Chemistry Past Questions And Answers
781
Electrovalent compounds are characterized by
- A. solubility in ethanol
- B. high molar mass
- C. high melting point
- D. strong oxidizing ability
782
If the PH of a compound is 3.2 that compound is _____
- A) Amphoteric
- B) A Salt
- C) An Acid
- D) A Base
783
In structural isomerism same atoms are linked to _______
- A) carbon atoms
- B) similar atoms
- C) different neighbouring atoms
- D) different functional groups
784
A compound with molecular formula CH2O2 is
- A. A Carbohydrate
- B. A Carboxylic acid
- C. An alkanol
- D. An ester
785
Which of the following contains co-ordinate covalent bond?
- A. HCI
- B. CH4
- C. NH4
- D. Na+CI
786
CH3COOC2H5(1) + H2O(1) ⇌ CH 3COOH (aq) + C 2H 5OH (aq)The purpose of H+ in the reaction above is to
- A) increase the yield of products
- B) maintain the solution at a constant PH
- C) increase the rate of the hydrolysis
- D) decrease the rate of the reverse reaction
787
The synthetic detergents are preferred to soap for laundry using hard water because?
- A. detergents are water soluble while soap is not
- B. the calcium salts of detergents are water soluble
- C. the magnesium salt of soap is soluble in hard water
- D. soap does not have a hydrocarbon terminal chain
788
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
- A. 16
- B. 17
- C. 18
- D. 19
789
Which of the following equimolar solutions has the highest conductivity?
- A. \(H_2SO{_4(aq)}\)
- B. \(NaOH{_(aq)}\)
- C. \(H_2CO{_3(aq)}\)
- D. \(CH_3COOH{_4(aq)}\)
790
A given mass of gas occupies 2dm3at 300k. At what temperature will its volume be doubled, keeping the pressure constant?
- A) 400k
- B) 480k
- C) 550k
- D) 600k