Which isotope of hydrogen emits a $\beta-$particle?

The nucleus of tritium contains

Which of the following statements is not correct?

Given below are two statements:
Statement $I$ : Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement $II$ : Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements,choose the most appropriate answer from the options given below:

What is obtained by the reaction of $HCOOH$ with concentrated $H_2SO_4$?

Out of the two allotropic forms of dihydrogen,the form with lesser molecular energy is