Which of the following statements is/are...

Which of the following statements is/are true?

All chordates are ventebrates

All vertebreates are chordates

All chordates are not vertebrates

Both b and c

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Which of the following statement is/are true ?

`Cu^(2+)` salts form soluble complex with excess KCN

`Cu^(2+)` salts form soluble complex with aqueous ammonia

`Cu^(2+)` salts form soluble complex with KI

A piece of iron or zinc when place in `Cu^(2+)` salt solution, precipitates copper

All alkali metals are soft and can be cut with knife

Alkali metals do not occur in free state in nature

Alkali metals are highly electropositive elements

Alkali metal hybrides are covalent in character

(a) For endothermic reactions, energy of activation is always greather than heat of reaction

(b) For endothermic reactions, energy of activation is always smaller than heat of reaction

(c ) Rate of reaction always increases with in temperature

(d) Temperature coefficient of a reaction is given by `K_(t-10)/K_(t)`