The purest form of commercial iron is:
a) cast iron b) wrought iron c) scrap iron and pig iron d) pig iron p>Answer: b
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The number of orbitals associated with quantum number n = 5, ms = +½ is :
a) 11 b) 15 c) 25 d) 50 Answer: c n = 5; l = (n – 1) = 4;... View Article
What is the product of the following reaction?
Hex-3-ynal (i) NaBH4 (ii) PBr3 (iii) Mg/ether (iv) CO2/H3O+ Answer: b
The increasing order of pKb for the following compounds will be :
(i) H2N-CH=NH (ii) (iii) CH3NHCH3 a) ii < iii < i b) iii < i < ii c) i <... View Article
Amongst the following statements, that which was not proposed by Dalton was :
a) matter consists of indivisible atoms. b) when gases combine or reproduced in a chemical reaction they do so in... View Article
The atomic radius of Ag is closest to :
a) Ni b) Cu c) Au d) Hg Answer: c Because of Lanthanide contraction, an increase in Zeff is observed... View Article
At 350C, the vapour pressure of CS2 is 512 mm Hg and that of acetone is 344 mm Hg. A solution of CS2 in acetone has a total vapour pressure of 600 mm Hg. The false statement amongst the following is :
a) CS2 and acetone are less attracted to each other than to themselves b) heat must be absorbed in order... View Article
The relative strength of interionic/ intermolecular forces in decreasing order is:
a) ion-dipole > dipole-dipole > ion-ion b) dipole-dipole > ion-dipole > ion-ion c) ion-ion > ion-dipole > dipole-dipole d) ion-dipole... View Article
In the following reaction, compound Q is obtained from compound P via an ionic intermediate.
What is the degree of unsaturation of Q? Answer: 18 The total degree of unsaturation = 18
Uranium 238 is known to undergo radioactive decay to form isotope of lead Pb 206 by emitting alpha and beta particles.
A rock initially contained 68 × 10−6 g of \(\begin{array}{l}_{92}^{238}\textrm{u}\end{array} \). If the number of alpha particles that it would... View Article
Aluminum reacts with sulfuric acid to form aluminum sulfate and hydrogen. What is the volume of hydrogen gas in liters (L) produced at 300 K and 1.0 atm pressure, when 5.4 g of aluminum and 50.0 mL of 5.0 M sulfuric acid are combined for the reaction?
(Use molar mass of aluminum as 27.0 g mol−1, = 0.082 atm L mol−1 K−1) Answer: 6.15 Liter 2Al +... View Article
Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K.
Its cell reaction is H2(g) + ½ O2(g) → H2O(l) The work derived from the cell on the consumption of 1.0... View Article
Consider the reaction A ⇌ B at 1000 K. At time ’, the temperature of the system was increased to 2000 K and the system was allowed to reach equilibrium. Throughout this experiment, the partial pressure of A was maintained at 1 bar.
Given below is the plot of the partial pressure of B with time. What is the ratio of the standard... View Article
5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the NaOH solution?
Exp. No. Vol. of NaOH (mL) 1 12.5 2 10.5 3 9.0 4 9.0 5 9.0 Answer: 0.11 H2C2O4 +... View Article
The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has a smaller ionic radius. Choose the correct statement(s).
a) The empirical formula of the compound is MX. b) The cation M and anion X have different coordination geometries.... View Article
With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).
a) The hypochlorite ion is the strongest conjugate base. b) The molecular shape of only chlorate ion is influenced by... View Article
Choose the correct statement(s) among the following:
a) [FeCl4]− has tetrahedral geometry. b) [Co(en)(NH3)2Cl2]+has 2 geometrical isomers. c) [FeCl4]− has higher spin-only magnetic moment than [Co(en)(NH3)2Cl2]+. d)... View Article
In the reaction scheme shown below, Q, R, and S are the major products.
The correct structure of Answer: b, d
With respect to the compounds I-V, choose the correct statement(s).
a) The acidity of compound I is due to delocalization in the conjugate base. b) The conjugate base of compound... View Article
In thermodynamics, the – work done is given by
\(\begin{array}{l}w = -\int dVP_{ext}\end{array} \). For a system undergoing a particular process, the work done is, \(\begin{array}{l}w = -\int dV... View Article
