NON-MEATALS, B. Hydrogen and its Compounds

1. An element X has four electrons in its outermost orbit. What will be the formula of its compounds with Hydrogen? [43rd B.P.S.C. (Pre) 1999]

(a)
(b)
(c)
(d)

(a)
(b)
(c)
(d)

Correct Answer: (d)

Solution:

2. According to weight, the percentage of Hydrogen in water (H₂O), is — [Uttrakhand U.D.A./L.D.A. (Mains) 2006]

(a) 44.45%
(b) 5.55%
(c) 88.89%
(d) 11.11%

Correct Answer: (d) 11.11%

Solution:Percentage of composition is the percent by mass of each element present in a compound.

In water H₂O, = 2+16 =18 g/mol

Number of Hydrogen atoms present in water = 2

Percentage of Hydrogen in water =

3. One mole of hydrogen gas burns in excess of oxygen to give 290 kJ of heat. What is the amount of heat produced when 4g of Hydrogen gas is burnt under the same conditions? [I.A.S. (Pre) 1994]

(a) 145 kJ
(b) 290 kJ
(c) 580 kJ
(d) 1160 kJ

Correct Answer: (c) 580 kJ

Solution:Explanation:

1 Mole of (Hydrogen) = 2 gm

Energy released by 4 gm = $580$ kJ

4. Burning of hydrogen produces — [47th B.P.S.C. (Pre) 2005]

(a) Oxygen
(b) Ash
(c) Soil
(d) Water

Correct Answer: (d) Water

Solution:Hydrogen gas is highly flammable and burns in air over a wide concentration range of 4% to 75%. When it burns with oxygen, it produces water.

5. Which one of the following fuels causes minimum air pollution? [U.P. Lower Sub. (Pre) 2015]

(a) Kerosene oil
(b) Hydrogen
(c) Coal
(d) Diesel

Correct Answer: (b) Hydrogen

Solution:Hydrogen is the purest combustion fuel. Burning hydrogen generates water. Fossil fuels like coal, kerosene, and diesel release carbon dioxide and harmful gases when burned.

6. Heavy water is a type of — [U.P.P.C.S. (Pre) 1993]

Correct Answer: (e) Coolant & Moderator

Solution:Heavy water (D₂O) deuterium oxide is used as a moderator as well as a in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of hydrogen which comprises both a neutron and a proton. Deuterium or heavy hydrogen reacts with oxygen to form deuterium oxide (D₂O) also known as heavy water. Normal water (H₂O) also used as a moderator as well as a coolant in nuclear reactors

7. The chemical formula for heavy water is — [66th B.P.S.C. (Pre) (Re. Exam) 2020]

(a) H₂O
(b) N₂O
(c) D₂O
(d) CuO

Correct Answer: (c) D₂O

Solution:Heavy water (D₂O) deuterium oxide is used as a moderator as well as a in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of hydrogen which comprises both a neutron and a proton. Deuterium or heavy hydrogen reacts with oxygen to form deuterium oxide (D₂O) also known as heavy water. Normal water (H₂O) also used as a moderator as well as a coolant in nuclear reactors

8. The chemical formula of Heavy Water is — [Jharkhand P.C.S. (Pre) 2003]

(a) H₂O
(b) D₂O
(c) H₂CO₃
(d) H₂S

Correct Answer: (b) D₂O

Solution:Heavy water (D₂O) deuterium oxide is used as a moderator as well as a in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of hydrogen which comprises both a neutron and a proton. Deuterium or heavy hydrogen reacts with oxygen to form deuterium oxide (D₂O) also known as heavy water. Normal water (H₂O) also used as a moderator as well as a coolant in nuclear reactors

9. The substance used as moderator and coolant both, in nuclear reactors is — [U.P. P.C.S. (Pre) 2016]

Correct Answer: (e)Ordinary & Heavy water

Solution:Heavy water (D₂O) deuterium oxide is used as a moderator as well as a in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of hydrogen which comprises both a neutron and a proton. Deuterium or heavy hydrogen reacts with oxygen to form deuterium oxide (D₂O) also known as heavy water. Normal water (H₂O) also used as a moderator as well as a coolant in nuclear reactors

10. What is heavy water? [M.P.P.C.S. (Pre) 1991]

(a) Oxygen + Heavy Hydrogen
(b) Hydrogen + Oxygen
(c) Hydrogen + New Oxygen
(d) Heavy Hydrogen + Heavy Oxygen

Correct Answer: (a) Oxygen + Heavy Hydrogen

Solution:Heavy water (D₂O) deuterium oxide is used as a moderator as well as a in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of hydrogen which comprises both a neutron and a proton. Deuterium or heavy hydrogen reacts with oxygen to form deuterium oxide (D₂O) also known as heavy water. Normal water (H₂O) also used as a moderator as well as a coolant in nuclear reactors

NON-MEATALS, B. Hydrogen and its Compounds

1. An element X has four electrons in its outermost orbit. What will be the formula of its compounds with Hydrogen? [43rd B.P.S.C. (Pre) 1999]

2. According to weight, the percentage of Hydrogen in water (H₂O), is — [Uttrakhand U.D.A./L.D.A. (Mains) 2006]

3. One mole of hydrogen gas burns in excess of oxygen to give 290 kJ of heat. What is the amount of heat produced when 4g of Hydrogen gas is burnt under the same conditions? [I.A.S. (Pre) 1994]

4. Burning of hydrogen produces — [47th B.P.S.C. (Pre) 2005]

5. Which one of the following fuels causes minimum air pollution? [U.P. Lower Sub. (Pre) 2015]

6. Heavy water is a type of — [U.P.P.C.S. (Pre) 1993]

7. The chemical formula for heavy water is — [66th B.P.S.C. (Pre) (Re. Exam) 2020]

8. The chemical formula of Heavy Water is — [Jharkhand P.C.S. (Pre) 2003]

9. The substance used as moderator and coolant both, in nuclear reactors is — [U.P. P.C.S. (Pre) 2016]

10. What is heavy water? [M.P.P.C.S. (Pre) 1991]

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