is illuminated alternatively with lights of wavelength 3100 A and 6200 A. Also, the maximum speeds of the... View Article

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be A) 36u B) 64u C) 9u D) 27u

Graham law of effusion states that effusion of any gas is inversely proportional to the square of its molecular mass or its density. In... View Article

Which of the following has minimum bond length? A.O₂⁺ >B.O₂⁻ C.O₂²⁻ D.O₂

Answer: (a) The most essential rule of the VSEPR theory is that bond angles around a core atom should be chosen to reduce total repulsion... View Article

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three:(A) PCl₅ (B) SF₄ (C) I₃⁻ (D) SbCl₅²⁻

Answer: (d) To predict the hybridization of the molecule by using the below formula, H=1/2[V+M−C+A] Where H = number of orbitals in... View Article

Which of the following statements are correct for SO2 gas? (i) It acts as bleaching agent in moist conditions. (ii) It’s molecule has linear geometry. (iii) It’s dilute solution is used as disinfectant. (iv) It can be prepared by the reaction of dilute H2SO4 with metal sulphide.

Answer: (i), (iii) SO2 is used in the bleaching of wool and silk and as an antichlor, disinfectant, and preservative. Sulfur dioxide, (SO2),... View Article

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