HSC Science (General) ११ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

Solve the following problem:

Perform the following calculation. Round off your answer to three digits.

`((9.28xx10^9)(9.9xx10^-7))/((511)(2.98xx10^-6))`

A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?

Solve the following problem:

Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:

12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.

State which of the measurements you would accept, giving the reason.

Solve the following problem:

Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:

12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.

Give your reason for rejecting each of the others.

Solve the following problem:

What weight of calcium oxide will be formed on heating 19.3 g of calcium carbonate?
(At. wt.: Ca = 40; C = 12; O = 16)

Solve the following problem:

The hourly energy requirements of an astronaut can be satisfied by the energy released when 34 grams of sucrose are “burnt” in his body. How many grams of oxygen would be needed to be carried in space capsule to meet his requirement for one day?

Choose the correct option.

p-orbitals are _________ in shape.

Choose the correct option.

“No two electrons in the same atoms can have identical set of four quantum numbers”. This statement is known as -

Choose the correct option.

Principal Quantum number describes -

State Heisenberg uncertainty principle.

Give the names of quantum numbers.

Define the term Electronic configuration.

State and explain Pauli’s exclusion principle.

State Hund’s rule of maximum multiplicity with a suitable example.

State the order of filling atomic orbitals following Aufbau principle.

Explain the anomalous behaviour of copper.

Explain the anomalous behaviour of chromium.

Write orbital notations for the electron in orbitals with the following quantum numbers.

n = 2, l = 1

Write orbital notations for the electron in orbitals with the following quantum numbers.

n = 4, l = 2

Write orbital notations for the electron in orbitals with the following quantum numbers.

n = 3, l = 2