After hitting F12, the rendered image looks pixalated, even if I change the resolution setting to 200%. 
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Increase samples for better render and also increase clamp direct. Both are located in render tab – Yash Mar 08 '19 at 07:03
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White noise is called "fireflies". Read: Hoe to reduce fireflies in cycles and Will increasing samples reduce firefiles? – Mar 08 '19 at 07:19
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Play also with the settings for clamp indirect. See: https://blender.stackexchange.com/questions/40040/fireflies-noise-on-glossy-material/40142#40142 and https://blender.stackexchange.com/questions/96101/problems-with-denoising-in-rendering/97491#97491 – Mar 08 '19 at 07:23
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Yes, it is the noise I was talking about. Thanks @cegaton! – Aniket Das Mar 08 '19 at 07:32