The below given first-order reaction has initial and final moles
Question: The below given first-order reaction has initial and final moles of PCl5 as 50 and 10 respectively in 120... View Article
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An equimolar mixture of NaOH and Na2CO3 weighs 4 g, then the weight of NaOH is:
Solution: Answer: 1.096 g Let the weight of NaOH be w1 g and that of Na2CO3 be w2 g The... View Article
The initial mass of a radioactive substance becomes 1/16th in 80 minutes. Find the half-life.
Answer: 20 min. [A]t = [A]o / 2n [A]t is the concentration at time t [A]o is the initial concentration... View Article
Bakelite is formed by cross-linking of which of the following
a. Novolac b. Buna-S c. Dacron d. PHBV Solution: Answer: (a) Bakelite is formed by cross-linking of novolac and formaldehyde.... View Article
In nitration HNO3 and H2SO4 act as:
a. Both acid b. Both base c. HNO3: acid and H2SO4: base d. HNO3: base and H2SO4: acid Solution: Answer:... View Article
The hybridization of N in [latex]NO_{2}^{-}[/latex], [latex]NO_{2}^{+}[/latex], [latex]NO_{4}^{+}[/latex] are respectively.
a. sp2, sp, sp3 b. sp3, sp, sp3 c. sp, sp, sp3 d. sp2, sp2, sp3 Solution: Answer: (a) To... View Article
Sodium does not normally react with
a. Ammonia gas b. Ethyne c. But-2-yne d. Propyne Solution: Answer: (c) For reaction with sodium metal, the compound should... View Article
Predict the product – Chemistry Problem
Question: Predict the product. Solution: Answer: (c) This reaction is aldol condensation. Hence, option (c) is the correct answer.
Benzene with Br and CONH2 at the meta position is made to react with KOBr to give A
Question: Benzene with Br and CONH2 at the meta position is made to react with KOBr to give A and... View Article
Which of the following does not have a magnetic moment of 1.73 B.M?
a. \(\begin{array}{l}O_{2}^{+}\end{array} \) b. \(\begin{array}{l}O_{2}^{-}\end{array} \) c. [Cu(NH3)4]Cl2 d. CuI Solution: Answer: (d) Magnetic moment = √n(n+2) B.M Where n... View Article
In FCC, 50% of tetrahedral voids are filled. Find the effective number of atoms in a unit cell if it consists of the same atoms in the lattice and voids.
a. 6 b. 8 c. 4 d. 5 Solution: Answer: (b) In CCP/FCC, there are two tetrahedral voids on every... View Article
Find product B
Question: Find product B. Solution: Answer: (b) Hence, option (b) is the correct answer.
4s2 4p1 Identify the element that is diagonally a part of the next period in p-block.
a. Ge b. Sn c. In d. Pb Solution: Answer: (b) The element with the outer electron configuration of 4s2... View Article
The difference in the number of unpaired electrons in NiCl2 and [Ni(CN)6]2-is:
a. 0 b. 1 c. 2 d. 3 Solution: Answer: (c) In NiCl2, Ni is in +2 oxidation state. Hence,... View Article
The correct order of rate of hydrolysis of ester, acid chloride, and acid anhydride is
a. Acid chloride > Acidic anhydride > Ester b. Ester > Acidic anhydride > Acid chloride c. Ester > Acid... View Article
Which of the following gases retards the rate of photosynthesis?
a. CO b. NO2 c. CO2 d. CFC Solution: Answer: (b) When fossil fuel is burnt nitrogen and dioxygen combine... View Article
Find the second excitation energy of Li2+
a. 108.8 eV b. 81.6 eV c. 13.6 eV d. 95.2 eV Solution: Answer:(a) Second excitation energy means the electron... View Article
The hybridization of xenon in XeOF4 is
a. sp3 b. sp3d c. sp3d2 d. Sp3d3 Solution: Answer:(c) Hybridization can be predicted with the help of a steric... View Article
Green chemistry used in day-to-day life for
a. Cleaning cloth with water b. Using liquid H2O2 in dying clothes c. Using tetrachloroethane in laundries d. Using chlorine... View Article
Are the statements true or false – Chemistry Problem
Question:Are the statements true or false? Statement-1: Dihedral angle of H2O2 in gas is 90°. Statement-2: Dihedral angle of H2O2... View Article
