Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 7 - 13 of 144
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Question number: 7
» Chemistry » Structure of Atom
Question
Calculate the mass of 1 mole of NaCl. (Given atomic mass of Na-23, Cl- 35.5)
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 11.2 gms |
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| b. | 11.8 gms |
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| c. | 58.5 gms |
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| d. | 56 gms |
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Question number: 8
» Chemistry » Physical and Chemical Changes
Question
On adding ethanoic acid to NaHC0 3, what will happen?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | NO 2 gas is evolved |
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| b. | CO 2 gas is evolved |
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| c. | O 2 gas is evolved |
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| d. | SO 2 gas is evolved |
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Question number: 9
» Chemistry » Periodic Classification of Elements
Question
Who compared the properties of elements with notations of music and propounded ‘law of octaves’ for the classification of elements?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Newland |
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| b. | Mendeleef |
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| c. | Dobereiner |
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| d. | Lothal Mayer |
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Question number: 10
» Chemistry » Periodic Classification of Elements
Question
An element X forms and oxide X 2 O 3. In which group of Mendeleef s periodic table is this element located?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Group II |
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| b. | Group III |
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| c. | Group VIII |
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| d. | Group V |
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Question number: 11
» Chemistry » Physical and Chemical Changes
Question
On adding dilute HCl to granulated zinc placed in a test tube, the observation made is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | the surface of the metal turns shining |
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| b. | the reaction mixture turns milky. |
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| c. | a colorless and odourless gas evolves with bubbles. |
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| d. | odour of chlorine is observed. |
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Question number: 12
» Chemistry » Physical and Chemical Changes
Question
The latent heat of vaporization of water is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 3.34 × 10 5 |
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| b. | 22.5 × 10 5 |
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| c. | 2.2 × 10 5 |
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| d. | None of the above |
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Question number: 13
» Chemistry » Physical and Chemical Changes
Question
Evaporation of liquid occur at
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | all temperature |
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| b. | boiling point |
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| c. | fixed temperature lower than the boiling point |
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| d. | All of the above |
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