Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 questions · page 31 of 68
- A. Sb
- B. N
- C. P
- D. As
Explanation: The decreasing order of electronegativity of Group-VA element is:N>P>As>Sb>Bi,where Nitrogen is the most electronegative element.
Correct answer: N- A. Sb
- B. As
- C. N
- D. P
Explanation: The nitrogen which exists free in nature which is made up of 78% of Earth atmosphere and naturally found in mineral deposits, soil and…
Correct answer: N- A. SbCl3
- B. NCl3
- C. NI3
- D. NCl5
Explanation: NCl5 does not exist because there are no d-orbitals in the second energy level.
Correct answer: NCl5- A. N2O5
- B. N2O
- C. NO
- D. N2O4
Explanation: Nitrous oxide, commonly known as laughing gas or happy gas, is a colorless, non-flammable gas.
Correct answer: N2O- A. N2O
- B. N2O4
- C. N2O3
- D. N2O5
Explanation: NO is oxidised by ozone in the atmosphere, on a time scale of tens of minutes, to give NO2.
Correct answer: N2O4- A. NO2
- B. NO
- C. N2O
- D. N2O4
Explanation: Nitric acid has a yellowish-brownish colour due to the presence of gaseous nitrogen oxides dissolved in it.
Correct answer: NO2- A. AuCl2
- B. AuCl
- C. AuCl3
- D. None
Explanation: The name aqua regia was coined because this solution can dissolve gold which is known as the king of metals.
Correct answer: AuCl3- A. H3PO4
- B. HPO2
- C. H2PO3
- D. H3PO3
Explanation: Red phosphorus react with nitric acid to produce phosphoric acid, nitrogen dioxide and water.
Correct answer: H3PO4- A. K2Cr2O7 + S + White P
- B. K2Cr2O7 + K + S
- C. S and K
- D. Sb2S3
Explanation: The head of a match uses antimony trisulfide for fuel. Potassium chlorate helps that fuel burn and is basically the key to ignition, while…
Correct answer: K2Cr2O7 + S + White P- A. 4
- B. 6
- C. 8
- D. 2
Explanation: Finally, we need to count the number of electrons in the valence shell.
Correct answer: 8- A. H4P2O7
- B. PO4-3
- C. H3PO3
- D. H3PO4
Explanation: It can have a +3 oxidation state when it shares its three electrons with the atoms more electronegative than it.
Correct answer: H3PO3- A. Fe
- B. O
- C. Si
- D. C
Explanation: Oxygen is by far the most abundant element in the Earth's crust, making up 46% of mass-coming up just short of half of the total.
Correct answer: O- A. N2O5
- B. N2O3
- C. NO2
- D. NO
Explanation: The brown gas formed when HNO_3 is reduced by metal to form nitrogen dioxide which is a poisonous brown gas with an irritating odour.
Correct answer: NO2- A. O2-1
- B. O2+2
- C. O2-2
- D. O2
Explanation: There are two unpaired electrons in a neutral atom of oxygen in a grounded state.
Correct answer: O2- A. Jabir-Bin-Hayan
- B. Knietsch
- C. Al-Khwarzmi
- D. Mendleeve
Explanation: Contact process is one of the most popular or common methods to manufacture sulphuric acid.
Correct answer: Knietsch- A. N2O
- B. NO
- C. NO2
- D. N2O4
Explanation: The O.S of N is → +2N2OThe O.S of Nitrogen is → +1NO2The O.S of Nitrogen is → +4NH3The O.S of Nitrogen is → -3
Correct answer: N2O- A. Bone black
- B. Graphite and clay
- C. Lead oxide
- D. Lead peroxide
Explanation: The pencil "lead" is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder.
Correct answer: Graphite and clay- A. Al2O3
- B. Al2O3 . H2O
- C. Al2O3 . 2H2O
- D. Al2O3 . 3H2O
Explanation: Al(OH)3, is one of the mineral forms of aluminium hydroxide. It is often designated as γ-Al(OH)3 (but sometimes as α-Al(OH)3).
Correct answer: Al2O3 . 3H2O- A. N
- B. P
- C. Sb
- D. Bi
Explanation: Among VA group elements, the element which has highest ionization energy is nitrogen.The ionization energy of VA group elements decreases…
Correct answer: N- A. Sb
- B. N
- C. P
- D. As
Explanation: Explanation for this question will be added soon!
Correct answer: N