Question

In the periodic table of the elements, the phrase “middle row anomaly” refers to a) Middle elements of periodic table are transition metals. b) Middle element of each group is unstable. c) the relative instability of bromine oxides compared to the other halogen oxides. d) The higher oxides of halogens tend to be more stable than the lower ones.

What is the coordination number in a square close packed structure in two dimensions? (A) 2 (B) 3 (C) 4 (D) 6

One mole of ethyl acetate on treatment with an excess of \(LiAlH_4\) in dry ether and subsequent acidification produces (a) 1 mole acetic acid + 1 mole ethyl alcohol. (b) 1 mole ethyl alcohol + 1 mole methyl alcohol. (c) 2 moles of ethyl alcohol. (d) 1 mole of 2-butanol.

Consider the figure and mark the correct option. (a) water will move from side (A) to side (B) if a pressure lower than osmotic pressure is applied on piston (B). (b) water will move from side (B) to side (A) if a pressure greater than osmotic , pressure is applied on piston (B). (c) water will move from side (B) to side (A) if a pressure equal to osmotic pressure is applied on piston (B). (d) water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A).

The anomeric carbon in D(+) glucose is – (a) C-1 carbon (b) C-2 carbon (c) C-5 carbon (d) C-6 carbon

Which of the following factors is not responsible for the denaturation of proteins? (a) Heat (b) Charge (c) pH change (d) Organic solvents

The letter ‘D’ in carbohydrates signifies- (a) dextrorotatory (b) configuration (c) diamagnetic nature (d) mode of synthesis