The existance of two or more forms of the same element in the same physical state is known as
2
When an atom gains an electron, it becomes
3
The alkali metals exhibit similar chemical properties because
4
What is the likely formula of compound formed between element M in group two and element X in group seven?
5
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
6
What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]
7
A solution of pH 7 is
8
Which of the following equations represents a neutralization reaction?
9
Amphoteric oxides are oxides which
10
The following acids are monobasic except
11
An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as
12
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
13
Which of the following statements is not correct about electrolysis?
14
Which of the following is not correct about a catalyst? It
15
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
16
What does X represent in the following equation? H 2(g) + 1/2O 2(g) → H 2 O (l) ; ∆H = xKJ.
17
If the third member of a homologous series is C 3 H 8 , the fifth member will be
18
Which of the following exhibits resonance?
19
On exposing palm wine to air for some days, it becomes sour owing to the conversion of
20
When acidified KMnO 4 solution is decolorised by ethene, the gas acts as
21
What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?
22
When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of
23
Which of the following is a disaccharide?
24
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. Compound X was probably
25
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?
26
The component of air that can be removed by alkaline pyrogallol solution is
27
During water treatment for town supply, water is passed through layers of send beds in order to
28
The cleansing action of soap in hard water is not satisfactory because soap
29
What is the role of MnO 2 in the reaction represented by the following equation?MnO 2 + 4HCI 2 + CI 2 + 2H 2 O
30
Nitrogen is prepared on a large scale by the
31
Ammonia gas is suitable for performing the 'Fountain' experiment because the gas is
32
Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?
33
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn (s) + CuSO 4(aq) → ZnSO 4(aq) + Cu (s) [Cu =63,5, Zn = 65]
34
The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are
35
The following are properties of transition metals except
36
The following salts will produce a gas on reacting with hydrochloric acid except
