Question

PLS ANSWER QUICKLY!!!!!!!

1.C, N, O.
NAME THE ELEMENT THAT HAS THE LARGEST AND SMALLEST ATOMIC RADII IN THE ELEMENTS ABOVE. ALSO GIVE REASON FOR YOUR ANSWER.

2. NAME A METAL THAT OCCURS IN FREE STATE.

3. A TEST CONTAINS BROWN LIQUID IN IT. THE COLOUR OF THE LIQUID REMAINS THE SAME WHEN METHANE IS PASSED THROUGH IT BUT DISAPPEARS WHEN ETHENE IS PASSED. SUGGEST THE NAME OF THE BROWN COLOUR LIQUID AND ALSO WRITE THE CHEMICAL EQN.

4. AN AQUEOUS SOLUTION OS AMMONIUM CHLORIDE SALT IS ACIDIC IN NATURE WHILE THAT OF SODIUM CHLORIDE IS BASIC IN NATURE. WHY?

5. WHAT HAPPENS TO HE CRYSTALS OF WASHING SODA WHEN EXPOSED TO AIR? NAME THE PHENOMENA INVOLVED.

Answer 1

1. Largest atomic radii - Carbon

Reason - When we move left to right in a period the atomic radius decreases because of addition of new electron thus increasing the electrostatic force and decreasing atomic radius.

Smallest atomic radii- Oxygen

Reason - As mentioned above.

2.Gold is a metal that occurs in free state because it is one of the least reactive metals.

3. The brown colour liquid is bromine water.

Reason - Methane is saturated compound which does not decolourise the colour of bromine water but unsaturated compound such as ethene decolourises it.

Equation : - C2H4 + Br2 ==> CH2Br2 + H2.

4. An aqeuous solution of ammonium chloride is acidic in nature because it is an acidic salt in which the base is ammonium hydroxide which is a weak base and acid is hydrogen chloride which is a strong acid. Since the salt is made up of a weak base and strong acid it's aqeuous solution is acidic.

Sorry but sodium chloride is neutral not basic.

5. When crystals of washing soda are exposed to air then they lose the 10 molecules of water of crystallisation and forms anhydrous washing soda which is white in colour and also called 'soda ash'.

The phenomena is called efflorescence.

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