With respect to the conformers of ethane...

With respect to the conformers of ethane , which of the following statements is true ?

Bond angle remains same but bond length changes

Bond angle changes but bond length remains same

Both bond angle and bond length change

Both bond angles and bond length remain same

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Which of the following statement is true ?

If A={1,2,3,4,} and R={1,1), (2,2),(2,3), (1,2) } then the relation R on set A is reflexive.

Let A ={a,b,c,d) and a relation R on A be defined as follows :
R={a,c), (b,d), (b,c), (c,a), (d,b) }
Then R is a symmetric relation on A.

A reflexive relation defined on a non-empty set A is always symmetric.

The universal relation defined on a non-empty set A is transitive.

`**` defined by `a**b=(a+b)/(2)` is a binary operation on `ZZ`

`**` defined by `a**b=(a+b)/2` is a binary operation on `QQ`

all binary commutative operations are associative

Subtraction is a binary operation on `NN`

entropy increases when water vaporises

randomness decreases in the fusion of ice

randomness increases in the condensation of water vapour

randomness remains unchanged during vaporisation of water