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Question 1

Assertion: The value of current in ammeter is same independent of its position in the series electric circuit. Reasoning: In a series combination of resistors current is same in every part of the circuit

Question

(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 ...

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Class 10 science 2 years 1 Answer 571 views Enlightened 0

Question 2

Assertion (A) : In a reaction of copper with oxygen, copper serves as a reducing agent. Reason (R) : The substance which gains oxygen in a chemical reaction acts as a reducing agent

Question

(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 ...

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Class 10 science 2 years 1 Answer 569 views Enlightened 0

Question 3

You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver? When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion

Question

(i).Chemically rust is (a).only ferric oxide (b).hydrated ferric oxide (c).hydrated ferrous oxide (ii).Rusting of iron involves a chemical reaction which is a combination of: (a) Reduction as well as combination reactions (b) Oxidation as well as combination reactions (c) Oxidation as well ...

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Class 10 science 2 years 1 Answer 463 views Enlightened 1

Question 4

. Assertion : In the following chemical equation, CuO(s) + Zn(s)→ZnO(s) + Cu(s) Zinc is getting oxidised and copper oxide is getting reduced. Reason : The process in which oxygen is added to a substance is called oxidation whereas the process in which oxygen is removed from a substance is called reduction.

Question

(a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) ...

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Class 10 science 2 years 1 Answer 443 views Enlightened 0

Question 5

ASSERTION: Rusting of iron is a chemical change. REASON: The chemical properties of hydrated iron oxide are different from iron and oxygen.

Question

(a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) ...

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Class 10 science 2 years 1 Answer 398 views Enlightened 0

Question 6

. Assertion: Rusting of iron metal is the most common form of corrosion. Reason: The effect of rusting of iron can be reversed if they are left open in sunlight.

Question

(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. · (b) Both Assertion and Reason are true but Reason is not the correct -explanation of Assertion. (c) Assertion is true but Reason is false.(d) ...

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Class 10 science 2 years 1 Answer 395 views Enlightened 0

Question 7

Q.34

Question

Raina while doing certain reactions observed that heating of substance ‘X’ with vinegar like smell with a substance ‘Y’ (which is used as an industrial solvent) in presence of conc. Sulphuric acid on a water bath gives a sweet-smelling liquid ...

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CBSE Sample Paper 9 months 1 Answer 384 views Tech Professional -1

Question 8

Assertion (A): Pure water is neither acidic nor basic. Reason (R): The pH of a solution is inversely proportional to the concentration of hydrogen ions in it

Question

(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. · (b) Both Assertion and Reason are true but Reason is not the correct -explanation of Assertion. (c) Assertion is true but Reason is false.(d) ...

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Class 10 science 2 years 1 Answer 379 views Enlightened 0

Question 9

Assertion: 34.12345 is a terminating decimal fraction Reason: Denominator of 34.12345, when expressed in the form q p , q ! 0, is of the form 2 5 m n , where m and n are nonnegative integers.

Question

(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 ...

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Class 10 Maths 2 years 1 Answer 349 views Enlightened 1

Question 10

Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas. Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as precipitation reaction.

Question

(a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) ...

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Class 10 science 2 years 1 Answer 320 views Enlightened 0

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