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Questions in chemistry

📝 Answered - 2. A pH scale is given below. Which of the following mixtures can produce a neutral solution? Neutral Acid → ↑ Base 3 4 5 6 7 8 9 10 11 P Q R S a. P and Q b. P and R c. R and S d. All of these 3. Rahul took a turmeric paper and tried to draw flowers on it with the help of cotton buds dipped in solutions P and Q. The flower drawn with solution Q turned red. Solutions P and Q could be respectively a. Lime water and lemon juice b. Vinegar and soap solution c. Common salt solution and baking soda d. Both (b) and (c)

📝 Answered - The equation $Mg ( s )+2 HCl ( aq )$--> $MgCl _2( aq ) H _2(g)$ is an example of which type of reaction? A. decomposition reaction B. triple replacement reaction C. single replacement reaction D. double replacement reaction

📝 Answered - Which of the following occurs in an ionic bond? A. Oppositely charged ions attract. B. Like-charged ions attract. C. Two atoms share two electrons. D. Two atoms share more than two electrons.

📝 Answered - Directions: In the following question, the Assertion (A) and Reason (R) have been put forward. Read the statements carefully and choose the correct alternative from the following: (a) Both assertion and reason are true, and reason is the correct explanation of assertion. (b) Both assertion and reason are true, but reason is not the correct explanation of assertion. (c) Assertion is true, but reason is false. (d) Assertion is false, but reason is true. Assertion (A): When sugar is poured in water, then the taste of water becomes sweet. Reason (R): Sugar dissolves completely in water giving its character.

📝 Answered - Hydrofluorocarbons (HFCS) affect the atmosphere by ... A. Depleting the ozone layer B. Increasing global temperatures C. Both A and B D. Neither A nor B

📝 Answered - Which type of reaction has the general formula of [tex]$A B+C D \rightarrow A D+C B$[/tex]? A. synthesis B. decomposition C. oxidation D. replacement

📝 Answered - What volume, in liters, of 4.0 M LiBr solution can be made using 100.0 g LiBr? [tex]LiBr : 86.44 g / mol[/tex]

📝 Answered - What is the molar mass of $H_3PO_4$? (Molar mass of $H = 1.0079 g/mol; P = 30.974 g/mol; O = 15.999 g/mol$) A. $72.98 g/mol$ B. $78.22 g/mol$ C. $88.24 g/mol$ D. $97.99 g/mol

📝 Answered - HFC-134a has replaced which of the following in all MVAC systems? A. HFC-777 B. CFC-12 C. HFC-143a D. HFC-123a

📝 Answered - What element is undergoing reduction (if any) in the following reaction? [tex]Zn(s)+2 AgNO_3(aq) \rightarrow Zn(NO_3)_2(aq)+2 Ag(s)[/tex] A. Zn B. Ag C. O D. N E. This is not an oxidation-reduction reaction.