Options:
- A. Combustion method
- B. Dumas method
- C. Kjeldahls method
- D. All of the above methods are for different purposes
View Answer
A. Combustion method
Chemistry
Which statement is consistent with Hunds rule ?
Options:
- A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
- B. The electrons in the same atom cannot have the same four quantum numbers
- C. There is maximum of two electrons is an orbital.
- D. None
View Answer
A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?
Options:
- A. Quantum structure
- B. Secondary structure
- C. Tertiary structure
- D. Primary structure
View Answer
B. Secondary structure
Which of the following points are important in connection with equilibrium constant ?
Options:
- A. Kc is constant at given temperature
- B. Kc is unaffected by change in concentration of reactants or products
- C. Kc indicates the extent of reaction but not about the rate of reaction.
- D. All of the above
View Answer
D. All of the above
Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?
Options:
- A. one / seventeen
- B. sixteen / seventeen
- C. one / three
- D. two / three
View Answer
C. one / three
Which of the following statements about isotopes is correct ?
Options:
- A. Isotopes with odd atomic number are abundant
- B. Isotopes with odd atomic number and even mass number are abundant
- C. Isotopes with even atomic number and even mass number are abundant
- D. Isotopes with even atomic number and odd mass no are abundant
View Answer
C. Isotopes with even atomic number and even mass number are abundant
1 a.m.u =__________________?
Options:
- A. 1.6 x 10-27 kg
- B. 1.6 x 10-24 kg
- C. 1.6 x 10-26 kg
- D. 1.6 x 10-28 kg
View Answer
A. 1.6 x 10-27 kg
The nucleus of an atom of every element will always contain____________________?
Options:
- A. neutrons
- B. protons and electrons
- C. protons
- D. protons and neutrons
View Answer
C. protons
Which of the following is mineral fiber ?
Options:
- A. Teflon
- B. asbestos
- C. saran
- D. acrylic
View Answer
B. asbestos
In the van der Waals equation (P + n2a / v2) (v
Options:
- A. n2a/v correct for the intermolecular forces.
- B. nb correct for the volume occupied by gas molecules.
- C. at high densities the equation reduces to the ideal gas law
- D. all of the above statements are correct.
View Answer
C. at high densities the equation reduces to the ideal gas law