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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- 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
- Collect the information of preparation of dihydrogen and make a chart Chart: methods of preparing dihydrogen ( H₂ ) MethodReaction Laboratory: zinc granules with dilute acid Zn + 2HCl → ZnCl₂ + H₂ Laboratory: z... 1
- Write short notes A. Useful and harmful bacteria. Bacteria are both useful and harmful to humans. Useful bacteria Dairy: Lactobacillus converts milk into curd; bacteria are also used for che... 1
- What are the salient features of monera? Salient features of Kingdom Monera: Size: The organisms included in this kingdom are microscopic, unicellular and prokaryotic. Occurrence: T... 2
- Paramoecium : Ciliated Protist Plasmodium : a. Amoeboid protozoan b. Ciliophora c. Flagellate protozoan d. Sporozoan (d) Sporozoan 2
- Causative agent of red tide is _____________. a. Dinoflagellate b. Euglenoid c. Chrysophyte d. Lichen (A) Dinoflagellate 2
- Which of the following shows single stranded RNA and lacks protein coat? a. Bacteriophage b. Plant virus c. Viroid d. Animal virus option (c) Viroid 2
- Make herbarium under the guidance of your teacher You are expected to perform the given activity by themselves under the guidance of their teacher. A tutorial Video :: Courtesy :: ScienceTac... 2
- A group of students found two cockroaches in the classroom. They had a debate whether they are alive or dead. (c) Irritability 2
- A particular plant is strictly seasonal plant. Which one of the following is best suited if it is to be studied in the laboratory (a) Herbarium 2
- Which is not a property of living being? a. Metabolism b. Decay c. Growth d. Reproduction correct option is b. Decay 2
- How the atomic size vary in a group and across a period? Explain with suitable example. Answer: Atomic size increases down a group and decreases from left to right across a period. Down a group: each new element has one more she... 1
- Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period? Variation of ionization energy down the group: On moving down the group, the ionization enthalpy decreases. This is because the electron is... 2
- Write a e-mail, addressed to the class teachers and informing class teachers of a school about their Sample e-mail informing class teachers about the meeting on dress code From: discipline@abcschool.edu.in To: classteachers@abcschool.edu.in... 1
- Write a e-mail, addressed to the principals of different schools located in the district/zone and informing the students Sample e-mail inviting schools to a three-day tree plantation campaign From: greencampaign.district@gmail.com To: principals.zone2@gmail.com... 1
- Write a e-mail instructing the residents of a colony to maintain cleanliness in the park in their neighbourhood. Sample e-mail requesting residents to keep the neighbourhood park clean From: secretary.rwa.greenpark@gmail.com To: seniorcitizens.greenpark... 1
- Write an e-mail, addressing teachers in-charge of different classes that will participate in the function. Sample e-mail announcing auditions for the dramatics competition From: culturalsecretary@abcschool.edu.in To: classteachers@abcschool.edu.in... 1