Tag: chemistry

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Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Which of the following statement(s) is/are true?

  1. Among all the naturally occurring elements, around 80% are metals

  2. Non-metals are more abundant than metals

  3. Sodium and potassium are soft like wax

  4. Bromine is a reddish brown liquid at room temperature
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

In general, elements located in the left two-thirds of the periodic table are metals, and the non-metals are on the right side of the table. 


There are about 98 elements in the periodic table that are found naturally. among which 10 are found in traces. Out of these 98 elements, 13 are non-metals and are metalloids. Thus, 78 are metals out of 98. hence about 80 per cent of all the naturally occurring elements are metals.

Sodium and potassium metals are soft and can be easily cut by a knife.

Bromine is a non-metal and is reddish-brown in colour as liquid and as gas.

Therefore, option $A, C, D$ are correct.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Metals and non- metals are separated by a zig - zag line.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True.

The elements that touch the zigzag line are classified as metalloids. The elements in the far upper right corner are classified as nonmetals. Elements in the first group have one outer shell electron and are extremely reactive. They are called alkali metals.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Non-metal used in packing of potato chips in:

  1. Carbon.

  2. nitrogen.

  3. oxygen

  4. Chlorine.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Potato chip bags are not full of air, but of nitrogen gas. This is done to prevent the chips from oxidizing, which is part of what makes them go stale. Oxygen is very reactive, and likes to combine with other molecules whenever it can, causing chemical changes to take place.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

A purpled coloured non-metal forms a brown solution in alcohol which is applied on wounds as antiseptic . Which non metal is this?

  1. Sulphur

  2. Chlorine

  3. Oxygen

  4. Iodine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A purple coloured non-metal which forms a brown solution in alcohol, which is applied on wounds as an antiseptic is iodine. It is also known as tincture iodine. It is basically a weak solution of iodine with only 2 to 7 % iodine dissolved in asolution of water and ethanol along with potassium or sodium iodide.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

When Amrita was asked to pick up a few articles from a collection, she picked up the following:
Wooden scale, glass test tube, paper basket.


Which article is she most likely to pick up next?

  1. Steel cup

  2. Iron chain

  3. Rubber gloves

  4. Copper wire
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wooden scale, glass test tube, paper basket are all non-metals and a poor conductor of electricity and Rubber gloves are similar to these. Also if she is doing any lab work as Wooden scale, glass test tube, paper basket are usually composed of carrying out some experiment then she would need a rubber glove.

Hence, option C is correct.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

The most abundant element in the universe is:

  1. helium

  2. oxygen

  3. silicon

  4. hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen is more plentiful than any other element making up about 3/4th the mass of the universe. Helium is second making up almost all of the remaining $25\%$. Oxygen is third most abundant element of universe. On earth, oxygen is the most common element making up about $47\%$ of earth's mass.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

The metallic element present in chlorophyll is:

  1. $Hg$
  2. $Fe$
  3. $Mg$
  4. $Ni$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1) Chlorophyll contains a magnesium ion, encased in a large ring structure known as a chlorine.

 2) The chlorine ring is a heterocyclic compound derived from pyrrole. 

3) Four Nitrogen atoms from the chlorine surround and bind the magnesium atom.