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. Read the following and answer any four questions from (i) to (v) In the below experiment, when an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.

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(i) The equation Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O. The values of x and y are (a) 3 and 5 (b) (b) 8 and 6 (c) (c) 4 and 2 (d) (d) 7 and 1 (ii) What happens ...

Class 10 science 3 years 0 Answers 8 views Enlightened 0

. Following is given a diagram showing an experimental set-up:

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The given set-up is used to carry out: a. Distillation of water b. Purification of water c. Electrolysis of water d. Hydrolysis

Class 10 science 3 years 0 Answers 7 views Enlightened 0

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

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a. Make the ribbon surface shinier b. Remove the layer of magnesium oxide from the ribbon surface c. Remove the layer of magnesium carbonate from the ribbon surface d. Remove the moisture from the ribbon surface

Class 10 science 3 years 0 Answers 6 views Enlightened 0

Assertion: In a simple battery circuit the point of lowest potential is positive terminal of the battery. Reasoning: The current flows towards the lower potential that is from positive to negative

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(a)Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion is ...

Class 10 science 3 years 0 Answers 16 views Enlightened 0

.Assertion: The current flowing through each resistor is the same when connected in series. Reason: The voltage drop across each resistor remains the same when connected in parallel.

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Class 10 science 3 years 0 Answers 19 views Enlightened 0

.Assertion (A) : Decomposition of vegetable matter into compost is an example of exothermic reactions. Reason (R) : Exothermic reaction are those reactions in which heat is evolved

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Assertion: Pupil is black in colour. Reason: Pupil is black in colour as no light is reflected in it.

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Class 10 science 3 years 0 Answers 26 views Enlightened 0

.A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the Figures given below. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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Class 10 science 3 years 0 Answers 5 views Enlightened 0

.A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the Figures given below. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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Class 10 science 3 years 0 Answers 14 views Enlightened 0

.A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the Figures given below. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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Class 10 science 3 years 0 Answers 5 views Enlightened 0

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