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- Question
Which sample of matter is a mixture?
Options- A. KBr (S)
- B. NaCl (L)
- C. K (S)
- D. NaCl (Aq)
- Correct Answer
- NaCl (Aq)
ExplanationMixtures are combination of two or more substances physically which can be separated in to the original.
Matter can be breakdown into two categories.
1) Pure substances
2) Mixtures
Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.
- 1. What molecule is indicated by the letter D?
Options- A. ATP
- B. Water
- C. Glucose
- D. Oxygen Discuss
- 2. The carbon tetrachloride molecule (CCl4) is
Options- A. a nonpolar molecule with polar bonds
- B. a nonpolar molecule with nonpolar bonds
- C. a polar molecule with polar bonds
- D. a polar molecule with nonploar bonds Discuss
- 3. Milk is an example of a
Options- A. Emulsion
- B. Solution
- C. Gel
- D. Suspension Discuss
- 4. Give the common name for the following compound CH32CH CH2 - Br
Options- A. Isobutyl bromide
- B. Methyl bromide
- C. Propyl bromide
- D. Butyl bromide Discuss
- 5. Which of the following elements is a metal?
Options- A. Se
- B. I
- C. Zn
- D. S Discuss
- 6. What element behaves most like magnesium?
Options- A. Sr
- B. S
- C. Si
- D. Sn Discuss
- 7. What element is used to disinfect swimming pools?
Options- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Sulphur Discuss
- 8. Through which conversion is energy released?
Options- A. CO2 and H2O to C6H12O6 and O2
- B. NADP+ to NADPH
- C. ADP to ATP
- D. ATP to ADP Discuss
- 9. Which bond has the greatest ionic character?
Options- A. H-F
- B. H-Cl
- C. H-N
- D. H-O Discuss
- 10. Bullet proof material is made up of which polymer?
Options- A. Poly carbonates
- B. Poly vinyl
- C. Poly amides
- D. Polychloride Discuss
Chemistry problems
Search Results
Correct Answer: Oxygen
Explanation:
Oxygen is the final electron acceptor of cellular respiration.
Correct Answer: a nonpolar molecule with polar bonds
Explanation:
The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar.
When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.
Correct Answer: Emulsion
Explanation:
Milk is an emulsion of oil in water (o/w).
Emulsion: A suspension of droplets of one liquid in another.
Constituents of milk :
The principal constituents of milk are water, fat, proteins, lactose (milk sugar) and minerals (salts). Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids (substances with fatlike properties), and gases.
Correct Answer: Isobutyl bromide
Correct Answer: Zn
Explanation:
In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.
Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.
Here Se - Selenium is an element but is not a metal, S - Sulphur is not a metal and I - Iodine is also not a metal.
Hence, Zn - Zinc is the only metal in the given options.
Correct Answer: Sr
Explanation:
We know that, elements in the same group of the periodic table have similar characteristics. Here magnesium and strontium are the same 2nd group elements and have same behavior.
Therefore, strontium behaves same as magnesium.
Correct Answer: Chlorine
Correct Answer: ATP to ADP
Correct Answer: H-F
Explanation:
Ionic character depends on the electronegativity difference between the bonding elements. The greatest the elctronegativity diffference the greatest the ionic character.
Here in the given options, H-F has has the greatest ionic character. The electronegativity of Hydrogen is 2.1 and that of Fluorine is 4. Now the electronegativity difference is 4 - 2.1 = 1.9.
Correct Answer: Poly carbonates
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