The shapes of water, ammonia, carbon (iv) oxide and methane are respectively
- A. linear, tetrahedral, angular and pyramidal
- B. angular, pyramidal, linear and tetrahedral
- C. pyramidal, linear, tetrahedral and angular
- D. tetrahedral, angular, pyramidal and linear
A cell shorthand notation can be written as A / A\(^+\) // B\(^{2+}\) /B. The double slash in the notation represents the
- A. electrolyte
- B. electrodes
- C. salt bridge
- D. solid - liquid interface
Consider the reaction: A + 2B\(_{(g)} \rightleftharpoons \) 2C + D\(_{(g)}\) (\(\Delta\)H = +ve)
What will be the effect of decrease in temperature on the reaction?
- A. Rate of backward reaction will increase
- B. The equilibrium constant will shift
- C. Rates of forward and backward reactions are not affected
- D. Rate of forward reaction will increase
The following are isoelectronic ions except
- A. Na\(^+\)
- B. Mg\(^{2+}\)
- C. Si\(^{2+}\)
- D. O\(^{2+}\)
The hybridization in the compound \(CH_3 – CH_2 – C \equiv H\) is
- A. sp\(^3\) and sp
- B. sp
- C. sp\(^2\)
- D. sp\(^3\) and sp\(^2\)
The electronic configuration of element Z is 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\). What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.
- A. Z\(_3\)(SO\(_4\))\(_2\)
- B. ZSO\(_4\)
- C. Z\(_2\) SO\(_4\)
- D. Z\(_2\)(SO\(_4\))\(_3\)
Which of the following could not be alkane?
- A. C\(_4\)H\(_{10}\)
- B. C\(_5\)H\(_{12}\)
- C. C\(_7\)H\(_{14}\)
- D. C\(_8\)H\(_{18}\)
The two ions responsible for hardness in water are
- A. Ca\(^{2+}\) and / or Mg\(^{2+}\)
- B. K\(^+\) and / or Mg\(^{2+}\)
- C. Ca\(^{2+}\) and / or Li\(^+\)
- D. Ca\(^{2+}\) and / or Na\(^+\)
What volume of 0.100M sodium trioxonitrate (V) solution contains 5g of solute.
[Na = 23, N = 14, O = 16]
- A. 1.7 litres
- B. 0.420 litres
- C. 0.588 litres
- D. 2.35 litres
Elements in the periodic table are arranged in the order of their
- A. atomic numbers
- B. metallic character
- C. mass number
- D. relative atomic mass
Which important nitrogen-containing compound is produced in Haber’s process?
- A. NH\(_3\)
- B. NO\(_2\)
- C. NO
- D. HNO\(_3\)
What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hours 30 mins, through molten magnesium chloride?
[1 faraday = 96500C, Mg = 24]
- A. 1.12g
- B. 4.48g
- C. 1.80g
- D. 2.00g
Which of the following gases contains the least number of atoms at s.t.p?
- A. 1 mole of butane
- B. 4 moles of chlorine
- C. 3 moles of ozone
- D. 7 moles of argon
The IUPAC nomenclature of the compound
H\(_3\)C – CH(CH\(_3\)) – CH(CH\(_3\)) – CH\(_2\) – CH\(_3\)
- A. 3,4- dimethylhexane
- B. 2,3- dimethyl pentane
- C. 2- ethyl hexane
- D. 2,3- dimethylhexane
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180. Find the molecular formula.
[H = 1, C = 12, O = 16]
- A. C\(_3\)H\(_6\)O\(_3\)
- B. C\(_6\)H\(_6\)O\(_3\)
- C. C\(_6\)H\(_{12}\)O\(_6\)
- D. CH\(_2\)O
In the reaction:
M + N โ P
ฮH = +Q kJ
Which of the following would increase the concentration of the product?
- A. Adding a suitable catalyst
- B. Increasing the concentration of P
- C. Increasing the temperature
- D. Decreasing the temperature
Sulphur exists in six forms in the solid state. This property is known as
- A. Isomerism
- B. Allotropy
- C. Isotopy
- D. Isomorphism
In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm\(^3\) of 1.25 molar tetraoxosulphate (vi) acid?
- A. 25cm\(^3\)
- B. 10cm\(^3\)
- C. 20cm\(^3\)
- D. 50cm\(^3\)
Which of the following is a physical change?
- A. Exposing white phosphorus to air
- B. Burning kerosene
- C. Dissolving calcium in water
- D. Freezing ice cream
Consider the equation below:
Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O.
The oxidation number of chromium changes from
- A. +5 to +3
- B. +6 to +3
- C. -2 to +3
- D. +7 to +3
Which of the following pairs cannot be represented with a chemical formula?
- A. air and bronze
- B. bronze and sodium chloride
- C. copper and sodium chloride
- D. caustic soda and washing soda