Choose the correct option -
(i) The solution in water of which of the following will be acidic
(a) Na2O (b) CO2
(c) MgO (d) H2O
(ii) Which of the following elements does not exhibit allotropy
(a) Sodium (b) Oxygen
(c) sulphur (d) phosphorus
(iii) Which among the following is a metalloid
(a) oxygen (b) helium
(c) magnesium (d) arsenic
(iv) Noble gases do not react with other elements because
(a) They are monoatomic gases (b) Their atomic size is small
(c) Their outermost shell is full (d) They are found in abundant amounts
(v) The gas obtained on heating potassium permanganate is
(a) nitrogen (b) oxygen
(c) hydrogen (d) helium
(i) The solution in water of which of the following will be acidic
(a) Na2O (b) CO2
(c) MgO (d) H2O
(ii) Which of the following elements does not exhibit allotropy
(a) Sodium (b) Oxygen
(c) sulphur (d) phosphorus
(iii) Which among the following is a metalloid
(a) oxygen (b) helium
(c) magnesium (d) arsenic
(iv) Noble gases do not react with other elements because
(a) They are monoatomic gases (b) Their atomic size is small
(c) Their outermost shell is full (d) They are found in abundant amounts
(v) The gas obtained on heating potassium permanganate is
(a) nitrogen (b) oxygen
(c) hydrogen (d) helium
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Verified answer
1. b) CO₂ is acidic in nature.2.a) Sodium
3. d) Arsenic
4.. c) Their outermost shell is full
5. b) oxygen
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Verified answer
1. CO22. Sodium
3. Arsenic
4. Noble gases do not react with other elements as their outermost shell is full, so, they do not need or do not want to give their electrons.
5.Oxygen
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