Chemistry

The molecular shape and bond angle of water are respectively

A. linear, 180° B. bent, 109.5° C. tetrahedral, 109.5° D. bent, 105° Correct Answer: Option D D. bent, 105°

6 years ago

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

A. 75,000 particles B. 35,000 particles C. 25,000 particles D. 50,000 particles Correct Answer: Option C C. 25,000 particles

6 years ago

The indicator most suitable for this reaction should have a pH equal to?

Na2CO3 + 2HCl → 2NaCl + H2O + CO2 A. 5 B. 7 C. 3 D. 9 Correct Answer: Option…

6 years ago

Which of the following properties increases from left to right along the period but decreases down the group in the Periodic Table?

i. Atomic Number ii. Ionization energy iii. Metallic character iv. Electron affinity A. ii and iii only B. ii and…

6 years ago

What technique is suitable for separating a binary solution of potassium chloride and potassium trioxochlorate (V)?

A. Fractional crystallization B. Fractional distillation C. Filtration D. Evaporation Correct Answer: Option A A. Fractional crystallization

6 years ago

Which of the following does not support the fact that air is a mixture?

A. the constituents of air are in a fixed proportion by mass B. it cannot be represented with a chemical…

6 years ago

Which of the following statements about catalyst is false?

A. biological catalysts are called enzymes B. catalyst do not appear in the balanced equation C. catalyst reduce the activation…

6 years ago

If acidified Potassium Dichromate(VI) (K2Cr2O7) acts as oxidizing agent, color changes from?

A. yellow to green B. orange to green C. yellow to red D. orange to red Correct Answer: Option B…

6 years ago

Consider the reaction A(s) + 2B(g) → 2C(aq) + D(g). What will be the effect of a decrease in pressure on the reaction?

A. the equilibrium will shift B. rate of forward reaction will increase C. rate of backward reaction will increase D.…

6 years ago