Explore topic-wise InterviewSolutions in Current Affairs.

a. Arsenic forms sodium arsenide (Na₃As₂) with sodium.

2As (Arsenic) + 3Na (Sodium) → Na₃As₂ (Sodium arsenide)

b. Bismuth forms magnesium bismuthide (Mg₃Bi₂) with magnesium.

2Bi (Bismuth ) + 3Mg (Magnesium) → Mg₃Bi₂ (Magnesium bismuthide) 

Ellingham diagram: 

The graphical representation showing the variation of Gibbs energy with increase of temperature for the formation of oxide (oxidation) is known as Ellingham diagram.

OR 

The Ellingham diagram is the plot of free energy change ΔG^o against temperature for the reaction of a metal and other elements with one mole of gaseous oxygen at 1 atmosphere. 

Features of Ellingham diagram: 

The Ellingham diagram for oxides shows the following important features: 

a. The graph for the formation of a metal oxide is a straight line with an upward slope. 

b. There is sudden change in the slopes for some metal oxides, like MgO, ZnO and HgO. 

c. For a few metal oxides of mercury and silver, the graph is at the upper part in Ellingham diagram (Ag₂O and HgO). 

d. The graph for the formation of CO is straight line with the negative slope. This line intersects the lines of many metal oxides. 

e. The graph for the formation of CO₂ is straight line almost parallel to the temperature axis.

a. The enthalpy change that accompanies the conversion of one mole of solid directly into its vapour at constant temperature and pressure is called its enthalpy of sublimation (Δ_subH).

b. Whether the conversion of solid to vapour takes place directly in one step or in two steps (i.e., first melting of solid into liquid and then its vaporization), the enthalpy change is the same because enthalpy is a state function. 

Therefore, 

Δ_subH = Δ_fusH + Δ_vapH

Where Δ_fusH is enthalpy of fusion and Δ_vapH is enthalpy of vaporization.

Correct answer is (b) Charge

(a) decreases

Correct answer is (a) increases

Answer: b) Trehalose 

(i) Energy is a basic requirement for economic development.

(ii) Every sector of the national economy needs input of energy.

(iii) Consumption of energy in all forms has been steadily rising all over the country.

(iv) Rising prices of oil and gas and their potential shortage have raised uncertainties about the security of energy supply in future.

Energy can be generated from fuel minerals like coal, petroleum, natural gas, uranium and from electricity.

The law of the constancy of interfacial angles (or 'first law of crystallography') states that the angles between the crystal faces of a given species are constant, whatever the lateral extension of these faces and the origin of the crystal, and are characteristic of that species.

Both are flammable gasses.. Both are basic.   

The odours are not the same  

They are not acidic

Bi is the more metallic.

 carbon and silicon mostly form covalent compounds due to their 4 valence electrons.

The correct answer is Chhichhila.

• Chhichhila Wild Life Sanctuary (Haryana) area is  28.92 hectares (71.5 acres).
• Khol Hi - Raitan Wild Life Sanctuary (Haryana) area is  2226.58 hectares.
• Bir Shikargarh Wild Life Sanctuary (Pinjore, Haryana) area is 767.30 hectares.
• Khaparwas Wild Life Sanctuary area is 82.70 hectares.

Haryana State's Emblems:

• State Tree - Pipal, Peepul or Bo tree (Ficus religiosa)
• State Flower - Lotus.
• State Animal - Black Buck (Antelope).
• State Bird - Black Francolin.

Manas National Park or Manas Wildlife Sanctuary is a national park, UNESCO Natural World Heritage site, a Project Tiger reserve, an elephant reserve and a biosphere reserve in Assam.

The correct answer is 4 only.

• Tides are caused by the earth, moon, and sun's gravitational pull and their position.
• Tidal flows are of great importance in navigation and help the navigators and fishermen plan their activities. Hence, Statement 1 is correct.
• Harbors near rivers and within estuaries having shallow ‘bars’ at the entrance prevent ships and boats from entering into the harbor.
• Tides are also helpful in desilting the sediments and in removing polluted water from river estuaries. Hence, Statement 2 is correct.
• Tides are used to generate electrical power as their mechanical energy is used to drive a turbine that produces electricity. Hence, Statement 3 is correct.
• Tides vary in frequency, direction, and movement from place to place and also from time to time.
• Tides may be grouped into various types based on their frequency of occurrence in one day or based on their height.
• Tides based on the Sun, Moon, and the Earth Positions.
• The height of rising water varies depending upon the position of the sun and moon concerning the earth.
• The ‘tide generating force is the difference between the gravitational attraction of the moon and the centrifugal force. 
• The shape of bays and estuaries along a coastline can also magnify the intensity of tides.
• Funnel-shaped bays greatly change tidal magnitudes.
• It is not as such use in the Development of Coral Reefs. Hence, Statement 4 is incorrect.

