Which bitwise operator is suitable for turning off a particular bit in a number?

Which bitwise operator is suitable for turning off a particular bit in a number?

2) Consider the following statements:

 int a=2, b=3, c=4;
 a=(b++) +c;
 b=a+(++c);

3) What is the output of this C code?

 #include <stdio.h>
     void main()
     {
         1 < 2 ? return 1: return 2;
     }

4) What is the output of this C code?

 #include <stdio.h>
     int main()
     {
         int i = 5;
         i = i / 3;
         printf("%d\n", i);
         return 0;
     }

5) IF I=6, and J=++I, then the value of J and I will be: