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Which statement is wrong?
[1] The atomic weight of carbon is about 12.
[2] The most stable ion of lithium is Li+ .
[3] A phosphorus atom is larger than an antimony atom.
[4] The radius of a sodium atom is larger than that of a sodium cation.
[5] Oxygen has a less negative electron affinity than fluorine.
Only two gallium isotopes are naturally occurring, 69Ga (mass = 68.9256 amu) and 71Ga (mass = 70.9247 amu). The atomic mass of gallium is 69.72. What percent of the gallium atoms (% abundance) is the heavier isotope?
[1] 36 %
[2] 38 %
[3] 40 %
[4] 59 %
[5] 61 %
A random sample of 900 members is found to have a mean of 4.45 CM can it be reasonably regarded as a sample from a large population whose mean is 5 cm and variance is 4 cm square obtain the 95% confidence limit for the mean in the population
A bottle containing a greenish substance was labelled ferric chlorate. The material in this bottle is made up of:
[1] Fe2+ and ClO3 2- ions.
[2] Fe3+ and ClO2 - ions.
[3] Fe3+ and ClO3 - ions.
[4] Fe2+ and ClO4 - ions.
[5] F + and ClO2 - ions.
Which one of the following pairs are isotopes?
[1] O2 and O3
[2] 3517Cl and 3717Cl
[3] I2 (g) and I2 (s)
[4] Mg2+ and Ne
[5] F + and F-
Describe and illustrate the characteristics of an object? What is the syntax for a multi dimensional array and a two dimensional array ?
A 5.2 cm3 of a metal is found to weigh 46.6 g on a three-decimal balance. What is the density of the metal, expressed to the proper number of significant figures?
[1] 9 g/cm3 [2] 9.0 g/cm3
[3] 8.96 g/cm3
[4] 0.11 g/cm3
[5] 0.112 g/cm3
• Create class passenger, bus and seat. Each Seat object has three attributes, i.e., seat number, availability flag (1 if the seat is available, 0 otherwise), and an occupant (empty string is the seat is still available, otherwise a Passenger object).
• Each Passenger has a name and can purchase a Seat in a Bus. purchase_seat function needs a seat number (not a Seat object) and the Bus object. If that particular seat is available (as indicated by its availability flag), it will be assigned to that passenger.
• Each object of Bus class is composed of 24 Seat objects. Bus object also has a ticket price per seat attribute and a total booking amount attribute. Use a loop in the constructor to create 24 Seat objects. As seats are purchased by passenger, their ticket price is added to total booking amount attribute. Bus has a display function in which each Seat object of the Bus calls display function of Seat class.
• Create a Bus object, and two passenger objects. Both passengers try to buy seat 15
Which one of the statements below about mixtures is correct?
[1] The different substances in a mixture are always in a definite proportion to each other. [2] A mixture is made up of elements that are chemically combined.
[3] A mixture must contain at least two different substances.
[4] It is extremely difficult to separate a mixture into different substances.
[5] A mixture is always homogeneous
A large urban HMO purchases a vacant office building to house expanded administrative functions for $500,000. The accountant, working with their real estate agent, has estimated the value of the land at $125,000, with the remaining cost of $375,000 value for the building. Prior to using the building, renovations costing $100,000 are completed. The renovated building has an estimated useful life of 27.5 years, with no residual value. What is the annual charge for depreciation?
