Can the Nikkor 35mm 1.8G be used as a macro lens, if I use it with a reversing ring ?
Yes, it can; pretty much any lens can, given a wide enough focal length. A 50mm lens will give you a 1:1 reproduction ratio (the magic 'macro' ratio), which means the image on the sensor will be life size. The wider the lens, the bigger the ratio, so a 35mm lens will give you a good macro shot (at least in terms of magnification). An 18-55mm kit lens will give you a huge 4:1 ratio @ 18mm.
You will need to hold the the aperture lever on the reverse of the lens open in order to take decent shots. You can do this by hand or with some poster tack. Check out the Photo SE blog article on reversing rings for more tips.