Which of the following pairs do not have the same nature?
a. B(OH)3, H3PO3 b. Be(OH)2, Al(OH)3 c. B(OH)3, Al(OH)3 d. Mg(OH)2, NaOH Solution: Answer:(c) Option a: Both are acidic in nature.... View Article
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Which condition is required to show the Tyndall Effect by the colloidal solution?
a. The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude b. The refractive indices... View Article
In which of the following, resonance is not possible?
Question:In which of the following, resonance is not possible? a. 1, 2 b. 2, 4 c. 3, 4 d. 1,... View Article
Determine the Azimuthal quantum number of the last electron of Ga+ ion
a. 1 b. 0 c. 2 d. 3 Solution: Answer:(b) 31Ga – 1s2 2s22p63s23p63d104s24p1 31Ga+ – 1s2 2s22p63s23p63d104s2 Since the... View Article
Product A and B for the following reactions are as follows
Question: Product A and B for the following reactions are as follows: Solution: Answer:(c) Hence, option (c) is the correct... View Article
Which of the following is most economically refined by fractional distillation?
a. Zn b. Ni c. Cu d. Fe Solution: Answer:(a) The main impurities in Zn are generally cadmium, lead and... View Article
If P4O10 + HNO3 are mixed in a 1:4 ratio, then the nature of nitrogen oxide obtained will be:
a. Acidic b. Basic c. Amphoteric d. Neutral Solution: Answer:(a) P4O10 + 4 HNO3 → 4HPO3 + 2N2O5 N2O5 is... View Article
Which of the following does not disproportionate?
a. BrO– b. \(\begin{array}{l}BrO_{2}^{-}\end{array} \) c. \(\begin{array}{l}BrO_{3}^{-}\end{array} \) d. \(\begin{array}{l}BrO_{4}^{-}\end{array} \) Solution: Answer:(d) For a species to undergo disproportionation, the... View Article
How many equivalents of CH3MgBr are required to make 2-methylpropan-2-ol from ethyl ethanoate?
Solution: Answer:2
Determine the number of nitrogen atoms in a semicarbazide.
a. 2 b. 3 c. 4 d. None Solution: Answer: (b) Semicarbazide has 3 nitrogen atoms.
Which of the following will form superoxide?
a. K b. Na c. Mg d. Ca Solution: Answer:(a) From group 1 elements, K, Rb, Cs can form Superoxide... View Article
Which of the following is incorrect – chemistry problem
Question: Which of the following is incorrect? a. Amylose is branched b. Glycogen is also called animal starch c. Starch... View Article
Ninhydrin test for proteins results in the structure:
Solution: Answer: Ruhemann’s Purple
Determine the product formed when 2,2-dimethyl-3-bromobutane reacts with ethanol at high temperatures.
a. 2,3-dimethylbut-2-ene b. 3,3-dimethylbut-1-ene c. 3-ethoxy-2,2-dimethylbutane d. 2-ethoxy-2,3-dimethylbutane Solution: Answer:(a)
A person requires 10000 kJ energy per day and ∆H combustion of glucose is 2700 kJ mol-1. How many grams of glucose are required by the body in a day?
a. 666.67 g b. 6.67 g c. 66.67 g d. 6666.67 g Solution: Answer:(a) Molar mass of glucose (C6H12O6) =... View Article
The correct order of the wavelengths of light absorbed by them is
Question:Three complexes [CoCl(NH3)5]2+ (I), [Co(NH3)5H2O}3+ (II) and [Co(NH3)6}3+ (III)absorb light in the visible region. The correct order of the wavelengths... View Article
250 ml of 0.5 m NaOH is added to 500 mL of 1 M HCl. What is the final concentration of the remaining HCl?
a. 0.1 M b. 0.5 M c. 50 M d. 5 M Solution: Answer:(b) Neutralization reaction: NaOH + HCl →... View Article
The wave number of the spectral line in the emission spectrum of Hydrogen will be equal to 8/9 times the Rydberg’s constant if the electron jumps from:
a. n = 3 to n = 1 b. n = 9 to n = 1 c. n = 10... View Article
The number of lone pairs present on the central atom of [latex]I_{3}^{-}[/latex] is
a. 9 b. 1 c. 6 d. 3 Solution: Answer:(d) \(\begin{array}{l}I_{3}^{-}\end{array} \) has a linear structure. The number of lone... View Article
The Vapour pressure of pure benzene is 70 torr and that of methylbenzene is 20 torr. If we have an equimolar mixture of the above two components, find the mole fraction of benzene in the vapour phase.
Solution: Answer:7/9 \(\begin{array}{l}P_{C_{6}H_{6}}^{0} = 70\: torr\end{array} \) \(\begin{array}{l}P_{C_{6}H_{5}CH_{3}}^{0} = 20\: torr\end{array} \) \(\begin{array}{l}X_{C_{6}H_{6}} = X_{C_{6}H_{5}CH_{3}}\end{array} \) \(\begin{array}{l}Y_{C_{6}H_{6}} = \frac{P_{C_{6}H_{6}}^{0} \times... View Article
