Chemistry [NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension]: Questions 7 - 12 of 143
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Question 7
Question MCQ▾
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 | |
b. | 56 gms | |
c. | 11.8 gms | |
d. | 58.5 gms |
Question 8
Question MCQ▾
On adding ethanoic acid to NaHC03 , what will happen?
Choices
Choice (4) | Response | |
---|---|---|
a. | CO2 gas is evolved | |
b. | NO2 gas is evolved | |
c. | SO2 gas is evolved | |
d. | O2 gas is evolved |
Question 9
Question MCQ▾
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. | Dobereiner | |
b. | Newland | |
c. | Mendeleef | |
d. | Lothal Mayer |
Question 10
Question MCQ▾
An element X forms and oxide X2 O3 . In which group of Mendeleef s periodic table is this element located?
Choices
Choice (4) | Response | |
---|---|---|
a. | Group III | |
b. | Group V | |
c. | Group VIII | |
d. | Group II |
Question 11
Question MCQ▾
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 | |
b. | a colorless and odourless gas evolves with bubbles. | |
c. | odour of chlorine is observed. | |
d. | the reaction mixture turns milky. |
Question 12
Question MCQ▾
The latent heat of vaporization of water is
Choices
Choice (4) | Response | |
---|---|---|
a. | 22.5 × 105 | |
b. | 3.34 × 105 | |
c. | 2.2 × 105 | |
d. | None of the above |