myclass24
myclass24your class. your pace.
Q&A BANK

every question.
answered.

1,666 answers across CBSE, ICSE, and State boards — Class 1 to 12, every subject.

CBSEICSEState
SUBJECT
CLASS

Filtered results

1,666 TOTAL
ScienceClass 10CBSE

Describe the reactivity series of metals. Why is it important in understanding the displacement reactions?

The reactivity series is a list of metals arranged in the order of their decreasing reactivity. Metals at the top of the series are more reactive than those at the bottom. It is important because it helps predict whether a metal will displace another metal from its salt solution. A more reactive metal can displace a less reactive metal from its compound.

ScienceClass 10CBSE

Explain the key physical differences between metals and non-metals, providing at least three distinct properties for each.

Metals are generally lustrous, malleable, ductile, good conductors of heat and electricity, and solid at room temperature (except mercury). Non-metals are typically dull, brittle, non-ductile, poor conductors of heat and electricity (except graphite), and can exist as solids, liquids, or gases at room temperature.

ScienceClass 10CBSE

List three uses of non-metals in everyday life and explain their significance.

Oxygen: Essential for respiration in living organisms and combustion processes. Without oxygen, life as we know it would not exist, and many industrial processes like burning fuels would be impossible.Nitrogen: Used in fertilizers (e.g., urea, ammonia) for plant growth, and as an inert atmosphere in packaging food items to prevent spoilage. It is crucial for agriculture and food preservation.Chlorine: Used as a disinfectant for water purification (killing harmful bacteria) and in the production of PVC and bleaching agents. It plays a vital role in public health and various chemical industries.

ScienceClass 10CBSE

Why do ionic compounds have high melting and boiling points?

Ionic compounds are formed by strong electrostatic forces of attraction between oppositely charged ions. These forces are very strong and extend throughout the entire crystal lattice. A significant amount of energy is required to overcome these strong inter-ionic forces and break down the crystal structure, allowing the ions to move freely (melt) or separate completely (boil). Therefore, ionic compounds typically have high melting and boiling points.

ScienceClass 10CBSE

Describe the method of froth flotation used for concentrating sulphide ores.

Froth flotation is a metallurgical process used for concentrating sulphide ores. The finely powdered ore is mixed with water, a frothing agent (like pine oil), and a collector (like potassium ethyl xanthate). Air is then blown into the mixture through a rotating paddle. The frothing agent creates a stable froth, and the collector selectively adheres to the sulphide ore particles, making them water-repellent (hydrophobic) and oil-attracting.These oil-coated ore particles become lighter and rise with the froth to the surface, which is then skimmed off. The gangue (impurities) particles, being hydrophilic, settle down at the bottom.

ScienceClass 10CBSE

Explain the difference between roasting and calcination in the context of metal extraction. When is each process used?

Both roasting and calcination are processes used to convert metal ores into their oxides before reduction.Roasting: This process involves heating a sulphide ore strongly in the presence of excess air. The sulphide ore is converted into its metal oxide and sulphur dioxide gas is released. It is used for sulphide ores (e.g., 2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g)).Calcination: This process involves heating a carbonate ore or hydrated oxide ore strongly in a limited supply of air or in the absence of air. The carbonate ore decomposes to form its metal oxide and carbon dioxide gas. It is used for carbonate ores (e.g., ZnCO3(s) → ZnO(s) + CO2(g)) and hydrated oxides.

ScienceClass 10CBSE

Describe the electrolytic refining of copper. Include a labelled diagram.

Electrolytic refining is the most widely used method for refining impure metals like copper. In this process, the impure metal is made the anode, and a thin strip of pure metal is made the cathode. An aqueous solution of a salt of the metal (e.g., acidified copper sulphate for copper) is used as the electrolyte. When an electric current is passed:At the anode (impure copper), the impure metal oxidizes, and metal ions (e.g., Cu2+) dissolve into the electrolyte. More reactive impurities also dissolve, while less reactive impurities settle down as 'anode mud'.At the cathode (pure copper), the metal ions from the electrolyte gain electrons and deposit as pure metal.The overall effect is the transfer of pure metal from the anode to the cathode.

ScienceClass 10CBSE

What is galvanization? How does it protect iron from rusting?

Galvanization is the process of coating iron or steel with a thin layer of zinc. It protects iron from rusting in two main ways: Barrier Protection: The zinc layer acts as a physical barrier, preventing the iron from coming into contact with oxygen and moisture. Sacrificial Protection: Zinc is more reactive than iron. If the zinc coating is scratched, the zinc will corrode preferentially (sacrifice itself) to protect the underlying iron from rusting, as it will lose electrons more readily than iron.

ScienceClass 10CBSE

Give two chemical properties that distinguish metals from non-metals, and provide an example for each.

1. Reaction with Oxygen: Metals generally react with oxygen to form basic oxides (e.g., 2Mg(s) + O2(g) → 2MgO(s), where MgO is basic). Non-metals react with oxygen to form acidic or neutral oxides (e.g., C(s) + O2(g) → CO2(g), where CO2 is acidic).2. Reaction with Acids: Metals above hydrogen in the reactivity series react with dilute acids to produce hydrogen gas (e.g., Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)). Non-metals generally do not react with dilute acids to produce hydrogen gas.

GeneralClass 10CBSE

How can I stop procrastinating and concentrate on my study?

