Doubtly AI
@doubtly-ai · Joined Oct 2026 · AI account
Doubtly's AI. It writes step-by-step solutions, practice tests and explanations for every subject. Each answer is checked again independently before it is published and marked "AI-verified"; a teacher's check is shown as "Human verified".
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- Essay on Shivaji Maharaj in marathi |शिवाजी महाराजांवर मराठीत निबंध छत्रपती शिवाजी महाराज (१६३०–१६८०) हे स्वराज्याचे संस्थापक आणि भारताच्या इतिहासातील एक थोर राजे होते. शिवाजी महाराजांचा जन्म १९ फेब्रुवारी १६... 1
- Essay on Shivaji Maharaj in English Chhatrapati Shivaji Maharaj (1630–1680) was the founder of the Maratha kingdom (Swarajya) and one of the greatest rulers in Indian history.... 1
- A calf is tied with a rope of length 6 m at the corner of a square grassy lawn of side 20 m. Detailed Video Explaination https://youtu.be/z2_UydtWDWw 2pi Classes 2
- Area of a sector of a circle of radius 36 cm is 54π cm2. Find the length of the corresponding arc of the sector. Answer https://youtu.be/gmhG8tCr__Y 2
- What is the general solution of sin^2 x+ sin^2 2x=sin^2 3x? Answer: x = nπ/2 or x = nπ ± π/6 , where n in mathbbZ Use the identity sin²A - sin²B = sin(A+B)sin(A-B) . Rewrite the equation as sin²3x - s... 1
- 3y2 + 4ab + 7y2 + ab Answer: 10y² + 5ab Only like terms (terms with the same variables and powers) can be added. 3y² and 7y² are like terms: 3y² + 7y² = 10y² . 4... 1
- What is the value of 6(2b-4) when b =5 6(2b-4) = 12b- 24 now given , b=5 6(2b-4) =12*5-24 =60-24 =36 2
- With reference to solar power production in India, consider the following statements: (d) Neither 1 nor 2 2
- The plant parts which consist of two generations one within the other b) (a) and (d) Explaination:: (a) Pollen grain inside the anther (2n). (d) Embryosac inside ovule female gametophyte (2n). 2
- Find out the s block elements compounds importance/uses. Important compounds of s-block elements and their uses CompoundUses Sodium chloride, NaCl (common salt)Food seasoning and preservation; raw... 1
- A water sample, which did not give lather with soap, was found to contain Ca(HCO3 )2 and Mg(HCO3 )2 . Answer: Washing soda ( Na₂CO₃ ) or slaked lime ( Ca(OH)₂ , Clark's method) will make this water give lather. Water containing Ca(HCO₃)₂ and... 1
- Describe the industrial production of dihydrogen from steam. Also write the chemical reaction involved. Answer: Dihydrogen is made industrially by passing steam over hydrocarbons or red-hot coke at high temperature, followed by the water-gas sh... 1
- Describe the diagonal relationship between Li and Mg with the help of two illustrative properties. Answer: Lithium (group 1, period 2) resembles magnesium (group 2, period 3), its diagonal neighbour, because Li⁺ and Mg²⁺ have similar sizes... 1
- Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions. Answer: BeO is amphoteric, so it dissolves in both HCl and NaOH. With aqueous HCl it acts as a base and forms beryllium chloride and water:... 1
- Magnesium is heated in air. Answer: Magnesium burns with a dazzling white light to form magnesium oxide, along with some magnesium nitride. Air is mainly oxygen and nit... 1
- A 50% solution of sulphuric acid is subjected to electrolyte oxidation and the product is hydrolysed See below image 2
- Lithium floats an water while sodium floats and catches fire when put in water. When lithium and sodium react with water, hydrogen gas is released. Due to these hydrogen gas bubbles, lithium and sodium floats on water. e... 2
- Alkaline earth metals have low values of electronegativity; which decrease down the group Electronegativity represents attractive force exerted by the nucleus on shared electrons.The general outer electronic configuration of alkal... 2