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Subject: Science, asked 2 hours, 39 minutes ago

differentiate between enrichment of ore and refining .

Subject: Science, asked 3 hours, 57 minutes ago

plz answer fast

Subject: Science, asked 3 hours, 58 minutes ago

plz state the correct answer fast

Subject: Science, asked 3 hours, 59 minutes ago

plz answer fast

Subject: Science, asked 18 hours, 49 minutes ago

 
Write the complete balanced chemical equation for the given reactions.
(a) 2 Fe(s) + H2O(g) give rise to
(b) 2 Ca(s) + H2O(1) give rise to
(c) Cu2O + Cu2S (In presence of heat) give rise to
(d) Fe2O3(s) + Al(s) give rise to
 
 

Subject: Science, asked 18 hours, 53 minutes ago

What will be the value of current and resistance in each case if an electric heater
consumes energy at a rate of 1000 W when heating is at the maximum rate and 500 W
when the heating is at the minimum and the voltage is 220 V?

Subject: Science, asked 19 hours, 4 minutes ago

Ronit uses a lens of focal length +40 cm and his brother Shobhit uses a lens of focal length -40 cm. What is the nature of the lens and its power used by each of them?

Subject: Science, asked 19 hours, 5 minutes ago

 
Identify the oxidizing and reducing agent in the given reactions.
(a) MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
(b) 2H2S + SO2→ 3S + 2H2O
(c) Fe2O3 + 2Al → 2Fe + Al2O3
 
 

Subject: Science, asked 19 hours, 11 minutes ago

The potential difference between the terminals of an electric toaster is 30 V when it draws a current of 2 A from the source. What current will the toaster draw if the potential difference is increased to 60 V?

Subject: Science, asked 19 hours, 22 minutes ago

State whether the following statements are true or false. 
(a) Refractive index is the ratio of speed of light in medium to the speed of lignt in vaccum.
(b) Hydrogen ions exist in a combined state in water as hydronium ions (H3O+).
(c) Digestive system consists of the alimentary canal and digestive glands.
(d) The twinkling of a star is due to atmospheric refraction of starlight.
(e) Decomposition of lead nitrate is detected by the emission of green fumes of nitrogen
dioxide.

Subject: Science, asked 19 hours, 32 minutes ago

What is meant by synapse?

Subject: Science, asked 19 hours, 43 minutes ago

Assertion: On addition of sodium bicarbonate to acid, gas bubbles are observed.
Reason: Carbon dioxide is evolved in the reaction.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.

Subject: Science, asked 21 hours, 31 minutes ago

Ronit uses a lens of focal length +40 cm and his brother Shobhit uses a lens of focal length −40 cm. What is the nature of the lens and its power used by each of them?

Subject: Science, asked 21 hours, 32 minutes ago

) What will be the value of current and resistance in each case if an electric heater consumes energy at a rate of 1000 W when heating is at the maximum rate and 500 W when the heating is at the minimum and the voltage is 220 V?

Subject: Science, asked 21 hours, 33 minutes ago

The potential difference between the terminals of an electric toaster is 30 V when it draws a current of 2 A from the source. What current will the toaster draw if the potential difference is increased to 60 V?

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