Which of the following changes is characteristic of an alpha-particle emission?

• A. the nucleus loses two protons and two neutrons
• B. a proton combines with an electron giving off heat
• C. the nucleus splits into two equal parts
• D. four neutrons are lost

In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

• A) Blue
• B) Red
• C) Orange
• D) Purple

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

If the rate law obtained for a given reaction is given as rate = K[X]\(^n\) [Y]\(^m\), what is the overall order of the reaction.

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  Options

  \(nm\)
• B)
  \(\frac{n}{m}\)
• C)
  \(n+m\)
• D)
  \(n-m\)

The formula of mercury (l) dioxonitrate (III) is

• A. HgNO₂
• B. Hg₂NO₂
• C. Hg₂(NO₂)₂
• D. Hg(NO₃)₂

Alkanes are used mainly?

• A. in the textile industry
• B. in the hydrogenation of oils
• C. as domestic and industrial fuels
• D. as fine chemicals

A primary amide is generally represented by the formula

• A) RCOOR
• B) RCONH 2
• C) RCONHR
• D) RCONR 2

One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

• A. 122
• B. 101
• C. 53
• D. 40

CuSO₄.5H₂O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by

• A. evaporation to dryness
• B. using chromatography
• C. precipitation
• D. crystallization

Calculate the mass of copper deposited when a current of 0.5 ampere was passed through a solution of copper(II) chloride for 45 minutes in an electrolytic cell. [Cu = 64, F = 96500C/mol]

• A) 0.300g
• B) 0.250g
• C) 0.2242g
• D) 0.448g