The question relates to the characteristics of crystal systems, specifically focusing on cubic crystals. To determine the correct relations, let's review the properties of cubic crystals:
- Cubic Crystal System: A cubic crystal is characterized by the following properties:
- The length of the unit cell edges is equal: a = b = c.
- The angles between the edges are all right angles: \alpha = \beta = \gamma = 90^{\circ}.
- Examining the Options:
- Option A: a = b \neq c is incorrect for cubic systems, as all edge lengths should be equal.
- Option B: a = b = c matches the property of cubic crystals that the unit cell edges are equal.
- Option C: \alpha = \beta = \gamma = 90^{\circ} is correct, as all angles in a cubic crystal are 90 degrees.
- Option D: \alpha \neq \beta = \gamma = 90^{\circ} is incorrect as it contradicts the property of equal angles (90 degrees) for cubic crystals.
Therefore, the correct properties of a cubic crystal are reflected in Options B and C, making the correct answer B and C only.
Important Questions from Chemistry (CUET PG) Mixed
- Which of the following atmospheric gas does not dissolve in water at standard temperature and pressure conditions?
- Which of the following physical processes is responsible for the blue color of the sky?
- Arrange the following coal types in the increasing order of their heat content (KJ/kg)
(A). Peat
(B). Lignite
(C). Anthracite
(D). Bituminous
(E) Sub-bituminous
Choose the correct answer from the options given below: - In which of the following layers of atmosphere, does the temperature decrease with the increase in height from the earth's surafce?
(A). Troposphere
(B). Mesosphere
(C). Thermosphere
(D). Stratosphere
Choose the correct answer from the options given below: Choose the correct statement from the following:
(A). Water has highest density at 4°C
(B). Freezing point of water is 0°C
(C) An Ice cube does not completely dip in water, rather floats on water in a glass.
(D). Addition of common salt reduces freezing point of water.
Choose the correct answer from the options given below:
