Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
1.Assertion: Bauxite is the most important ore of Aluminium.
Reason: Carbon is used to reduce bauxite to aluminium
Answer. (a)
2.Assertion: Brass is an alloy of Zinc and Magnesium.
Reason: Alloys are homogenous mixture of two or more metals.
Answer. (d)
The statement of the Assertion is false but the Reason is true.
3.Assertion: Iron can be obtained from Fe2O3 by reduction with aluminium.
Reason: The process is known as thermite process.
Answer . (a)
both assertion and reason are right and it is the correct reason for assertion
4.Assertion: Elements Pt, Ag, noble gases, etc. occur in native state in nature.
Reason: Elements which are attacked by moisture, oxygen and CO2 of air occur in native state.
Answer
Assertion is true for given statement while reason is wrong.
5.Assertion: Reactivity Series is an arrangement of element based on their reactivity.
Reason: Reactivity Series is used to separate elements based on their reactivity.
Answer. a) both assertion and reason are correct and reason is correct explanation of assertion
6. Assertion :Metals like Na, K, Ca and Mg are never found in their free state in nature
Reason :Metals are very reactive elements, so it combines with other non-metals to complete its octet. Metals like Na, K, Ca and Mg are never found in their state in nature.
Answer. (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
7. Assertion: Nitrogen is a non-metal.
Reason: Nitrogen has 5 valence electrons.
Answer: b
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
8.Assertion: Al2O3, is an amphoteric oxide.
Reason: Al2O3 reacts with acid as well as base to form salt and water.
Answer: a
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
9.Assertion: Highly reactive metals are obtained by electrolytic reduction of their molten ore.
Reason: Highly reactive metals can be extracted by chemical reduction.
Answer: c
(c) Assertion is true but the Reason is false.
10.Assertion: Copper does not reacts with the H2SO4.
Reason: Copper is more reactive than hydrogen
Answer: c
Assertion is true but the Reason is false.
11.Assertion: Silver becomes black in colour when exposed to atmosphere.
Reason: Silver reacts with H^S gas to form Ag,S which is black in colour.
Answer: a
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
12. ASSERTION: Isotopes have same atomic masses.
REASON: Isotopes have same atomic number and have similar chemical properties.
Answer. (D)
If assertion is INCORRECT, but reason is CORRECT
13. ASSERTION: Metallic character decreases across a period.
REASON: Metals are electro-negative.
Answer. (C)
If assertion is CORRECT, but reason is INCORRECT
14. ASSERTION: Sodium bicarbonate is used in antacid medicines.
REASON: It is a mild based which neutralizes the acidity of gastric juice.
Answer.(a)
If both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.
15.ASSERTION: Ethylene is an unsaturated hydrocarbon.
REASON: Ethylene contains carbon-carbon triple covalent bond.
Answer. (c )
If assertion is CORRECT, but reason is INCORRECT
16. ASSERTION: Sodium and potassium is stored under kerosene.
REASON: Sodium (Na) and Potassium (K) belongs to group IA, so they are alkali metals.
Answer . (B)
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