उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What does the law of conservation of mass state?

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

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BA drawing of how the atoms are bonded
3. CThe simplest whole-number ratio of atoms in a compound
4. DThe actual number of each atom in one molecule

उत्प्रेरक क्या करता है?

1. Aअभिक्रिया को धीमा करता है और खर्च हो जाता है
2. Bअभिक्रिया के लिए अभिकारक उपलब्ध कराता है
3. Cबिना खर्च हुए अभिक्रिया को तेज़ करता है
4. Dअभिक्रिया के उत्पाद बदल देता है

अभिक्रिया 2Mg + O₂ → 2MgO में कौन-सा पदार्थ ऑक्सीकृत होता है?

1. Aऑक्सीजन, क्योंकि वह इलेक्ट्रॉन खोती है
2. Bमैग्नीशियम, क्योंकि वह इलेक्ट्रॉन ग्रहण करता है
3. Cकिसी भी पदार्थ का आवेश नहीं बदलता
4. Dमैग्नीशियम, क्योंकि वह इलेक्ट्रॉन खोता है

What charge do group 16 elements such as oxygen and sulfur usually have as ions?

1. A1−
2. B6+
3. C2+
4. D2−

कौन-से गुणांक समीकरण __H₂ + __O₂ → __H₂O को संतुलित करते हैं?

1. A2, 2, 2
2. B1, 2, 1
3. C2, 1, 2
4. D1, 1, 1

How many millilitres of 0.2 M NaOH are needed to neutralise 25 mL of 0.1 M HCl?

1. A25 mL
2. B50 mL
3. C5 mL
4. D12.5 mL

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. AThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
2. BCellulose is really made of amino acids, not glucose, so stomach acid cannot break it
3. CCellulose dissolves in water, so it is lost from the gut
4. DStarch contains nitrogen, which makes it easier to digest