Chemistry - Study Mode
[#1016] The high reactivity of fluorine is due to
Correct Answer
(A) its high electro negativity
Explanation
Solution: The high reactivity of fluorine is due to its high electronegativity.
[#1017] "Paramagnetism" is the property of
Correct Answer
(C) Unpaired electrons
Explanation
Solution: Paramagnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are paramagnetic, although exceptions such as copper exist.
[#1018] The structure of NaCl crystal is
Correct Answer
(B) Face centered cubic
Explanation
Solution: The structure of NaCl crystal is face centered cubic.
[#1019] Which of the following is a natural polymer?
Correct Answer
(D) Starch
Explanation
Solution: Cotton, starch, cellulose and rubber are some of the naturally occurring polymers.Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine. Starch is a member of the basic food group carbohydrates and is found in cereal grains and potatoes. It is also referred to as a polysaccharide, because it is a polymer of the monosaccharide glucose.
[#1020] Plastic is a type of
Correct Answer
(B) Polymer
Explanation
Solution: Plastics are typically organic polymers of high molecular mass and often contain other substances. They are usually synthetic, most commonly derived from petrochemicals, however, an array of variants are made from renewable materials such as polylactic acid from corn or cellulosics from cotton linters.