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Correct answer is 2

Here,

Metal oxide is obtained by two different methods; 

Reactions of metal with oxygen and reaction of metal with water vapour (steam). 

In first reaction (reaction with oxygen), 

The mass of oxygen in metal oxide = 3.2 – 2.0 

= 1.2 g

% of oxygen = \(\frac{1.2}{3.2}\) x 100 = 37.5%

% of metal = \(\frac{2.0}{3.2}\) x 100 = 62.5%

In second reaction (reaction with steam),

The mass of oxygen in metal oxide = 2.27 – 1.42 

= 0.85 g

% of oxygen = \(\frac{0.85}{2.27}\) × 100 = 37.44 ≈ 37.5%

% of metal = \(\frac{1.42}{2.27}\) × 100 = 62.56 ≈ 62.5%

Therefore,

Irrespective of the source, 

The given compound contains same elements in the same proportion. 

The law of definite proportions states that “A given compound always contains exactly the same proportion of elements by weight”.

Hence,

The law of definite proportions is verified by these data.

सही विकल्प है (ग) कुत्ता खड़ा था।

सही विकल्प है (ख) गलती से एक किताब के फ्लैप पर उसकी जन्म तारीख छप गई थी।

सही विकल्प है (ग) उनका जन्मदिन चार साल में एक बार आता है।

फिरकापरस्त होना यानी जाति, संप्रदायवादी होना और फिकरापरस्त होना यानी किसी को लगनेवाली कोई बात मुंह से निकालना दोनों ही बरा माना जाता हैं और उनका नुकसान भुगतना पड़ता है। कहा गया है, बात का वार तलवार के वार से भी घातक होता है। लेखक अपनी फिकरापरस्ती का दोष खुद स्वीकार करते हैं और उसका परिणाम भुगतने में हिचकते नहीं।

अनेक लोग ऐसे हैं, जिन्हें अभावों मे जीना पड़ता हैं। इन्हें झुग्गी-झोंपड़ियों में रहना पड़ता है, जहाँ सांप, बिच्छू निकलते हैं। इन्हें भरपेट खाना नहीं मिलता। इन परेशानियों में ऐसे लोगों को जीने की इच्छा नहीं रह जाती, फिर भी लोग जीने की इच्छा न रहते हुए मजबूरी में जीवित रहते हैं।

लेखक के अनुसार जन्मदिन मनाना और अभिनंदन करना पाश्चात्य अंधानुकरण का एक नमूना है। वे कहते हैं कि जन्मदिन की बधाई देनी ही हो, तो उन लोगों को देनी चाहिए, जो लोग झोंपड़ों में रहते हैं, सुविधाओं से वंचित हैं, और जिन्हें भरपेट खाना नहीं मिलता। वे लोग जो रोज मरने को होते हैं, पर मौत को जीत लेते हैं और एक साल और खींच ले जाते हैं, मरते नहीं। जन्मदिन की बधाई उन्हें देनी चाहिए। कहीं-कहीं तो जन्मदिन का अभिनंदन करना धंधा भी होता है। पैसा जमा होता और खाया जाता है। ऐसे जन्मदिन अभिनंदन का कोई अर्थ नहीं है।

बुजुर्ग मित्र पहली अप्रैल को पैदा हुए थे। पहली अप्रैल को ‘अप्रैल-फूल’ दिन माना जाता है। अखबार में सूचना छपाने और कार्ड बांटने के बावजूद उनके जन्मदिन समारोह में कोई नहीं आया। लोग समझते थे कि उन्हें अप्रैल-फूल बनाया जा रहा है। इसलिए बुजुर्ग मित्र को जन्मदिन मनाने में तकलीफ हुई।

Aspirin and paracetamol are the two drugs that reduce body pain.

i. Antiseptics are used to sterilise surfaces of living tissue when the risk of infection is very high, such as during surgery or on wounds. 

ii. Commonly used antiseptics include inorganics like iodine and boric acid or organics like iodoform and some phenolic compounds.

e.g.

• Tincture of iodine (2-3% solution of iodine in alcohol-water mixture) and iodoform serve as powerful antiseptics and is used to apply on wounds.
• A dilute aqueous solution of boric acid is a weak antiseptic used for eyes.
• Various phenols are used as antiseptics. A dilute aqueous solution of phenol (carbolic acid) is used as antiseptic; however, phenol is found to be corrosive in nature. Many chloro derivatives of phenols are more potent antiseptics than the phenol itself. They can be used with much lower concentrations, which reduce their corrosive effects.
• Two of the most common phenol derivatives in use are trichlorophenol (TCP) and chloroxylenol (which is an active ingredient of antiseptic dettol).
• Thymol obtained from oil of thyme (a spice plant) has excellent non-toxic antiseptic properties.

