उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

According to the Arrhenius definition, what does an acid produce in water?

1. AHydrogen ions (H⁺)
2. BSodium ions (Na⁺)
3. CHydroxide ions (OH⁻)
4. DOxide ions (O²⁻)

पानी को अक्सर सार्वभौमिक विलायक क्यों कहा जाता है?

1. Aवह पृथ्वी पर पाया जाने वाला एकमात्र द्रव है
2. Bवह अन्य सामान्य द्रवों की तुलना में अधिक पदार्थों को घोलता है
3. Cउसके अणु में कहीं भी आंशिक आवेश नहीं होते, इसलिए वह सबके साथ मिल जाता है
4. Dवह हर पदार्थ को पूरी तरह घोल देता है

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe rate decreases
2. BThe rate stays the same
3. CThe rate increases
4. DThe reaction stops

AgNO₃ + NaCl → AgCl + NaNO₃ किस प्रकार की अभिक्रिया है?

1. Aएकल विस्थापन
2. Bद्विविस्थापन
3. Cवियोजन
4. Dदहन

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. AHydrolysis (splitting with water)
2. BCombustion
3. CNeutralisation
4. DCondensation (dehydration synthesis)

Why does keeping food in a refrigerator slow down spoilage?

1. ACold air contains no oxygen
2. BLower temperatures slow down chemical and microbial reactions
3. CLower temperatures raise the activation energy of every reaction
4. DCold temperatures add preservatives to the food

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AMore gas is produced by the crisps at altitude
2. BThe gas inside the bag is heated strongly by the mountain sunlight
3. CThe bag becomes thinner and weaker at altitude
4. DThe outside air pressure is lower, so the gas inside expands

A compound is 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass (C = 12, H = 1, O = 16). What is its empirical formula?

1. ACH₂O
2. BC₂HO
3. CCHO
4. DCH₄O