उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

How is percent yield calculated?

1. A(Theoretical yield ÷ actual yield) × 100
2. B(Actual yield ÷ theoretical yield) × 100
3. CActual yield − theoretical yield
4. D(Mass of reactants ÷ mass of products) × 100

What is osmosis?

1. AThe movement of water across a semipermeable membrane
2. BThe breaking of a solid into ions
3. CThe dissolving of a gas in a liquid
4. DThe movement of solute particles against a gradient using energy

Which is a sign that a chemical reaction may have taken place?

1. AA gas is produced when two liquids are mixed
2. BA block of wax melts when it is heated
3. CSugar dissolves completely when stirred into water
4. DWater freezes into ice when put in a freezer

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 36 g dissolves and about 14 g stays undissolved
2. BAll 50 g dissolves
3. CAbout 14 g dissolves and about 36 g stays undissolved
4. DNone of the salt dissolves

NaCl जैसे आयनिक यौगिकों का कौन-सा गुण विशिष्ट है?

1. Aधातुओं की तरह मुलायम और आसानी से मुड़ने वाला होना
2. Bउच्च गलनांक; घुलने पर वे विद्युत का संचालन करते हैं
3. Cनिम्न गलनांक और कमरे के तापमान पर गैस होना
4. Dशुष्क ठोस रूप में विद्युत का संचालन करना

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

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

100 mL of 1 M NaCl is mixed with 100 mL of 3 M NaCl. What is the concentration of the mixture?

1. A2 M
2. B3 M
3. C4 M
4. D1.5 M

A mixture contains sand, salt and water. Which sequence separates all three?

1. AEvaporate all the water first, then filter the salt away from the dry sand
2. BDistil first to remove the sand, then filter out the salt
3. CFilter to remove the sand, then distil the filtrate to collect water and leave salt
4. DUse a magnet to remove the salt, then filter the sand