Questions

Mixtures are combination of two or more substances physically which can be separated in to the original.

Matter can be breakdown into two categories. 

1) Pure substances 

2) Mixtures

Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.

They are carried eastwards to West Bengal and Assam by westerly winds

The Union Minister for Science & Technology Dr. Harsh Vardhan has launched a mobile app “Celebrating Yoga” in New Delhi to connect people through Yoga for scientific healthy living. The mobile app has been developed by Department of Science & Technology on the occasion of International Yoga Day (IYD) 2017. The aim of the app is to popularize Yoga and encourage people to practice yoga for a scientifically healthy living.

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The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.

So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.

But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.

A term used interchangeably with diskette is Floppy disk.