The correct answer is Jharkhand.

• ​Dalma Wildlife Sanctuary is located in Jharkhand.
• Recently, the annual hunting festival of the tribal community was observed in a 'bloodless and symbolic' manner in and around the sanctuary. 
• The 2017 hunting festival ‘Bishu Parv' of the tribal community was observed in Jharkhand.
• To observe the fest peacefully, the awareness campaign was launched by the forest department.

• Gautam Buddha Wildlife Sanctuary (1976).
• Hazaribagh  Wildlife  Sanctuary (1976).
• Koderma Wildlife Sanctuary (1985).
• Lawalong Wildlife Sanctuary (1978).
• Mahuadanr Wildlife Sanctuary (1976).
• Palamau Wildlife Sanctuary (1976).
• Palkot Wildlife Sanctuary (1990).
• Parasnath Wildlife Sanctuary (1984).

The Correct Answer is "Narmada".

• Narmada River flows from Amarkantak, Anuppur district, Madhya Pradesh.
• The Narmada also called the Rewa and previously also known as Nerbudda, even Shankari, is a river in central India and the sixth-longest river in the Indian subcontinent.
• It is the third-longest river that flows entirely within India, after the Godavari, and the Krishna.
• It is also known as the "Life Line of Gujarat and Madhya Pradesh" for its huge contribution to the state of Gujarat and Madhya Pradesh in many ways.
• Narmada rises from Amarkantak Plateau near Anuppur district.
• It forms the traditional boundary between North India and South India and flows westwards over a length of 1,312 km before draining through the Gulf of Khambhat into the Arabian Sea, 30 km west of Bharuch city of Gujarat.
• River Narmada emerges from Amarkantak Hill of Maikal Range.
• Damodar originates in Chandwa on the Chota Nagpur Plateau.
• The Tapi River originates in the Betul district. 

• Amarkantak is a hill station and a pilgrim town and a Nagar Panchayat in Anuppur, Madhya Pradesh, India.
• The Amarkantak region is a unique natural heritage area and is the meeting point of the Vindhya and the Satpura Ranges, with the Maikal Hills being the fulcrum.
• This is where the Narmada River, the Son River, and Johila River emerge. 

The Correct Answer is "Madhya Pradesh".

• Sanchi Stupa is a historic site of Sanchi in Madhya Pradesh state, India.
• It is one of the oldest Buddhist monuments in the country and the largest stupa at the site.
• The Great Stupa (also called stupa no. 1) was originally built in the 3rd century BCE by the Mauryan emperor Ashoka and is believed to house the ashes of the Buddha.
• The building is 120 feet (37 meters) wide and 54 feet (17 meters) high.
• The Great Stupa and Sanchi’s other Buddhist monuments were collectively designated a UNESCO World Heritage site in 1989.

• The central structure consists of a hemispherical dome on a base, with a deep chamber within.
• The dome symbolizes, among other things, the dome of heaven enclosing the earth.
• It is surmounted by a squared railing that can be said to represent the world mountain.
• A central pillar (Vashti) symbolizes the cosmic axis and supports a triple umbrella structure, which is held to represent the Three Jewels of Buddhism—the Buddha, the dharma (doctrine), and the sangha (community).
• A circular terrace (Medhi), enclosed by a railing, surrounds the dome, on which the faithful are to circumambulate in a clockwise direction.
• The entire structure is enclosed by a low wall (vedika), which is punctuated at the four cardinal points by toranas (ceremonial gateways).

The work done by the force will be equal to the potential energy gained by the mass. 

Let L be the length of the string , 

F.d= MgL (1 -cos45 ) 

The horizontal displacement of the mass is d= L sin 45 

F L sin45 = Mg L(1 - 45) 

F = Mg (√2 - 1)