In the reaction NH3 + H+ ā NH4+, the bond formed results from?
- A. an electron transferred from NH3 + H+
- B. an electron pair donated by NH3
- C. an electron pair equally shared
- D. an electron pair donated by H+
- E. an electron tarnsferred from H+ to NH3
Which of the following statements is incorrect?
- A. Calcium reacts with water to form calcium
- B. Magnesium reacts very slowly with water but faster with warm water
- C. Iron will not react with water in the absence of air
- D. Sodium reacts with water
- E. Copper reacts with steam
Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as?
- A. deliquescence
- B. hygroscopy
- C. oxidation
- D. efforescence
- E. sublimation
The product formed at the the cathode during the electrolysis of sodium chloride solution with carbon electrodes is?
- A. sodium
- B. chlorine
- C. hydrogen
- D. sodium hydroxide
- E. oxygen
Which of the following types of reactions takes place between C2H6 and the halogens?
- A. Substitution
- B. Polymerization
- C. Addition
- D. Saponification
- E. Oxidation
Cotton is almost pure?
- A. starch
- B. protein
- C. animal fibre
- D. celluose
- E. mineral fibre
Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is?
- A. calcium
- B. calcium oxide
- C. calcium carbide
- D. sodium peroxide
- E. sodium sulphate
An amphoteric oxide is an?
- A. amorphous oxide of a metal
- B. amorphous oxide of a non-mental
- C. oxide that is insoluble in water
- D. oxide that behaves both as a base as well as an acid
- E. oxide that loses its oxygen on sublimation
Which of the following statements is correct during the electrolysis of a caustic soda solution using platinum electrodes?
- A. Oxygen gas is given off at the cathode
- B. Hydrogen gas is given of at the anode
- C. Sodium metals is deposited at the anode
- D. Sodium metal is deposited at the cathode
- E. AAlkalinity at the cathode increases
An acid is said to be weak if?
- A. its ions are so completely dissociated that they easily drift apart
- B. the acid is not corrosive
- C. the acid has low specific gravity
- D. its ions move very slowly when in solution
- E. its ions are incompletely dissociated
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
- A. One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
- B. Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
- C. One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water
- D. One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water
- E. One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
- A. 1s2 2s22p6 3s2
- B. 1s2 2s22p6 3s2 3p1s2 2s22p6 3s1
- C. 1s2 2s22p6 3s1
- D. 1s2 2s22p6 3sĀ°
- E. 1s2 2s22p6 4s1
A polymerization reaction is one in which?
- A. small molecules form giant molecules
- B. atoms form molecules
- C. giant molecules form small molecules
- D. molecules form volatile compounds
- E. a molecule rearranges itself
Allotropes are elements having?
- A. different physical but the same chemical properties
- B. different chemical but the same physical properties
- C. the same chemical and physical properties
- D. different atomic structure
- E. the same position in the periodic table
Which of the following can have an isomer?
- A. C2H4
- B. C4H10
- C. C3H8
- D. C2H6
- E. C6H6
In the preparation of ammonia, which of the following is used as the drying agent?
- A. CaO
- B. CaCI2
- C. Conc. H2SO4
- D. P2O5
- E. H3PO4
Which of the following processes takes place during electrolysis?
- A. Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
- B. Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
- C. Positive ions are discharged at the anode by losing sufficient electrons to become neutral
- D. Negative ions are discharge at the anode by losing sufficient electrons to become neutral
- E. Nothing happens
The brown coloration in nitric acid prepared in the laboratory can be removed by?
- A. heating the acid
- B. bubbling air through the acid
- C. cooling the acid
- D. adding a decolorizing agent
- E. adding a base
In the reaction
C + 2HNO3 ā CO2 + NO2 + NO + H2O nitric acid is acting as?
- A. a reducing agent
- B. a nitrating agent
- C. an oxidizing agent
- D. a catalytic agent
- E. a neutralizing agent
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
- A. a drying agent
- B. an oxidizing agent
- C. a dehydrated agent
- D. a reducing agent
- E. a hydrolysing agent
Which of the following statements is NOT true of electrovalent compounds?
- A. They are solids
- B. They do not vaporized easily
- C. They usually dissolve in water
- D. The elements forming the compounds normally have their valency electrons in a shared state
- E. They conduct electricity