उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What is radioactivity?

1. AThe glow produced by any hot object
2. BThe release of heat and light when fuels burn in air
3. CThe release of radiation by unstable atomic nuclei
4. DThe flow of electrons through a metal wire

What does the law of conservation of mass state?

1. AMass is lost as heat in every reaction
2. BThe mass of products is always greater than the mass of reactants
3. CMass is neither created nor destroyed in a chemical reaction
4. DGases have no mass

What is the SI unit of energy?

1. AKelvin
2. BJoule
3. CNewton
4. DWatt

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AIt coats the stomach and stops all acid production
2. BIt turns the acid into a gas that is absorbed
3. CAn acid in it lowers the stomach pH further
4. DA weak base in it neutralises some of the acid

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AExothermic
2. BReversible only
3. CEndothermic
4. DNuclear

Sulfur has 16 electrons. In which period of the periodic table is it?

1. APeriod 6
2. BPeriod 16
3. CPeriod 3
4. DPeriod 2

Which coefficients balance the equation for cellular respiration, __C₆H₁₂O₆ + __O₂ → __CO₂ + __H₂O?

1. A1, 6, 6, 6
2. B1, 3, 6, 6
3. C1, 6, 6, 12
4. D2, 6, 12, 6

इनमें से कौन-सा दुर्बल अम्ल है?

1. Aनाइट्रिक अम्ल
2. Bऐसीटिक अम्ल (सिरके में)
3. Cसल्फ़्यूरिक अम्ल
4. Dहाइड्रोक्लोरिक अम्ल