• A dilute aqueous solution of phenol has antiseptic properties but it is found to be corrosive in nature. 
• Many chloro derivatives of phenol are more potent antiseptic and have less corrosive effects than phenol, if used in lower concentrations.

Thus, instead of phenol it’s chloro derivatives are used as antiseptics.

Chlorophyll ‘a’, Chlorophyll ‘b’, Xanthophyll and Carotene.

Borges feels that poetry needs to use language precisely. He opines that only precise words elicit the emotion. In order to prove his point, he quotes a line from Emily Dickinson, ‘This quiet dust was gentlemen and ladies’. He argues that though the idea is banal the poet is referring to a place which had been visited by men and women in ‘summer’. These people are now dead and the dust she refers to is the dust of death. Instead of saying ‘This quiet dust was gentlemen and ladies’ if the poet had used ‘men and women’, the poem would have failed as poetry. It would have sounded trivial.

The skeletal equation is: 

As₂O₃ + SnCl₂ + HCl ------->  SnCl₄ + As + H₂O 

Balancing arsenic and oxygen atoms by multiplying As by 2 and H₂O by 3 

As₂O₃ + SnCl₂ + HCl ---------> SnCl₄ + 2As +3 H₂O 

Multiplying HCl by 6 to balance H atoms 

As₂O₃ + SnCl₂ +6 HCl --------->  SnCl₄ + 2As +3 H₂O 

To balance chlorine atoms, multiply SnCl₂ and SnCl₄ both by 3. 

As₂O₃ +3SnCl₂ + 6HCl --------> 3SnCl₄ + 2As +3 H₂O

Mass of chlorophyll = 2.0 g 

Percentage of Mg = 2.68 g

Mass of Mg in 2.0 g of chlorophyll = 2.68 x 2.0/100 = 0.054 g 

6.022 X 10²³ atoms of magnesium = 24 g 

24 g of Mg contains = 6.022 X 10²³ atom 

0.054 g of Mg contains = 6.022 x 12.0/24 = 1.3 X 10²¹ atoms

The ventral root ganglion of the spinal cord contains cell bodies of the Motor neuron.

(a) Myopia (b) Hypermetropia

(a) Concave lens (b) Convex lens 

Eating heavy food slows down the brain activities.

Absorption is the process by which nutrients pass from the alimentary canal into the blood and lymph through its mucous membrane.

Pancreatic juice contains proenzymes trypsinogen, chymotrypsinogen and procarboxypeptidase and enzyme elastase.

Chymotrypsin and trypsin are the two proteases in the pancreatic juice. They enable simultaneous stimulation of all pancreatic proteases for a very rapid digestion of proteins.

The bombyx mori

1. Like her, peepal, palas, kusum, babul, etc. are used for feeding lac insects during the practice of lac culture. 

2. Natural lac is contaminated and hence it is washed and purified. This helps to obtain shellac in pure form.

Trachardia lacca

Orange spots indicate that eggs are about to hatch.

Yellow spots indicate shrinking of female lac insect.

The allied professions to poultry are processing of eggs and meat, marketing of poultry products, compounding and sale of poultry feed, poultry equipment, pharmaceuticals, feed additives, etc.

The areas having sufficient wild shrubs, cultivated crops of sunflower, mustard, safflower, chilly, cabbage, cucumber, legumes, etc. and fruit orchards of apple, mangoes, citrus, etc. are suitable for bee keeping.

1. Mushrooms are directly used as food.

2. They produce large, fleshy fruiting bodies which are edible. 

3. They are low calorie, sugar free, fat free, but rich in proteins, vitamins, minerals and amino acids. 

4. Hence, we include mushrooms in our diet.

The hen which is reared to obtain meat is called a broiler.

Correct answer is (a) bee glu

The hen which is reared to obtain eggs is called a layer.

1. Vitamins B and K are produced in the body. 

2. But some vitamins like C, D and E are not produced in the body. 

3. If our body does not get these vitamins in the required quantity, then the deficiency of these vitamins may result in various diseases. 

4. Therefore, vitamins are to be consumed through food or tablets or capsules.

Food is defined as solid or liquid substance, which is swallowed, digested and assimilated in the body, keeping us well.

Correct answer is (b) bacterial

The average density of population of Rajasthan is 200 persons per sq. m.