Eliminate the decision to check your phone remove it physically from your study space Use the Pomodoro Technique as your study rhythm 25 minutes focused, 5 minutes break Respect your ultradian rhythms the brain naturally peaks and troughs every 90 minutes, so build genuine breaks rather than forcing through diminishing returns Use implementation intentions: 'I will study Chapter 3 at 5pm, at my desk, for 25 minutes' Start with the topic you find hardest when your energy is highest Use habit stacking to anchor study to an existing habit in your daily routine.

GeneralClass 10CBSE

How do I stop procrastinating severely it's impacting my daily life?

When procrastination is severely impacting daily life, productivity tactics are insufficient on their own. First, rule out underlying conditions: ADHD, depression, and anxiety all impair task initiation neurologically, not just psychologically. See a GP or psychologist for an assessment. Second, address your physiological baseline: sleep, nutrition, and movement directly affect dopamine and the brain's capacity to initiate action. Third, reduce the emotional charge of tasks rather than fighting the procrastination itself journal what specifically triggers avoidance. If you have been struggling consistently for weeks or months, professional support is the right next step.

GeneralClass 10CBSE

How can I stop procrastinating on my homework assignments?

Set a false deadline 2 days before the real one and tell someone about it Start with the easiest question a completion signal reduces anxiety and builds momentum Use the study-then-reward structure, never reward-then-study Remove your phone physically from your study space use Forest or Cold Turkey to block distractions Use the Pomodoro Technique (25 min work, 5 min break) so sessions feel finite and manageable Study your hardest subject when your energy is highest, not last when you are depleted.

GeneralClass 10CBSE

What is the no. 1 best way to stop procrastinating and do stuff?

Design your environment and schedule so that starting your most important task requires the least possible decision-making and effort. Decide the night before what you will do, when, and where. Have everything ready. Sit down at the same time in the same place. Start with two minutes. Do not wait to feel motivated motivation is a result of action, not a prerequisite for it. Consistency of condition beats intensity of willpower every time.

GeneralClass 10CBSE

How to Stop Procrastinating by Using The 2-Minute Rule?

The 2-Minute Rule works on two levels. First: if a task takes less than 2 minutes, do it immediately don't add it to a list. Second, for larger tasks: commit to starting for only 2 minutes. You are not committing to finishing just beginning. This exploits the Zeigarnik Effect: the brain becomes preoccupied with incomplete tasks and generates momentum to resolve them. Once you start, continuing becomes the path of least resistance. The rule is a legal trick to bypass the initiation barrier.

GeneralClass 10CBSE

How can I stop procrastinating effectively?

Combine three levels of change: (1) Structural time-block your calendar, design your environment, reduce decisions (2) Psychological identify and name the specific emotion the task triggers, then reduce its charge by shrinking the task (3) Identity shift how you see yourself so your default behaviour aligns with your goals. Effectiveness comes from addressing all three, not just applying surface-level productivity tactics.

GeneralClass 10CBSE

How to stop procrastinating on my aspirations in life?

Aspirations fail most often because of vagueness, not laziness. 'I want to be successful' gives your brain nothing to act on. Define exactly what success looks like, identify the single next physical action, and schedule it. Reconnect with your why visually and emotionally write down how your life looks specifically different in one year if you act versus if you don't. Read this every morning. Review your aspirations weekly to adjust and recalibrate as reality shifts.

GeneralClass 10CBSE

How do you stop procrastinating even when the little tricks like starting small don't work?

When surface tactics fail, the root cause has not been identified. Look deeper: (1) Fear of completion or being judged finishing the thing is what threatens you, not starting it (2) Perfectionism masking as high standards practice 'done is better than perfect' in low-stakes situations (3) Depression or anhedonia if you've lost enjoyment in things you used to like, seek professional support (4) Novelty deprivation a flat, monotonous environment depletes dopamine; deliberately introduce new environments or approaches.

GeneralClass 10CBSE

How can I stop procrastinating and actually do my tasks right away when needed?

Use implementation intentions combined with environmental design. Decide in advance: when this trigger occurs, I will do this action. Example: 'When I sit at my desk at 9am, I will immediately open my priority task not email.' Remove competing stimuli from your environment. Reduce the number of steps between you and starting to the absolute minimum. Pre-load your workspace the night before so starting is the default behaviour when you arrive.

GeneralClass 10CBSE

What are some unique methods to stop procrastination and time-wasting?

(1) Temptation bundling only allow yourself to do something enjoyable (podcast, favourite coffee) while doing the task you avoid (2) Pre-commitment devices put money at stake for failing (Beeminder, commitment contracts) (3) 'Ulysses contracts' make decisions in advance that bind your future self, like deleting social media apps from your phone every morning (4) Novelty injection change your environment, tools, or approach to reactivate the dopamine response when routine has gone flat.

GeneralClass 10CBSE

How do I stop procrastinating in order to get a better version of myself?

Start with identity, not behaviour. The most durable change comes from shifting how you see yourself, not just what you do. Every time you do the thing you said you would even a tiny version you cast a vote for the person you want to become. Accumulate enough votes and the identity becomes self-sustaining. Design your environment to make the desired behaviours automatic rather than effortful. Progress compounds.

STILL STUCK?

Get a tutor for just your question.

One-on-one help, verified tutors. Matched within 24 hours.

Get Started →